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Exploiting Lattice Carbon-Induced Modulation Effect in Nickel towards Efficient Alkaline Hydrogen Oxidation
Jian He1, Liu Luo1, Jinchi Li1
1Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu, 610041, China.
Angewandte Chemie (International Ed. in English)
|January 13, 2025
Summary
Controlling lattice carbon (LC) content in nickel (Ni) catalysts fine-tunes their electronic structure. Optimized LC content in Ni enhances alkaline hydrogen oxidation reaction (HOR) performance by optimizing binding energies.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Non-metallic heteroatom doping is known to enhance nickel's (Ni) catalytic performance for the alkaline hydrogen oxidation reaction (HOR).
- The specific influence of lattice carbon (LC) on Ni's HOR activity and the relationship between LC content and catalytic performance remain underexplored.
Purpose of the Study:
- To investigate the effect of lattice carbon (LC) content on the electronic structure and hydrogen oxidation reaction (HOR) activity of nickel (Ni) catalysts.
- To establish a quantitative relationship between LC doping levels and HOR catalytic performance.
Main Methods:
- Utilizing hydrogen as a scavenger to precisely control LC content in Ni during pyrolytic reduction.
- Characterizing the electronic structure changes from Ni3C-like to quasi-Ni as LC is removed.
- Evaluating HOR catalytic activity in an alkaline environment.
Main Results:
- A novel volcanic relationship between LC content and Ni's HOR activity was established.
- The Cless-Ni (LC0.44-Ni) catalyst with an optimized LC content exhibited superior HOR activity.
- Optimized activity is attributed to weakened hydrogen binding energy (HBE) and optimal hydroxyl binding energy (OHBE).
Conclusions:
- Lattice carbon (LC) doping offers a tunable parameter for optimizing nickel (Ni) catalyst performance in the hydrogen oxidation reaction (HOR).
- Precisely controlling LC content is crucial for achieving enhanced catalytic activity.
- This study provides a new strategy for designing high-performance electrocatalysts by manipulating metal electronic structures through LC doping.
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