Unveiling the efficient state of Pd catalyst for robust electrocatalytic hydrodechlorination

Shuyuan Xu; Bingbao Mei; Fengjiao Li; Jianing Mao; Changxing Huang; Yufeng Yan; Ningning Chen; Yinghua Xu; Meiqin Shi

doi:10.1088/1361-6528/aceb6b

Unveiling the efficient state of Pd catalyst for robust electrocatalytic hydrodechlorination

Nanotechnology. 2023 Aug 16;34(44). doi: 10.1088/1361-6528/aceb6b.

Authors

Shuyuan Xu^{1

2}, Bingbao Mei³, Fengjiao Li^{1

2}, Jianing Mao^{4

5}, Changxing Huang^{1

2}, Yufeng Yan^{1

2}, Ningning Chen⁶, Yinghua Xu^{1

2}, Meiqin Shi^{1

2}

Affiliations

¹ College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310032, Zhejiang, People's Republic of China.
² Petroleum and Chemical Industry Key Laboratory of Organic Electrochemical Synthesis, Zhejiang 310032, People's Republic of China.
³ Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, People's Republic of China.
⁴ Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, People's Republic of China.
⁵ University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.
⁶ Shandong Binzhou Ecological Environmental Monitoring Center, Shandong, 256600, People's Republic of China.

PMID: 37506682
DOI: 10.1088/1361-6528/aceb6b

Abstract

The application of electrochemical hydrodechlorination has been impeded due to the low utilization and activity of Pd catalyst. Herein, a series of Pd catalysts were prepared via the controllable evolution of Zn state during the pyrolysis of ZIF-8 nanosheet. Various forms of Pd with different chemical surroundings were generated upon the combined use of galvanic displacement and ion exchange process. Electrocatalytic hydrodechlorination of 4-chlorophenol was performed and the electrocatalytic hydrodechlorination efficiency of Pd/CN reaches 100% within 3 h at extra low Pd concentration. The coexistence of zero-valent Pd (Pd⁰) and nitrogen coordinated Pd (Pd-N) was verified by XAFS which provide multiple active sites for focusing on adsorbing H* and cracking C-Cl respectively. The synergetic effect between different chemical state of Pd for efficient hydrodechlorination of chloroaromatics and scheme for dexterous preparation of Pd based electrocatalyst are proposed and discussed.

Keywords: Pd; electrocatalytic hydrodechlorination; galvanic displacement; ion exchange; synthesis.