Jeong, Yeseul Shin, Hyeon-Ji Oh, Gwangeon Alfaruqi, Muhammad Hilmy Ahmed, Mohammad Shamsuddin Mathew, Vinod Jung, Hun-Gi Kim, Jaekook Hwang, Jang-Yeon 2024-01-19T11:30:06Z 2024-01-19T11:30:06Z 2022-09-02 2022-09 2050-7488 https://pubs.kist.re.kr/handle/201004/114722 Owing to high natural abundance and relatively low redox potential of potassium (K), the K-ion battery (KIB) is a compelling substitute technology for the currently used lithium-ion battery (LIB). In this study, we propose a natural eco-friendly nitrogen (N)-doped porous carbon matrix from waste coffee grounds, which are abundantly available as biomass for KIB anode application. High electrical conduction and effective doping of active N atoms with lone electron pairs can be achieved through simple carbonization. Heteroatom N exists in multiple forms, such as graphitic N, pyridinic N, and pyrrolic N, all of which have lone pair electrons. The NCcoff-800 is optimized mesoporous structure with a good balance of graphitic N and coexistence of amorphous and graphitic carbon, allowing the highly reversible K storage properties to be preserved. To ensure practical utilization of NCcoff-800 as an anode, we assembled K-ion full-cells using a high-voltage Prussian blue/graphene (PB/G) composite as the cathode, which exhibited a high specific capacity of 90 mA h g(-1) at 0.1C and long-term cycling stability over 1000 cycles at 0.5C. This study suggests that an affordable, eco-friendly, high-performance practical KIB, providing excellent electrochemical properties, could be developed using an inexpensive anode derived from used coffee grounds together with a PB/G cathode. English Royal Society of Chemistry A nitrogen-doped amorphous/graphitic hybrid carbon material derived from a sustainable resource for low-cost K-ion battery anodes Article 10.1039/d2ta04195b 1 Journal of Materials Chemistry A, v.10, no.35, pp.18050 - 18060 Journal of Materials Chemistry A 10 35 18050 18060 N scie scopus 000839593400001 Chemistry, Physical Energy & Fuels Materials Science, Multidisciplinary Chemistry Energy & Fuels Materials Science Article POTASSIUM-ION POROUS CARBON CATHODE MATERIALS OXYGEN REDUCTION HARD CARBON PERFORMANCE GRAPHITE GRAPHENE SODIUM PHOSPHORUS