Shape-Controlled CO2 Electrochemical Reduction on Nanosized Pd Hydride Cubes and Octahedra
- Univ. of Delaware, Newark, DE (United States); University of Delaware
- Columbia Univ., New York, NY (United States)
- Univ. of Delaware, Newark, DE (United States)
Electrochemical CO2 reduction reaction (CO2RR) provides a potential pathway to mitigate challenges related to CO2 emissions. Pd nanoparticles have shown interesting properties as CO2RR electrocatalysts, while how different facets of Pd affect its performance in CO2 reduction to synthesis gas with controlled H2 to CO ratios has not been studied. Herein, we synthesized nano-sized Pd cubes and octahedra particles dominated by Pd(100) and Pd(111) facets, respectively. Here, the Pd octahedra particles show higher CO selectivity (up to 95%) and better activity than Pd cubes and commercial particles. For both Pd octahedra and cubes, the ratio of H2/CO products was tunable between 1 and 2, a desirable ratio for methanol production and the Fischer-Tropsch processes. Further studies of Pd octahedra in a 25-cm2 flow cell showed a total CO current of 5.47 A was achieved at a potential of 3.4 V, corresponding to a CO partial current density of 220 mA/cm-2. In situ X-ray absorption spectroscopy studies showed that regardless of facet Pd transformed into Pd hydride (PdH) under reaction conditions. DFT calculations show that the reduced binding energies of CO and HOCO intermediates on PdH(111) are key parameters to the high current density and Faradaic efficiency in CO2 to CO conversion.
- Research Organization:
- Univ. of Delaware, Newark, DE (United States); Columbia Univ., New York, NY (United States)
- Sponsoring Organization:
- USDOE Office of Fossil Energy (FE); USDOE Office of Science (SC)
- Grant/Contract Number:
- FE0029868; AC02-06CH11357; SC0009476; SC0009476
- OSTI ID:
- 1712669
- Alternate ID(s):
- OSTI ID: 1614350
OSTI ID: 1490120
- Journal Information:
- Advanced Energy Materials, Journal Name: Advanced Energy Materials Journal Issue: 9 Vol. 9; ISSN 1614-6832
- Publisher:
- WileyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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