WP modified S-scheme Zn0.5Cd0.5S/WO3 for efficient photocatalytic hydrogen production
WP modified S-scheme Zn0.5Cd0.5S/WO3 for efficient photocatalytic hydrogen production
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WP 改进了 S 型 Zn0.5Cd0.5S/WO3 以实现高效光催化制氢
DOI：
10.1039/c9nj04584h
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发表时间：
2019-12-28
影响因子：
3.3
通讯作者：
Ma, Qingxiang
中科院分区：
文献类型：
--
作者：
Gong, Haiming;Hao, Xuqiang;Ma, Qingxiang
本文首次采用简单的水热法和物理混合法制备了无贵金属的光催化剂WP/Zn 0. 5Cd 0. 5S/WO 3（WZP）。当WP：Zn0.5Cd0.5S：WO3的质量比为0.4：1：0.4时，5h内的产氢量可达26262 μ mol，是纯Zn0.5Cd0.5S的5.04倍。WZP复合材料不仅具有良好的稳定性，而且具有优异的表观量子效率（6.19%）。通过紫外-可见漫反射光谱和Mott-Schottky光谱的测量，确定了Zn_（0.5）Cd_（0.5）S和WO_3的带隙和导带位置，并初步确定了它们之间存在一个S-结构.此外，通过析氢实验结果的分析，进一步证实了S-图式的存在。UV-vis DRS、PL、TRPL和电化学等一系列表征结果表明，WP的加入大大提高了复合材料对可见光的吸收和响应。基于上述实验结果，提出了WZP光催化剂可能的析氢机理。这一工作为开发高性能、低成本的光催化材料提供了重要的一步。
In this work, a noble metal free photocatalyst WP/Zn0.5Cd0.5S/WO3 (WZP) was prepared for the first time by simple hydrothermal and physical mixing methods. When the mass ratio of WP : Zn0.5Cd0.5S : WO3 reaches 0.4 : 1 : 0.4, the hydrogen production could reach 26 262 mu mol within 5 h, which is about 5.04 times higher compared to pure Zn0.5Cd0.5S. The WZP composite not only has good stability but also excellent apparent quantum efficiency (6.19%). The band gaps and conduction band positions of Zn0.5Cd0.5S and WO3 were identified from the UV-vis DRS and Mott-Schottky results, and the existence of an S-scheme between them was preliminarily determined. In addition to this, the existence of the S-scheme was further confirmed by the analysis of hydrogen evolution test results. A series of characterization results such as UV-vis DRS, PL, TRPL and electrochemical results showed that the addition of WP greatly improved the absorption and response of the composite to visible light. Based on the above experimental results, the possible hydrogen evolution mechanism of the WZP photocatalyst was proposed. It is believed that this work marks an important step toward developing high-performance and low-cost photocatalytic materials for H-2 evolution.