Development of Highly Active Bifunctional Electrocatalyst Using CoO on Carbon Nanotubes for Oxygen Reduction and Oxygen Evolution

Overview

Journal Sci Rep

Specialty Science

Date 2018 Feb 9

PMID 29416089

Citations 13

Authors

Mohammad Shamsuddin Ahmed

Byungchul Choi

Young-Bae Kim

Affiliations

Soon will be listed here.

Abstract

Replacement of precious platinum catalyst with efficient and cheap bifunctional alternatives would be significantly beneficial for electrocatalytic oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) and the application of these catalysts in fuel cells is highly crucial. Despite numerous studies on electrocatalysts, the development of bifunctional electrocatalysts with comparatively better activity and low cost remains a big challenge. In this paper, we report a nanomaterial consisting of nanocactus-shaped CoO grown on carbon nanotubes (CoO/CNTs) and employed as a bifunctional electrocatalyst for the simultaneous catalysis on ORR, and OER. The CoO/CNTs exhibit superior catalytic activity toward ORR and OER with the smallest potential difference (0.72 V) between the [Formula: see text] (1.55 V) for OER and E (0.83 V) for ORR. Thus, CoO/CNTs are promising high-performance and cost-effective bifunctional catalysts for ORR and OER because of their overall superior catalytic activity and stability compared with 20 wt% Pt/C and RuO, respectively. The superior catalytic activity arises from the unique nanocactus-like structure of CoO and the synergetic effects of CoO and CNTs.

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