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Three-dimensional Nitrogen Doped Hierarchically Porous Carbon Aerogels with Ultrahigh Specific Surface Area for High-Performance Supercapacitors and Flexible Micro-supercapacitors
Posted:2020-06-22 18:16    Column:2020

Y.F. Gao, S.H. Zheng, H.L. Fu, J.X. Ma, X. Xua, L. Guana, H.H. Wu*, Z.-S. Wu*

Carbon, 2020, Accepted.

Rational design of electrode materials with tunable pore structure and large specific surface area (SSA) are of great importance for boosting high-performance supercapacitors (SCs) and micro-supercapacitors (MSCs).Here wedevelop anitrogen doped hierarchically porous carbon aerogel (NPCA)derived from chitosan biomassviaa combined chelation reaction and freeze-drying procedures for SCs and MSCs.The NPCA exhibitsthree-dimensional (3D) reticular texture with ultrahigh SSA of 2529 m2g-1, which is highly responsible for accommodating large charge storage. Theinterconnected micro-/mesopores distributed on the continuous carbon network cancreate more adsorption sites and commodious channels for fast ion diffusion, yetoffer high electrical conductivity for rapid electron transport. As a result, theassembled symmetric SC using NPCAexhibits enhanced electrochemical performancewithenergy density of6.8 Wh kg-1at power density of 251 W kg-1.More importantly, thesolid-state flexible NPCA-MSC presents high areal capacitance of 25.6 mF cm-2, outstanding energy density of 0.78 μWh cm-2, exceptional cyclability with only 1% capacitance fading after 10000 cycles, and superior flexibility with capacitance retention of 99 %.Therefore, this biomass-derived carbon strategy will provide numerous opportunities to develop low-cost 3D micro-/mesoporous heteroatom-doped carbon aerogels for high-performance SCs and MSCs in a large scale.

Dalian Institute of Chemical Physics, CAS
457 Zhongshan Road Dalian, China 116023
E-mail: wuzs@dicp.ac.cn

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