Chinese Journal of Catalysis ›› 2023, Vol. 48: 66-89.DOI: 10.1016/S1872-2067(23)64428-6
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Yanchang Liua, Xinlong Tianb, Ye-Chuang Hanc,*(), Yanan Chena,*(
), Wenbin Hua
Received:
2022-12-03
Accepted:
2023-02-28
Online:
2023-05-18
Published:
2023-04-20
Contact:
* E-mail: About author:
Ye-Chuang Han (Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province, Xiamen University). Dr. Ye-Chuang Han received his B.A. degree from Nanchang Hangkong University in 2015, and his M.S. degree from University of Science and Technology of China in 2018, and his Ph.D. degree from Xiamen University in 2022. Now, he is carrying out his postdoctoral research at Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM) and Xiamen University under the supervision of Prof. Zhong-Qun Tian. His research interests mainly focus on the synthetic methodology under non-equilibrium high temperature.Supported by:
Yanchang Liu, Xinlong Tian, Ye-Chuang Han, Yanan Chen, Wenbin Hu. High-temperature shock synthesis of high-entropy-alloy nanoparticles for catalysis[J]. Chinese Journal of Catalysis, 2023, 48: 66-89.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(23)64428-6
Fig. 1. (a) Temperature-time curve for traditional near-equilibrium heating. (b) Kinetic and thermodynamic products possess different total free energies. (c) Temperature variation during HTS treatment. (d) Timeline for the development of Joule heating and laser heating. (b) Reproduced with permission [5]. Copyright 2021, American Chemical Society. (d) Reproduced with permission [8]. Copyright 2016, The Authors. Reproduced with permission [23]. Copyright 2018, American Association for the Advancement of Science. Reproduced with permission [30]. Copyright 2022, Springer Nature. Reproduced with permission [31]. Copyright 2021, American Chemical Society. Reproduced with permission [107]. Copyright 2022, Springer Nature.
Fig. 2. (a) Number of papers on the topic of “high-entropy alloy” (data derived from Web of Science). (b) Mechanism of catalytic reactions. (c) Number and species of active sites in bulk HEAs, conventional alloy NPs, and HEA-NPs.
Fig. 3. Energy-space-time field and temperature variation rate of Joule heating, laser heating, microwave heating, and near-equilibrium heating. (a) Coupling of energy, space, and time to construct a power density that can achieve HTS. (b) Comparison of energy-space-time characteristics of various heating methods. (c) Comparison of temperature variation rate for various heating methods. Smaller space, less time, and more energy result in greater power density and higher temperature variation rate. (c) Reproduced with permission [44]. Copyright 2019, American Chemical Society. Reproduced with permission [9]. Copyright 2020, WILEY‐VCH. Reproduced with permission [45]. Copyright 2019, WILEY‐VCH. Reproduced with permission [46]. Copyright 2022, American Chemical Society.
Fig. 4. Equipment and mechanism of HTS. Schematics of the experimental setup for conducting Joule heating (a), laser heating (c), and microwave heating (e). Mechanisms of Joule heating (b), laser heating (d), and microwave heating (f). (a) Reproduced with permission [8]. Copyright 2016, The Authors. (c) Reproduced with permission [51]. Copyright 2019, The Authors. (d) Reproduced with permission [52]. Copyright 2022, American Association for the Advancement of Science. (e) Reproduced with permission [53]. Copyright 2020, Springer Nature. (f) Reproduced with permission [54]. Copyright 2019, Wiley‐VCH.
Parameter | Joule heating | Laser heating | Microwave heating | Near-equilibrium heating |
---|---|---|---|---|
Heating/cooling rate | 103-105 K s-1 | > 105 K s-1 | 102-104 K s-1 | 0-1 K s-1 |
Peak temperature | 2-3 × 103 K | 2-3 × 103 K | 1-2 × 103 K s-1 | 102 K |
Productivity per batch | mg~g | mg | mg~ several tens g | mg~ several hundreds g |
Size | nm, uniform | nm, uniform | nm, uniform | nm to μm, easy to gather |
Substrate applicability | high | high | low | high |
Cost | low | high | medium | medium |
Energy consumption | low | low | medium | high |
Table 1 Comparison of different heating methods.
