TiO2@PDA inorganic-organic core-shell skeleton supported Pd nanodots for enhanced electrocatalytic hydrodechlorination

Zhefei Zhao; Li Yu; Lingxia Zheng; Tianyang Guo; Zhuoqing Lv; Shuang Song; Huajun Zheng

doi:10.1016/j.jhazmat.2022.128998

TiO₂@PDA inorganic-organic core-shell skeleton supported Pd nanodots for enhanced electrocatalytic hydrodechlorination

J Hazard Mater. 2022 Aug 5:435:128998. doi: 10.1016/j.jhazmat.2022.128998. Epub 2022 Apr 22.

Authors

Zhefei Zhao¹, Li Yu¹, Lingxia Zheng², Tianyang Guo¹, Zhuoqing Lv¹, Shuang Song³, Huajun Zheng⁴

Affiliations

¹ Department of Applied Chemistry, Zhejiang University of Technology, Hangzhou 310032, PR China.
² Department of Applied Chemistry, Zhejiang University of Technology, Hangzhou 310032, PR China; State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology, Zhejiang University of Technology, Hangzhou 310032, PR China.
³ College of Environment, Zhejiang University of Technology, Hangzhou 310032, PR China.
⁴ Department of Applied Chemistry, Zhejiang University of Technology, Hangzhou 310032, PR China; State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology, Zhejiang University of Technology, Hangzhou 310032, PR China. Electronic address: zhenghj@zjut.edu.cn.

PMID: 35487007
DOI: 10.1016/j.jhazmat.2022.128998

Abstract

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.

Keywords: 4-chlorophenol; Electrocatalytic hydrodechlorination; Inorganic-organic core-shell skeleton; Palladium nanodots.