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Synthesis of boron/nitrogen substituted carbons for aqueous asymmetric capacitors |
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| Authors: | Timothy Tomko Ramakrishnan Rajagopalan Parvana Aksoy Henry C. Foley |
| Affiliation: | aEnergy and Mineral Engineering, The Pennsylvania State University, University Park, PA 16802, United States;bMaterials Research Institute, The Pennsylvania State University, 270 MRL Bldg., University Park, PA 16802, United States;cEnergy Institute, The Pennsylvania State University, University Park, PA 16802, United States;dDepartment of Chemical Engineering, The Pennsylvania State University, University Park, PA 16802, United States |
| Abstract: | Boron/nitrogen substituted carbons were synthesized by co-pyrolysis of polyborazylene/coal tar pitch blends to yield a carbon with a boron and nitrogen content of 14 at% and 10 at%, respectively. The presence of heteroatoms in these carbons shifted the hydrogen evolution overpotential to −1.4 V vs Ag/AgCl in aqueous electrolytes, providing a large electrochemical potential window (∼2.4 V) as well as a specific capacitance of 0.6 F/m2. An asymmetric capacitor was fabricated using the as-prepared low surface area carbon as the negative electrode along with a redox active manganese dioxide as the positive electrode. The energy density of the capacitor exceeded 10 Wh/kg at a power density of 1 kW/kg and had a cycle life greater than 1000 cycles. |
| Keywords: | Asymmetric electrochemical capacitor Boron/nitrogen carbon Coal tar pitch Manganese dioxide Polyborazylene |
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