Parameter | Joule heating | Laser heating | Microwave heating | Near-equilibrium heating |
---|---|---|---|---|
Heating/cooling rate | 103-105 K s-1 | > 105 K s-1 | 102-104 K s-1 | 0-1 K s-1 |
Peak temperature | 2-3 × 103 K | 2-3 × 103 K | 1-2 × 103 K s-1 | 102 K |
Productivity per batch | mg~g | mg | mg~ several tens g | mg~ several hundreds g |
Size | nm, uniform | nm, uniform | nm, uniform | nm to μm, easy to gather |
Substrate applicability | high | high | low | high |
Cost | low | high | medium | medium |
Energy consumption | low | low | medium | high |
Fig. 5. Comparison of different synthetic methods in terms of temperature, size, productivity per batch, substrate applicability, and energy density. (a) Joule heating; (b) laser heating; (c) microwave heating; (d) near-equilibrium heating.
Fig. 6. (a) Functional relationship between the mixing entropy and the number of elements in equimolar alloys. (b) Comparison of mixing entropy in conventional alloys. (c) Schematic of four core effects of HEAs: high entropy effect in thermodynamics, lattice distortion effect in structure, sluggish diffusion effect in kinetics, and cocktail effect in performance. (c) Reproduced with permission [74]. Copyright 2017, Elsevier.
Reaction | Catalyst | Performance | Stability | Electrolyte | Ref. |
---|---|---|---|---|---|
HER | NiCoFePtRh | 27 mV @10 mA cm-2 | 100% of the initial current density after 85 h | 0.5 mol L-1 H2SO4 | [ |
PtNiFeCoCu | 11 mV @10 mA cm-2 | no obvious negative shift after 10000th CV cycle | 1 mol L-1 KOH | [ | |
FeCoNiCu@Pt | 13.7 mV @10 mA cm-2 | slight fluctuations during 100 h stability test | 1 mol L-1 KOH | [ | |
FeCoNiCuPtIr | 21 mV @10 mA cm-2 | morphology and structure unchanged after 24 h work | 1 mol L-1 KOH | [ | |
OER | CoFeNiMnMoPi | 270 mV @10 mA cm-2 | good stability after 500 CV scans | 1 mol L-1 KOH | [ |
RuNiMoCrFeO | 219 mV @10 mA cm-2 | up to 100 h at 100 mA cm-2 | 0.5 mol L-1 H2SO4 | [ | |
IrRuCoNiCu | 166 mV @10 mA cm-2 | 150 h at 1000 mA cm-2 with negligible change | 1 mol L-1 KOH | [ | |
PtIrCuCrNi | 176 mV @10 mA cm-2 | no obvious potential augmentation after 72 h | 1 mol L-1 KOH | [ | |
ORR | (HfZrLaVCeTiNdGdYPd)O | 0.85 V @E1/2 | maintained 86% of its initial current after 100 h | 0.1 mol L-1 KOH | [ |
PtPdRhFeCoNi | 0.85 V @E1/2 | exhibited excellent stability after 5000 cycles | 0.1 mol L-1 KOH | [ | |
PtPdFeCoNi | 0.92 V @E1/2 | 6 mV negative shifted after 50000 cycles of ADT | 0.1 mol L-1 HClO4 | [ | |
PtPdFeCoNi | 0.85 V @E1/2 | decreased by 29% after operation for 15 h | 1 mol L-1 KOH | [ | |
MOR | PtPdFeCoNi | oxidation peak at 0.856 V and higher mass current density of 951.6 mA mgPt-1 | the current density dropped only by 33% for HEA and 57% for Pt/C after 1500 s | 0.1 mol L-1 HClO4 with 0.5 mol L-1 CH3OH | [ |
CuAuAgPtPd | intense peak at 0.8 V | steady-state after 0.8 V for 1000s, affording a current of 14.7 μA | 0.5 mol L-1 KNO3 with CH3OH | [ | |
NH3 oxidation | PtPdRhRuCe | ~100% conversion and >99% nitrogen oxide selectivity | Over ~30 h | — | [ |
CO oxidation | Pd1@ (CeZrHfTiLa)Ox | onset temperature at ~80 °C and complete CO oxidation at 170 °C | 750 °C for 10 h; textural and structural properties remained unchanged | — | [ |
PtNiMgCuZnCoO | 100% conversion at 155 °C | no loss of catalytic activity at 135 °C even after 40 h | — | [ |
Table 2 Summary of the various catalytic applications of HEAs.
