Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 45, Issue 42, Pages 22223-22231Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2019.08.059
Keywords
Ruthenium oxide; Tantalum oxide; Polyaniline; Composite electrode; Supercapacitor
Categories
Funding
- Ministry of Science and Technology of Republic of China [108-2221-E-224-049-MY3]
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RuO2-Ta2O5 electrode covered with polyaniline (PANI) was prepared by sintering and electrodeposition. X-ray photoelectron spectroscopy confirmed the presence of RuO2-Ta2O5 and PANI and the strong interaction between RuO2-Ta2O5 and PANI in the RuO2-Ta2O5/PANI composite. The crystalline structure of RuO2-Ta2O5/PANI was verified by XRD. SEM analysis revealed that the RuO2-Ta2O5/PANI electrode had a nano-fibrous morphology with a crystal plane and some pores. The supercapacitive performance of RuO2-Ta2O5/PANI was evaluated by cyclic voltammetry and charge-discharge chronopotentiometry. RuO2-Ta2O5/PANI had a high specific capacitance (428 F/g), specific energy (26.7 Wh/kg at a discharge current density of 0.5 mA/cm(2)), and power density (2.4 kW/kg at a discharge current density of 4.0 mA/cm(2)). The attractive capacitive properties of RuO2-Ta2O5/PANI may be attributed to the porous morphology of RuO2-Ta2O5 covered with PANI. In addition, the as-prepared RuO2-Ta2O5 and RuO2-Ta2O5/PANI electrodes had Tafel slopes of -55.8 and -69.2 mV/dec, respectively, which make them potential H-2 evolution electrocatalysts. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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