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A Novel Ball-in-ball Hollow Oxygen-incorporating Cobalt Sulfide Spheres as High-efficient Electrocatalyst for Oxygen Evolution Reaction by Yurong Li; Qifei Guo; Yimin Jiang; Wei Shen; Ming Li; Rongxing He is a Chemistry article available to read on EtoBox.

What is A Novel Ball-in-ball Hollow Oxygen-incorporating Cobalt Sulfide Spheres as High-efficient Electrocatalyst for Oxygen Evolution Reaction about?

Transition-metal chalcogenides with hollow nanostructure, especially cobalt sulfides, are considered as the most promising non-precious metal catalysts for oxygen evolution reaction. However, it is difficult to synthesize oxygen-containing cobalt sulphides with hollow structure due to the different physical/chemical properties between metal sulfides and metal cobalts. Herein, we report a novel oxygen-containing amorphous cobalt sulfide ball-in-ball hollow spheres (Co-S-O BBHS) synthesized by an anion exchange method. Taking advantage of the ball-in-ball hollow structure, the amorphous Co-S-O BBHS shows superior oxygen evolution reaction (OER) electrocatalytic performance with a low overpotential of 285 mV at 10 mA/cm2, small Tafel slope of 49.67 mV/dec, high Faraday efficiency of 96%, and satisfied durability. Experiments and DFT calculations demonstrate that the introduction of oxygen and sulfur modulates the electronic structure of Co-S-O BBHS, thus enhancing the adsorption of *O (adsorbed O species on catalyst surface) intermediate, which greatly boosts the catalytic activity towards OER. This work provides a new strategy for controllable synthesis of complex hollow structures o

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Author

Yurong Li; Qifei Guo; Yimin Jiang; Wei Shen; Ming Li; Rongxing He

Publisher

Elsevier BV

Published

2021

Language

EN

Field

Chemistry (Physical Sciences)