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Combined Modifications for Effectively Improving the Photoelectrochemical Performance of Hematite Photoanode
Author(s) -
Nie Tianshuo,
Cao Shiyao,
Wang Yuanbin,
Ji Zhen,
Bai Zhiming,
Yan Jingze,
Yan Xiaoqin
Publication year - 2021
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.202100249
Subject(s) - photocurrent , hematite , materials science , heterojunction , hydrothermal circulation , oxygen evolution , chemical engineering , doping , conductivity , water splitting , electrode , nanotechnology , electrochemistry , photocatalysis , catalysis , optoelectronics , chemistry , metallurgy , biochemistry , engineering
As the photoanode material of photoelectrochemical (PEC) cells, hematite (Fe 2 O 3 ) is a very promising candidate. Herein, the nanocoral‐like hematite film is designed using a simple hydrothermal method. The conductivity of the material improves by Ti ion doping, and a thin ZnFe 2 O 4 film is deposited on the surface to form the type‐II heterostructure, which regulates the transport path of the carriers. At the same time, the FeOOH catalyst accelerates the oxygen evolution kinetics on the electrode surface. Finally, the photocurrent density of the TiFe 2 O 3 /ZnFe 2 O 4 /FeOOH photoanode reaches 1.93 mA cm −2 at 1.23 V RHE , and the open voltage is negatively shifted by 200 mV, compared with the Fe 2 O 3 photoanode, down to 0.62 V. This work proves that element doping and surface modification improve the PEC performance by optimizing the transport path of carriers and increasing the reaction rate of oxygen evolution reaction.