双功能
X射线吸收光谱法
电催化剂
催化作用
析氧
钴
氧化钴
纳米颗粒
化学
无机化学
克拉克电极
粒径
吸收光谱法
氧化物
材料科学
化学工程
纳米技术
电极
电化学
有机化学
物理化学
工程类
物理
电解质
量子力学
作者
Bora Seo,Young Jin,Jinwoo Woo,Kyungjung Kwon,Jong Hyun Park,Tae Joo Shin,Hu Young Jeong,Sang Hoon Joo
标识
DOI:10.1021/acscatal.6b00553
摘要
Bifunctional oxygen electrocatalysts play a vital role in important energy conversion and storage devices. Cost-effective, abundant, and active Co-based materials have emerged as promising bifunctional electrocatalysts for which identifying catalytically active structures under reaction conditions and unraveling the structure–activity relationships are of critical importance. Here, we report the size-dependent (3–10 nm) structure and catalytic activity of bifunctional cobalt oxide nanoparticle (CoOx NP) catalysts for the oxygen evolution reaction (OER) and the oxygen reduction reaction (ORR). In situ X-ray absorption spectroscopy (XAS) revealed that the majority of NPs during OER and ORR were composed of the Co3O4 and CoOOH phases regardless of their particle sizes. The OER activity increased with decreasing NP size, which correlated to the increased oxidation state and larger surface area in smaller NPs, whereas the ORR activity was nearly independent of NP size. These particle size-dependent catalytic activities in conjunction with the in situ XAS results can provide insights into the CoOx-catalyzed bifunctional oxygen electrode reactions.
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