In:
ChemSusChem, Wiley, Vol. 11, No. 9 ( 2018-05-09), p. 1479-1485
Abstract:
Exploring efficient and cheap oxygen evolution reaction (OER) electrocatalysts is of great significance for electrochemical water splitting. Herein, we successfully prepared an efficient ternary electrocatalyst of porous cobalt oxynitride (Co 3 O x N y ) nanosheets by a simple nitridation strategy. Specifically, CoON PNS‐400 (cobalt oxynitride with porous nanosheet structure obtained at 400 o C) offered a low OER overpotential of 0.23 V to achieve the catalytic current density of 10 mA cm −2 and a small Tafel slope of 48 mV dec −1 in alkali media, outperforming most of the first‐row transition‐metal‐based OER electrocatalysts. The calculated density of states (DOS) analysis and electron spin resonance (ESR) measurements revealed that the introduction of foreign N atoms into pristine Co 3 O 4 nanosheets can optimize the electronic structure and create more oxygen vacancies, thus leading to enhanced electrical conductivity. Density functional theory (DFT) calculations demonstrated that the foreign N atoms can also improve the energetics for OER by modulating the free energy for adsorbed intermediates (OOH*, OH*, O*), further improving the OER electrocatalytic activity of CoON PNS‐400. This work provides a possibility for rationally designing ternary transition‐metal compounds as advanced OER electrocatalysts.
Type of Medium:
Online Resource
ISSN:
1864-5631
,
1864-564X
DOI:
10.1002/cssc.201800380
Language:
English
Publisher:
Wiley
Publication Date:
2018
detail.hit.zdb_id:
2411405-4
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