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Cation vacancy-enriched Ce1-xO2/Pd with enhanced H* utilization for efficient electrocatalytic hydrodechlorination
Yujia Tang, Xiaokun Fan, Kaixuan Zhang, Yuanyuan Sun, Hao Tan, Yukun Zhu*, Lijie Zhang*
https://doi.org/10.1016/j.cjsc.2026.101012
Electrocatalytic hydrodechlorination; Chlorinated organic compounds; Pd catalysts; Cationic vacancy; H* utilization efficiency
ABSTRACT
Palladium (Pd) is an optimal electrocatalyst for electrocatalytic hydrodechlorination (EHDC), but its activity is severely restricted by the insufficient H* generation and low utilization efficiency. Herein, nano-Pd supported on cation-vacancy-rich Ce1-xO2 (Pd/Ce1-xO2) was synthesized. The excellent water activation property of CeO2 accelerates proton supply and promotes H* generation. Meanwhile, abundant cation vacancies facilitate the H* adsorption and stabilization, reserving more active H* for EHDC. Furthermore, the strong metal-support interaction (SMSI) between Ce1-xO2 and Pd induces electron-rich Pd sites, boosting the adsorption of both H* and pollutant. Using 4-Chlorophenol (4-CP) as the target pollutant, it achieves 100% 4-CP removal across a concentration range of 20-200 mg L−1. At a 4-CP concentration of 100 mg L−1, its dechlorination activity (DA) reaches 6.2 mmol 4-CP gPd−1 min−1, which is 2.7 times that of Pd/CeO2 (2.3 mmol4-CP gPd−1 min−1), and 8.9 times that of pure Pd (0.7 mmol4-CP gPd−1 min−1). Additionally, it displays efficient degradation performance toward various pollutants, coupled with excellent stability and anti-interference ability. This work offers a feasible strategy for the rational design of high-efficiency Pd-based EHDC electrocatalysts.
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