Electrocatalytic hydrodechlorination on Pd composite electrode: Oxygen defect engineering of cobalt oxide as functional interlayer

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL Journal of Electroanalytical Chemistry Pub Date : 2025-03-15 DOI:10.1016/j.jelechem.2025.119078

Xinghui Du , Shuang Wu , Chenghui Luo , Shengkun Zhang , Ququ Jing , Lei Hao , Shitao Peng , Xinhua Xu

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Abstract

Palladium (Pd) modified nickel foam (NiF) serves as an effective composite electrode for electrocatalytic hydrodechlorination (ECH), but reducing the Pd dose while sustaining its activity remains challenging. This study proposes a Pd/CoO_x/NiF electrode, with an oxygen vacancy-enriched CoO_x interlayer introduced to disperse Pd and expose active sites. Compared to Pd/NiF, only 20 % of Pd is required to completely dechlorinate 2-chlorophenol (2-CP) within 2 h. By manipulating oxygen vacancies (OVs) with varied NaBH₄ reduction time, the Pd/CoO_x/NiF electrode shows 1.4-fold higher dechlorination efficiency of 2-CP at moderate OVs concentrations but suffers from a decline in activity at higher OVs concentrations. The electrode displays uniform nanosheet distribution, compact arrangement, and stability, maintaining 100 % 2-CP removal efficiency after five cycles. Quench studies showed that the H^⁎-mediated indirect reduction pathway contributed to 87.4 % of 2-CP removal, serving as the main dechlorination route for the Pd/CoO_x/NiF electrode. This study demonstrates that the Pd/CoO_x/NiF electrode with optimal oxygen vacancies achieves excellent ECH performance while significantly reducing Pd usage.

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来源期刊

Journal of Electroanalytical Chemistry 化学-电化学

CiteScore

7.80

自引率

6.70%

发文量

912

审稿时长

2.4 months

期刊介绍： The Journal of Electroanalytical Chemistry is the foremost international journal devoted to the interdisciplinary subject of electrochemistry in all its aspects, theoretical as well as applied. Electrochemistry is a wide ranging area that is in a state of continuous evolution. Rather than compiling a long list of topics covered by the Journal, the editors would like to draw particular attention to the key issues of novelty, topicality and quality. Papers should present new and interesting electrochemical science in a way that is accessible to the reader. The presentation and discussion should be at a level that is consistent with the international status of the Journal. Reports describing the application of well-established techniques to problems that are essentially technical will not be accepted. Similarly, papers that report observations but fail to provide adequate interpretation will be rejected by the Editors. Papers dealing with technical electrochemistry should be submitted to other specialist journals unless the authors can show that their work provides substantially new insights into electrochemical processes.