Recrystallization reduces surface oxygen vacancies to unlock hole transfer channel for hematite photoelectrochemistry

IF 2.4 4区物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Current Applied Physics Pub Date : 2024-08-14 DOI:10.1016/j.cap.2024.08.005

Jun Shang , Fuqiang Wang , Shiying Yin , Jinfeng Wang , Xuyang Shen , Ping Han

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Abstract

Hematite is a promising photoanode in photoelectrochemical water splitting system, but the slow water oxidation kinetics at the photoanode/electrolyte interface seriously limits the photoelectrochemical properties. Improving the surface state of hematite is an effective method to improve the transport and separation of carriers. Herein, we propose a strategy to recrystallize the hematite, which can effectively reduce the oxygen vacancies on the surface of hematite, increase active sites and improve the oxidation activity of water. The experimental results show that the charge recombination rate of the recrystallized Fe₂O₃ photoanode is reduced, and the carrier transport efficiency is improved. The photocurrent density at 1.23 V is four times higher than that of the original hematite, and the initial potential shifts negatively by about 20 mV, which is attributed to the upward bending of hematite energy band and the reduction of surface defects after treatment. This research provides a feasible strategy for designing efficient α-Fe₂O₃ photoanode.

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重结晶减少表面氧空位，为赤铁矿光电化学打开空穴传输通道

赤铁矿是光电化学分水系统中一种前景广阔的光阳极，但光阳极/电解质界面上缓慢的水氧化动力学严重限制了其光电化学特性。改善赤铁矿的表面状态是提高载流子传输和分离能力的有效方法。在此，我们提出了一种重结晶赤铁矿的策略，可以有效减少赤铁矿表面的氧空位，增加活性位点，提高水的氧化活性。实验结果表明，重结晶后的 Fe2O3 光阳极电荷重组率降低，载流子传输效率提高。在 1.23 V 时的光电流密度是原始赤铁矿的四倍，初始电位负移约 20 mV，这归因于处理后赤铁矿能带上弯和表面缺陷的减少。这项研究为设计高效的 α-Fe2O3 光阳极提供了一种可行的策略。

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

Current Applied Physics 物理-材料科学：综合

CiteScore

4.80

自引率

0.00%

发文量

213

审稿时长

33 days

期刊介绍： Current Applied Physics (Curr. Appl. Phys.) is a monthly published international journal covering all the fields of applied science investigating the physics of the advanced materials for future applications. Other areas covered: Experimental and theoretical aspects of advanced materials and devices dealing with synthesis or structural chemistry, physical and electronic properties, photonics, engineering applications, and uniquely pertinent measurement or analytical techniques. Current Applied Physics, published since 2001, covers physics, chemistry and materials science, including bio-materials, with their engineering aspects. It is a truly interdisciplinary journal opening a forum for scientists of all related fields, a unique point of the journal discriminating it from other worldwide and/or Pacific Rim applied physics journals. Regular research papers, letters and review articles with contents meeting the scope of the journal will be considered for publication after peer review. The Journal is owned by the Korean Physical Society.