Chinese Journal of Catalysis ›› 2021, Vol. 42 ›› Issue (8): 1387-1394.DOI: 10.1016/S1872-2067(20)63647-6
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Rajender Boddulaa, Guancai Xiea,b, Beidou Guoa,b, Jian Ru Gonga,b,*()
Received:
2020-02-28
Accepted:
2020-03-23
Online:
2021-08-18
Published:
2021-03-18
Contact:
Jian Ru Gong
About author:
*. Tel: +86-10-82545649; Fax: +86-10-62656765; E-mail: gongjr@nanoctr.cn† These authors contributed equally to this paper.
Supported by:
Rajender Boddula, Guancai Xie, Beidou Guo, Jian Ru Gong. Role of transition-metal electrocatalysts for oxygen evolution with Si-based photoanodes[J]. Chinese Journal of Catalysis, 2021, 42(8): 1387-1394.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(20)63647-6
Fig. 1. (a) Schematic configuration of n+p-Si/SiOx/aFe:MOOH (M = Fe, Co, Ni) photoanodes; (b) cross-sectional SEM image and (c) XPS profiles of Ni 2p, Fe 2p, and O 1s for the n+p-Si/SiOx/aFe:NiOOH photoanode.
Fig. 2. (a) CV curves of n+p-Si/SiOx/aFe:MOOH photoanodes (dotted lines shows dark conditions: aFe (black); aFe:FeOOH (blue); aFe:CoOOH (yellow); and aFe:NiOOH (red)); (b) O2 production measured (black line) and calculated based on the charge passed assuming 100% faradaic efficiency (red line); and (c) ABPE for the n+p-Si/SiOx/aFe:NiOOH photoanode conducted in 1 M KOH electrolyte under illumination at 100 mW cm-2 (AM 1.5 G).
Fig. 3. (a) Tafel plots extracted from the current density-voltage (J-V) measurements at a scan rate of 50 mV s-1; (b) Capacitive currents at different scan rates (The linear slope, equivalent to twice of the double-layer capacitance Cdl, is used to represent the ECSA); and (c) impedance Nyquist plots measured at 1.23 VRHE for the n+p-Si/SiOx/aFe photoanodes with and without the MOOH overlayer for experiments conducted in 1 M KOH under irradiation at 100 mW cm-2 (AM 1.5 G).
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