Enhanced electrocatalytic performance of CoCu-MOF/polyaniline for glycerol oxidation

• Published in: Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 2020-01, Vol.857, p.113748, Article 113748
• Main Authors: Zhu, Shichao, Xie, Aijuan, Tao, Xiang, Zhang, Jianghui, Wei, Bingyan, Liu, Zhongxiang, Tao, Yuwei, Luo, Shiping
• Format: Article
• Language: English
• Subjects: Catalytic oxidation; CoCu metal-organic framework; Glycerol; Hybrid; Polyaniline
• ISSN: 1572-6657; 1873-2569
• DOI: 10.1016/j.jelechem.2019.113748

The novel CoCu metal-organic framework (CoCu-MOF) precursor and CoCu-MOF/polyaniline (CoCu-MOF/PANI) electrode materials were synthesized by hydrothermal method and in situ polymerization, respectively. The as-synthesized CoCu-MOF/PANI and corresponding composite were first tested for their electrocatalytic performance towards glycerol oxidation in KOH solution and then the selection and optimization were further carried out for the CoCu-MOF/PANI composite. The preferred material was subjected to a group of electrochemical performance tests such as cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), Tafel, and chronoamperometry. The results show that among the various electrode materials, the as-synthesized CoCu-MOF1/PANI1 hybrid exhibits enhanced electrocatalytic activity at the scanning speed of 100 mV s−1. EIS test manifests that the CoCu-MOF1/PANI1 has the lower impedance. Tafel test reveals that CoCu-MOF1/PANI1 is beneficial to increase the oxidation rate of glycerol. Chronoamperometry and CO stripping declare CoCu-MOF1/PANI1 has better stability and CO anti-poisoning relative to commercial Pt/C (20 wt%)-SA. The enhancement of electrochemical properties, stability and CO resistance is ascribed to the synergetic effect of CoCu-MOF and PANI substrate on the oxidation of glycerol. Scheme 1 Schematic illustration of the fabrication process of CoCu-MOF/PANI. CoCu-MOF was first synthesized via hydrothermal method, and then CoCu-MOF/PANI hybrid was prepared by in-situ polymerization process. The fabricated CoCu-MOF/PANI hybrid exhibited excellent electrochemical performance, especially in terms of glycerol oxidation. [Display omitted] •CoCu-MOF/PANI was synthesized by hydrothermal method and in situ polymerization.•CoCu-MOF/PANI (1:1) exhibited the higher activity towards glycerol oxidation.•CoCu-MOF/PANI (1:1) hybrid possessed higher stability, better poison resistance.•The enhanced performance is ascribed to the synergetic effect of CoCu-MOF and PANI substrate.