Enhanced interface charge transfer via n-n WO3/Ti-Fe2O3 heterojunction formation for water splitting
Enhanced interface charge transfer via n-n WO3/Ti-Fe2O3 heterojunction formation for water splitting
复制标题
通过 n-n WO3/Ti-Fe2O3 异质结形成增强界面电荷转移以实现水分解
DOI：
10.1016/j.jallcom.2019.06.371
复制
发表时间：
2019
影响因子：
6.2
通讯作者：
Xie Tengfeng
中科院分区：
文献类型：
--
作者：
Wu Qiannan;Bu Qijing;Li Shuo;Lin Yanhong;Zou Xiaoxin;Wang Dejun;Xie Tengfeng
α-Fe 2 O3光阳极的导电性差、空穴扩散长度短、电子-空穴复合率高等缺点限制了其对水的光电化学氧化性能。异质结的构建是提高光电阳极光电转换性能的有效途径。本文报道了两种简单的水热法制备的WO 3/Ti-Fe 2 O3异质结光阳极的设计。优化后的WO 3/Ti-Fe 2 O3光阳极在1.23 V下的光电流为2.15 mA/cm 2，比未添加助催化剂的可逆氢电极（RHE）有显著提高，高于文献报道的相应光电流。电化学阻抗谱（EIS）、瞬态光电压（TPV）和功函数（WF）的测量结果进一步证实了Ti-Fe 2 O3光阳极的电荷转移电阻降低，电荷分离效率提高。本工作也提供了新的机会，在开发高性能的光电阳极PEC水裂解。
Inevitable drawbacks on α-Fe2O3photoanodes, such as poor conductivity, short hole diffusion length, high electron-hole recombination rate, limit their photoelectrochemical (PEC) performance for water oxidation. The construction of heterojunction is an effective approach to improve the PEC performance of photoanodes. Herein, we report the design of the WO3/Ti–Fe2O3heterojunction photoanodes, which are synthesized by two simple hydrothermal method. The optimized WO3/Ti–Fe2O3photoanode shows remarkably improved photocurrent of 2.15 mA/cm2at 1.23 V versus reversible hydrogen electrode (RHE) without additional cocatalyst, which is higher than that of previous literatures. The improvement benefits from reduced charge transfer resistance in the bulk of Ti–Fe2O3photoanode and improved charge separation efficiency, which can been further confirmed by electrochemical impedance spectroscopy (EIS), the transient photovoltage (TPV) and the work function (WF) measurement. The present work also provide new opportunities in developing high performance photoanodes for PEC water splitting.