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Mo Doping Induced Ni Surface Enrichment of Porous Spherical Core-Shell Bifunctional Electrocatalyst for Overall Water
Zhipeng Liu1, Jinling Xue1, Yibin Fan2
1Key Laboratory of Thermo-Fluid Science and Engineering of Ministry of Education, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, China.
A novel Ni-enriched core-shell catalyst efficiently splits water using non-noble metals. This bifunctional catalyst demonstrates superior performance for oxygen and hydrogen evolution reactions, advancing hydrogen energy technology.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Developing efficient non-noble metal bifunctional catalysts is crucial for alkaline overall water splitting (OWS) and hydrogen energy.
- Optimizing catalyst structure to enhance intrinsic activity is a key strategy.
Purpose of the Study:
- To prepare and characterize a novel Ni-enriched core-shell structured catalyst for enhanced OWS performance.
- To evaluate the electrocatalytic activity of the Ni3Co3Mo100-BTC-15h catalyst for both oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in alkaline media.
Main Methods:
- Hydrothermal synthesis of Ni3Co3Mo100-BTC-15h catalyst with a Ni-enriched core-shell porous structure.
- Electrocatalytic performance testing for OER and HER in alkaline solution.
- Evaluation of the catalyst's bifunctional performance in an alkaline electrolyzer for OWS.
Main Results:
- The Ni3Co3Mo100-BTC-15h catalyst exhibited a unique Ni-enriched core-shell porous structure.
- Achieved low overpotentials of 151 mV for OER and ~136 mV for HER, outperforming commercial catalysts.
- Demonstrated a competitive cell voltage of 1.62 V at 10 mA·cm-2 for OWS, comparable to Pt/C and RuO2.
Conclusions:
- The Ni-enriched core-shell structure significantly enhances the bifunctional electrocatalytic activity for OWS.
- This work presents a viable strategy for designing high-performance non-noble metal catalysts for hydrogen production.
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