Zhao Hui, Jiang Pingping, Cai Wen
Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Jiangsu Engineering and Technology Research Center of Environmental Cleaning Materials, Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, 219 Ningliu Road, Nanjing, 210044, China.
Key Laboratory of Food Colloids and Biotechnology (Ministry of Education of China), School of Chemical and Material Engineering, Jiangnan University, 1800 Lihu Avenue, Wuxi, 214122, China.
Chem Asian J. 2017 Feb 1;12(3):361-365. doi: 10.1002/asia.201601543. Epub 2017 Jan 4.
In this work, graphitic C N decorated with a CoP co-catalyst (g-C N /CoP) is reported for photocatalytic H evolution reaction based on two-step hydrothermal and phosphidation method. The structure of g-C N /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-C N /CoP-3.4 %), the highest H evolution amount of 8.4×10 μmol g is obtained, which is 1.1×10 times than that over pure g-C N . This value also is comparable with that of g-C N loaded by the same amount of Pt. In cycling experiments, g-C N /CoP-3.4 % shows a stable photocatalytic activity. In addition, g-C N /CoP-3.4 % is an efficient photocatalyst for H 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-C N /CoP-3.4 % and pure g-C N , it is concluded that the presence of the CoP co-catalyst accelerates the separation and transfer of photogenerated electrons of g-C N , thus resulting in improved photocatalytic activity in the H evolution reaction.
在这项工作中，报道了基于两步水热法和磷化法制备的负载CoP助催化剂的石墨相氮化碳（g-C₃N₄/CoP）用于光催化析氢反应。通过XRD、FTIR、TEM、XPS和UV/Vis漫反射光谱技术对g-C₃N₄/CoP的结构进行了充分证实。当CoP负载的重量百分比为3.4 wt %（g-C₃N₄/CoP-3.4 %）时，获得了最高析氢量8.4×10⁻⁶ μmol g⁻¹，这是纯g-C₃N₄析氢量的1.1×10³倍。该值也与负载相同量Pt的g-C₃N₄相当。在循环实验中，g-C₃N₄/CoP-3.4 %表现出稳定的光催化活性。此外，g-C₃N₄/CoP-3.4 %是一种在自然太阳光照射下用于析氢的高效光催化剂。基于g-C₃N₄/CoP-3.4 %与纯g-C₃N₄之间的对比光致发光发射光谱、光电化学I-t曲线、EIS奈奎斯特图和极化曲线，得出CoP助催化剂的存在加速了g-C₃N₄光生电子的分离和转移，从而导致析氢反应中光催化活性提高的结论。
