Graphitic C3N4 Decorated with CoP Co-catalyst: Enhanced and Stable Photocatalytic H2 Evolution Activity from Water under Visible-light Irradiation
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- 作者：Dr. Hui Zhao ; Prof. Pingping Jiang and Dr. Wen Cai
- 刊名：Chemistry – An Asian Journal
- 出版年：2017
- 出版时间：February 1, 2017
- 年：2017
- 卷：12
- 期：3
- 页码：361-365
- 全文大小：1132K
- ISSN：1861-471X
文摘
In this work, graphitic C3N4 decorated with a CoP co-catalyst (g-C3N4/CoP) is reported for photocatalytic H2 evolution reaction based on two-step hydrothermal and phosphidation method. The structure of g-C3N4/CoP is well confirmed by XRD, FTIR, TEM, XPS, and UV/Vis diffuse reflection spectra techniques. When the weight percentage of CoP loading is 3.4 wt % (g-C3N4/CoP-3.4 %), the highest H2 evolution amount of 8.4×102 μmol g−1 is obtained, which is 1.1×103 times than that over pure g-C3N4. This value also is comparable with that of g-C3N4 loaded by the same amount of Pt. In cycling experiments, g-C3N4/CoP-3.4 % shows a stable photocatalytic activity. In addition, g-C3N4/CoP-3.4 % is an efficient photocatalyst for H2 evolution under irradiation with natural solar light. Based on comparative photoluminescence emission spectra, photoelectrochemical I–t curves, EIS Nyquist plots, and polarization curves between g-C3N4/CoP-3.4 % and pure g-C3N4, it is concluded that the presence of the CoP co-catalyst accelerates the separation and transfer of photogenerated electrons of g-C3N4, thus resulting in improved photocatalytic activity in the H2 evolution reaction.