期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 9, 期 2, 页码 1192-1206出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ta06756c
关键词
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资金
- Spanish Ministry of Economy, Industry and Competitiveness [ENE2017-89210-C2-1-R, BES-2017-081652]
- AGAUR of Generalitat de Catalunya [2017 SGR 1086, 2017 SGR 1771]
- Spanish Ministry of Economy and Competitiveness, through Severo Ochoa FUNFUTURE [CEX2019-000917-S]
- CSIC Open Access Publication Support Initiative through its Unit of Information Resources for Research (URICI)
The research focuses on investigating novel composite materials to improve the energy storage performance of electrochemical capacitors. By combining different types of materials, synergistic effects are crucial for enhancing performance. Through RIMAPLE technique, electrodes composed of a mixture of carbon nanoentities, graphene oxide, cerium, and manganese oxides were fabricated, showing excellent performance and stability in symmetric electrochemical capacitors.
Novel composite materials are being investigated for improving the energy storage performance of electrochemical capacitors. For this goal, synergistic effects via the combination of diverse types of materials are crucial. In this work, electrodes composed of reduced graphene oxide, multiwall carbon nanotubes, as well as cerium and manganese oxides were fabricated through reactive inverse matrix-assisted pulsed laser evaporation (RIMAPLE). UV-pulsed laser irradiation of frozen aqueous dispersions containing graphene oxide sheets, carbon nanotubes, and ceria nanoentities, besides manganese acetate precursor, led to the simultaneous chemical transformation and co-deposition of hybrid electrodes onto flexible metallic substrates via photothermal and photochemical processes. Thorough morphological and compositional studies of the electrodes demonstrated the laser-induced reduction of graphene oxide, besides the crystallization of a mixture of cerium and manganese oxide nanostructures decorating the carbon nanoentities during the deposition process. Electrochemical analyses revealed a remarkable improvement of performance with the combination of electrochemical double layer in the porous nanocarbon framework with pseudocapacitance from the oxide nanostructures, obtaining excellent volumetric capacitances of up to 140 F cm(-3) at 10 mV s(-1) with the combination of all four materials. The attained results are the best ones yet published regarding RIMAPLE of hybrid nanocarbon-based electrodes with micrometric thickness. Finally, symmetric electrochemical capacitors were fabricated using aqueous electrolyte, revealing excellent stability upon tens of thousands of charge-discharge cycles.
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