Electrodeposition Decoration of Pd⁰ on F‐Co(OH)₂ Nanoarrays with Intentionally Introduced Pd²⁺ Species for Efficient Electrocatalytic Hydrodechlorination of 2,4‐Dichlorophenol

Abstract Developing a Pd‐based catalyst possessing high efficiency and low mass loading remains a big obstacle for the large‐scale application of electrocatalytic hydrodechlorination (EHDC) of chlorophenols (CPs). Herein, high dispersion Pd nanoparticles imbedded in Pd 2+ hydroxide species are decorated on the surface of F−Co(OH) 2 nanowire arrays with a newly developed electrodeposition and hydrolysis coupled process. EHDC of 2,4‐dichlorophenol (2,4‐DCP) with the as‐obtained Pd/F−Co(OH) 2 /NF‐a exhibits superior performance than other control samples in this work and literature reports. A 100 % removal of 2,4‐DCP is accomplished within 120 min, featuring fast reaction kinetics (kobs=5.0×10 −2 min −1 ) and mass activity (MA=22.2 min −1 g −1 Pd). Mechanism investigation shows that the intentionally introduced Pd 2+ sites play a pivotal role in the adsorption of 2,4‐DCP, while high dispersion of Pd facilitates the generation of active H*, thus promoting the catalytic performance. This work presents a valuable example for designing high‐performance Pd‐based EHDC catalysts by composition tuning.