A trace of Pt can significantly boost RuO2 for acidic water splitting

doi:10.1016/S1872-2067(21)63952-9

Abstract

Abstract:

The development of highly potential electrocatalysts for acidic water electrolysis is particularly desirable for many energy-related processes. Herein, we demonstrated a versatile strategy to activate and stabilize RuO₂-based electrocatalyst for acidic water splitting by a trace of Pt, where Pt plays an essential role in promoting oxygen evolution reaction (OER), and can simultaneously act as the active site for hydrogen evolution reaction (HER). Compared with pure Ru oxide nanosheet assemblies (Ru ONAs), the “5%Pt-containing” Ru ONAs (5%Pt-Ru ONAs) achieve much enhanced OER activity in 0.5 and 0.05 mol/L H₂SO₄, with much lower overpotentials of 227 and 234 mV at 10 mA cm^‒2, respectively. Experimental and theoretical analyses reveal that the atomically dispersed Pt incorporating into RuO₂ lattice is conducive to increasing the concentration of O vacancies, which effectively enhances the interaction with reaction intermediate and thus lowers the energy barrier for the formation of OOH*. Moreover, benefited from the presence of Pt, the formation of RuO₂ is more achievable when proper annealing is applied. In addition to OER, due to the presence of active Pt, the HER performance of 5%Pt-Ru ONAs can also be ensured, thereby realizing efficient acidic overall water splitting. Finally, the excellent activity can also be achieved without sacrificing stability. This work highlights an attractive strategy for designing active and stable RuO₂-based electrocatalysts for acidic overall water splitting.

Key words: Ruthenium, Platinum, Oxygen vacancy, Acidic, Water splitting

Qing Yao, Jiabo Le, Shize Yang, Jun Cheng, Qi Shao, Xiaoqing Huang. A trace of Pt can significantly boost RuO₂ for acidic water splitting[J]. Chinese Journal of Catalysis, 2022, 43(6): 1493-1501.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(21)63952-9

https://www.cjcatal.com/EN/Y2022/V43/I6/1493

Figures/Tables 5

Fig. 1. TEM image (a) and EDX spectrum (b) of 5%Pt-Ru NAs; TEM image (c), XRD (d), HRTEM image (e), HAADF-STEM-EDX elemental mappings (f) and AC-HAADF-STEM image (g) of 5%Pt-Ru ONAs/C.

Fig. 2. OER LSV curves of Ru ONAs/C, 2%Pt-Ru ONAs/C, 5%Pt-Ru ONAs/C, 10%Pt-Ru ONAs/C and Ir/C in 0.5 mol/L (a) and 0.05 mol/L (b) H2SO4. (c) Overpotentials at 10 mA cm?2 and their relationship with Pt content. The solid and dashed columns represent in 0.5 mol/L and 0.05 mol/L H2SO4, respectively. (d) EIS Nyquist plots in 0.5 mol/L H2SO4 of Ru ONAs/C, 2%Pt-Ru ONAs/C, 5%Pt-Ru ONAs/C, and 10%Pt-Ru ONAs/C. (e) Stability tests of Ru ONAs/C, 5%Pt-Ru ONAs/C and Ir/C in 0.5 mol/L H2SO4.

Fig. 3. Ru 3p XPS (a), ratio of Ru4+/Ru0 (b), O 1s XPS (c) and concentration of O vacancies (d) of Ru ONAs/C, 2%Pt-Ru ONAs/C, 5%Pt-Ru ONAs/C; Pt 4f XPS (e) and corresponding structural illustration (f) of 5%Pt-Ru ONAs.

Fig. 4. The calculated free energies for removing a bridge O from RuO2(110) (a) and Pt-RuO2(110) (b). The dashed circles indicate the positions of the oxygen vacancy (OV). The stepwise diagrams for the free energies of the four elementary steps of OER on RuO2(110) (c) and Pt-RuO2(110)-OV (d).

Fig. 5. HER LSV curves of Ru ONAs/C, 5%Pt-Ru ONAs/C and commercial Pt/C in 0.5 mol/L (a) and 0.05 mol/L (b) H2SO4; Corresponding overpotentials at 10 mA cm?2 (c) and EIS Nyquist plots (d). Water splitting LSV curves of Ru ONAs/C, 5%Pt-Ru ONAs/C and Ir/C||Pt/C in 0.5 mol/L (e) and 0.05 mol/L (f) H2SO4.

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A trace of Pt can significantly boost RuO₂ for acidic water splitting

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