A ternary calabash model photocatalyst (Pd/MoP)/CdS for enhancing H2 evolution under visible light irradiation
A ternary calabash model photocatalyst (Pd/MoP)/CdS for enhancing H2 evolution under visible light irradiation
复制标题
用于增强可见光照射下氢气析出的三元葫芦模型光催化剂（Pd/MoP）/CdS
DOI：
10.1016/j.apsusc.2021.150432
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发表时间：
2021-06-26
影响因子：
6.7
通讯作者：
Ma, Baojun
中科院分区：
文献类型：
--
作者：
Shen, Yuke;Li, Dekang;Ma, Baojun
贵金属和非贵金属助催化剂在提高光催化析氢性能方面各有优势。本文报道了一种新型的复合助催化剂（Pd/MoP）和三元光催化剂（Pd/MoP）/CdS的析氢反应。（Pd/MoP）/CdS的最佳光催化放氢速率达到943 μ mol/h，是MoP/CdS的2.1倍，是Pd/CdS的4.4倍。瞬态光电流响应、光致发光谱和表面光电压谱表明，（Pd/MoP）复合物在CdS上具有很高的电荷分离效率。恒电流充放电和循环伏安测试表明，MoP主要作为一个水库，以存储来自CdS的光激发电子。电化学阻抗谱和线性扫描伏安法表明，钯主要作为析氢的活性中心。最重要的是，阐明了三元光催化剂各部分的功能，提出了三元葫芦型光催化剂。
Noble metal and non-noble metal co-catalysts have their own advantages for improving photocatalytic hydrogen evolution. Here, we report a new composite co-catalyst (Pd/MoP) and a ternary photocatalyst (Pd/MoP)/CdS for hydrogen evolution. The optimum photocatalytic hydrogen evolution of (Pd/MoP)/CdS reaches 943 mu mol/h, which is 2.1 times of MoP/CdS and 4.4 times of Pd/CdS. Transient photocurrent responses, photoluminescence spectroscopies, and surface photovoltage spectroscopies demonstrated the combination of (Pd/MoP) makes highefficiency of charge separation on CdS. Galvanostatic charge/discharge and cyclic voltammetry tests revealed MoP mainly serves as a reservoir to store photo-excited electrons from CdS. Electrochemical impedance spectra and linear sweep voltammetry measures revealed Pd mainly acts as active sites for hydrogen evolution. Most importantly, the functions of each part of ternary photocatalyst for hydrogen evolution have been clarified, and a ternary calabash model photocatalyst for hydrogen evolution is put forward.