共轭体系
共价键
氧还原反应
铂纳米粒子
催化作用
化学
材料科学
还原(数学)
氧还原
氧气
氧化还原
组合化学
铂金
纳米颗粒
纳米技术
光化学
电化学
有机化学
聚合物
物理化学
电极
数学
几何学
作者
Lipeng Zhai,Shuai Yang,Xiubei Yang,Wanyu Ye,Jing Wang,Weihua Chen,Yu Guo,Liwei Mi,Zijie Wu,C. Soutis,Qing Xu,Zheng Jiang
标识
DOI:10.1021/acs.chemmater.0c03614
摘要
Developing highly efficient and durable electrocatalysts for the oxygen reduction reaction (ORR) is essential for commercializing renewable and clean energy, but this remains a challenge. Herein, we design an electrocatalyst by confining Pt nanoparticles on a conjugated nitrogen-rich covalent organic framework (COF) and demonstrate its ORR activity in an acid electrolyte. In the catalyst, multiple pyridinic nitrogens act as nucleation sites for controllably growing Pt in a layer over the COF's surface and the pore channel, resulting in uniform Pt distribution and more accessible Pt active sites. The catalyst exhibits ultrahigh ORR activity with an onset potential of 1.05 V versus reversible hydrogen electrode and a half-wave potential of 0.89 V, which are more positive than those of commercial Pt/C and other reported catalysts. This strategy offers a new way to fabricate electrocatalysts with atomically definite active sites and high-performance catalytic activities for clean energy storage and conversion.
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