Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 4, Issue 9, Pages 3210-3216Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ta00328a
Keywords
10.1039/c6ta00328a
Funding
- Natural Scientific Foundation of China [21306102, 21422604]
- Tsinghua University Initiative Scientific Research Program [2014z22076]
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Multi-metallic (oxy) hydroxide materials are some of the most promising alternatives for superb water oxidation electrocatalysts. Herein, a series of graphene/NiFe (oxy) hydroxides were fabricated to investigate the role of the Fe/Ni ratio in regard to the resultant physical structures, decoration styles, and combined catalytic activities. With the Fe content increasing, a phase evolution from Fe doped Ni(OH)(2)/NiO(OH) to Ni doped FeO(OH) was demonstrated. The moderate guest-metal substitution into the host-oxyhydroxide framework (Fe into Ni or Ni into Fe) substantially enhanced the oxygen evolution activity with a decrease in both the Tafel slope and overpotential. In addition, the NiO(OH) and FeO(OH) frameworks exhibited distinct properties and performances for the oxygen evolution reaction due to the different metal-oxygen bond lengths and adsorption energies of the intermediates.
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