Stabilizing and Activating Metastable Nickel Nanocrystals for Highly Efficient Hydrogen Evolution Electrocatalysis

Shao, Q (Shao, Qi)[ 1 ] ; Yang, Y (Yang, Yu)[ 2 ] ; Yang, SZ (Yang, Shize)[ 3,4 ] ; Lu, KY (Lu, Kunyan)[ 1 ] ; Zhang, Y (Zhang, Ying)[ 1 ] ; Tang, CY (Tang, Chongyang)[ 1 ] ; Song, J (Song, Jia)[ 1 ] ; Feng, YG (Feng, Yonggang)[ 1 ] ; Xiong, LK (Xiong, Likun)[ 5 ] ; Peng, Y (Peng, Yang)[ 5 ] ; Li, YF (Li, Yafei)[ 2 ]*（李亚飞）; Xin, HLL (Xin, Huolin L.)[ 4 ] ; Huang, XQ (Huang, Xiaoqing)[ 1 ]*

[ 1 ] Soochow Univ, Coll Chem Chem Engn & Mat Sci, Suzhou 215123, Jiangsu, Peoples R China

[ 2 ] Nanjing Normal Univ, Sch Chem & Mat Sci, Jiangsu Collaborat Innovat Ctr Biomed Funct Mat, Nanjing 210023, Jiangsu, Peoples R China

[ 3 ] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA

[ 4 ] Brookhaven Natl Lab, Ctr Funct Nanomat, Upton, NY 11973 USA

[ 5 ] Soochow Univ, Coll Phys Optoelect & Energy, Soochow Inst Energy & Mat Innovat, Suzhou 215006, Jiangsu, Peoples R China

ACS NANO, 201811,12(11),11625-11631

Exploring high-performance and cost-efficient electrocatalysts with unusual metastable phase offers opportunities for improving the electrochemical hydrogen generation, while it remains a great challenge to achieve them with desirable activity and stability. Herein, we report that the doping engineering in a metastable, hexagonal-close-packed nickel (hcp Ni) electrocatalyst is a largely unrevealed yet important factor in achieving an extremely active and stable electrocatalyst toward alkaline hydrogen evolution reaction (HER). Theoretical predications and experimental results suggest that, while the stability of metastable hcp Ni electrocatalyst can be largely improved via the manganese (Mn) doping due to the lower formation energy and lattice stabilization, the MnO/hcp Ni surface promotes the HER via intrinsic favorable H2O adsorption and fast dissociation kinetics. Consequently, the Mn-doped hcp Ni electrocatalyst shows a small overpotential of 80 mV at 10 mA/cm(2) and a low Tafel slope of 68 mV/dec. The result is even approaching that of the commercial Pt/C, being one of the best reported non-noble metal HER electrocatalysts in alkaline media. Under long-term chronopotentiometry measurement, such electrocatalyst can endure at least 10 h with negligible activity decay and structure change. The present work demonstrates the dimension in boosting the electrocatalysis by doping engineering of metastable electrocatalysts.

文章链接：

https://pubs.acs.org/doi/10.1021/acsnano.8b06896

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