Chinese Journal of Catalysis ›› 2023, Vol. 51: 5-48.DOI: 10.1016/S1872-2067(23)64486-9
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Xiaohan Wanga, Han Tianb,*(), Xu Yub, Lisong Chenc, Xiangzhi Cuia,b,*(), Jianlin Shib
Received:
2023-04-29
Accepted:
2023-07-03
Online:
2023-08-18
Published:
2023-09-11
Contact:
*E-mail: cuixz@mail.sic.ac.cn (X. Cui), tianhan@mail.sic.ac.cn (H. Tian).
About author:
Xiangzhi Cui received her Ph.D. degree in 2009 at Shanghai Institute of Ceramics, Chinese Academy of Sciences, and has been working at the institute since then. Now she is a full professor of the Institute. Her main research interest includes the structural design and synthesis of nanostructured composites, and the electrochemical catalysis for clean energy.Supported by:
Xiaohan Wang, Han Tian, Xu Yu, Lisong Chen, Xiangzhi Cui, Jianlin Shi. Advances and insights in amorphous electrocatalyst towards water splitting[J]. Chinese Journal of Catalysis, 2023, 51: 5-48.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(23)64486-9
Fig. 2. Schematic diagram of the HER mechanism. Reaction path interpretation of generating H2 gas for Volmer-Tafel (1+2+3) and Volmer-Heyrovsky (1+4) routes in acidic media. Reaction path interpretation of generating H2 gas for both Volmer-Tafel (5+6+7) and Volmer-Heyrovsky (5+8) routes in alkaline media.
Fig. 3. (a) Trassati’s volcano plot for the hydrogen evolution reaction in acid solutions. j00 denotes the exchange current density, and EMH the energy of hydride formation. (b) Volcano plots for hydrogen evolution alkaline aqueous solutions. Note that ascending and descending branch are reversed with respect to (a). Reprinted with permission from Ref. [49]. Copyright 2014, Beilstein Institute.
Fig. 4. AEM (a) and LOM (b) plots of OER in acidic and alkaline media. Red color indicates lattice oxygen on the electrode surface and blue color indicates oxide in solution.
Fig. 5. The adsorption energy scaling relations between oxygen-containing intermediates. (a) Plot of adsorption energies of HOO* and HO* on metal oxides. Hollow symbols represent the adsorption energy on the clean surfaces: perovskites (circle), rutiles (triangle), MnxOy (square), anatase (diamond), Co3O4 (+). The solid symbols represent the adsorption energies on high coverage surfaces. (b) The volcano relationship between ΔGO* ? ΔGHO* and OER activity for major oxides. Reproduced with permission from Ref. [50]. Copyright 2022, Springer Nature.
Amorphous metal | Catalyst | Synthetic method | Ref. |
---|---|---|---|
Precious metal | amorphous Pt nanospheres | one-step stirring method | [ |
Pd-Cu-S | chemical dealloying method | [ | |
PdNi-S/C | chemical reduction loading method | [ | |
RuO2-doped Ti/IrO2-ZrO2 | sol-gel method | [ | |
Fe | FeMoPC | electrochemical activation-dealloying | [ |
FeB, FeSiB, FeCoSiB | plunge cooling method | [ | |
CC@FeOOH-NTs-240 °C | template electro-etching method | [ | |
a-Co2Fe | chemical reduction method | [ | |
Co | Co-30Ni-B | chemical reduction method | [ |
Co-Mo-S | hydrothermal method | [ | |
Co2P/CoMoPx-NF | electrodeposition method | [ | |
CoOx(Ce) | electrostatic spray deposition method | [ | |
PA-CoSx(OH)y | etching and sulfurization | [ | |
Ni | NiP/Poplar | electroless plating method | [ |
Ni-OH/P | chemical reduction loading method | [ | |
NiFe(OH)x/CP | electrochemical deposition method | [ | |
Mo | a-MoSx | aging approach | [ |
MoS3/MWCNT-NC | wet chemistry method | [ | |
N-doped a-MoSx | chemical reduction method | [ | |
Other | WP/Ti | chemical reduction method | [ |
Cu-A-TiO2 | alternating pulse deposition method | [ | |
TaOx/Ti | thermal decomposition method | [ |
Table 1 Synthetic methods for amorphous electrocatalysts.
