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- Title
Electroreduction of CO<sub>2</sub> on Single‐Site Copper‐Nitrogen‐Doped Carbon Material: Selective Formation of Ethanol and Reversible Restructuration of the Metal Sites.
- Authors
Karapinar, Dilan; Huan, Ngoc Tran; Ranjbar Sahraie, Nastaran; Li, Jingkun; Wakerley, David; Touati, Nadia; Zanna, Sandrine; Taverna, Dario; Galvão Tizei, Luiz Henrique; Zitolo, Andrea; Jaouen, Frédéric; Mougel, Victor; Fontecave, Marc
- Abstract
It is generally believed that CO2 electroreduction to multi‐carbon products such as ethanol or ethylene may be catalyzed with significant yield only on metallic copper surfaces, implying large ensembles of copper atoms. Here, we report on an inexpensive Cu‐N‐C material prepared via a simple pyrolytic route that exclusively feature single copper atoms with a CuN4 coordination environment, atomically dispersed in a nitrogen‐doped conductive carbon matrix. This material achieves aqueous CO2 electroreduction to ethanol at a Faradaic yield of 55 % under optimized conditions (electrolyte: 0.1 m CsHCO3, potential: −1.2 V vs. RHE and gas‐phase recycling set up), as well as CO electroreduction to C2‐products (ethanol and ethylene) with a Faradaic yield of 80 %. During electrolysis the isolated sites transiently convert into metallic copper nanoparticles, as shown by operando XAS analysis, which are likely to be the catalytically active species. Remarkably, this process is reversible and the initial material is recovered intact after electrolysis.
- Subjects
ELECTROLYTIC reduction; COPPER surfaces; METALS; PYROLYTIC graphite; METALLIC surfaces; ETHANOL; VINYL acetate
- Publication
Angewandte Chemie, 2019, Vol 131, Issue 42, p15242
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.201907994