电催化剂
材料科学
氮气
纳米技术
过渡金属
氮化物
金属
化学物理
电极
化学
催化作用
物理化学
电化学
有机化学
冶金
生物化学
图层(电子)
作者
Huanyu Jin,Xin Liu,Anthony Vasileff,Yan Jiao,Yongqiang Zhao,Yao Zheng,Shi Zhang Qiao
出处
期刊:ACS Nano
[American Chemical Society]
日期:2018-11-29
卷期号:12 (12): 12761-12769
被引量:354
标识
DOI:10.1021/acsnano.8b07841
摘要
Transition metal nitrides (TMNs) have great potential for energy-related electrocatalysis because of their inherent electronic properties. However, incorporating nitrogen into a transition metal lattice is thermodynamically unfavorable, and therefore most of the developed TMNs are deficient in nitrogen. Consequently, these TMNs exhibit poor structural stability and unsatisfactory performance for electrocatalytic applications. In this work, we design and synthesize an atomically thin nitrogen-rich nanosheets, Mo5N6, with the help of a Ni-inducing growth method. The as-prepared single-crystal electrocatalyst with abundant metal-nitrogen electroactive sites displays outstanding activity for the hydrogen evolution reaction (HER) in a wide range of electrolytes (pH 0-14). Further, the two-dimensional Mo5N6 nanosheets exhibit high HER activity and stability in natural seawater that are superior to other TMNs and even the Pt benchmark. By combining synchrotron-based spectroscopy and the calculations of electron density of state, we find that the enhanced properties of these nitrogen-rich Mo5N6 nanosheets originates from its Pt-like electronic structure and the high valence state of its Mo atoms.
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