双金属片
催化作用
电化学
化学
金属有机骨架
金属
背景(考古学)
纳米技术
化学工程
材料科学
电极
物理化学
有机化学
古生物学
吸附
工程类
生物
作者
Hajin Yoon,Sujeong Lee,Sojin Oh,Heejun Park,Soo Hyuk Choi,Moonhyun Oh
出处
期刊:Small
[Wiley]
日期:2019-04-01
卷期号:15 (17)
被引量:97
标识
DOI:10.1002/smll.201805232
摘要
The development of new electrocatalysts for electrochemical oxygen reduction to replace expensive and rare platinum-based catalysts is an important issue in energy storage and conversion research. In this context, conductive and porous metal-organic frameworks (MOFs) are considered promising materials for the oxygen reduction reaction (ORR) due to not only their high surface area and well-developed pores but also versatile structural features and chemical compositions. Herein, the preparation of bimetallic conductive 2D MOFs (Cox Niy -CATs) are reported for use as catalysts in the ORR. The ratio of the two metal ions (Co2+ and Ni2+ ) in the bimetallic Cox Niy -CATs is rationally controlled to determine the optimal composition of Cox Niy -CAT for efficient performance in the ORR. Indeed, bimetallic MOFs display enhanced ORR activity compared to their monometallic counterparts (Co-CAT or Ni-CAT). During the ORR, bimetallic Cox Niy -CATs retain an advantageous characteristic of Co-CAT in relation to its high diffusion-limiting current density, as well as a key advantage of Ni-CAT in relation to its high onset potential. Moreover, the ORR-active bimetallic Cox Niy -CAT with excellent ORR activity is prepared at a large scale via a convenient method using a ball-mill reactor.
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