Amorphous metal | Catalyst | Synthetic method | Ref. |
---|---|---|---|
Precious metal | amorphous Pt nanospheres | one-step stirring method | [ |
Pd-Cu-S | chemical dealloying method | [ | |
PdNi-S/C | chemical reduction loading method | [ | |
RuO2-doped Ti/IrO2-ZrO2 | sol-gel method | [ | |
Fe | FeMoPC | electrochemical activation-dealloying | [ |
FeB, FeSiB, FeCoSiB | plunge cooling method | [ | |
CC@FeOOH-NTs-240 °C | template electro-etching method | [ | |
a-Co2Fe | chemical reduction method | [ | |
Co | Co-30Ni-B | chemical reduction method | [ |
Co-Mo-S | hydrothermal method | [ | |
Co2P/CoMoPx-NF | electrodeposition method | [ | |
CoOx(Ce) | electrostatic spray deposition method | [ | |
PA-CoSx(OH)y | etching and sulfurization | [ | |
Ni | NiP/Poplar | electroless plating method | [ |
Ni-OH/P | chemical reduction loading method | [ | |
NiFe(OH)x/CP | electrochemical deposition method | [ | |
Mo | a-MoSx | aging approach | [ |
MoS3/MWCNT-NC | wet chemistry method | [ | |
N-doped a-MoSx | chemical reduction method | [ | |
Other | WP/Ti | chemical reduction method | [ |
Cu-A-TiO2 | alternating pulse deposition method | [ | |
TaOx/Ti | thermal decomposition method | [ |
Fig. 7. (a) Schematic illustration of synthesis process for amorphous cobalt boron alloy (a-CoBx). SEM (b), TEM (c), HAADF-TEM (d) images, elemental mapping (e,f), HRTEM (g) and SAEM (h) images of a-CoBx. Reproduced with permission from Ref. [84]. Copyright 2020, Royal Society of Chemistry.
Fig. 8. (a) Schematic illustration of synthesis process for amorphous Ni-B hollow spheres. SEM (b,d,f) and TEM (c,e,g) micrographs of the polystyrene microspheres before and after Ni-B deposition. Reproduced with permission from Ref. [86]. Copyright 2005, Royal Society of Chemistry.
Fig. 9. Mechanical and self-healing properties of copolymers with different E (ethylene), AHexP (hexylanisyl propylene), and ANaphP (methoxynaphthyl propylene) contents. (a) Glass transition temperature (Tg) versus ANaphP content. (b) Stress-strain curves of copolymers with different AHexP/ANaphP/E ratios. (c) Self-healing tests of terpolymer P1 in air at 25 °C. (d) Self-healing tests of terpolymer P4 in air at 25 °C. The AHexP/ANaphP ratio in the terpolymers could be adjusted by changing the initial monomer feed ratio, affording a series of three-component copolymers with different AHexP/ANaphP/E ratios (P1: 21/19/60, P2: 31/10/59, P3: 11/28/61) and similar molecular weights (P1: Mn = 165 × 103 g mol?1, P2: Mn = 151 × 103 g mol?1, P3: Mn = 124 × 103 g mol?1). Reproduced with permission from Ref. [97]. Copyright 2021, John Wiley and Sons.
P | Mn (103) | [AHexP]/[ANaphP]/[E](mol%) | Tg (°C) |
---|---|---|---|
PEH | 164 | 36/0/64 | ‒31 |
PEN | 115 | 0/41/59 | 52 |
PEH + PEN | — | — | ‒28,50 |
P1 | 165 | 21/19/60 | 0 |
P2 | 151 | 31/10/59 | ‒13 |
P3 | 124 | 11/28/61 | 25 |
Table 2 Summary of glass transition temperatures (Tg) of copolymers with different monomer contents. Reproduced with permission from Ref. [97]. Copyright 2021, John Wiley and Sons.
