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Boosting cascade electron transfer in NiFe oxyhydroxide for overall water splitting.
- Source :
-
Applied Physics Letters . 2/12/2024, Vol. 124 Issue 7, p1-8. 8p. - Publication Year :
- 2024
-
Abstract
- Nickel–iron oxyhydroxides are among the most active electrocatalysts, but their sluggish kinetic of oxygen evolution reaction (OER) limits the energy efficiency toward overall water splitting. Here, we present a "cascade electron transfer" strategy through spurring unidirectional electron transfer among different metal sites in Mn-doped FeNiOOH@FeNiP to boost OER and overall water splitting. The Mn doping induces a cascade electron transfer from Ni to Fe and then to Mn via metal-O-metal bridge, thus promoting the oxidation Ni and Fe centers, which in turn help charge transfer by increasing the covalency between metal-O bonds to optimize the bonding strength between metal and adsorbed oxygen species. Consequently, the optimal Mn–FeNiOOH@FeNiP delivers a fast OER kinetics (32.1 mV dec−1) along with a low overpotential of 215 mV@10 mA cm−2. Benefiting from the synergistic effect of high conductivity, large specific surface area, and favorable OER kinetics, the catalyst only requires a low cell voltage of 1.456 V to achieve 20 mA cm−2 for overall water splitting, superior to that of a commercial RuO2ǁPt/C catalyst. [ABSTRACT FROM AUTHOR]
- Subjects :
- *CHARGE exchange
*OXYGEN evolution reactions
*CHARGE transfer
*ENERGY consumption
Subjects
Details
- Language :
- English
- ISSN :
- 00036951
- Volume :
- 124
- Issue :
- 7
- Database :
- Academic Search Index
- Journal :
- Applied Physics Letters
- Publication Type :
- Academic Journal
- Accession number :
- 175501744
- Full Text :
- https://doi.org/10.1063/5.0197209