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Activating lattice oxygen in NiFe-based (oxy)hydroxide for water electrolysis
Zuyun He1, Jun Zhang2, Zhiheng Gong1
1School of Environment and Energy, State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, Guangdong, 510006, China.
Nature Communications
|April 22, 2022
Summary
This study introduces Mo-doped NiFe (oxy)hydroxide as a superior electrocatalyst for the oxygen evolution reaction (OER). Modulating lattice oxygen activity enhances catalytic performance for energy applications.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Transition metal oxides and (oxy)hydroxides are key electrocatalysts for energy and environmental applications.
- Lattice oxygen in these materials has recently been recognized for its active role in surface reactions.
Purpose of the Study:
- To synthesize Mo-doped NiFe (oxy)hydroxide with controlled oxygen activity.
- To enhance electrocatalyst performance for the oxygen evolution reaction (OER).
Main Methods:
- Sacrificial template-directed synthesis of Mo-doped NiFe (oxy)hydroxide.
- Density functional theory (DFT) calculations.
- Advanced spectroscopy techniques.
Main Results:
- MoNiFe (oxy)hydroxide achieved a high mass activity of 1910 A/gmetal at 300 mV overpotential.
- Mo doping upshifted the O 2p band and weakened the metal-oxygen bond.
- Facilitated oxygen vacancy formation and altered OER reaction pathway.
Conclusions:
- Lattice oxygen plays a crucial role in the activity of (oxy)hydroxide electrocatalysts.
- Tuning oxygen activity is a viable strategy for developing highly active electrocatalysts.
- Mo-doped NiFe (oxy)hydroxide shows significant potential for OER applications.
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