In:
Journal of Materials Chemistry A, Royal Society of Chemistry (RSC), Vol. 10, No. 40 ( 2022), p. 21512-21522
Abstract:
The optimal oxidation state and electronic structure of active sites in an electrocatalyst are critical factors for maximizing water-oxidation kinetics. To this end, we developed a heterostructured electrocatalyst for oxygen evolution reaction (OER) comprising La 0.5 Sr 0.5 CoO 3− δ and Li 2 MoO 4 (LSC/LMO) with optimized oxidation states for active metal sites using an alkali metal mediator. The LSC/LMO system exhibited excellent OER performance (overpotential: 1.45 V at 10 mA cm −2 ) and operational durability (chronoamperometric and cyclic voltammetry stabilities of 200 h at 1.52 V and 5000 cycles). The experimental and computational analyses revealed that lithium atoms accumulated at the LSC/LMO interface exhibit a mediating function toward optimizing the oxidation state and electronic structure of OER active metal elements (cobalt and molybdenum), minimizing the free energy barrier of the rate-determining step in OER. This study provides a new insight for boosting sluggish OER kinetics in water oxidation through in situ oxidation state modulation for heterostructured electrocatalysts.
Type of Medium:
Online Resource
ISSN:
2050-7488
,
2050-7496
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2022
detail.hit.zdb_id:
2702232-8
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