Reaction | Catalyst | Performance | Stability | Electrolyte | Ref. |
---|---|---|---|---|---|
HER | NiCoFePtRh | 27 mV @10 mA cm-2 | 100% of the initial current density after 85 h | 0.5 mol L-1 H2SO4 | [ |
PtNiFeCoCu | 11 mV @10 mA cm-2 | no obvious negative shift after 10000th CV cycle | 1 mol L-1 KOH | [ | |
FeCoNiCu@Pt | 13.7 mV @10 mA cm-2 | slight fluctuations during 100 h stability test | 1 mol L-1 KOH | [ | |
FeCoNiCuPtIr | 21 mV @10 mA cm-2 | morphology and structure unchanged after 24 h work | 1 mol L-1 KOH | [ | |
OER | CoFeNiMnMoPi | 270 mV @10 mA cm-2 | good stability after 500 CV scans | 1 mol L-1 KOH | [ |
RuNiMoCrFeO | 219 mV @10 mA cm-2 | up to 100 h at 100 mA cm-2 | 0.5 mol L-1 H2SO4 | [ | |
IrRuCoNiCu | 166 mV @10 mA cm-2 | 150 h at 1000 mA cm-2 with negligible change | 1 mol L-1 KOH | [ | |
PtIrCuCrNi | 176 mV @10 mA cm-2 | no obvious potential augmentation after 72 h | 1 mol L-1 KOH | [ | |
ORR | (HfZrLaVCeTiNdGdYPd)O | 0.85 V @E1/2 | maintained 86% of its initial current after 100 h | 0.1 mol L-1 KOH | [ |
PtPdRhFeCoNi | 0.85 V @E1/2 | exhibited excellent stability after 5000 cycles | 0.1 mol L-1 KOH | [ | |
PtPdFeCoNi | 0.92 V @E1/2 | 6 mV negative shifted after 50000 cycles of ADT | 0.1 mol L-1 HClO4 | [ | |
PtPdFeCoNi | 0.85 V @E1/2 | decreased by 29% after operation for 15 h | 1 mol L-1 KOH | [ | |
MOR | PtPdFeCoNi | oxidation peak at 0.856 V and higher mass current density of 951.6 mA mgPt-1 | the current density dropped only by 33% for HEA and 57% for Pt/C after 1500 s | 0.1 mol L-1 HClO4 with 0.5 mol L-1 CH3OH | [ |
CuAuAgPtPd | intense peak at 0.8 V | steady-state after 0.8 V for 1000s, affording a current of 14.7 μA | 0.5 mol L-1 KNO3 with CH3OH | [ | |
NH3 oxidation | PtPdRhRuCe | ~100% conversion and >99% nitrogen oxide selectivity | Over ~30 h | — | [ |
CO oxidation | Pd1@ (CeZrHfTiLa)Ox | onset temperature at ~80 °C and complete CO oxidation at 170 °C | 750 °C for 10 h; textural and structural properties remained unchanged | — | [ |
PtNiMgCuZnCoO | 100% conversion at 155 °C | no loss of catalytic activity at 135 °C even after 40 h | — | [ |
Synthesis method | Advantage | Disadvantage | High-entropy composition | Thermal treatment | Ref. |
---|---|---|---|---|---|
Joule heating | complex component without phase separation, general preparation strategy, low cost, rapid heating/cooling rate, and nanoscale particles. | reaction parameters vary; however, careful control is required. | PtPdRhRuCe | 2000 K, 55 ms | [ |
PtPdRhRuIrAuCuFe-CoNiCrMnWMoSn | 1800 K, 50 ms | [ | |||
CoNiRuRhIr | 1500 K, 0.5 s | [ | |||
PtPdAuFeCoNiCuSn | 1100 K, 55 ms-5 min | [ | |||
PtPdFeCoNi | 2000 K, 0.5 s | [ | |||
(MgFeCoNiZn)O | 1273 K, 30 s | [ | |||
(CrMnFeCoNi)S | 1650 K, 55 ms | [ | |||
(MoTaTiWZr)B | 3000 K, 2 min | [ | |||
Laser heating | fastest heating/cooling rate, general preparation strategy, ultrafine and uniform particles. | high cost and high energy may damage the sample surface. | CoCrFeNiAl | 2000 K, 100 ns | [ |
PtPdRhFeCoNi | 5 ns | [ | |||
FeCoNiCuPtIr | ~1550 K, 50-1000 ms | [ | |||
PtIrCuCrNi | 30 min | [ | |||
CoCrFeNiMn | 1273 K, 20 min | [ | |||
CrCoFeNiMnMo | 40 ns | [ | |||
Microwave heating | medium heating rate, flexible operability, and can be integrated into other methods. | the necessity of microwave absorber limits the applications. | CoCrFeNiMo | 1223 K, 20 min | [ |
PtPdFeCoNi | 1850 K, 100 ms | [ | |||
