articleNature CommunicationsApr 4, 2023GOLD OA

Regulating electronic states of nitride/hydroxide to accelerate kinetics for oxygen evolution at large current density

Dalian University of Technology · Dalian University · +2 more institutions

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Abstract

Abstract Rational design efficient transition metal-based electrocatalysts for oxygen evolution reaction (OER) is critical for water splitting. However, industrial water-alkali electrolysis requires large current densities at low overpotentials, always limited by intrinsic activity. Herein, we report hierarchical bimetal nitride/hydroxide (NiMoN/NiFe LDH) array as model catalyst, regulating the electronic states and tracking the relationship of structure-activity. As-activated NiMoN/NiFe LDH exhibits the industrially required current density of 1000 mA cm −2 at overpotential of 266 mV with 250 h stability for OER. Especially, in-situ electrochemical spectroscopic reveals that heterointerface facilitates…

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495
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Authors

7

Topics & keywords

Keywords
  • Oxygen evolution
  • Overpotential
  • Water splitting
  • Alkaline water electrolysis
  • Materials science
  • Electrolysis of water
  • Hydroxide
  • Dielectric spectroscopy
UN Sustainable Development Goals
  • Clean water and sanitation
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