材料科学
析氧
电催化剂
催化作用
纳米颗粒
Crystal(编程语言)
纳米材料
晶体结构
电解质
化学工程
立方晶系
相(物质)
碳纤维
可逆氢电极
合金
纳米技术
结晶学
电极
电化学
物理化学
化学
冶金
工作电极
复合数
复合材料
有机化学
计算机科学
工程类
程序设计语言
作者
Changhong Wang,Hongchao Yang,Yejun Zhang,Qiangbin Wang
标识
DOI:10.1002/anie.201902446
摘要
Abstract Tuning the crystal phase of metal alloy nanomaterials has been proved a significant way to alter their catalytic properties based on crystal structure and electronic property. Herein, we successfully developed a simple strategy to controllably synthesize a rare crystal structure of hexagonal close‐packed (hcp) NiFe nanoparticle (NP) encapsulated in a N‐doped carbon (NC) shell (hcp‐NiFe@NC). Then, we systemically investigated the oxygen evolution reaction (OER) performance of the samples under alkaline conditions, in which the hcp‐NiFe@NC exhibits superior OER activity compared to the conventional face‐centered cubic (fcc) NiFe encapsulated in a N‐doped carbon shell (fcc‐NiFe@NC). At the current densities of 10 and 100 mA cm −2 , the hcp‐NiFe@NC with Fe/Ni ratio of ≈5.4 % only needs ultralow overpotentials of 226 mV and 263 mV versus reversible hydrogen electrode in 1.0 m KOH electrolyte, respectively, which were extremely lower than those of fcc‐NiFe@NC and most of other reported NiFe‐based electrocatalysts. We proposed that hcp‐NiFe possesses favorable electronic property to expedite the reaction on the NC surface, resulting higher catalytic activity for OER. This research provides a new insight to design more efficient electrocatalysts by considering the crystal phase correlated electronic property.
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