Insight into the charge transfer in particulate Ta3 N5 photoanode with high photoelectrochemical performance

Chemical Science
Zhiliang WangCan Li

Abstract

Charge separation is one of the most critical factors for generating solar fuels via photoelectrochemical water splitting, but it is still not well understood. This work reveals the fundamental role of charge transfer in photoanodes for achieving high charge separation efficiency. Specifically, we fabricated a particulate Ta3N5 photoanode by a bottom-up method. By improving the charge separation with refined necking treatment, the photocurrent is increased by two orders of magnitude. The charge separation efficiency (ηsep) is analyzed by dividing it into charge generation efficiency (Φgene) and transportation efficiency (Φtrans). Necking treatment is found to substantially improve the electron transfer. Transient photovoltage (TPV) measurements based on the Dember effect is used to confirm the benefit of necking treatment in improving the charge transportation. The superior electron transfer in the necked-Ta3N5 electrode is further evidenced by the facile electron exchange reaction with the ferri/ferrocyanide redox couple. Moreover, cobalt phosphate is found to promote both charge separation and surface reaction, resulting in a photocurrent of 6.1 mA cm-2 at 1.23 V vs. RHE, which is the highest response for a particulate photoa...Continue Reading

References

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Citations

Oct 9, 2019·The Journal of Chemical Physics·Yumin HeDunwei Wang
Jul 17, 2020·The Journal of Chemical Physics·Zhiliang WangLianzhou Wang
Jan 13, 2018·Physical Chemistry Chemical Physics : PCCP·Sung Gyu HanYun Jeong Hwang
Aug 21, 2018·Advanced Materials·Mu XiaoLianzhou Wang
Aug 23, 2018·Physical Chemistry Chemical Physics : PCCP·Zhiliang WangLianzhou Wang
Apr 10, 2021·ACS Applied Materials & Interfaces·Keyan LiDunwei Wang
Feb 13, 2020·The Journal of Physical Chemistry Letters·Xin WangZhigang Zou
Oct 4, 2017·The Journal of Physical Chemistry Letters·Jinzhan SuLionel Vayssieres
Dec 10, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Xiaoli FanJianping He

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Methods Mentioned

BETA
transmission electron microscopy
electron exchange

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