journal article·2021-03-10

Heterostructure of ZnO Nanosheets/Zn with a Highly Enhanced Edge Surface for Efficient CO2 Electrochemical Reduction to CO

Qian Xiang, Fan Li, Jiale Wang, Wenlong Chen, Qiushi Miao, Qingfeng Zhang, Peng Tao, Chengyi Song, Wen Shang, Hong Zhu, Tao Deng, Jianbo Wu

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Abstract

Electrochemical reduction of CO2 to valuable chemicals or fuels is critical for closing the carbon cycle and preventing further deterioration of the environment. Here, we discover that by adopting the Zn foil as the substrate, a ZnO two-dimensional sheet array is in situ synthesized on the Zn foil by a facile hydrothermal method. The obtained ZnO sheet array/Zn foil exhibited an outstanding CO2 reduction performance to CO, which showed the highest Faraday efficiency of 85% for CO at −2.0 V (vs Ag/AgCl) with a current density of 11.5 mA/cm2 compared with the freestanding ZnO sheets and particles and excellent stability in the 0.1 M KHCO3 electrolyte. The in situ vertical ZnO sheet array exposed with abundant exposed (11̅00) edge facets can accelerate the electron transfer and improve the number of active sites, which leads to the enhanced reduction performance. Alongside, the density functional theory simulation indicated that the vertical-grown ZnO sheet array possesses lower Gibbs free energy for the CO2 activation, with a more exposed (11̅00) edge surface of ZnO.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: CO2 Reduction Techniques and Catalysts · Advanced Thermoelectric Materials and Devices · Advanced battery technologies research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, P. R. China

University of Michigan—Shanghai Jiao Tong University Joint Institute, Shanghai 200240, P. R. China

Materials Genome Initiative Center, Shanghai Jiao Tong University, Shanghai 200240, P. R. China

Center of Hydrogen Science, Shanghai Jiao Tong University, Shanghai 200240, P. R. China

Funding

Shanghai Jiao Tong University · State Administration of Foreign Experts Affairs · Ministry of Education of the People's Republic of China · Ministry of Science and Technology of the People's Republic of China · Shanghai Municipal Education Commission · Science and Technology Commission of Shanghai Municipality · National Natural Science Foundation of China

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