Single Step, Direct Pyrolysis Assisted Synthesis of Nitrogen-Doped Porous Carbon Nanosheets Derived from Bamboo wood for High Energy Density Asymmetric Supercapacitor

Gunasekaran, Sivagaami Sundari and Gopalakrishnan, Arthi and Subashchandrabose, Raghu and Badhulika, Sushmee (2021) Single Step, Direct Pyrolysis Assisted Synthesis of Nitrogen-Doped Porous Carbon Nanosheets Derived from Bamboo wood for High Energy Density Asymmetric Supercapacitor. Journal of Energy Storage, 42. pp. 1-8. ISSN 2352-152X

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Abstract

Herein, we report a scalable, large-area synthesis of nitrogen-doped carbon nanosheets (N-AC) from bamboo biomass using KOH and urea as the activating and doping agent, respectively, for high performance asymmetric supercapacitor applications. The carbonization of the biomass bamboo at 300 °C for 2 h yields N-AC0 (char) while activation at 900°C for 2 h under inert atmosphere yields N-AC. The detailed characterization of N-AC revealed the significance of heteroatom doping for the supercapacitor application. The N-AC electrode delivered the half-cell specific capacitance of 475 Fg−1 at 1 Ag−1. The assembled asymmetric N-AC||N-AC0 supercapacitor device delivered the highest specific capacitance of 296 Fg−1 at 1 Ag−1 with specific energy of 42 Whkg−1 at specific power of 4500 Wkg−1, which are very high compared to other reported nitrogen-doped carbon materials. This enhanced performance can be attributed to the synergistic effect of larger specific surface area (of 769.714 m2g−1) and hetero-atom (N) doping, which helped in rapid charge-transfer, improved electrical conductivity and efficient electrode-electrolyte interactions. Furthermore, the N-AC asymmetric supercapacitor device works until 1.2 V with 6 M KOH as with 150% capacitance retention over 10,000 charge-discharge cycles. Thus, the strategy presented here provides new directions to synthesize low cost, green, sustainable electrodes for high energy supercapacitor applications. © 2021 Elsevier Ltd

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