MOF-Based Transparent Passivation Layer Modified ZnO Nanorod Arrays for Enhanced Photo-Electrochemical Water Splitting
MOF-Based Transparent Passivation Layer Modified ZnO Nanorod Arrays for Enhanced Photo-Electrochemical Water Splitting
复制标题
基于 MOF 的透明钝化层改性 ZnO 纳米棒阵列，用于增强光电化学水分解
DOI：
10.1002/aenm.201800101
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发表时间：
2018
影响因子：
27.8
通讯作者：
Yu Jiaguo
中科院分区：
文献类型：
--
作者：
Li Xiao;Liu Shengwei;Fan Ke;Liu Zhaoqing;Song Bo;Yu Jiaguo
本研究引入沸石咪唑酯骨架-8（ZIF-8）作为第一个基于金属有机骨架的透明表面钝化层用于光电化学（PEC）水裂解。基于在泡沫镍（NF）支撑的ZnO纳米棒阵列光阳极上原位无缝涂覆ZIF-8表面钝化层，证明了PEC水氧化的显著增强。通过优化ZIF-8的厚度和通过接枝Ni（OH）2纳米片作为协同助催化剂来改善PEC性能。相对于ZnO/NF，优化的Ni（OH）2/ZIF-8/ZnO/NF光阳极在AM 1.5 G下，在1.23 V下的光电流密度为1.95 mA cm-2，并且入射光子到电流的转换效率为40.05%（350 nm）。协同的表面钝化和助催化剂改性有助于延长电荷寿命，促进电荷转移，并降低水氧化的过电位。
This study introduces zeolitic imidazolate framework‐8 (ZIF‐8) as the first metal‐organic framework based transparent surface passivation layer for photo‐electrochemical (PEC) water splitting. A significant enhancement for PEC water oxidation is demonstrated based on the in situ seamless coating of ZIF‐8 surface passivation layer on Ni foam (NF) supported ZnO nanorod arrays photoanode. The PEC performance is improved by optimizing the ZIF‐8 thickness and by grafting Ni(OH)2nanosheets as synergetic co‐catalyst. With respect to ZnO/NF, the optimized Ni(OH)2/ZIF‐8/ZnO/NF photoanode exhibits a two times larger photocurrent density of 1.95 mA cm−2and also a two times larger incident photon to current conversion efficiency of 40.05% (350 nm) at 1.23 V versus RHE (VRHE) under AM 1.5 G. The synergetic surface passivation and the co‐catalyst modification contribute to prolonging the charge lifetime, to promoting the charge transfer, and to decreasing the overpotential for water oxidation.