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Operando Reconstruction of NiB Precatalyst Into Adaptive Heterointerfaces for CO2 Photoreduction via Tandem Hydrogen
Qin Ren1, Xingtao Sun2, Fengyi Zhong3
1Research Center for Carbon-Neutral Environmental & Energy Technology, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China Chengdu, China Chengdu, P. R. China.
Researchers developed a new nickel boride catalyst for efficient carbon dioxide (CO2) reduction. This catalyst dynamically reconstructs to enhance CO2 conversion, offering a promising carbon neutrality technology.
Area of Science:
- Materials Science
- Catalysis
- Renewable Energy
Background:
- Photocatalytic CO2 reduction is key for carbon neutrality but faces challenges with competing reactions like H2 evolution.
- Existing catalysts often have static surfaces, limiting efficiency.
Purpose of the Study:
- To explore crystalline nickel boride (NiB) as a novel photocatalyst for CO2 reduction.
- To understand the dynamic interfacial reconstruction mechanism during photocatalysis.
Main Methods:
- Operando characterization of NiB under illumination.
- Analysis of reaction pathways and interfacial dynamics.
- Quantification of CO2 reduction and H2 evolution rates.
Main Results:
- NiB spontaneously reconstructs into adaptive Ni/B2O3/NiB heterointerfaces.
- A tandem hydrogen relay mechanism (H2O→H2→H*) facilitates CO2 activation and hydrogenation.
- Achieved a CO evolution rate of 4.5 mmol·g−1·h−1, an order of magnitude higher than previous systems.
Conclusions:
- Crystalline transition-metal borides are a promising new platform for photocatalytic CO2 reduction.
- Reaction-driven interfacial reconstruction can overcome competing reactions in solar-to-chemical conversions.
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