Facet-Dependent Electrocatalytic Reduction of CO₂ to HCOOH over Pd Nanoparticles

Abstract:

Pd is one of the most promising catalysts for carbon dioxide electroreduction (CO₂RR) to formate (HCOO-). However, the lack of understanding of the active phase remains remains obscure with the role of different crystal facets in the formation of formic acid. Herein, Pd nanocubes and nanooctahedra particles with Pd (100) and (111) facets were, respectively, prepared. Compared with ordinary Pd nanoparticles and Pd octahedra, Pd nanocubes exhibited the most excellent electrocatalytic performance of carbon dioxide reduction, achieving a Faraday efficiency of 96% for formate production at a low applied potential of-0.20 V (vs RHE) in 0.5 M KHCO₃. At the same time, first-principles theoretical calculations also showed that the Pd (100) surface is more conducive to the conversion of CO₂ to HCOO* intermediates, thereby promoting the formation of formic acid. This result indicates that the Pd (100) crystal plane is more conducive to the reduction of CO₂ to formate. This research has important guiding significance for exploring the efficient reduction of carbon dioxide to formic acid catalyst.

• Periodical: Key Engineering Materials (Volume 915)
• Pages: 115-120
• DOI: https://doi.org/10.4028/p-y1z4lz
• Online since: March 2022
• Authors: Hou Dong Rao*, Chong Lin, Wen Fei Wang, Bing Wang, Wei Cheng, Xin Zhi Lin
• Keywords: Carbon Dioxide Reduction, Electrocatalysis, Facet, Formic Acid, Palladium

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