A binder‐free composite of graphite and kaolinite as a stable working electrode for general electrochemical applications

Electrochemical Science Advances

Gamini Rajapakse¹  Amarasooriya Pitawala²  Kohobhange S. P. Karunadasa³  Chinthan Manoratne³  Dananjali Rathnayake⁴ 

[1] Department of Chemistry Faculty of Science University of Peradeniya Peradeniya Sri Lanka;Department of Geology Faculty of Science University of Peradeniya Peradeniya Sri Lanka;Materials Technology Section Industrial Technology Institute Colombo 07, 00700 Sri Lanka;Postgraduate Institute of Science (PGIS) University of Peradeniya Peradeniya 20400 Sri Lanka;

关键词: Clay;    Composite electrode;    Conducting materials;    Electrochemistry;    Graphite;   

DOI  :  10.1002/elsa.202100003

来源: DOAJ

【 摘 要 】

Abstract Composite electrodes are essential to overcome dynamic challenges related to electrodes made of polymeric binders. Herein, this work reports a composite electrode consisting of graphite and kaolinite (GKCE) as a potential alternative for commercial electrodes. The GKCE series exhibits exponential decay in resistivity parallel to the linear increase in mechanical strength depending on the relative strength of the unique lamella‐like graphite structure when going from low to high graphite percentage. GKCE with 80% graphite employed as the model working electrode for analyte detection and electropolymerization. GKCE can produce a typical voltammogram response with a narrow potential range and highest sensitivity (1.2 A m/mol) towards the analyte (Fe2+/Fe3+) compared to commercial working electrodes. Electropolymerization with GKCE leads to a polyaniline network consisting of nanofibers with the lowest charge transfer resistance of 403 Ω. GKCE is a potential low‐cost electrode for general electrochemical applications in comparison with expensive commercial working electrodes.

【 授权许可】

Unknown