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Robust palladium hydride catalyst for electrocatalytic formate formation with high CO tolerance

Journal Article · · Applied Catalysis. B, Environmental
 [1];  [1];  [1];  [1];  [1];  [2];  [1];  [1]
  1. Univ. of California, Irvine, CA (United States)
  2. Univ. of New Mexico, Albuquerque, NM (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Palladium is unique in the electrocatalytic reduction of CO2 to formate because of its low or even near-equilibrium onset potential. However, the inevitably produced CO molecules poison and deactivate the catalyst surface, resulting in an insufficient operating lifetime (<30 min) for conventional and optimized Pd catalysts. In this work, we present a hydrogen-rich Palladium hydride catalyst (PdH0.5/C) derived from a one-step solvothermal synthesis. This catalyst showed a 93.1 % faradaic efficiency towards formate at – 0.4 V (vs RHE). The working lifetime reached a record of 4 h, which was ~15 times longer than a commercial Pd catalyst and outperformed all previous Pd-based electrocatalysts for CO2-HCOO conversion. The high CO tolerance was attributed to the selectivity improvement induced by lattice hydrogen and the weak CO adsorption strength on diverse active sites (i.e. kink, step, and terrace). Isotopic analysis revealed a direct participation of the lattice hydrogen in the protonation of CO2 molecules in formate formation.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Bioenergy Technologies Office (BETO)
Grant/Contract Number:
89233218CNA000001; EE0008923
OSTI ID:
1998117
Report Number(s):
LA-UR--22-24339
Journal Information:
Applied Catalysis. B, Environmental, Journal Name: Applied Catalysis. B, Environmental Vol. 316; ISSN 0926-3373
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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