Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7725037 | Journal of Power Sources | 2018 | 8 Pages |
Abstract
Metal organic frameworks (MOFs) based catalysts are the most promising candidates for electrocatalytic reaction. Herein, we describe a fast, cost-effective and efficient method to construct an oxygen evolution electrocatalyst with a “bivalve hollow nanoellipsoid” structure, namely three dimensional (3D) bi-shells Co9S8/Fe3O4 embedded in S/N co-decorated hollow carbon nanoellipsoid (H-Co9S8/Fe3O4@SNC). The bivalve metallic compounds hollow structure decreases the proton-electron transfer kinetics on carbon nanoellipsoid, and promoting the oxygen evolution reaction (OER). Specifically, the H- Co9S8/Fe3O4@SNC reveals an excellent catalytic activity with a low overpotential of 280â¯mVâ¯at the current density of 10â¯mAâ¯cmâ2 and a small Tafel slope of 87â¯mV decâ1. Moreover, this H-Co9S8/Fe3O4@SNC electrode is applied to rotating ring-disk electrode (RRDE) and show remarkable catalytic stability and give â¼97.5% Faradic efficiency toward OER via chronoamperometric measurement at a rotation rate of 1600â¯rpm. Following that, the mechanism is investigated and reveal the excellent catalytic activity is mainly owed to the hollow structure and the catalytic synergistic effects of the double shell Co9S8/Fe3O4, simultaneously, the introduction of oxygen vacancy during the pyrolysis process to the formation of Fe3O4.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Lang Gan, Jing Fang, Mengran Wang, Langtao Hu, Kai Zhang, Yanqing Lai, Jie Li,