CoP decorated with Co3O4 as a cocatalyst for enhanced photocatalytic hydrogen evolution via dye sensitization
CoP decorated with Co3O4 as a cocatalyst for enhanced photocatalytic hydrogen evolution via dye sensitization
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Co3O4 修饰的 CoP 作为助催化剂，通过染料敏化增强光催化析氢
DOI：
10.1016/j.apsusc.2019.05.113
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发表时间：
2019-09-01
影响因子：
6.7
通讯作者：
Li, Yuexiang
中科院分区：
文献类型：
--
作者：
Peng, Shaoqin;Cao, Yang;Li, Yuexiang
开发高效、稳定、廉价的析氢反应共催化剂已引起人们的广泛关注。本文以氢氧化钴和次亚磷酸钠为原料，通过简单的低温（300℃）固体磷化反应，合成了无贵金属助催化剂CoP/Co3O4复合材料。采用XPS、XRD、TEM、UV-Vis DRS和PL等技术对样品的组成、结构、形貌和光吸收性能进行了表征。以EY染料为敏化剂，三甲胺（TMA）为电子给体，作为HER助催化剂，在可见光（λ >= 420 nm）照射下，研究了CoP/Co3O4的光催化析氢活性。结果表明，CoP/Co3O4复合材料具有优异的光催化H-2析出活性和良好的稳定性。在最佳条件下，最高表观量子产率（AQY）达到40.5%。CoP表面修饰Co3O4的存在可以促进H2O在碱性介质中的解离，降低HER过电位，因此，CoP/Co3O4复合物对H-2的演化活性高于单独修饰CoP。
Developing effective, stable and cheap hydrogen evolution reaction (HER) cocatalysts have attracted great interest. Herein, noble-metal-free cocatalyst CoP/Co3O4 composite is synthesized via a simple low temperature (300 degrees C) solid phosphidation reaction using cobalt hydroxide and sodium hypophosphite. The composition, structure, morphology and photoabsorption performance of the as-prepared samples are characterized by XPS, XRD, TEM, UV-Vis DRS and PL technologies. As a HER cocatalyst, the photocatalytic hydrogen evolution activity of CoP/Co3O4 using EY dye as a sensitizer and trimethylamine (TMA) as an electron donor is investigated under visible light irradiation (lambda >= 420 nm). The result shows that CoP/Co3O4 composite exhibits excellent photocatalytic H-2 evolution activity and good stability. The highest apparent quantum yield (AQY) reaches 40.5% under the optimal conditions. The presence of Co3O4 decorated on CoP can promote H2O dissociation in the alkaline medium and decrease the HER overpotential, therefore, the activity of CoP/Co3O4 composite for the H-2 evolution is higher than CoP alone.