摘要
采用一步煅烧法使类石墨烯碳氮化合物(g-C_3N_4)和磷化镍(Ni_2P)复合并对其光催化产氢性能进行研究.利用X射线粉末衍射、透射电镜、X射线光电子能谱、紫外可见光谱对该复合催化剂的组成、形貌等进行了表征.研究了不同含量的Ni_2P以及不同牺牲剂对g-C_3N_4/Ni_2P光催化性能的影响.与单独的g-C_3N_4相比,该复合催化剂的光催化产氢速率提高了13倍,可以达到165μmol g^(-1)·h^(-1).利用光电化学和光致发光光谱等技术对该复合光催化剂的光催化产氢机理进行研究,结果表明Ni_2P在高效分离光生载流子方面起了关键作用,并且g-C_3N_4和Ni_2P的复合产生了协同效应加速了电子-空穴对的分离,提高了光催化产氢性能.
Graphitic carbon nitride（ g-C3N4） and nickel phosphide（ Ni2P） photocatalysts were integrated via a facile heating method for photocatalytic hydrogen evolution. The resulted photocatalysts were characterized by X-ray diffraction,scanning electron microscopy,transmission electron microscopy,energy dispersive X-ray spectroscopy,ultraviolet-visible diffuse reection spectroscopy and X-ray photoelectron spectroscopy. The photocatalytic hydrogen evolution was investigated for g-C3N4/Ni2P with different contents of Ni2P,also explored in different sacrificial agent aqueous solutions. Compared with the g-C3N4,the photocatalytic hydrogen production rate of the compo-site catalyst increased by 13 times,reaching 165 μmol g^（-1）·h^（-1）. The photoelectrochemical I-t curves and photoluminescence spectroscopy were tested to research the mechanism of hydrogen production. It suggested that Ni2P played a key role,which might lead to efficiently separation of the photo-generated charge carriers,and the combination of g-C3N4 and Ni2P produced a synergistic effect that accelerated the separation of electron-hole pairs,enhanced the photocatalytic H2 production activity.
作者
赵云霏
毋瑞仙
蒋平平
董玉明
ZHAO Yun-fei;WU Rui-xian;JIANG Ping-ping;DONG Yu-ming(International Joint Research Center for Photoresponsive Molecules and Materials, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China)
出处
《分子催化》
EI
CAS
CSCD
北大核心
2018年第2期142-151,共10页
Journal of Molecular Catalysis(China)
基金
国家自然科学基金(21676123)
江苏省自然科学基金(BK20161127)资助项目~~
关键词
类石墨烯碳氮化合物
磷化镍
复合光催化剂
析氢反应
graphitic carbon nitride
nickel phosphide
composite photocatalysts
hydrogen evolution reaction
