Journal
NANO ENERGY
Volume 104, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2022.107957
Keywords
CO2 electroreduction reaction; Pd; C electrocatalyst; O-Pd-Cl interface; KCl electrolyte; CO tolerance; Stability
Categories
Funding
- National Natural Science Foundation of China (NSFC) [22078052]
- Fundamental Research Funds for the Central Universities [DUT22ZD207]
- Innovation Program of Dalian City [2019RJ03]
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By manipulating catalyst-electrolyte interfaces in saturated KCl electrolyte, the CO tolerance and activity of Pd/C catalyst can be enhanced. The reconstructed Pd/C catalysts exhibit high activity and stability in the presence of high concentrations of CO. These findings are important for the design and fabrication of active and stable Pd-based catalysts, as well as the manipulation of activity and stability at catalyst-electrolyte interfaces.
Carbon-supported Pd catalysts are highly active yet can be easily poisoned by the in-situ formed carbon monoxide (CO) during CO2 electrochemical reduction reaction (CO2RR). Herein, we introduce a novel approach to enhance the CO tolerance and activity of Pd/C catalyst by manipulating catalyst-electrolyte interfaces in saturated KCl electrolyte. During the CO2RR, the Cl- ions in electrolyte trigger the surface dynamic reconstruction of Pd/C catalyst with the formation of O-Pd-Cl species at catalyst-electrolyte interfaces. The reconstructed Pd/C catalysts can achieve nearly 100% of CO Faradaic efficiency and feature high stability and CO tolerance, which can maintain a better activity in the presence of over 2000 ppm and 23200 ppm of CO in H-type cell and flow cell, respectively. Meanwhile, using such highly concentrated electrolyte, the hydrogen evolution reaction is strongly suppressed. The experimental and theoretical results have confirmed that the O-Pd-Cl species mediated by Cl- ions enable the high activity, good CO resistance and long lifetime of the Pd/C catalyst. These findings may provide some inspirations into the design and fabrication of active yet stable Pd-based catalysts for CO2 electroreduction, and offer some insights into manipulation of the activity and stability for the Pd catalysts at catalyst-electrolyte interfaces.
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