Journal
MATERIALS TODAY COMMUNICATIONS
Volume 24, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.mtcomm.2020.101045
Keywords
Free-standing electrode; Graphitized wood; Asymmetric supercapacitor
Categories
Funding
- National Key R&D Program of China [2016YFA0202900]
- National Natural Science Foundation of China [51672173, 51801121, 51572169]
- Key Program for International S&T Cooperation Program of China [2017YFE0113000]
- Science and Technology Commission of Shanghai Municipality [17JC1400700, 18JC1410500, 18ZR1421000, 18520744700]
- Science and Technology Planning Project of Guangdong Province [2016A010103018]
- Shanghai Research institute of criminal science and technology [2016XCWZK15]
- Medical-Engineering Cross Research Funding of SJTU [YG2017QN11]
- NSERC CGS-D scholarship
- NSERC-MSFSS scholarship
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A free-standing electrode with hierarchical pores and graphite surface is derived from wood pellet via a catalytic graphitization. The aligned microchannels of natural wood and the high conductivity of graphite has enabled fast ionic and electronic transport. The high porosity leads to a large surface area for the deposition of redox active materials. After an electrodeposition of Ni(OH)(2) and Co(OH)(2) on the graphitized wood, the electrode exhibits a high areal capacity without significant degradation in the electrochemical performance. An asymmetric supercapacitor, with a graphitized wood as the negative electrode and a Ni(OH)(2)/Co(OH)(2) deposited wood as the positive electrode, shows a high areal capacitance of 2 409 m F/cm(2), a high energy density of 0.75 mWh/cm(2) at a power density of 0.750 mW/cm(2). This high performance, free-standing and biodegradable wood-derived asymmetric supercapacitor demonstrates promising applications as energy storage devices.
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