Effects of alkali ion on boosting WO3 photoelectrochemical performance by electrochemical doping
Effects of alkali ion on boosting WO3 photoelectrochemical performance by electrochemical doping
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碱离子对电化学掺杂增强WO3光电化学性能的影响
DOI：
10.1016/j.ijhydene.2020.05.057
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发表时间：
2020-07-31
影响因子：
7.2
通讯作者：
Li, Jie
中科院分区：
文献类型：
--
作者：
Yin, Xiang;Qiu, Weixin;Li, Jie
电化学掺杂是一种很有前景的改变半导体光电化学性能的方法。使用H离子作为补偿阳离子的已发表的作品显示出光电流的增加，但关于光电化学性能改善的原因理论不同。在本文中，我们介绍了使用碱金属硫酸盐（（Li/Na/K）（2）SO4）作为电化学掺杂电解质时阳离子的影响和增强的关键因素。电化学掺杂后WO3 薄膜的有效电极表面积（ECSA）增加。锂离子具有最小的半径，因此插入 WO3 电池的潜力最高，导致插入 WO3 的锂离子在三个电化学掺杂样品中具有最高的光电流。为了研究影响光电化学性能的可能因素，电化学掺杂样品和对照样品在惰性气体（Ar）下退火。退火后观察到电化学掺杂样品的光电流较低，证实关键因素是电化学掺杂和离子补偿引起的有效电极表面积的增加，而不是离子本身以及碱金属离子与W或O之间的化学键。(C) 2020 Hydrogen Energy Publications LLC。由爱思唯尔有限公司出版。保留所有权利。
Electrochemical doping is a promising method to modify the photoelectrochemical performance of semiconductors. The published works using H ions as compensated cations have shown increased photocurrents, but theories vary about the causes of the improvement of photoelectrochemical performance. In this paper, we present the effects of cation ion and the key factors of enhancement using alkali sulfates ((Li/Na/K)(2)SO4) as the electrolyte for electrochemical doping. The effective electrode surface area (ECSA) was increased for the WO3 film after electrochemical doping. The Li-ion, with the smallest radius and thereby the highest potential to insert into the WO3 cell, results in the Li ion inserted WO3 with the highest photocurrent in the three electrochemically doped samples. To investigate the possible factors affecting the photoelectrochemical performance, the electrochemically doped samples and a control sample were annealed under inert gas (Ar). The lower photocurrents were observed for the electrochemically doped samples after annealing, confirming that the key factors are the increase of the effective electrode surface area caused by electrochemical doping and ion compensation, rather than the ions themselves and the chemical bonds between alkali ions and W or O. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.