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Title: Precisely doping the surface of tin-based electrocatalysts for improved CO2 conversion to liquid chemicals

Journal Article · · Applied Catalysis. B, Environmental
ORCiD logo [1];  [1];  [2];  [1];  [2];  [1]
  1. National Energy Technology Lab. (NETL), Pittsburgh, PA (United States)
  2. National Energy Technology Lab. (NETL), Pittsburgh, PA (United States); Univ. of Pittsburgh, PA (United States)

Doping tin catalysts with sulfur can improve the electrochemical CO2 conversion into formate/formic acid, but the lack of composition-dependent activity trends hinders further catalyst development. Here, we precisely controlled the composition of sulfur-doped Sn catalysts to show that sulfur doping only improves CO2 conversion over a very narrow composition range, achieving maximum activity at 1.4 at% S. In situ Raman spectroscopy indicted working catalysts were in a primarily metallic state (e.g. S-Sn), and we achieved some of the highest reported partial current densities in both H-cell and full-cell electrolyzer configurations. Density Functional Theory calculations predicted S atoms preferentially occupied the catalyst surface and improved CO2 reduction by localizing charge density at the catalyst/intermediate interface, which stabilized the *OCOH intermediate and lowered the CO2 conversion thermodynamic barrier. Our work quantifies the composition-dependent influence of S dopants on Sn-based CO2 reduction catalysts and provides a pathway for maximizing their CO2 conversion activity.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)
Sponsoring Organization:
USDOE Office of Fossil Energy and Carbon Management (FECM)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1997990
Journal Information:
Applied Catalysis. B, Environmental, Journal Name: Applied Catalysis. B, Environmental Journal Issue: 2024 Vol. 340; ISSN 0926-3373
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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