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Atomic-Layer-Deposited Ultrathin Co9S8 on Carbon Nanotubes: an Efficient Bifunctional Electrocatalyst for Oxygen Evolution/Reduction Reactions and Rechargeable Zn-Air Batteries

Abstract

Oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) are the key processes in many renewable energy conversion systems, and the development of high-performance non-precious bifunctional OER/ORR electrocatalysts is of crucial importance for various energy conversion devices, such as rechargeable metal-air batteries and regenerative fuel cells. Herein, we report a novel efficient bifunctional OER/ORR catalyst of Co9S8/CNT, which is synthesized by an advanced technique of atomic layer deposition (ALD) for conformally coating a uniform thin layer of Co9S8 on a high-surface-area carbon-nanotube (CNT) network scaffold. The ALD-synthesized Co9S8/CNT catalyst displays remarkable electrocatalytic performance with excellent catalytic activity and stability toward both OER and ORR, and is further demonstrated as a superior bifunctional oxygen catalyst for high-performance rechargeable Zn-air batteries. The fabricated aqueous rechargeable Zn-air batteries are able to deliver a remarkably high power density with superior long-term cycling stability, and the fabricated solid-state rechargeable Zn-air batteries are able to display very good flexibility and stability upon bending. Therefore, we believe that the ALD-synthesized bifunctional Co9S8/CNT electrocatalyst will have broad and promising applications for renewable energy conversion devices.

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Publication details

The article was received on 17 Jul 2017, accepted on 13 Sep 2017 and first published on 14 Sep 2017


Article type: Paper
DOI: 10.1039/C7TA06243E
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Atomic-Layer-Deposited Ultrathin Co9S8 on Carbon Nanotubes: an Efficient Bifunctional Electrocatalyst for Oxygen Evolution/Reduction Reactions and Rechargeable Zn-Air Batteries

    H. Li, Z. Guo and X. Wang, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA06243E

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