P | Mn (103) | [AHexP]/[ANaphP]/[E](mol%) | Tg (°C) |
---|---|---|---|
PEH | 164 | 36/0/64 | ‒31 |
PEN | 115 | 0/41/59 | 52 |
PEH + PEN | — | — | ‒28,50 |
P1 | 165 | 21/19/60 | 0 |
P2 | 151 | 31/10/59 | ‒13 |
P3 | 124 | 11/28/61 | 25 |
Fig. 10. Polarization curves of different catalysts in 0.5 mol L?1 H2SO4 (a), 1.0 mol L?1 PBS (b) and 1.0 mol L?1 KOH (c). (d) Chronopotential curves obtained over Pt-Pd@NPA at a low current density of 10 mA cm?2 for 50 h (red curve) and at high current density of 1000 mA cm?2 over 100 h without IR correction. Inset: the polarization curves of the Pt-Pd@NPA and Pt/C catalysts, initially and after 10000 CV cycles ranging from 200 to ?200 mV vs. RHE at 100 mV s?1. All the current densities are normalized with the electrode's geometric surface area. (e) TOF values of Pd@NPA and Pt-Pd@NPA compared with both precious and non-precious-based representative catalysts in acidic solution. (f) Top view atomic structure models of Ag (111), Pt (111), Pd (111), Pd@Ag (111), Pt@Ag (111) and Pt-Pd@Ag (111) with H*. (g) Free-energy diagram for hydrogen evolution at equilibrium (U = 0). (h) Volcano plots of j0 as a function of the ?G*H for the as-synthesized Pt-Pd@NPA, Pd@NPA, and common metal catalysts. Reproduced with permission from Ref. [104]. Copyright 2018, Royal Society of Chemistry.
Electrocatalyst | Overpotential (mV) at 10 mA cm‒2 | Tafel slope (mV dec‒1) | Ref. |
---|---|---|---|
AC-Ir NSs | 17 | 27 | [ |
Ir@CON | 13.4 | 27 | [ |
IrCo-PHNC | 21 | 26.6 | [ |
Ru@C2N | 22 | 30 | [ |
Pd/Cu-Pt | 22.8 | 25 | [ |
RhP2@PNC | 38 | 38 | [ |
Rh-MoS2 | 47 | 24 | [ |
Ru-MoO2 | 55 | 44 | [ |
Pt@NHPCP | 57 | 27 | [ |
Rh/Si NW | 80 | 24 | [ |
Pt ML Ag NF/Ni foam | 70 | 53 | [ |
Pt-MoS2 | 53 | 40 | [ |
Table 3 Summary of some recently reported amorphous HER electrocatalysts in acidic electrolytes. Reproduced with permission from Ref. [106]. Copyright 2022, Springer Nature.
Electrocatalyst | Overpotential (mV) at 10 mA cm‒2 | Tafel slope (mV dec‒1) | Ref. |
---|---|---|---|
AC-Ir NSs | 17 | 27 | [ |
Ir@CON | 13.4 | 27 | [ |
IrCo-PHNC | 21 | 26.6 | [ |
Ru@C2N | 22 | 30 | [ |
Pd/Cu-Pt | 22.8 | 25 | [ |
RhP2@PNC | 38 | 38 | [ |
Rh-MoS2 | 47 | 24 | [ |
Ru-MoO2 | 55 | 44 | [ |
Pt@NHPCP | 57 | 27 | [ |
Rh/Si NW | 80 | 24 | [ |
Pt ML Ag NF/Ni foam | 70 | 53 | [ |
Pt-MoS2 | 53 | 40 | [ |
Fig. 11. (a) The schematic illustration of the FeP/FeOx structure. (b) Adsorption energy of water on FeP and FeP/FeO interface. (c) The ΔGH* diagrams for the FeP/FeO interface. (d) Minimum-energy paths for water dissociation on FeP and FeP/FeO interface with structures for initial state (IS), transition state (TS) and final state (FS). Reproduced with permission from Ref. [124]. Copyright 2018, Royal Society of Chemistry.
