Metal Complex/ZnS-Modified Ni Foam as Magnetically Stirrable Photocatalysts: Roles of Redox Mediators and Carrier Dynamics Monitored by Operando Synchrotron X-ray Spectroscopy
學年 111
學期 1
出版（發表）日期 2022-08-24
作品名稱 Metal Complex/ZnS-Modified Ni Foam as Magnetically Stirrable Photocatalysts: Roles of Redox Mediators and Carrier Dynamics Monitored by Operando Synchrotron X-ray Spectroscopy
作品名稱（其他語言）
著者 Chi-Jung Chang, Pei-Yao Chao, Jem-Kun Chen, Arul Pundi, Yuan-Hsiang Yu, Chao-Lung Chiang, Yan-Gu Lin
單位
出版者
著錄名稱、卷期、頁數 ACS Applied Materials & Interfaces, 14(37), 41870-41882
摘要 Magnetically stirrable photocatalysts binding the ZnS-decorated Ni foam with the metal complex cocatalyst as a redox mediator and light-absorbing composition were investigated. Loading metal complex can improve light absorption, surface hydrophilicity, interfacial charge migration, and H2 production activity. The variation of the metal valences of the composite photocatalysts in an operando environment (with sacrificial agent solution) with and without light irradiation was investigated by X-ray absorption near-edge structure (XANES) spectra and Fourier-transformed extended X-ray absorption fine structure (EXAFS) spectra to monitor the charge carrier dynamics of photocatalysis and explain how the macrocyclic Cu complex (CuC) acted as a redox mediator better than the Ni complex. The smaller valence difference of copper valence in ZS/CuC for dark and light states revealed that the Cu complex facilitates a reversible electron transfer between the ZnS photocatalyst and H+. Loading the Cu complex can improve the separation of photogenerated carriers by the redox couple of complexes, leading to a significantly improved photocatalytic H2 production activity of 8150 μmol h–1 g–1. The reactants can flow through these magnetically stirrable Ni foam-based photocatalysts by magnetic-field-driven stirring, which improves the contact between photocatalysts and the sacrificial agents. The operando synchrotron provides new insights for understanding the roles of redox mediators.
關鍵字 Photocatalytic H2 production, Redox mediator, Metal complex, Ni foam, Operando, X-ray absorption spectra, Magnetically stirrable
語言 en_US
ISSN
期刊性質 國外
收錄於 SCI SSCI Scopus
產學合作
通訊作者 Chi-Jung Chang, Yan-Gu Lin
審稿制度 是
國別 USA
公開徵稿
出版型式 ,電子版
SDGS 可負擔的潔淨能源,產業創新與基礎設施