Abstract

The photoelectrocatalytic water splitting performance of the pristine hematite is limited because of its poor bulk charge separation efficiency. In this study, the lactic acid modified hematite films were grown in situ on Fluorine-doped tin oxide substrates by hydrothermal method and then annealed in nitrogen atmosphere. At 1.5 V versus RHE, the photocurrent density of the optimal lactic acid modified hematite photoanode (0.075LA-Fe₂O₃) was 1.5 mA cm^− 2, which was three times that of the based hematite (0.5 mA cm^− 2). The enhanced photoelectrocatalytic performance of the lactic acid modified hematite was attributed to its increased bulk charge separation efficiency caused by the oxygen vacancies and island-like pattern, as well as its improved surface charge injection efficiency. The effect of lactic acid on the morphology, crystalline structure and photoelectrocatalytic performance of the hematite photoanode are studied by systematical characterization.

Graphic abstract

中文翻译：

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乳酸对水热法制备赤铁矿光电催化水分解的影响

摘要

原始赤铁矿的光电催化水分解性能受到限制，因为其散装电荷分离效率差。在这项研究中，乳酸修饰的赤铁矿薄膜通过水热法在掺氟的氧化锡衬底上原位生长，然后在氮气氛中退火。在相对于RHE的1.5 V下，最佳的乳酸改性赤铁矿光阳极（0.075LA-Fe ₂ O ₃）的光电流密度为1.5 mA cm ^-2，是基础赤铁矿（0.5 mA cm ^-2）的三倍。）。乳酸改性的赤铁矿的增强的光电催化性能归因于其由于氧空位和岛状图案引起的大量电荷分离效率的提高，以及表面电荷注入效率的提高。通过系统表征，研究了乳酸对赤铁矿光阳极形态，晶体结构和光电催化性能的影响。

图形摘要