Intimately Contacted Ni2P on CdS Nanorods for Highly E ffi cient Photocatalytic H2 Evolution: New Phosphidation Route and the Interfacial Separation Mechanism of Charge Carriers

被引:110
作者
Wang, Ziqun [1 ]
Qi, Zhulin [1 ]
Fan, Xiujun [3 ]
Leung, Dennis Y. C. [2 ]
Long, Jinlin [4 ]
Zhang, Zizhong [4 ]
Miao, Tifang [1 ]
Meng, Sugang [1 ]
Chen, Shifu [1 ]
Fu, Xianliang [1 ]
机构
[1] Huaibei Normal Univ, Coll Chem & Mat Sci, Huaibei 235000, Anhui, Peoples R China
[2] Univ Hong Kong, Dept Mech Engn, Pokfulam Rd, Hong Kong, Peoples R China
[3] Shanxi Univ, Inst Crystalline Mat, Taiyuan 030006, Shanxi, Peoples R China
[4] Fuzhou Univ, Coll Chem, State Key Lab Photocatalysis Energy & Environm, Fuzhou 350116, Peoples R China
基金
中国国家自然科学基金;
关键词
Ni2P; Phosphidation; CdS nanorods; Photocatalytic Hydrogen Production; Solvothermal; METAL-FREE COCATALYST; IN-SITU SYNTHESIS; HYDROGEN EVOLUTION; EFFICIENT COCATALYST; RATIONAL SYNTHESIS; G-C3N4; NANOSHEETS; WATER; NANOPARTICLES; MOS2; SURFACE;
D O I
10.1016/j.apcatb.2020.119443
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A new phosphidation route based on a solvothermal method is demonstrated for the deposition of Ni2P on CdS nanorods photocatalyst with NaBH4 as a crucial reactant and (H2PO2)as dissolvable P precursor, which leads to a highly crystallized and well contacted Ni2P on CdS in an Ohmic-contact model. On the optimized sample (2% Ni2P/CdS), as high as 1.18 mmol.h(-1) H-2 evolution rate can be obtained over 50 mg sample, corresponding to an apparent quantum efficiency of 56% (under lambda = 435 nm irradiation). The activity is significantly higher than the samples prepared by conventional phosphidation processes and the classical Pt (2%) modified CdS. The remarkable HER performance can be ascribed to the loading of intimately contacted Ni2P, which can promote the separation of photoinduced charge carriers and simultaneously decreases the overpotential for H-2 evolution. Furthermore, a reservoir role for photoinduced ewas observed on the deposited Ni2P beyond as a cocatalyst.
引用
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页数:11
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