The development of catalysts with high atom utilization and activity is the biggest challenge for electrocatalytic hydrodechlorination (EHDC) technology. Herein, a design strategy of TiO₂@PDA inorganic-organic core-shell skeleton for loading lower dosage of noble palladium (Pd) with robust activity is reported. The self-supported TiO₂@PDA nanorod arrays provides exposed surface area for anchoring Pd and PDA as interlayer controls the Pd nucleation to form nanodots with high dispersion, realizing high atom utilization. Moreover, the strong interaction between PDA and Pd realizes the coexistence of electron-rich and deficient Pd species with suitable proportion, which facilitate the H* formation and the C-Cl bond activation, respectively, resulting in the promoted activity. The optimal TiO₂@PDA/Pd electrode exhibits a low dosage of Pd (0.093 mg cm⁻²) and excellent activity for 4-chlorophenol reduction with a mass activity (MA) of 23.96 min⁻¹g⁻¹, which is 3.31 times as high as that of TiO₂/Pd. The design scheme with inorganic-organic core-shell skeleton as support is benefit for developing highly efficient and lower price elctrocatalysts for EHDC.

开发具有高原子利用率和活性的催化剂是电催化加氢脱氯（EHDC）技术面临的最大挑战。本文报道了一种 TiO ₂ @PDA 无机-有机核壳骨架的设计策略，用于负载较低剂量的具有稳健活性的贵金属钯 (Pd)。自支撑TiO ₂@PDA 纳米棒阵列提供了用于锚定 Pd 和 PDA 的暴露表面积，因为夹层控制 Pd 成核以形成具有高分散性的纳米点，实现高原子利用率。此外，PDA与Pd之间的强相互作用实现了富电子和缺电子Pd物种以适当的比例共存，分别促进了H*的形成和C-Cl键的活化，从而促进了活性。最佳的 TiO ₂ @PDA/Pd 电极表现出低 Pd 用量（0.093 mg cm ^-2）和优异的 4-氯苯酚还原活性，质量活度（MA）为 23.96 min ^-1 g ^-1，是 3.31 倍与 TiO ₂一样高/钯。以无机-有机核壳骨架为支撑的设计方案有利于开发高效、低价的EHDC电催化剂。