期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 117, 期 3, 页码 1330-1338出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1911159117
关键词
binary copper-iron catalyst; CO2 reduction; methane; photoelectrocatalysis
资金
- University of Michigan College of Engineering Blue Sky Research Program
- Natural Science and Engineering Research Council of Canada (NSERC) [RGPIN-2017-05187, STPGP 494012-16]
- McGill Engineering Doctoral Award
- Supercomputer Consortium Laval Universite du Quebec a Montreal (UQAM) McGill and Eastern Quebec
- Emissions Reduction Alberta
A rational design of an electrocatalyst presents a promising avenue for solar fuels synthesis from carbon dioxide (CO2) fixation but is extremely challenging. Herein, we use density functional theory calculations to study an inexpensive binary copper-iron catalyst for photoelectrochemical CO2 reduction toward methane. The calculations of reaction energetics suggest that Cu and Fe in the binary system can work in synergy to significantly deform the linear configuration of CO2 and reduce the high energy barrier by stabilizing the reaction intermediates, thus spontaneously favoring CO2 activation and conversion for methane synthesis. Experimentally, the designed CuFe catalyst exhibits a high current density of -38.3 mA.cm(-2) using industry-ready silicon photoelectrodes with an impressive methane Faradaic efficiency of up to 51%, leading to a distinct turnover frequency of 2,176 h(-1) under air mass 1.5 global (AM 1.5G) one-sun illumination.
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