(MgCuNiCoZn)O | at 850 W and 2.45 GHz, 3 min | [ | |||
AuPtPdCu | 343 K, 10 s | [ | |||
Arc melting | mature technical route, significant production, and is currently the most used method. | high energy, time consumption, and high cost. | AlCoCrFeNi | 873-1273 K, 0.5-5 h | [ |
AlCoCrFeTiNi | 300~1500 K | [ | |||
AlMoNbTaTiZr | 1673 K, 26 h | [ | |||
AlMoNbSiTaTiVZr | 973-1073 K, 0.5 h | [ | |||
TiZrNbTa | 1773 K, 5 h | [ | |||
TiVCrZrNbMoHfTaW | 1373 K, 10 h | [ | |||
Mechanical alloying and milling | easy-to-form solid solution with fine grain crystal | easy to be polluted in reaction, high energy consumption. | (NiMgCuZnCo)O | room temperature | [ |
FeCoNiAlTi | > 40 h | [ | |||
Pd1@(CeZrHfTiLa)O | 1173 K | [ | |||
Magnetron sputtering deposition | easy-to-form uniform film structure. | high cost and small quantities. | MoNbTaVW | 500 W, 30 min | [ |
(MoNbTaVW)N | 0.5 Pa, 20 sccm flow rate | [ | |||
Fast-moving bed pyrolysis | simple equipment and easy operation. | different conditions in precursor reduction. | MnCoNiCuRhPdSnIrPtAu | 923 K, 5 s | [ |
FeCoNiCuPdIrPtAu | 923 K, 2 h | [ | |||
Aerosol synthesis | nanoscale uniform particles. | unsatisfactory generalization. | NiCoCuFePt | 1372 K, 3 s | [ |
CoFeNiMnMoPi | 1173 K | [ | |||
PdRuFeNiCuIr | 2000 K, tens of milliseconds | [ |
Table 3 Summary of different synthesis methods and their advantages and disadvantages.
Synthesis method | Advantage | Disadvantage | High-entropy composition | Thermal treatment | Ref. |
---|---|---|---|---|---|
Joule heating | complex component without phase separation, general preparation strategy, low cost, rapid heating/cooling rate, and nanoscale particles. | reaction parameters vary; however, careful control is required. | PtPdRhRuCe | 2000 K, 55 ms | [ |
PtPdRhRuIrAuCuFe-CoNiCrMnWMoSn | 1800 K, 50 ms | [ | |||
CoNiRuRhIr | 1500 K, 0.5 s | [ | |||
PtPdAuFeCoNiCuSn | 1100 K, 55 ms-5 min | [ | |||
PtPdFeCoNi | 2000 K, 0.5 s | [ | |||
(MgFeCoNiZn)O | 1273 K, 30 s | [ | |||
(CrMnFeCoNi)S | 1650 K, 55 ms | [ | |||
(MoTaTiWZr)B | 3000 K, 2 min | [ | |||
Laser heating | fastest heating/cooling rate, general preparation strategy, ultrafine and uniform particles. | high cost and high energy may damage the sample surface. | CoCrFeNiAl | 2000 K, 100 ns | [ |
PtPdRhFeCoNi | 5 ns | [ | |||
FeCoNiCuPtIr | ~1550 K, 50-1000 ms | [ | |||
PtIrCuCrNi | 30 min | [ | |||
CoCrFeNiMn | 1273 K, 20 min | [ | |||
CrCoFeNiMnMo | 40 ns | [ | |||
Microwave heating | medium heating rate, flexible operability, and can be integrated into other methods. | the necessity of microwave absorber limits the applications. | CoCrFeNiMo | 1223 K, 20 min | [ |
PtPdFeCoNi | 1850 K, 100 ms | [ | |||
(MgCuNiCoZn)O | at 850 W and 2.45 GHz, 3 min | [ | |||
AuPtPdCu | 343 K, 10 s | [ | |||
Arc melting | mature technical route, significant production, and is currently the most used method. | high energy, time consumption, and high cost. | AlCoCrFeNi | 873-1273 K, 0.5-5 h | [ |
AlCoCrFeTiNi | 300~1500 K | [ | |||
AlMoNbTaTiZr | 1673 K, 26 h | [ | |||
AlMoNbSiTaTiVZr | 973-1073 K, 0.5 h | [ | |||
TiZrNbTa | 1773 K, 5 h | [ | |||
TiVCrZrNbMoHfTaW | 1373 K, 10 h | [ | |||
Mechanical alloying and milling | easy-to-form solid solution with fine grain crystal | easy to be polluted in reaction, high energy consumption. | (NiMgCuZnCo)O | room temperature | [ |
FeCoNiAlTi | > 40 h | [ | |||
Pd1@(CeZrHfTiLa)O | 1173 K | [ | |||
