Journal
JOURNAL OF ENERGY STORAGE
Volume 33, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.est.2020.102113
Keywords
Thermal activation; Activated carbon; Waste coffee grounds; Oxygen/nitrogen hetero-atoms; Supercapacitors
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The study converts waste coffee grounds into activated carbon using a sustainable thermal transformation method, achieving stable specific surface area and meso-microporous structure for enhanced performance in energy storage applications. The in-situ nitrogen/oxygen hetero-atom enrichment and porous structure contribute to improved specific capacitance and cycling stability of the activated carbon. This successful combination of sustainable process and utilization of waste resources presents a promising perspective for underutilized waste coffee grounds.
By leveraging the sustainable selective thermal transformation, the waste coffee grounds could be converted to a hetero oxygen/nitrogen atom induced meso-microporous activated carbon without using any pore-forming agent or dopant. N originates from the natural protein and caffeine of coffee and is implanted into the activated carbon in situ. The activated carbon gains a decent specific surface area of 580 m(2)/g with a meso-microporous structure where the average pore diameter is similar to 2.5 nm. The findings reveal the benefits of an in-situ nitrogen/oxygen hetero-atom enrichment and porous structure of activated carbon materials via thermal activation on energy storage applications. The activated carbon demonstrates the specific capacitance of 190 F/g at a 5mV/s scan rate with a retention rate of 92% after 2000 cycles. The successful combination of a sustainable process and using the waste resources as a raw material in energy storage applications suggests a great perspective for the underutilized waste coffee grounds.
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