非阻塞I/O
光电流
材料科学
异质结
分解水
可逆氢电极
化学工程
兴奋剂
纳米棒
纳米颗粒
赤铁矿
纳米技术
电极
电化学
催化作用
光电子学
光催化
化学
物理化学
工作电极
冶金
工程类
生物化学
作者
Feng Li,Jing Li,Jie Zhang,Lili Gao,Xuefeng Long,Yiping Hu,Shuwen Li,Jun Jin,Jiantai Ma
出处
期刊:Chemsuschem
[Wiley]
日期:2018-06-13
卷期号:11 (13): 2156-2164
被引量:67
标识
DOI:10.1002/cssc.201800571
摘要
Abstract The photoelectrochemical (PEC) water‐splitting efficiency of a hematite‐based photoanode is still far from the theoretical value due to its poor surface reaction kinetics and high density of surface trapping states. To solve these drawbacks, a photoanode consisting of NiO nanoparticles anchored on a gradient phosphorus‐doped α‐Fe 2 O 3 nanorod (NR) array (NiO/P‐α‐Fe 2 O 3 ) was fabricated to achieve optimal light absorption and charge separation, as well as rapid surface reaction kinetics. Specifically, a photoanode with the NR array structure allowed a high mass‐transport rate to be achieved, while phosphorus doping effectively decreased the number of surface trapping sites and improved the electrical conductivity of α‐Fe 2 O 3 . Furthermore, the p–n junction that forms between NiO and P‐α‐Fe 2 O 3 can further improve the PEC performance due to efficient hole extraction and the water oxidization catalytic activity of NiO. Consequently, the NiO/P‐α‐Fe 2 O 3 NR photoanode produced a high photocurrent density of 2.08 mA cm −2 at 1.23 V versus a reversible hydrogen electrode and a 110 mV cathodic shift of the onset potential. This rational design of structure offers a new perspective in exploring high‐performance PEC photoanodes.
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