Biomass based N-doped hierarchical porous carbon nanosheets for all-solid-state supercapacitors

By Mingfeng Chen, Dan Yu, Xiaozhong Zheng, Xiaoping Dong. Journal of Energy Storage, 2019

164 citations recorded by the source corpus.

Abstract Biomass is regarded as sustainable and low-cost precursors of porous carbons for electrochemical energy storage and conversion due to their varied architecture and plentiful heteroatom containing. We herein developed a hierarchical N-doped porous carbon nanosheet material from soybean milk by employing simultaneous hard-template and KOH activation strategy. Hard-template of CaCO3 nanospheres, KOH activation and the melt template of potassium species respectively result in the formation of macropores, micropores and nanosheet-like morphology. Moreover, abundant nitrogen and oxygen elements in precursor bring a high heteroatom percentage in resultants, which don’t contribute psuedocapacitance but also promote electron transfer and conductivity. The obtained carbons exhibit good charge storage capacity with a specific capacitance of 240.7 F g−1 (1 A g−1) and the excellent retention of initial specific capacitance (92.2% to 20 A g−1) that is much higher than those of biomass-based porous carbons. A symmetric all-solid-state supercapacitor using KOH/PVA as electrolyte has a specific capacitance of 149.3 F g−1 (0.5 A g−1), and good cycling stability with capacitance retention of 89.3% after 5000 cycles. The device displays energy density of 10.2 Wh kg−1 at a power density of 351 W kg−1, and retains 8.2 Wh kg−1 even at a high power density of 19,600 W kg−1 with a wide voltage window of 1.4 V.

Subfields: Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/92d491de115f876308a7fcc4499da24e8f646fa0

Citations in the corpus