Magnetron sputtering deposition | easy-to-form uniform film structure. | high cost and small quantities. | MoNbTaVW | 500 W, 30 min | [ |
(MoNbTaVW)N | 0.5 Pa, 20 sccm flow rate | [ | |||
Fast-moving bed pyrolysis | simple equipment and easy operation. | different conditions in precursor reduction. | MnCoNiCuRhPdSnIrPtAu | 923 K, 5 s | [ |
FeCoNiCuPdIrPtAu | 923 K, 2 h | [ | |||
Aerosol synthesis | nanoscale uniform particles. | unsatisfactory generalization. | NiCoCuFePt | 1372 K, 3 s | [ |
CoFeNiMnMoPi | 1173 K | [ | |||
PdRuFeNiCuIr | 2000 K, tens of milliseconds | [ |
Fig. 7. (a) Illustration of the two approaches to perform rapid heating: thermal shock and fast-moving bed. (b) Kinetics dominate the formation of metallic glass, HEAs, and phase-separated structures. (c) New strategies based on high-temperature and high-entropy enable more alloy choices, such as high-entropy design to overcome the immiscibility of Au-X combinations. (d) Elemental maps of HEA-NPs composed of 15 different elements. (e) Schematic of roll-to-toll manufacturing of NPs. (f) Schematic of the HEA-NPs synthesis via an aerosol droplet-mediated technique thermal-treated with Joule heating; Schematic of the high-throughput synthesis of HEA-NPs (g) and fast screening of NPs for catalytic ORR (h). (i) Schematic for the preparation of HEAs@Pt. (a) Reproduced with permission [19]. Copyright 2022, Wiley‐VCH. Reproduced with permission [158]. Copyright 2019, Royal Society of Chemistry. (b) Reproduced with permission [23]. Copyright 2018, American Association for the Advancement of Science. (c) And (d) reproduced with permission [24]. Copyright 2021, Elsevier. (e) Reproduced with permission [158]. Copyright 2019, Royal Society of Chemistry. (f) Reproduced with permission [152]. Copyright 2020, American Chemical Society. (g) and (h) reproduced with permission [109]. Copyright 2020, The Authors. (i) Reproduced with permission [102]. Copyright 2022, The Authors.
Fig. 8. (a) Reaction scheme for ammonia oxidation as well as the structure and performance of HEA-NPs and multimetallic nanoparticles (MMNPs). (b,c) Catalytic performance of PtPdRhRuCe HEA-NPs; 4D-STEM and the selected pattern (d) and strain map (e) of the 15-HEA NPs. CV (f), LSV (g), and stability test (h) of PtPdFeCoNi HEA-NPs. Overpotential (i) and stability test (j) of HEA@Pt. (a-c) Reproduced with permission [23]. Copyright 2018, American Association for the Advancement of Science. (d) and (e) Reproduced with permission [24]. Copyright 2021, Elsevier. (f-h) Reproduced with permission [109]. Copyright 2020, The Authors. (i) and (j) Reproduced with permission [102]. Copyright 2022, The Authors.
Fig. 9. (a) Schematic of the fabrication of HEA-NPs by laser scanning ablation in liquids. (b) Schematic diagram of pulsed laser irradiation manufacturing in mixed salt solutions. (c) The four steps of the laser-induced thermionic emission reduction process for the synthesis of HEA-NPs on carbonaceous supports. (d) The curve of temperature-time during irradiation and the pictures of the laser heating process. (e) Corresponding EDX element mapping images, scale bar is 10 nm. (a) Reproduced with permission [107]. Copyright 2022, Springer Nature. (b) Reproduced with permission [31]. Copyright 2021, American Chemical Society. (c) Reproduced with permission [52] Copyright 2022, American Association for the Advancement of Science. (d) and (e) Reproduced with permission [103]. Copyright 2022, Wiley‐VCH.
