Citation: Jingran Xiao, Longlong Fan, Zhongliang Huang, Jun Zhong, Feigang Zhao, Kaiji Xu, Shu-Feng Zhou, Guowu Zhan. Functional principle of the synergistic effect of co-loaded Co-Pi and FeOOH on Fe₂O₃ photoanodes for photoelectrochemical water oxidation[J]. Chinese Journal of Catalysis, ;2020, 41(11): 1761-1771. doi: 10.1016/S1872-2067(20)63618-X shu

Functional principle of the synergistic effect of co-loaded Co-Pi and FeOOH on Fe₂O₃ photoanodes for photoelectrochemical water oxidation

College of Chemical Engineering, Huaqiao University, Xiamen 361021, Fujian, China

Received Date: 23 February 2020
Revised Date: 29 March 2020

Fund Project: This work was supported by the Start-Up Scientific Research Funds for Newly Recruited Talents of Huaqiao University (605-50Y19013).

The establishment of multi-component catalytic systems on Fe₂O₃ photoanodes presents considerable potential for significantly enhancing the performance of photoelectrochemical water splitting systems. In this study, we hydrothermally synthesized a Fe₂O₃ photoanode. In addition, d-FeOOH synthesized via dip-coating and hydrothermally prepared h-FeOOH were used as cocatalysts and their synergistic combinations with cobalt phosphate (Co-Pi) were investigated. The synergy between h-FeOOH and Co-Pi was remarkable, whereas that between d-FeOOH and Co-Pi was negligible. For example, the onset potentials of the Co-Pi/h-FeOOH and Co-Pi/d-FeOOH dual catalysts, were cathodically shifted by 270 and 170 mV, respectively. Moreover, the photocurrent density of the Co-Pi/h-FeOOH/Fe₂O₃ anode was significantly higher than that of the Co-Pi/d-FeOOH/Fe₂O₃ one. The synergistic effect of Co-Pi and h-FeOOH could be attributed to the significantly inhibited recombination of surface charges owing to the formation of a p-n junction between β-FeOOH and Fe₂O₃ and the large contact area between the granular h-FeOOH and Co-Pi. However, the thin amorphous FeOOH layer of the Co-Pi/d-FeOOH/Fe₂O₃ anode acted as a hole-transfer medium, and weakly promoted the kinetics of the charge transfer process.
- Fe₂O₃,
- Synergistic effect,
- Onset potential,
- Photoanode,
- Water splitting
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Functional principle of the synergistic effect of co-loaded Co-Pi and FeOOH on Fe2O3 photoanodes for photoelectrochemical water oxidation

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通讯作者: 陈斌, bchen63@163.com

Functional principle of the synergistic effect of co-loaded Co-Pi and FeOOH on Fe₂O₃ photoanodes for photoelectrochemical water oxidation