过电位
材料科学
塔菲尔方程
电催化剂
分解水
析氧
过渡金属
镍
MXenes公司
双金属
化学工程
氢氧化物
纳米技术
催化作用
电化学
物理化学
冶金
电极
化学
工程类
光催化
生物化学
作者
Cheng‐Feng Du,Khang Ngoc Dinh,Qinghua Liang,Yun Zheng,Yubo Luo,Jianli Zhang,Qingyu Yan
标识
DOI:10.1002/aenm.201801127
摘要
Abstract Herein, the authors present the development of novel 0D–2D nanohybrids consisting of a nickel‐based bimetal phosphorus trisulfide (Ni 1− x Fe x PS 3 ) nanomosaic that decorates on the surface of MXene nanosheets (denoted as NFPS@MXene). The nanohybrids are obtained through a facile self‐assemble process of transition metal layered double hydroxide (TMLDH) on MXene surface; followed by a low temperature in situ solid‐state reaction step. By tuning the Ni:Fe ratio, the as‐synthesized NFPS@MXene nanohybrids exhibit excellent activities when tested as electrocatalysts for overall water splitting. Particularly, with the initial Ni:Fe ratio of 7:3, the obtained Ni 0.7 Fe 0.3 PS 3 @MXene nanohybrid reveals low overpotential (282 mV) and Tafel slope (36.5 mV dec −1 ) for oxygen evolution reaction (OER) in 1 m KOH solution. Meanwhile, the Ni 0.9 Fe 0.1 PS 3 @MXene shows low overpotential (196 mV) for the hydrogen evolution reaction (HER) in 1 m KOH solution. When integrated for overall water splitting, the Ni 0.7 Fe 0.3 PS 3 @MXene || Ni 0.9 Fe 0.1 PS 3 @MXene couple shows a low onset potential of 1.42 V and needs only 1.65 V to reach a current density of 10 mA cm −2 , which is better than the all noble metal IrO 2 || Pt/C electrocatalyst (1.71 mV@10 mA cm −2 ). Given the chemical versatility of Ni 1− x Fe x PS 3 and the convenient self‐assemble process, the nanohybrids demonstrated in this work are promising for energy conversion applications.
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