Fast solvent evaporation of phase pure CuBi2O4 photocathodes for photoelectrocatalytic water splitting

IF 4.5 3区 化学 Q1 Chemical Engineering Journal of Electroanalytical Chemistry Pub Date : 2023-09-01 DOI:10.1016/j.jelechem.2023.117639
Yiwen Wang , Junhua Hu , Suxiang Liu , Di Zhu , Baofeng Zhao , Angang Song
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Abstract

P-type metal oxide semiconductor CuBi2O4 exhibits excellent energy band structures and photoelectric response characteristics, which are critical for photoelectrocatalytic water splitting. However, the photocurrent densities are still well below the theoretical limit due to poor charge carrier separation and transport properties. In this work, we report a synthetic method for the preparation of phase-pure CuBi2O4 photocathode films via spray pyrolysis by adjusting the evaporation rate of the atomized droplets. An increase in the evaporation rate of the solvent may fix the structure of the deposited film faster and decrease the time available for the establishment of the segregation gradient, thus producing phase-pure semiconductor films. This method reduces process complexity and cost, and the applicability of spray pyrolysis for the preparation of phase-pure CuBi2O4 films is also confirmed. In addition, the photoelectrochemical evaluation of the samples prepared under different treatment conditions reveals that hole transport critically affects the photoelectrocatalytic performance of CuBi2O4 photocathodes. CuO can be used as a hole transport layer to promote the collection and transfer of holes and reduce the recombination of photogenerated carriers.

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相纯CuBi2O4光电阴极用于光电催化水分解的快速溶剂蒸发
p型金属氧化物半导体CuBi2O4具有优异的能带结构和光电响应特性,这是光电催化水分解的关键。然而,由于载流子分离和输运性能差,光电流密度仍然远低于理论极限。本文报道了一种通过调节雾化液滴的蒸发速率,通过喷雾热解法制备相纯CuBi2O4光电阴极薄膜的合成方法。溶剂蒸发速率的增加可以更快地固定沉积膜的结构,减少建立偏析梯度的时间,从而产生相纯半导体膜。该方法降低了工艺复杂度和成本,也证实了喷雾热解制备相纯CuBi2O4薄膜的适用性。此外,对不同处理条件下制备的样品进行了光电化学评价,发现空穴输运对CuBi2O4光电阴极的光电催化性能有重要影响。CuO可以作为空穴传输层,促进空穴的收集和转移,减少光生载流子的复合。
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来源期刊
Journal of Electroanalytical Chemistry
Journal of Electroanalytical Chemistry Chemical Engineering-General Chemical Engineering
CiteScore
7.50
自引率
6.70%
发文量
912
审稿时长
>12 weeks
期刊介绍: The Journal of Electroanalytical Chemistry is the foremost international journal devoted to the interdisciplinary subject of electrochemistry in all its aspects, theoretical as well as applied. Electrochemistry is a wide ranging area that is in a state of continuous evolution. Rather than compiling a long list of topics covered by the Journal, the editors would like to draw particular attention to the key issues of novelty, topicality and quality. Papers should present new and interesting electrochemical science in a way that is accessible to the reader. The presentation and discussion should be at a level that is consistent with the international status of the Journal. Reports describing the application of well-established techniques to problems that are essentially technical will not be accepted. Similarly, papers that report observations but fail to provide adequate interpretation will be rejected by the Editors. Papers dealing with technical electrochemistry should be submitted to other specialist journals unless the authors can show that their work provides substantially new insights into electrochemical processes.
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