Chinese Journal of Catalysis ›› 2022, Vol. 43 ›› Issue (6): 1493-1501.DOI: 10.1016/S1872-2067(21)63952-9
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Qing Yaoa,†, Jiabo Leb,†, Shize Yangc, Jun Chengd, Qi Shaoa, Xiaoqing Huanga,d,*()
Received:
2021-08-02
Accepted:
2021-08-02
Online:
2022-06-18
Published:
2022-04-14
Contact:
Xiaoqing Huang
About author:
First author contact:† Contributed equally to this work.
Supported by:
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
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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