Ni Linxin, Xiao Yan, Zhou Xiangyu, Jiang Yinhua, Liu Yan, Zhang Wenli, Zhang Jianming, Liu Zhanchao
School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang212013, P. R. China.
Institute of Environmental Health and Ecological Security, School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang212013, P. R. China.
Inorg Chem. 2022 Dec 5;61(48):19552-19566. doi: 10.1021/acs.inorgchem.2c03491. Epub 2022 Nov 21.
Light-driven splitting of water to produce H and reduction of molecular oxygen to synthesize HO from water are the emerging environmentally friendly methods for converting solar energy into green energy and chemicals. In this paper, vacancy defect and heterojunction engineering effectively adjusted the conduction band position of ZnInS, enriched the electron density, broadened the optical absorption range, increased the specific surface area, and accelerated the charge carrier transfer and separation of g-CN/sulfur-vacancy-containing ZnInS (CN/Vs-ZIS) heterostructures. As a result, all of the CN/Vs-ZIS heterostructures possessed greatly enhanced photocatalytic activities and the optimized sample 2CN/Vs-ZIS exhibited the highest visible-light photocatalytic performance. The rate of generation of H of 2CN/Vs-ZIS under visible light (λ > 420 nm) was 6.55 mmol g h, which was 1.76 and 6.06 times higher than those of Vs-ZnInS and g-CN, respectively, and the apparent quantum yield (AQY) was 18.6% at 420 nm. Meanwhile, the 2 h yield of HO of 2CN/Vs-ZIS was 792.02 μM, ∼4.72 and ∼6.04 times higher than those of pure Vs-ZnInS and g-CN, respectively. The enhanced reaction mechanisms for the production of photocatalytic H and HO were also investigated. This work undoubtedly demonstrates that the synergistic effects of defect and heterojunction engineering will be the great promise for improving the photocatalytic efficiency of ZnInS-based materials.
光驱动水分解产生氢气以及将分子氧还原以从水中合成过氧化氢是将太阳能转化为绿色能源和化学品的新兴环保方法。本文中，空位缺陷和异质结工程有效地调整了ZnInS的导带位置，富集了电子密度，拓宽了光吸收范围，增加了比表面积，并加速了g-CN/含硫空位的ZnInS（CN/Vs-ZIS）异质结构中电荷载流子的转移和分离。结果，所有的CN/Vs-ZIS异质结构都具有大大增强的光催化活性，优化后的样品2CN/Vs-ZIS表现出最高的可见光光催化性能。2CN/Vs-ZIS在可见光（λ>420 nm）下的产氢速率为6.55 mmol g-1 h-1，分别是Vs-ZnInS和g-CN的1.76倍和6.06倍，在420 nm处的表观量子产率（AQY）为18.6%。同时，2CN/Vs-ZIS的2 h过氧化氢产率为792.02 μM，分别约为纯Vs-ZnInS和g-CN的4.72倍和6.04倍。还研究了光催化产氢和过氧化氢增强的反应机制。这项工作无疑表明，缺陷和异质结工程的协同效应将是提高ZnInS基材料光催化效率的巨大希望。
