Citation: Zhuofeng Hu, Weiqing Guo. New insight into the effect of interface supercapacitance on the performance of titanium dioxide/carbon nanowire array for photoelectrochemical water oxidation[J]. Chinese Chemical Letters, ;2021, 32(11): 3359-3363. doi: 10.1016/j.cclet.2021.04.004 shu

New insight into the effect of interface supercapacitance on the performance of titanium dioxide/carbon nanowire array for photoelectrochemical water oxidation

Zhuofeng Hu ^{a, *,} ,
Weiqing Guo ^b

a.
School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou 510006, China
b.
School of Environmental and Chemical Engineering, Foshan University, Foshan 528000, China

huzhf8@mail.sysu.edu.cn

Received Date: 17 January 2021
Revised Date: 29 January 2021
Accepted Date: 1 April 2021
Available Online: 3 April 2021

Figures(5)

The electrode/electrlyte interface is of great signifance to photoelectrochemical (PEC) water oxidation as the reaction mainly occur here. Herein, we focus on the effect of supercapactance of the electrode/electrlyte interface on the performance of PEC. It is discovered that the supercapacitor on the interface is crucial because it links the charge transport and solution ion adsorption on its two sides. In this study, we demonstrate an approach to promote the performance of TiO₂ nanowire array (TiO₂ NWs) photoanode in photoelectrochemical cells (PECs) by increasing its supercapacitance. A 2−5 nm carbon layer was coated and the interface supercapacitance increases by about 150 times. This enhances the separation rate of electron-hole pairs by collecting more holes. Meanwhile, it also promotes the water oxidation rate by adsorbing more OH⁻ on its surface. As a result, the photocurrent density of C-TiO₂ NWs was about 8 times higher than that of its carbon-free counterpart. This approach of increasing the supercapacitance of photoanodes would be attractive for enhancement of the efficiency of PECs and this work demonstrate the importance of supercapacitance of the interface for PECs.
- TiO₂,
- Carbon,
- Supercapacitor,
- Photoelectrochemical,
- Water oxidation
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