Journal
CHEMICAL ENGINEERING JOURNAL
Volume 380, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.122606
Keywords
Energy storage; Lamellar structure; Nitrogen-doped mesoporous carbon; Zinc-bromine flow battery
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Funding
- National Natural Science Foundation of China [21676106, 21576101]
- Science and Technology Program of Guangdong Province [2017A050506015]
- Science and Technology Program of Guangzhou [201704030065]
- China Postdoctoral Science Foundation [2019M652877]
- Fundamental Research Funds for the Central Universities
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Nitrogen-doped ordered mesoporous carbon (NOMC) is developed for the Br-2/Br- redox couple, and the effect of the characteristic dimension is investigated. The resultant carbon is extensively investigated by electron microscope, nitrogen adsorption/desorption isotherms, X-ray photoelectron spectroscopy and electrochemical methods. Salient findings are as follows. First, the template determines the morphology of the resultant carbon, which features high specific surface area. Second, the nitrogen-doped carbon, in which the heteroatom-activated carbon act as the active sites, yields a decent electrocatalytic activity towards the Br-2/Br- redox couple. The standard reaction rate constant is calculated by using rotating disk electrode method. Third, as compared with NOMC-3D, the lamellar morphology of NOMC-2D favors the exposure of the active sites and mass transfer of the reactive species, yields a high energy efficiency of 84.3% in zinc-bromine flow battery at the current density of 80 mA cm(-2). In addition, NOMC-2D shows negligible degradation after 200-cycle test at 80 mA cm(-2), revealing its superior electrochemical stability in ZBFB.
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