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Journal article
Free Standing Nanoporous Palladium Alloys as CO Poisoning Tolerant Electrocatalysts for the Electrochemical Reduction of CO2 to Formate
ACS catalysis, v 9(6), pp 5290-5301
07 Jun 2019
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
CO2 electrochemical reduction to formate has emerged as one of the promising routes for CO2 conversion to useful chemicals and energy storage. Palladium has been shown to make formate with a high selectivity at minimal overpotential. However, production of CO as a minor product quickly deactivates the catalyst during extended electrolysis. Here, we present nanoporous Pd alloys (np-PdX) formed by electrochemical dealloying of Pd15X85 alloys (X = Co, Ni, Cu, and Ag) as active free-standing electrocatalysts with high formate selectivity and CO poisoning tolerance. Rate of deactivation under constant potential electrolysis, due to CO passivation, is strongly correlated to the identity of the transition metal alloying component. We purport that this composition dependent behavior is due to the induced electronic changes in the active Pd surface, affecting both the CO adsorption strength and the near surface hydrogen solubility, which can impact the adsorption strength of active/inactive intermediates and reaction selectivity. Free-standing np-PdCo and np-PdNi are found to exhibit high areal formate partial current densities, >20 mA cm–2, with high CO poisoning tolerance and minimal active area loss at cathodic potentials, demonstrating the utility of these materials for selective and stable CO2 electrolysis.
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Details
- Title
- Free Standing Nanoporous Palladium Alloys as CO Poisoning Tolerant Electrocatalysts for the Electrochemical Reduction of CO2 to Formate
- Creators
- Swarnendu Chatterjee - Drexel UniversityCharles Griego - University of PittsburghJames L Hart - Drexel UniversityYawei Li - Drexel UniversityMitra L Taheri - Drexel UniversityJohn Keith - University of PittsburghJoshua D Snyder - Drexel University
- Publication Details
- ACS catalysis, v 9(6), pp 5290-5301
- Publisher
- American Chemical Society; Washington, DC
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Chemical and Biological Engineering
- Web of Science ID
- WOS:000471212600056
- Scopus ID
- 2-s2.0-85066129639
- Other Identifier
- 991019169112704721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Chemistry, Physical