Mo-doped Ni2P hollow nanostructures: highly efficient and durable bifunctional electrocatalysts for alkaline water splitting

被引:135
作者
Wang, Qin [1 ]
Zhao, Hongyang [2 ]
Li, Fumin [1 ]
She, Wenyan [1 ]
Wang, Xiaoming [1 ]
Xu, Ling [1 ]
Jiao, Huan [1 ]
机构
[1] Shaanxi Normal Univ, Shaanxi Engn Lab Adv Energy Technol, Shaanxi Key Lab Adv Energy Devices, Key Lab Macromol Sci Shaanxi Prov,Sch Chem & Chem, 199 Changan Rd, Xian 710062, Shaanxi, Peoples R China
[2] Xi An Jiao Tong Univ, Sch Sci, Xian 710054, Shaanxi, Peoples R China
基金
中国国家自然科学基金;
关键词
HYDROGEN EVOLUTION; OXYGEN; CATALYST; CONVERSION; NANOSHEETS; ELECTRODE; FOAM;
D O I
10.1039/c9ta01015g
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
The fabrication of an efficient bifunctional electrocatalyst towards alkaline overall water splitting is challenging, but in high demand. Herein, we report the construction of Mo-doped Ni2P hollow nanostructures through a solvothermal method and in situ phosphorization strategy. The Mo-doped Ni2P hollow nanostructures demonstrate excellent hydrogen evolution reaction (HER) activity in 1.0 M KOH solution with a low cathodic overpotential of 81 mV (10 mA cm(-2), glassy carbon) and a small Tafel slope of 53.4 mV dec(-1). First-principles density functional theory calculations reveal the mechanism of the alkaline HER. For pristine Ni2P, the P site serves as the active center. After Mo doping, the active center transforms to a bridging Mo-Ni site and the corresponding Gibbs free energy of H* absorption (G(H*)) decreases from 0.33 eV (P site) to 0.21 eV (bridging Mo-Ni site). The optimal active site with a smaller G(H*) can accelerate the charge transfer process for H* intermedium and H-2 production. For the oxygen evolution reaction (OER), the Mo-doped Ni2P hollow nanostructures require 270 mV to attain 20 mA cm(-2) (glassy carbon), with a small Tafel slope of 68.5 mV dec(-1). Impressively, both the HER and OER catalysis exhibit durable performance in alkaline electrolyte. When the Mo-doped Ni2P hollow nanostructures are applied as bifunctional electrocatalysts for alkaline overall water splitting, the demanded cell voltage is only 1.54 V (10 mA cm(-2), nickel foam).
引用
收藏
页码:7636 / 7643
页数:8
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