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Interatomic electron transfer promotes electroreduction CO_(2)-to-CO efficiency over a CuZn diatomic site

Nano Research 2023年第7期16卷 8863-8870页

作者： Jican hao Han Zhu Qi Zhao jiace hao Shuanglong Lu Xiaofan Wang Fang Duan Mingliang Du Key Laboratory of Synthetic and Biological Colloids Ministry of EducationSchool of Chemical and Material EngineeringJiangnan UniversityWuxi 214122China School of Biological and Chemical Sciences Queen Mary University of LondonLondon E14NSUK

Diatomic site catalysts(DACs)with two adjacent atomic metal species can provide synergistic interactions and more sophisticated functionalities to break the bottleneck of intrinsic drawbacks of single atom catalysts(SACs).Herein,we have designed a CuZn diatomic site(CuZn-DAS)electrocatalyst with unique coordination structure(CuN_(4)-ZnN_(4))by anchoring and ordering the spatial distance between the metal precursors on the carbon nitride(C_(3)N_(4))derived N-doped carbon(NC)*** CuZn-DAS/NC shows high activity and selectivity for electroreduction CO_(2)into *** Faradaic efficiency for CO of CuZn-DAS/NC(98.4%)is higher than that of Cu single atomic site on NC(Cu-SAS/NC)(36.4%)and Zn single atomic site on NC(Zn-SAS/NC)(66.8%)at-0.6 V versus reversible hydrogen electrode(***).In situ characterizations reveal that the CuZn-DAS is more favorable for the formation and adsorption of^(*)COOH than those of the electrocatalysts with single atomic *** calculations show that the charge redistribution of Zn site in CuZn-DAS/NC caused by the considerable electron transfers from Zn atoms to the adjacent Cu atoms can reduce the adsorption energy barriers for^(*)COOH and^(*)CO production,improving the activity and CO selectivity.

关键词： CuZn diatomic site CO_(2)electroreduction reaction interatomic electron transfer in situ characterizations

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In Situ Fabrication of Electrospun Carbon Nanofibers-Binary Metal Sulfides as Freestanding Electrode for Electrocatalytic Water Splitting

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Advanced Fiber Materials 2021年第2期3卷 117-127页

作者： Zhenfeng Zhu jiace hao Han Zhu Shuhui Sun Fang Duan Shuanglong Lu Mingliang Du Key Laboratory of Synthetic and Biological Colloids Ministry of EducationSchool of Chemical and Material EngineeringJiangnan UniversityWuxi 214122People’s Republic of China

In search of effective and stable bifunctional electrocatalyst for electrocatalytic water splitting is still a major challenge for the highly efficient H_(2) ***,we reported a facile strategy to design high-indexed Cu_(3)Pd_(13)_S_(7) nanoparticles(NPs)in situ synthesized on the three-dimensional(3D)carbon nanofibers(CNFs)by combining electrospinning and chemical vapor deposition(CVD)*** high-index facets with abundant active sites,the 3D architecture CNFs with high specific surface area and synergistic effect of Cu-Pd-S bonds with strong electron couplings together promote the elec-trocatalytic *** Cu_(3)Pd_(13)_S_(7)/CNFs shows excellent electrocatalytic activity with low overpotentials of 52 mV(10 mA cm^(−2))for hydrogen evolution reaction(HER)and 240 mV(10 mA cm^(−2))for oxygen evolution reaction(OER).The excellent protection of Cu_(3)Pd_(13)_S_(7) by CNFs from aggregation and electrolyte corrosion lead to the high stability of Cu_(3)Pd_(13)_S_(7)/CNFs under acidic and alkaline conditions.

关键词： Electrospinning Carbon nanofibers Binary metal sulfides Water splitting Materials science

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