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Strength Development and Elemental Distribution of Dolomite/Fly Ash Geopolymer Composite under Elevated Temperature

Willow Bark for Sustainable Energy Storage Systems

Institute of Paper, Pulp and Fibre Technology, Graz University of Technology, Inffeldgasse 23, 8010 Graz, Austria
Department of Bioproducts and Biosystems, Aalto University, Vuorimiehentie 1, 02150 Espoo, Finland
Institute for Chemistry and Technology of Materials, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria
Authors to whom correspondence should be addressed.
Materials 2020, 13(4), 1016;
Received: 10 December 2019 / Revised: 4 February 2020 / Accepted: 11 February 2020 / Published: 24 February 2020
(This article belongs to the Section Biomaterials)
Willow bark is a byproduct from forestry and is obtained at an industrial scale. We upcycled this byproduct in a two-step procedure into sustainable electrode materials for symmetrical supercapacitors using organic electrolytes. The procedure employed precarbonization followed by carbonization using different types of KOH activation protocols. The obtained electrode materials had a hierarchically organized pore structure and featured a high specific surface area (>2500 m2 g−1) and pore volume (up to 1.48 cm3 g−1). The assembled supercapacitors exhibited capacitances up to 147 F g−1 in organic electrolytes concomitant with excellent cycling performance over 10,000 cycles at 0.6 A g−1 using coin cells. The best materials exhibited a capacity retention of 75% when changing scan rates from 2 to 100 mV s−1. View Full-Text
Keywords: willow bark; upcycling; carbon activation; electrode formation; supercapacitors; organic electrolytes willow bark; upcycling; carbon activation; electrode formation; supercapacitors; organic electrolytes
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MDPI and ACS Style

Hobisch, M.A.; Phiri, J.; Dou, J.; Gane, P.; Vuorinen, T.; Bauer, W.; Prehal, C.; Maloney, T.; Spirk, S. Willow Bark for Sustainable Energy Storage Systems. Materials 2020, 13, 1016.

AMA Style

Hobisch MA, Phiri J, Dou J, Gane P, Vuorinen T, Bauer W, Prehal C, Maloney T, Spirk S. Willow Bark for Sustainable Energy Storage Systems. Materials. 2020; 13(4):1016.

Chicago/Turabian Style

Hobisch, Mathias A., Josphat Phiri, Jinze Dou, Patrick Gane, Tapani Vuorinen, Wolfgang Bauer, Christian Prehal, Thaddeus Maloney, and Stefan Spirk. 2020. "Willow Bark for Sustainable Energy Storage Systems" Materials 13, no. 4: 1016.

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