Preparation of a BiVO4 nanoporous photoanode based on peroxovanadate reduction and conversion for efficient photoelectrochemical performance
Preparation of a BiVO4 nanoporous photoanode based on peroxovanadate reduction and conversion for efficient photoelectrochemical performance
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基于过氧钒酸盐还原和转化的 BiVO4 纳米多孔光阳极的制备以实现高效的光电化学性能
DOI：
10.1039/c7nr07566a
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发表时间：
2018
期刊：
影响因子：
6.7
通讯作者：
Zhou Baoxue
中科院分区：
文献类型：
--
作者：
Xia Ligang;Li Jinhua;Bai Jing;Li Linsen;Zeng Qingyi;Xu Qunjie;Zhou Baoxue
提出了一种独特、可控、简便的基于过钒酸盐还原转化法制备BiVO4纳米孔膜的方法。该方法采用乙醇对过钒酸盐进行缓慢可控的还原，这是保证V2O5·xH2O均匀沉积在f掺杂氧化锡衬底上的关键步骤，随后在聚乙二醇的取向作用下，通过简单的Bi3+浸渍法将退火后的V2O5·xH2O薄膜转化为BiVO4薄膜。转换后的BiVO4薄膜具有单一单斜白钨矿结构，在AM 1.5G光照下，在0.1 M KH2PO4 （pH 7）中，在1.23 V下表现出最佳的水分解光电流密度为1.10 mA cm−2，在400 nm处，使用退火V2O5·xH2O薄膜沉积3小时，入射光子-电流转换效率为~ 22.4%。BiVO4膜在PEC降解亚甲基蓝和盐酸四环素中也表现出良好的水裂解性能和降解效率，速率常数分别为0.63 h−1和0.21 h−1。
A unique, controllable and facile method based on peroxovanadate reduction and conversion to prepare BiVO4 nanoporous films is presented. In this method, a slow and controllable reduction of peroxovanadate with ethanol was used, which was the crucial step to ensure the uniform deposition of V2O5·xH2O on an F-doped tin oxide substrate, and subsequently the annealed V2O5·xH2O film was converted to a BiVO4 film by a simple impregnation method with Bi3+ under the oriented effect of polyethylene glycol. The converted BiVO4 film possessed a single monoclinic scheelite structure and exhibited an optimal water splitting photocurrent density of 1.10 mA cm−2 at 1.23 V vs. RHE in 0.1 M KH2PO4 (pH 7) under AM 1.5G illumination with an incident photon-to-current conversion efficiency of ∼22.4% at 400 nm using an annealed V2O5·xH2O film deposited for 3 hours. The BiVO4 film also showed excellent water splitting performance and degradation efficiency in the PEC degradation of methylene blue and tetracycline hydrochloride with a rate constant of 0.63 h−1 and 0.21 h−1, respectively.