Fig. 12. (a?d) Charge density difference of CoSe2, CoP, orthorhombic crystalline CoSe2/crystalline CoP heterojunction (CoSe2/c-CoP), and orthorhombic crystalline CoSe2/amorphous CoP heterojunction (CoSe2/a-CoP). The purple, grey-green, and brown spheres denote Co, Se, and P atoms, respectively. The yellow and cyan contours represent charge accumulation and dilution, respectively. (e) ΔGH on different sites of CoSe2, CoP, CoSe2/c-CoP, and CoSe2/a-CoP. (f) The reaction pathway of the HER process. (g) Projected DOS of CoSe2/a-CoP. (h) DOS of the Co 3d band. The vertical lines mark the positions of d-band center. Reproduced with permission from Ref. [125]. Copyright 2022, John Wiley and Sons.
Fig. 13. Structure models and hydrogen adsorption free energies at different sites of [Mo3S13]2?, [Mo6S24]2? clusters and at the [Mo3S13]/Ni3S2 interface. (a) Structure models. (b,c) The diagrams for hydrogen adsorbed at different sites of the clusters, composite and 2H MoS2 slab. Electrochemical results of the a-MoSx-Ni3S2 composite. (d,e) Different-current range LSV curves. (f) Tafel plots of the as-prepared a-MoSx-Ni3S2, Ni3S2/NF, MoS2/NF and NF in 1 mol L?1 KOH. Reproduced with permission from Ref. [133]. Copyright 2019, Royal Society of Chemistry.
Fig. 14. Polarization curves (a) and the corresponding Tafel plots (b), electrochemical impedance spectra (c), electrochemical capacitance calculated from CV (d), TOF value (e) of typical a-MoSx and Sbr-MoSx with bridging S contents in the range from 51% to 67%; (f) HER activity of 67% Sbr-MoSx before and after cycling test. Reproduced with permission from Ref. [77]. Copyright 2019, Elsevier. Polarization curves (g) and the corresponding Tafel plots (h). (i) Electrochemical impedance spectra of MoSx/NCNT and bare MoSx at ?0.2 V versus RHE from 5 MHz to 10 mHz. Reproduced with permission from Ref. [137]. Copyright 2014, American Chemical Society.
Fig. 15. Electrochemical tests in 1 mol L?1 KOH solution. IR-corrected polarization curves (a) and Tafel plots (b) of Cu-A-TiO2, M-TiO2, CuO NW/CF, 20% Pt/C, and CF at 2 mV s?1. (c) Polarization curves for the Cu-A-TiO2 before and after 5000 CV cycles. The inset in panel (c) shows stability testing of Cu-A-TiO2 by chronopotentiometry at static current densities of 10 and 50 mA cm?2. (d) Water adsorption free energy (ΔGH2O), water dissociation energy barrier (ΔGW), and hydrogen adsorption free energy (ΔGH*) on M-TiO2 (001), A-TiO2, and Cu-A-TiO2. Partial electronic density of states (PDOS) of O 2p (e) and total electronic density of states (TDOS) (f) calculated for M-TiO2, A-TiO2, and Cu-A-TiO2. The Fermi level is set at 0 eV. Reproduced with permission from Ref. [81]. Copyright 2020, American Chemical Society. (g,h) Polarization curves of CoW(OH)x, Co(OH)x, and W(OH)x, along with Pt/C and blank Ni foam for comparison. (i) Stability test of CoW(OH)x at the current density of ?20 mA cm?2. Reproduced with permission from Ref. [138]. Copyright 2018, American Chemical Society.
Fig. 17. (a) Schematic diagram of the electronic activity enhancement in amorphous structure. (b) Local structural configurations of initial reactant, intermediates or final product on the amorphous RuTe2 surface. (c) Schematic illustration of the OER process under acidic and alkaline conditions. (d) The free energetic pathways for acidic OER at U = 0 V. (e) The alkaline OER pathway at U = 0 V. (f) The OER pathways of acidic and alkaline conditions at U = 1.23 V. Reproduced with permission from Ref. [151]. Copyright 2019, Springer Nature.
