Abstract
Ceramic substrates were metallized with a Ni-Mo-P electroless coating and further modified with a polypyrrole (PPy) coating by the electrodeposition method. The properties of the polypyrrole coating were studied with the addition of a graphene oxide (GO) nanomaterial prior to the electrodeposition and its reduction degree. Fourier Transform Infrared Spectroscopy, Field-Emission Scanning Electron Microscopy, Raman spectroscopy and cyclic voltammetry were employed to characterize the properties of the coatings. The results indicated the successful synthesis of conductive electrodes by the proposed approach. The electrodeposition of PPy and its charge storage properties are improved by chemically reduced GO. The surface capacitive contribution to the total stored charge was found to be dominant and increased 2–3 fold with the reduction of GO. The chemically reduced GO-modified PPy exhibits the highest capacitance of 660 F g−1 at 2 mV s−1, and shows a good cyclability of 94% after 500 charge/discharge cycles. The enclosed results indicate the use of an NiMoP electroless coating, and modification with a carbon nanomaterial and conducting polymer is a viable approach for achieving functional ceramics.
Highlights
From the point of view of low-cost production, environmentally friendliness, and performance, renewable energy production and energy storage are among the most popular and interesting worldwide areas
The materials with a high surface area and electrical conductivity are highly employed in energy storage devices, as it is known that electrical double-layer capacitors (EDLCs)-based electrodes mainly involve charge stored via electrostatic force at the electrode/electrolyte interface [13]
The ceramic substrates were metallized by the electroless deposition (ED) process according to the method developed by Rosas-Laverde et al [1]
Summary
From the point of view of low-cost production, environmentally friendliness, and performance, renewable energy production and energy storage are among the most popular and interesting worldwide areas. The materials with a high surface area and electrical conductivity are highly employed in energy storage devices, as it is known that electrical double-layer capacitors (EDLCs)-based electrodes mainly involve charge stored via electrostatic force at the electrode/electrolyte interface [13]. These materials include carbon nanomaterials, such as carbon nanotubes, graphene and its oxide derivatives, carbon fibers, etc. The properties of the obtained electrodes for energy storage are evaluated by CV, as this method provides with a simple yet effective technique by which to electrochemically evaluate the reaction kinetics of active materials in order to deconvolute the contribution of surface and bulk electrochemical processes to the total stored charge. The obtained results indicate the successful fabrication of a simple, fast, and low-cost ceramic supercapacitor electrode which exhibits a good performance (about 660 F g−1 at 2 mV s−1) and capacitance retention of 94% after 500 charge/discharge cycles
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