The efficient exploitation and utilization of low‐cost and biomass‐derived carbon materials will play an active role in developing sustainable energy storage systems. However, the difficult morphology control and incomplete activation limits their pervasive application in electrochemical energy storage. Inspired by the famous Chinese folk handicraft of sugar‐figure blowing, biomass‐derived carbon aerogels (GCA) with 2 D graphene‐like thin nanosheets were fabricated by a simple chemical blowing strategy from a viscous agaric solution obtained through hydrothermal treatment of agaric. A chemical blowing agent (NH4Cl) was used to effectively exfoliate the bulk biomass‐derived carbon flake into 2 D graphene‐like nanosheets, which resulted in a highly porous structure and high specific area (2200 m2 g−1) after the activation process. As a result, a high specific capacitance of 340 F g−1 at 3 A g−1 and a high specific energy of 25.5 Wh kg−1 at a power density of 2 kW kg−1 was obtained for the GCA electrode, which can be attributed to the abundant electrochemically active surfaces, short ion transport paths, and effective electrolyte infiltration.. This work demonstrates an effective and low‐cost strategy to prepare hierarchical and well‐organized porous biomass carbon materials with graphene‐like nanosheets for high‐performance supercapacitors.
Natural biomass carbon materials has received increasing attention due to its fast regeneration features, low-cost, and wide distribution. Yolk-shell structure materials with tunable internal void spaces could greatly improve the...
The
capacitive properties of asymmetric supercapacitors (ASCs)
are inseparable from the development of anode and cathode materials,
which usually require high accessible surface area and uniform porous
distribution. Herein, a simple and economical “two for one”
strategy is introduced for the simultaneous synthesis of microscale
porous MnO2 microcubes (PMMs) and porous carbon microcubes
(PCMs) derived from a single precursor cubic MnCO3/biocarbon
(CM) which are prepared by natural agaric. Benefiting from a high
specific surface area, delicate construction, and adequate mesoporous
distribution, PCMs and PMMs could help to realize fast ion diffusion
and easy ion accessibility. As expected, microscale PCM anode and
PMM cathode materials exhibit superior capacitive performances, including
high specific capacitance and impressive rate performance in a three-electrode
system, respectively. Moreover, the assembled ASCs physical device
PCM//PMM presents a high energy density (46.1 Wh kg–1 at 1.0 kW kg–1) and an excellent long-term cyclability
(91% capacitance retention after 10 000 cycles at 1.0 A g–1). Therefore, the two-for-one strategy not only provided
a simple and effective method to prepare high-performance electrode
materials for ASCs, but also it is of great significance for natural
biomass to achieve multidirectional applications and effectively replace
commercial carbon sources from fossil fuels.
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