Electrocatalyst | Overpotential (mV) at 10 mA cm‒2 | Tafel slope (mV dec‒1) | Ref. |
---|---|---|---|
SnCoFe-Ar | 300 | 42.3 | [ |
NCoM-SS-Ar | 340 | 51 | [ |
Ni1.5Sn@triMPO4-R | 240 | 45.2 | [ |
CeOx/CoOx | 313 | 66 | [ |
NiO/CoN PINWs | 300 | 44.5 | [ |
Mo51Ni40Fe9 NBs | 257 | 51 | [ |
Ni/Ni(OH)2 | 270 | 53 | [ |
Co3O4/CeO2 | 270 | 60 | [ |
W2N/WC | 320 | 122.8 | [ |
LaNiO3 | 189 | 36 | [ |
Ru/CoFe-LDHs | 197 | 39 | [ |
e-ICLDH@GDY | 216 | 43.6 | [ |
CoP-MNA | 290 | 65 | [ |
Fe-Mn-O NSs/CC | 273 | 63.9 | [ |
F/BCN | 222 | 87 | [ |
FeOOH(Se)/IF | 287 | 54 | [ |
CoxMoy@NC | 330 | 46.1 | [ |
Ir/CoNiB | 178 | 35.1 | [ |
Table 4 Comparison of OER activity in 1 mol L?1 KOH for various amorphous electrocatalyts. Reproduced with permission from Ref. [154]. Copyright 2021, John Wiley and Sons.
Electrocatalyst | Overpotential (mV) at 10 mA cm‒2 | Tafel slope (mV dec‒1) | Ref. |
---|---|---|---|
SnCoFe-Ar | 300 | 42.3 | [ |
NCoM-SS-Ar | 340 | 51 | [ |
Ni1.5Sn@triMPO4-R | 240 | 45.2 | [ |
CeOx/CoOx | 313 | 66 | [ |
NiO/CoN PINWs | 300 | 44.5 | [ |
Mo51Ni40Fe9 NBs | 257 | 51 | [ |
Ni/Ni(OH)2 | 270 | 53 | [ |
Co3O4/CeO2 | 270 | 60 | [ |
W2N/WC | 320 | 122.8 | [ |
LaNiO3 | 189 | 36 | [ |
Ru/CoFe-LDHs | 197 | 39 | [ |
e-ICLDH@GDY | 216 | 43.6 | [ |
CoP-MNA | 290 | 65 | [ |
Fe-Mn-O NSs/CC | 273 | 63.9 | [ |
F/BCN | 222 | 87 | [ |
FeOOH(Se)/IF | 287 | 54 | [ |
CoxMoy@NC | 330 | 46.1 | [ |
Ir/CoNiB | 178 | 35.1 | [ |
Fig. 18. Polarization curves (a,b) and the corresponding Tafel plots (c) of various catalysts in 1 mol L?1 KOH solution. Reproduced with permission from Ref. [181]. Copyright 2018, Elsevier. (d) The surface distribution of OH- concentration of NiFe-ANR with different scales. (e) The distribution of OH- in the internal channels of NiFe-ANR. (f) The surface distribution of OH- concentration of NiFe-ANNR with different scales. (g) The current density distribution on the surface of NiFe-ANR with different scales. (h) The current density distribution in the internal channels of NiFe-ANR. (i) The current density distribution on the surface of NiFe-ANNR with different scales. Reproduced with permission from Ref. [184]. Copyright 2023, John Wiley and Sons.
Fig. 19. (a) SEM images of CoOx(Ce). Polarization curves (b) and Tafel slopes (c) of CoOx(Ce), CoOx, and RuO2. (d) Current-time curve of CoOx(Ce) recorded in a potentiostatic electrolysis experiment. Inset of (d) shows the LSV curves measured before and after a potentiostatic electrolysis experiment. (e) Comparison of theoretical and detected volume of oxygen generated from a potentiostatic electrolysis. All potentials are corrected with IR drop. EIS spectra (f), Cdl (g), JECSA (h), and Arrhenius plots (i) of CoOx(Ce) and CoOx. All measurements were carried out in 1 mol L?1 KOH solution. Reproduced with permission from Ref. [72]. Copyright 2019, Royal Society of Chemistry.
