Journal
RARE METALS
Volume 41, Issue 8, Pages 2606-2615Publisher
NONFERROUS METALS SOC CHINA
DOI: 10.1007/s12598-022-02003-3
Keywords
Ru-decorated; NiFe hydroxide; Electronic interaction; Electrocatalyst; Oxygen evolution reaction (OER)
Funding
- National Natural Science Foundation of China [12074435, 51871250, 52001335]
- Science and Technology Innovation Program of Hunan Province [2021RC4001]
- State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metal [SKL-SPM-202005]
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A high-efficiency electrocatalyst of ruthenium-decorated nickel-iron hydroxide (10Ru-NiFe LDH) was synthesized for oxygen evolution reaction (OER). The 10Ru-NiFe LDH showed fast OER kinetics with a small overpotential and high stability, attributed to the increased active sites and synergistic electronic interactions.
The efficiency of electrochemical water splitting is extremely hampered by the sluggish oxygen evolution reaction (OER) occurred at the anode. Therefore, developing high-performance OER electrocatalysts is crucial for realizing the industrialized application of water splitting. Herein, a high-efficiency electrocatalyst of ruthenium-decorated nickel-iron hydroxide (10Ru-NiFe LDH) supported on Ni foam is successfully synthesized for OER. Modifying NiFe LDH with ruthenium can optimize the electronic density to form high valences of metal sites, which is beneficial to promote its OER performance. Consequently, the 10Ru-NiFe LDH only needs a low overpotential of 222 mV to achieve a current density of 50 mA center dot cm(-2), which exhibits fast OER kinetics with a small Tafel slope of 58 mV center dot dec(-1). Moreover, this electrocatalyst shows high stability over 20 h at a high current density of 100 mA center dot cm(-2 )without obvious decay. The decent OER performances can be ascribed to the increased active sites and the synergistic electronic interactions among Ni, Fe and Ru. This work provides an effective approach for designing desirable electrocatalysts for OER.
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