Photoelectrochemical Performance for Water Oxidation Improved by Molecular Nickel Porphyrin-Integrated WO3/TiO2 Photoanode
Photoelectrochemical Performance for Water Oxidation Improved by Molecular Nickel Porphyrin-Integrated WO3/TiO2 Photoanode
复制标题
分子镍卟啉集成 WO3/TiO2 光阳极改善水氧化的光电化学性能
DOI：
10.1002/cssc.201800705
复制
发表时间：
2018
期刊：
影响因子：
8.4
通讯作者：
Na Yong
中科院分区：
文献类型：
--
作者：
Wei Peicheng;Lin Kaifeng;Meng Dedong;Xie Tengfeng;Na Yong
采用 法在介孔二氧化钛电极上原位生长WO_3/TiO_2异质结光阳极。用暂态表面光电压谱表征了这类第二类异质结的光致电荷转移特性和电荷分离的改善。通过使用亚硫酸盐氧化作为空穴清除剂，我们证明了72 %的光生空穴到达光阳极表面，而空穴注入(ηox)到电解液中的效率仅为48 %。首次将NiIimeso-四(4-羧基苯基)卟啉(NiTCPP)作为水氧化催化剂引入到WO_3/TiO_2异质结光阳极中，使η的ox值提高到81 %。与可逆氢电极相比，WO_3/TiO_2/NiTCPP光阳极的最大偏置光电转换效率为0.2 %(1.01 V)，在此条件下，水氧化的法拉第效率为89 %(平均光解时间超过1 h)。
A WO3/TiO2heterojunction photoanode was prepared by in situ growth of WO3on a mesoporous TiO2electrode. The photoinduced charge‐transfer properties and chargeseparation improvement in this kind of type‐II heterojunction were characterized by transient surface photovoltage spectra. By using sulfite oxidation as a hole scavenger, we demonstrated that 72 % of the photo‐generated holes are reaching the surface of the photoanode, but the efficiency of hole injection (ηox) into the electrolyte was only 48 %. For the first time, a NiIImeso‐tetra(4‐carboxyphenyl)porphyrin (NiTCPP) was incorporated as a water oxidation catalyst into the WO3/TiO2heterojunction photoanode, which promoted the value ofηoxto 81 %. The maximum applied bias photon‐to‐current efficiency for the WO3/TiO2/NiTCPP photoanode was determined to be 0.2 % at 1.01 V vs. the reversible hydrogen electrode (RHE), under which condition a Faradic efficiency of 89 % for water oxidation was achieved (averaged over 1 h of photolysis).