Fig. 20. Electrochemical performance in the OER. (a) Cyclic voltammograms of Zn;NiFeOxHy. Only the curves obtained at the 1st (purple line), 2nd (blue line), 10th (green line), 50th (yellow line), 100th (orange line), and 150th (red line) scans are shown. The inset exhibits the magnified CVs for the initial and final cycles. The arrow denotes the voltammograms for the forward scan. (b) CV of Zn, NiFeOxHy, and Ni foil. Chronoamperometry curves of various catalysts at a specific potential (c), where the initial current density is 10 mA cm?2 and the corresponding Tafel plots (d). Reproduced with permission from Ref. [204]. Copyright 2020, American Chemical Society. (e) OER polarization curves of NiFe/Ni, NiFeIr0.02/Ni, NiFeIr0.03/Ni, and NiFeIr0.05/Ni NW@NSs catalysts. (f) Required overpotentials at current densities of 10.0 and 100 mA cm?2. (g) Schematic illustration of the OER process for the NiFeIrx/Ni model. Ni* at the NiFeIrx/Ni model is the active site. (h) Gibbs free energy diagram of the OER process on Ni active site for NiFe/Ni and NiFeIrx/Ni models at U = 0 V, pH = 14, and 0 °C. Reproduced with permission from Ref. [205]. Copyright 2020, American Chemical Society.
Fig. 21. Polarization curves (a) and the corresponding Tafel plots (b) of different electrodes. (c) Current density vs time (i-t) curves of Mo-FeS NSs at 1.45 and 1.55 V vs. RHE, respectively, and LSV curves before and after 1000 cycles (inset). Free energy diagram of three simulated models at U = 0, FeS (d), Mo-FeS NPs (e) and Mo-FeS NSs (f). The blue, red, purple, green, and orange balls denote S, Fe, Mo, O, and H, respectively. Projected DOS of pristine FeS (g), Mo-FeS-NPs (h), and Mo-FeS-NSs (i) (the Fermi level is set to zero). Reproduced with permission from Ref. [213]. Copyright 2020, American Chemical Society.
Fig. 22. (a) Free energies of Co2+ → Co3+ → Co4+ evolution in various Co-Fe-Cr (oxy)hydroxides. (b) Theoretical OER volcano plot. (c) Optimized β-CoOOH (101-4) models considered for DFT calculations. Red, white, blue, brown, and teal spheres represent O, H, Co, Fe, and Cr atoms, respectively. OER catalytic performance atlases of CoaFebCrc (oxy)hydroxides measured in 1 mol L?1 KOH electrolyte based on η10 (d), Tafel slope (e), and TOF (f) at the η of 300 mV. Reproduced with permission from Ref. [219]. Copyright 2021, John Wiley and Sons.
Fig. 24. DFT calculations. Schematic illustration of the proposed OER mechanism (a,b) and Gibbs free energy diagram (c,d) for Ru (a,c) and Ru-O (b,d) sites on Ru1/D-NiFe LDH. The lavender box step is the rate-determining step. Reproduced with permission from Ref. [223]. Copyright 2021, Springer Nature.
Catalyst | Cell Voltage (V) | Ref. |
---|---|---|
RuIrOx | 1.47 | [ |
Ni-Fe NPs | 1.47 | [ |
CoMoNiS-NF | 1.54 | [ |
R-NiCo2O4 | 1.61 | [ |
CoP/NCNHP | 1.64 | [ |
CoMnO@CN | 1.5 | [ |
RuCu NSs | 1.49 | [ |
Co/β-Mo2C@N-CNTs | 1.64 | [ |
VOOH/NF | 1.62 | [ |
Co3O4-MTA | 1.63 | [ |
Cu@NiFe LDH | 1.54 | [ |
EG/Co0.85Se/NiFe LDH | 1.67 | [ |
MoO3/Ni-NiO | 1.55 | [ |
Ni/Ni(OH)2 | 1.59 | [ |
W2N/WC | 1.58 | [ |
Cr-doped FeNi-P/NCN | 1.50 | [ |
δ-FeOOH NSs/NF | 1.62 | [ |
CoSx@Cu2MoS4-MoS2/NSG | 1.6 | [ |
Ni-ZIF/Ni-B | 1.54 | [ |
Mo-Co9S8@C | 1.56 | [ |
Co@N-CS/N-HCP | 1.545 | [ |
NiFe LDH@NiCoP | 1.57 | [ |
sNiCoP/NF | 1.58 | [ |
CoFe@NiFe LDH | 1.59 | [ |
S-CoOx | 1.63 | [ |
Zn1-xFex-LDH | 1.62 | [ |
NiCoFeB | 1.81 | [ |
Ru1/D-NiFe LDH | 1.44 | [ |
Table 5 Comparison of overall water splitting data for various catalysts. Reproduced with permission from Ref. [223]. Copyright 2021, Springer Nature.