Fig. 10. LSV curve of a two-electrode cell assembled by employing PtIrCoNiCr HEA as both cathode and anode for overall water splitting (a) and durability test at 200 mA cm-2 (b). CV curve (c) and stability measurement (d) of CoCrFeNiAl HECs. (e) ORR polarization plots of different HEA-NPs. (f) LSV plots of HER and OER for multi-element alloys. (g) Schematic illustrating the five most stable hollow sites for OH adsorption (red numbers) and five most unstable sites for H adsorption (black numbers). (h) Free-energy diagram of the OER of the hollow sites 1 and 5 for OH adsorption. (a) and (b) Reproduced with permission [107]. Copyright 2022, Springer Nature. (c) and (d) Reproduced with permission [31]. Copyright 2021, American Chemical Society. (e) Reproduced with permission [52] Copyright 2022, American Association for the Advancement of Science. (f-h) Reproduced with permission [103]. Copyright 2022, Wiley‐VCH.
Fig. 11. (a) Thermal treatment of the catalysts supported on carbon fiber cloth by microwave heating. (b) Schematic of microwave heating synthesis in a roll-to-roll process. (c) Schematic of the formation of HEA-NPs on rGO. (d) Temperature profile of the precursor treated by microwave heating. (I) and (II), before and during microwave heating, (III) the temperature color map and (Ⅳ) the corresponding uniform temperature distribution. XRD patterns of porous CoCrFeNiMo HEAs (e) and durability of HEAs catalyst for OER (f). Particle size (g), XRD (h), and EDX mapping (i) of AuPtPdCu HEA-NPs. (a) and (b) Reproduced with permission [171]. Copyright 2021, Wiley‐VCH. (c) and (d) Reproduced with permission [155]. Copyright 2021, American Chemical Society. (e) and (f) Reproduced with permission [28]. Copyright 2021, Elsevier. (g), (h) and (i) Reproduced with permission [157]. Copyright 2021, Springer Nature.
Fig. 12. Electrocatalytic performance of HEA-NPs. LSV curves (a), comparisons of overpotentials (b), and stability test (c) of PtRhCoNiCu/CC for HER. LSV curves (d), comparisons of overpotentials (e), and stability test (f) of IrRuCoNiCu/CC for OER. LSV curves (g) and chronopotentiometric curves (h) for water-splitting reaction. Reproduced with permission [106]. Copyright 2022, FJIRSM CAS, Fuzhou.
Fig. 13. (a) Synthesis of single-phase MEO-NPs based on temperature-driven, oxidation driven, and entropy-driven strategies. (b) The low-entropy catalysts prepared by near-equilibrium heating suffer from detachment and agglomeration, whereas the HTS high-entropy catalysts maintain good stability. (c) Schematics of the preparation of high entropy borides and the Joule heating method fills the temperature gap between the conventional furnace and arc melting methods. Schematics demonstrating the fabrication and structure (d), and particle size (e) of the HES-NPs. LSV curves (f) and schematic (g) of the constructed HES-NPs model by considering cationic Co centers as active sites. (h) OER and ORR LSV curves of HEMG-NPs ((CrCoFeNi)x is not marked). (a) Reproduced with permission [159]. Copyright 2021, Springer Nature. (b) Reproduced with permission [25]. Copyright 2021, Wiley‐VCH. (c) Reproduced with permission [154]. Copyright 2022, American Association for the Advancement of Science. (d), (e), (f) and (g) Reproduced with permission [27]. Copyright 2020, Wiley‐VCH. (h) Reproduced with permission [127]. Copyright 2021, The Authors.
Fig. 14. CH4 conversion (a) and catalytic stability (b) of 10-MEO-PdO. LSV curves (c) and chemical stability (d) of 10-HEO-NPs. LSV curves (e) and OER stability test (f) of (MnFeCoNiZn)O. (g) Two-dimensional map of the calculated overpotentials at Fe, Co, and Ni sites by DFT simulation. LSV polarization curves (h) and chronopotentiometric curves (i) of RuNiMoCrFeOx. (a) and (b) Reproduced with permission [159]. Copyright 2021, Springer Nature. (c) and (d) Reproduced with permission [25]. Copyright 2021, Wiley‐VCH. (e-g) Reproduced with permission [73]. Copyright 2022, American Chemical Society. (h) and (i) Reproduced with permission [105]. Copyright 2022, The Royal Society of Chemistry.
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