Journal
ELECTROCHIMICA ACTA
Volume 330, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.135326
Keywords
Sensor; Supercapacitor; Co3O4; NiCo2O4
Categories
Funding
- Natural Science Foundation of China [51402151, 51408297, 51778281, 51772152]
- Natural Science Foundation of Jiangsu Province [BK20171342, BK20161493]
- QingLan Project, PAPD, Jiangsu Province
- Zijin Intelligent Program, Large Instrument and Equipment Open Fund from the Nanjing University of Science and Technology
- Fundamental Research Funds for the Central Universities [30917011309]
- Research Initiation Fund of Nanjing Normal University, China [184080H202B146]
- State Key Laboratory of Pollution Control and Resource Reuse Open Fund [PCRRF18018]
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Spinel-oxide-based mixtures have been explored for rapid and efficient biological molecule detection and energy storage applications. Porous Co3O4 nanosheets were used as growth sites, where NiCo2O4 nanorods were anchored to the Co3O4 surface to form porous Co3O4-NiCo2O4 nanosheets to achieve accurate glucose or hydrogen-peroxide monitoring and potential supercapacitor applications. The nanostructure and composition were confirmed by scanning-electron microscopy, transmission-electron microscopy and X-ray photoelectron spectroscopy. Under optimal preparation and sensing conditions, porous Co3O4-NiCo2O4 nanosheets exhibited a preeminent sensitivity towards glucose oxidation (1463.13 mu A mM(-1)cm(-2)) and hydrogen-peroxide reduction (303.42 mu A mM(-1)cm(-2)), with a low detection limit of 0.112 mu M and 0.596 mu M, respectively, and a good selectivity and reproducibility. Such porous mixture-coated Ni foam electrodes are suitable for supercapacitor performances with a high specific capacitance of 1041.2 F/g at a current density of 2 A/g and no obvious capacitance attenuation after 5000 cycles at a current density of 5 A/g, which will promote the exploration of nanocomposites in multipurpose fields. (C) 2019 Elsevier Ltd. All rights reserved.
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