Catalyst | Cell Voltage (V) | Ref. |
---|---|---|
RuIrOx | 1.47 | [ |
Ni-Fe NPs | 1.47 | [ |
CoMoNiS-NF | 1.54 | [ |
R-NiCo2O4 | 1.61 | [ |
CoP/NCNHP | 1.64 | [ |
CoMnO@CN | 1.5 | [ |
RuCu NSs | 1.49 | [ |
Co/β-Mo2C@N-CNTs | 1.64 | [ |
VOOH/NF | 1.62 | [ |
Co3O4-MTA | 1.63 | [ |
Cu@NiFe LDH | 1.54 | [ |
EG/Co0.85Se/NiFe LDH | 1.67 | [ |
MoO3/Ni-NiO | 1.55 | [ |
Ni/Ni(OH)2 | 1.59 | [ |
W2N/WC | 1.58 | [ |
Cr-doped FeNi-P/NCN | 1.50 | [ |
δ-FeOOH NSs/NF | 1.62 | [ |
CoSx@Cu2MoS4-MoS2/NSG | 1.6 | [ |
Ni-ZIF/Ni-B | 1.54 | [ |
Mo-Co9S8@C | 1.56 | [ |
Co@N-CS/N-HCP | 1.545 | [ |
NiFe LDH@NiCoP | 1.57 | [ |
sNiCoP/NF | 1.58 | [ |
CoFe@NiFe LDH | 1.59 | [ |
S-CoOx | 1.63 | [ |
Zn1-xFex-LDH | 1.62 | [ |
NiCoFeB | 1.81 | [ |
Ru1/D-NiFe LDH | 1.44 | [ |
Fig. 25. (a) Schematic illustration of FeS/IF as a pre-catalyst for generating active electrocatalysts for both HER and OER. (b) Measurement of adhesive forces of hydrogen bubbles with Fe-H2cat. (c) The contact angle of hydrogen bubbles with Fe-H2cat in 1 mol L?1 KOH solution. (d) Schematic illustration of the enhanced HER activity in the presence of Fe-H2cat. Possible H* adsorption sites on the O-covered Fe (111) slab (e) and the O/S-covered Fe (111) slab (f). All of the top sites (indicated by the element symbol) and top-shallow bridge sites (denoted as “b”) on the surfaces are considered. (g) Calculated free-energy diagram of HER at the equilibrium potential for Pt (111), FeS (001), O-covered Fe (111), and O/S-covered Fe (111) surfaces. Reproduced with permission from Ref. [257]. Copyright 2018, Elsevier.
Fig. 26. (a) Panoramic SEM images of GA. (b) Schematic illustration of a rechargeable Zn-air battery. (c) Scheme of the structure characterization of the self-driven OWS device. (d) The open-circuit plots for zinc-air battery performance of CoNx/NGA acting as the air cathode in comparison with the noble metal RuO2 + Pt/C catalyst. (e) Charging and discharging polarization curves. (f) Energy density plots at 50 mA cm?2. (g) Long-term cycling performance at 10 mA cm?2. (h) Oxygen and hydrogen evolution rates in the integrated device. Reproduced with permission from Ref. [261]. Copyright 2019, Elsevier.
Fig. 27. Theoretical insights of amorphous-crystalline coupling and d/p-band center regulation. (a) Schematic illustration of amorphous-crystalline heterostructure for promoting d/p-band center regulation. (b) CoBOx/NiSe heterostructure model. DOS of (c) NiSe and CoBOx, and (d) CoBOx/NiSe. (e) Planar average potential in CoBOx/NiSe along Z direction. d-p orbital level of surface atoms (f) and d-p band center difference (Δ?d-p) values (g) in CoBOx and CoBOx/NiSe. Reproduced with permission from Ref. [271]. Copyright 2023, John Wiley and Sons.
