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Graphite felt modified with electroless Co–Ni–P alloy as an electrode material for electrochemical oxidation and reduction of polysulfide species

Brigita Macijauskienė and Egidijus Griškonis

Department of Physical and Inorganic Chemistry, Kaunas University of Technology, Radvilenu pl. 19, LT-50254, Kaunas, Lithuania



Abstract: Electroless deposition of a Co–Ni–P alloy on the surface of graphite felt filaments was performed in a low-temperature pyrophosphate solution under flow-through conditions. The loading, composition, morphology, and structure of electroless the Co–Ni–P alloy deposit on the filaments of the modified graphite felt were investigated by gravimetric analysis, energy-dispersive X-ray spectroscopy, scanning electron microscopy and X-ray diffraction, respectively. Electrochemical characterization of a graphite felt electrode modified with electroless Co–Ni–P alloy was performed by cyclic voltammetry, chrono-techniques, and the electrochemical impedance spectroscopy test in an aqueous solution of polysulfide composed of the mixture of 1 M Na2S, 1 M NaOH and 1 M S. It was found that the electroless Co–Ni–P alloy deposit on graphite felt has good cycling stability and high electrocatalytic activity toward reversible electrochemical redox reactions of polysulfide species. In comparison with the bare graphite felt electrode, the electrode modified with the electroless Co–Ni–P alloy showed five to seven times lower values of anodic and cathodic overpotentials in the aqueous solution of polysulfide. It is very likely that the good electrochemical performance of the modified graphite felt electrode is related to the high surface area of the electroless Co–Ni–P alloy deposit.

Keywords: graphite felt; electroless Co–Ni–P alloy; flow-through conditions; electrocatalyst; polysulfide

Full paper is available at

DOI: 10.1515/chempap-2016-0094


Chemical Papers 70 (12) 1611–1620 (2016)

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