Enhancing Photocurrent of Bismuth Manganate Photoanodes with Nanoislands of Bismuth Oxide

IF 3 4区化学 Q3 CHEMISTRY, PHYSICAL

ChemPhotoChem Pub Date : 2025-05-13 DOI:10.1002/cptc.202500003

Nitin P. Prasad, Sven Schneider, Clément Maheu, Chuanmu Tian, Jan P. Hofmann, Emiel J. M. Hensen, Anja Bieberle-Hütter

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Abstract

Photoelectrochemical (PEC) water splitting is a promising method for the energy transition. However, it is still hampered because the performance of the electrodes is too low. Herein, bismuth manganate (BMO) is investigated as a photoanode absorber material for PEC. BMO thin films are prepared by a sol–gel method with and without a bismuth oxide (BO) overlayer. It is found that the BO overlayer forms BO nanoislands after annealing. Under visible light illumination, BMO with BO nanoislands results in a nearly tenfold increase of the current density compared to pristine BMO at the same applied potential. This increased performance is related to a decrease in the charge transfer resistance and in the amount of recombinations based on the formation of a favorable heterojunction between BMO and BO. The application of overlayers on electrode materials in combination with suitable band alignment is an effective strategy to improve the performance of PEC electrodes.

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用氧化铋纳米岛增强锰酸铋光阳极的光电流

光电化学（PEC）水分解是一种很有前途的能量转换方法。然而，由于电极的性能太低，它仍然受到阻碍。本文研究了锰酸铋（BMO）作为PEC的光阳极吸收材料。采用溶胶-凝胶法制备了具有和不具有氧化铋（BO）覆盖层的BMO薄膜。结果表明，退火后的BO层形成了BO纳米岛。在可见光照射下，与原始BMO相比，具有BO纳米岛的BMO的电流密度增加了近10倍。这种性能的提高与电荷转移电阻的降低以及基于BMO和BO之间形成有利异质结的重组数量的减少有关。在电极材料上添加覆盖层并结合合适的带对准是提高PEC电极性能的有效策略。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

ChemPhotoChem Chemistry-Physical and Theoretical Chemistry

CiteScore

5.80

自引率

5.40%

发文量

165

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