Fig. 28. (a) The k3-weighted R-space FT spectra for Co K-edge EXAFS of CoMoSx, CoS and Co foil. (b) The k2-weighted R-space FT spectra for Mo K-edge EXAFS of CoMoSx, MoS2 and Mo foil. EXAFS fitting in R space for CoMoSx in (d) Co K-edge and (e) Mo K-edge. (c) Comparisons between the experimental K-edge XANES spectra of CoMoSx and the theoretical spectra calculated based on CoS6 and CoS5 moieties. Some of the main features reproduced are highlighted at points a?c. (f) Proposed model of CoMoSx, yellow: S, gray: Mo, blue: Co, red: O. Reproduced with permission from Ref. [272]. Copyright 2019, John Wiley and Sons.
Sample | Shell | CN | R (Å) | σ2(×10‒3A2) | R factor |
---|---|---|---|---|---|
CoS2 | Co-S | 6 | 2.31 | — | — |
CoMoSx | Co-S | 4.7 | 2.31 | 6.9 | 1.86% |
(NH4)2Mo3S13·2H2O | Mo-S | 7 | 2.43 | 4.6 | 0.04% |
Mo-Mo | 2 | 2.75 | 2.9 | ||
MoS2 | Mo-S | 6 | 2.41 | — | — |
CoMoSx | Mo-O | 2.0 | 2.22 | 6.8 | 1.99% |
Mo-S | 5.0 | 2.34 | 8.9 | ||
Mo-Mo | 1.9 | 2.73 | 9.6 |
Table 6 Structural parameters extracted from the Co K-edge EXAFS fitting of CoMoSx. (CN is the coordination number with an error of 20%; R is the bond length between central atoms and surrounding coordination atoms; σ2 is Debye-Waller factor (a measure of thermal and static disorder in absorber-scatterer distances); R factor is used to value the goodness of the fitting. Reproduced with permission from Ref. [272]. Copyright 2019, John Wiley and Sons.)
Sample | Shell | CN | R (Å) | σ2(×10‒3A2) | R factor |
---|---|---|---|---|---|
CoS2 | Co-S | 6 | 2.31 | — | — |
CoMoSx | Co-S | 4.7 | 2.31 | 6.9 | 1.86% |
(NH4)2Mo3S13·2H2O | Mo-S | 7 | 2.43 | 4.6 | 0.04% |
Mo-Mo | 2 | 2.75 | 2.9 | ||
MoS2 | Mo-S | 6 | 2.41 | — | — |
CoMoSx | Mo-O | 2.0 | 2.22 | 6.8 | 1.99% |
Mo-S | 5.0 | 2.34 | 8.9 | ||
Mo-Mo | 1.9 | 2.73 | 9.6 |
Fig. 29. Electrocatalytic performances for OWS in 1 mol L?1 KOH. (a) OWS LSV curves. (b) Comparison of the cell voltages at a current density of 100 mA cm?2 for OWS. (c) Constant current electrolysis at a current density of 20 mA cm?2 using FeOOH/Cr-NiCo2O4/NF as both cathode and anode. Reproduced with permission from Ref. [275]. Copyright 2020, Springer Nature. (d) LSV curves of RuCu NSs/C, RuCu NPs/C and Ir/C||Pt/C for OWS in 1 mol L?1 KOH, 0.1 mol L?1 KOH, 0.5 mol L?1 H2SO4 and 0.05 mol L?1 H2SO4, respectively. Potentials (e) and Tafel slopes (g) of RuCu NSs/C, RuCu NPs/C and Ir/C||Pt/C in different electrolytes calculated from corresponding polarization curves. (f) Chronopotentiometry tests of RuCu NSs/C, RuCu NPs/C and Ir/C||Pt/C in 1 mol L?1 KOH at 10 mA cm?2. Reproduced with permission from Ref. [234]. Copyright 2019, John Wiley and Sons.
Fig. 31. In-situ Raman spectra of Ni9S8/Ni3S2/NF-20 (a) and Ni3S2/NF-5 (b) in 1.0 mol L?1 KOH as a function of different potentials. Reproduced with permission from Ref. [280]. Copyright 2023, John Wiley and Sons. (c) Algorithm framework of SOAP-ML model construction. Reproduced with permission from Ref. [284]. Copyright 2022, Royal Society of Chemistry.
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