Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 9, Issue 12, Pages 7586-7593Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ta00693b
Keywords
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Funding
- NSFC [21673093, 21673094]
- Science and Technology Research Program of Education Department of Jilin Province [JJKH20190121KJ]
- Natural Science Foundation of Fujian Province [2020J01147]
- Startup Fund for High-level Talent at Fujian Normal University
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The study introduces K2Fe4O7 nanocrystals grown on a nickel foam as an electrocatalyst for hydrogen and oxygen evolution reactions, demonstrating excellent stability and high current densities. The nano-KFO material shows promising potential for large-scale hydrogen production due to its efficient electrocatalytic performance in water splitting.
Developing new electrocatalysts with high activity and good stability for hydrogen evolution reactions (HER) and oxygen evolution reactions (OER), in particular superhydrophilic ones that can significantly enhance mass transfer between electrodes and electrolytes at high current densities, remains a challenge. Herein, we report that K2Fe4O7 nanocrystals (nano-KFO) are hydrothermally grown on a nickel foam (NF). The formed nano-KFO/NF exhibits good stability and delivers an extremely large current density up to 2000 mA cm(-2) at low overpotentials of 343 mV (HER) and 421 mV (OER) in 1.0 M KOH electrolyte. By employing nano-KFO/NF as both cathode and anode, a water electrolyzer can operate over 60 hours at a current density of 1500 mA cm(-2) with cell voltages of 2.01 V in 1.0 M KOH and 1.89 V in 10.0 M KOH, demonstrating the great potential of this bifunctional electrocatalyst for large-scale hydrogen production. Our theoretical calculation reveals that the structure has instinct high catalytic activities for both HER and OER in alkaline media. In addition, the large surface area, good conductivity, and inherent superhydrophilic properties of nano-KFO lead to its highly efficient electrocatalytic water splitting performance.
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