In:
Inorganic Chemistry Frontiers, Royal Society of Chemistry (RSC), Vol. 10, No. 19 ( 2023), p. 5668-5677
Abstract:
The development of high-performance metallic cobalt pyrite OER catalysts with suitable electronic structures remains a challenge. In this paper, a low-electronegative Fe-substituted cobalt pyrite (Fe x Co 1− x )S 2 OER catalyst with controllable morphology and electronic structure was designed and prepared, and it exhibited excellent catalytic activity owing to the conversion of (Fe x Co 1− x )S 2 to Fe–CoOOH during the OER process. Benefiting from the morphology of porous nanospheres and the modulated electronic structure, Fe 0.25 Co 0.75 OOH exhibits an OER overpotential of 274 mV and a Tafel slope of 33.6 mV dec −1 at a current density of 10 mA cm −2 . Experimental and theoretical calculation methods show that the introduction of Fe into CoOOH can modulate the d-band center of the Co site because the low electronegativity of Fe induces charge aggregation at the Co site to optimize the binding energy between Co and oxygen-containing intermediates. This study provides prospective insights into understanding the synergistic effects of bimetals in the (Fe x Co 1− x )S 2 system and offers a new strategy for exploring other efficient catalysts with controllable electronic structures and controllable morphologies.
Type of Medium:
Online Resource
ISSN:
2052-1553
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2023
