College of Chemistry, Jilin University, Changchun, 130012, P. R. China.
Huaiyin Institute of Technology, Huaian, 223001, P. R. China.
ChemSusChem. 2018 Jan 10;11(1):276-284. doi: 10.1002/cssc.201701574. Epub 2017 Nov 23.
Although NiCoP has attracted much attention in the field of electrocatalysis, the study of its photocatalytic activity and mechanism have been somewhat limited. NiCoP/g-C N , synthesized by simple one-pot method, is a highly efficient photocatalyst for hydrogen production from water. NiCoP/g-C N exhibits a hydrogen evolution rate of 1643 μmol h g , which is 21 times higher than that of bare g-C N . The excellent performance is due to a combination of improved separation efficiency and effective charge transfer efficiency. The photogenerated charge behavior is characterized by the surface photovoltage (SPV), transient photovoltage (TPV), and photoluminescence spectroscopy. The photogenerated charge transport is investigated by electrochemical impedance spectroscopy and polarization curve. Moreover, the effective charge transfer efficiency was measured according to the mimetic apparent quantum yield. SPV and TPV measurements, whereby 10 vol % of a triethanolamine-water mixture was added into the testing system, were taken to simulate the real atmosphere for photocatalytic reaction, which can give rise to the photogenerated charge transfer process. A possible photocatalytic mechanism was also proposed. This study may provide an efficient theoretical basis to design transition metal phosphide cocatalyst-modified photocatalysts.
尽管 NiCoP 在电催化领域引起了广泛关注，但对其光催化活性和机制的研究仍有些局限。通过简单的一锅法合成的 NiCoP/g-C3N4，是一种高效的光解水产氢催化剂。NiCoP/g-C3N4的析氢速率达到 1643 μmol h-1g-1，是纯 g-C3N4的 21 倍。其优异的性能归因于提高的分离效率和有效的电荷转移效率的结合。通过表面光电压（SPV）、瞬时光电压（TPV）和光致发光光谱对光生电荷行为进行了表征。通过电化学阻抗谱和极化曲线研究了光生载流子的输运。此外，根据模拟表观量子产率来测量有效电荷转移效率。通过添加 10 体积%的三乙醇胺-水混合物到测试系统中，进行 SPV 和 TPV 测量，模拟了实际的光催化反应气氛，这可以引发光生电荷转移过程。还提出了一种可能的光催化机制。本研究可能为设计过渡金属磷化物共催化剂修饰的光催化剂提供有效的理论依据。
