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HKUST-1-derived highly ordered Cu nanosheets with enriched edge sites, stepped (211) surfaces and (200) facets for effective electrochemical CO2 reduction.
Wang, Da; Xu, Jinli; Zhu, Ying; Wen, Lingsha; Ye, Jiexu; Shen, Yi; Zeng, Tao; Lu, Xiaohui; Ma, Jun; Wang, Lizhang; Song, Shuang.
Afiliação
  • Wang D; College of Environment, Zhejiang University of Technology, Hangzhou, 310032, China; School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou, 221116, China.
  • Xu J; College of Environment, Zhejiang University of Technology, Hangzhou, 310032, China.
  • Zhu Y; College of Environment, Zhejiang University of Technology, Hangzhou, 310032, China.
  • Wen L; College of Environment, Zhejiang University of Technology, Hangzhou, 310032, China.
  • Ye J; College of Environment, Zhejiang University of Technology, Hangzhou, 310032, China.
  • Shen Y; College of Environment, Zhejiang University of Technology, Hangzhou, 310032, China.
  • Zeng T; College of Environment, Zhejiang University of Technology, Hangzhou, 310032, China.
  • Lu X; State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, China.
  • Ma J; State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, China.
  • Wang L; School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou, 221116, China.
  • Song S; College of Environment, Zhejiang University of Technology, Hangzhou, 310032, China. Electronic address: ss@zjut.edu.cn.
Chemosphere ; 278: 130408, 2021 Sep.
Article em En | MEDLINE | ID: mdl-34126676
ABSTRACT
A novel electrode composed of Cu nanosheets constructed from nanoparticles was synthesized by in situ electrochemical derivation from the metal-organic framework (MOF) HKUST-1. The prepared derivative electrode (HE-Cu) exhibited higher Faradaic efficiency (FE, 56.0%) of electrochemical CO2 reduction (CO2R) compared with that of pristine Cu foil (p-Cu, 32.3%) at an overpotential of -1.03 V vs. a reversible hydrogen electrode (RHE). HE-Cu also exhibited lower onset potential of CO2R as well as inhibiting the H2 evolution reaction. Electrochemical measurements revealed that HE-Cu exhibited higher CO2 adsorption (1.58-fold) and a larger electrochemical active surface area (1.24-fold) compared with p-Cu. Physicochemical characterization and Tafel analysis showed that stepped Cu (211) surfaces, (200) facets and Cu edge atoms on HE-Cu contributed significantly to the enhanced CO2R activity and/or HCOOH and/or C2 product selectivity. The FEs of HCOOH and C2 products for HE-Cu increased 1.57-fold and 10.6-fold at an overpotential of -1.19 V vs. RHE compared with p-Cu. Although CH4 was produced on p-Cu, its formation was totally suppressed on HE-Cu due to the increase of edge sites and (200) facets. Our study demonstrates that electroreduction of MOFs is a promising method to prepare novel and stable electrochemical catalysts with unique surface structures. The fabricated derivative electrode not only promoted electrochemical CO2R activity but also exhibited high C2 product selectivity.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Estruturas Metalorgânicas Idioma: En Revista: Chemosphere Ano de publicação: 2021 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Estruturas Metalorgânicas Idioma: En Revista: Chemosphere Ano de publicação: 2021 Tipo de documento: Article