材料科学
析氧
石墨烯
催化作用
镍
分解水
钼
过渡金属
碳纳米管
化学工程
碳化物
电催化剂
纳米技术
电极
光催化
冶金
化学
电化学
物理化学
有机化学
工程类
作者
Debanjan Das,Saswati Santra,Karuna Kar Nanda
标识
DOI:10.1021/acsami.8b09941
摘要
Despite the recent promise of transition metal carbides as nonprecious catalysts for the hydrogen evolution reaction (HER), their extension to the oxygen evolution reaction (OER) to achieve the goal of overall water splitting remains a significant challenge. Herein, a new Ni/Mo xC (MoC, Mo2C) nanoparticle-supported N-doped graphene/carbon nanotube hybrid (NC) catalyst is developed via a facile, one-step integrated strategy, which can catalyze both the HER and OER in an efficient and robust manner. The catalyst affords low overpotentials of 162 and 328 mV to achieve a current density of 10 mA/cm2 for HER and OER, respectively, in alkaline medium, which either compares favorably or exceeds most of the Mo-based catalysts documented in the literature. It is believed that there is an electronic synergistic effect among Mo xC, Ni, and NC, wherein a tandem electron transfer process (Ni → Mo xC → NC) may be responsible for promoting the HER as well as OER activity. This work opens a new avenue toward the development of multicomponent, highly efficient but inexpensive electrocatalysts for overall water splitting.
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