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Type: Journal article
Title: Dual carbon potassium-ion capacitors: biomass-derived graphene-like carbon nanosheet cathodes
Author: Pham, H.D.
Mahale, K.
Hoang, T.M.L.
Mundree, S.G.
Gomez-Romero, P.
Dubal, D.P.
Citation: ACS Applied Materials and Interfaces, 2020; 12(43):48518-48525
Publisher: ACS Publications
Issue Date: 2020
ISSN: 1944-8244
Statement of
Hong Duc Pham, Kiran Mahale, Thi My Linh Hoang, Sagadevan G. Mundree, Pedro Gomez-Romero and Deepak P. Dubal
Abstract: Potassium-ion storage devices are attracting tremendous attention for wide-ranging applications on account of their low cost, fast charge transport in electrolytes, and large working voltage. However, developing cost-effective, high-energy electrodes with excellent structural stability to ensure long-term cycling performance is a major challenge. In this contribution, we have derived two different forms of carbon materials from almond shells using different chemical treatments. For instance, hard carbon (HC) and graphene-like activated carbon (AC) nanosheets are developed by employing simple carbonization and chemical activation routes, respectively. The resultant hard carbon (AS-HC) and activated carbon (AS-AC) exhibit outstanding electrochemical performance as negative and positive electrodes in a potassium-ion battery (KIB), respectively, through their tailor-made surface properties. These promising benefits pave a way to construct a biomass-derived carbon potassium-ion capacitor (KIC) by employing AS-HC as the negative electrode and AS-AC as the positive electrode in a K-based electrolyte. The as-fabricated KIC delivers a reasonable specific energy of 105 Wh/kg and excellent cycling life with negligible capacitance fading over 10 000 cycles. This "waste-to-wealth" approach can promote the development of sustainable KICs at low cost and inspire their use for fast-rate K-based energy storage applications.
Keywords: biomass waste
graphene-like carbon
hard carbon
high energy
high power
potassium-ion capacitor
Rights: © 2020 American Chemical Society
DOI: 10.1021/acsami.0c12379
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