材料科学
电催化剂
双功能
过电位
磷化物
量子点
催化作用
分解水
石墨烯
三元运算
纳米片
氧化物
镍
钴
电化学
双金属片
纳米技术
无机化学
化学工程
金属
电极
光催化
化学
冶金
物理化学
生物化学
程序设计语言
工程类
计算机科学
作者
Jingqi Tian,Jie Chen,Jiyang Liu,Qinghua Tian,Peng Chen
出处
期刊:Nano Energy
[Elsevier BV]
日期:2018-03-27
卷期号:48: 284-291
被引量:170
标识
DOI:10.1016/j.nanoen.2018.03.063
摘要
Graphene quantum dot (GQD) is the most recent addition to the nanocarbon materials family which promises a wide spectrum of novel applications. On the other hand, bimetallic phosphides are emerging for their unique potentials for electrocatalysis. Herein, we have demonstrated the fabrication of heterostructured nanosheet arrays of ternary nickel-cobalt phosphide (NiCo2P2) and GQD hybrid (NCP/G NSs) and the use as bifunctional catalysts for overall water splitting in alkaline medium. NCP/G NSs exhibit excellent electrocatalytic activity towards hydrogen evolution reaction (reaching 100 mA cm−2 at an extremely low overpotential of 119 mV), superior to any other non-noble metal catalyst. Furthermore, an electrolyzer equipped with two identical NCP/G NS electrodes at an exceptionally small amount of catalyst loading (0.31 mg cm−2) is able to achieve efficient overall water splitting (10 mA cm−2 at 1.61 V) with high stability. The careful comparison with NiCo2P2 nanowires (NCP NWs) synthesized under the same conditions without GQDs (in terms of electrocatalytic performance, atomic and electronic structures, and electrochemical properties) reveals the mechanistic roles of GQDs in morphology control and performance enhancement. In addition, the performance comparison with ternary nickel-cobalt oxide (NiCo2O4) and GQD hybrid (NCO/G NSs) suggests the advantage of bimetallic phosphides over oxide counterparts.
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