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Upcycling end of lithium cobalt oxide batteries to electrocatalyst for oxygen reduction reaction in direct methanol fuel cell via sustainable approach

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Journal of Energy Chemistry 2023年第7期82卷 148-157,I0004页

作者： Keyru Serbara Bejigo kousik bhunia Jungho Kim Chaehyeon Lee Seoin Back Sang-Jae Kim Nanomaterials&System Lab Major of Mechatronics EngineeringFaculty of Applied Energy SystemJeju National UniversityJeju 63243Republic of Korea Nanomaterials&System Lab Major of Mechanical System EngineeringCollege of EngineeringJeju National UniversityJeju 63243Republic of Korea Research Institute of New Energy Industry(RINEI) Jeju National UniversityJeju 63243Republic of Korea Department of Chemical and Biomolecular Engineering Institute of Emergent MaterialsSogang UniversitySeoul 04107Republic of Korea

Recycling spent lithium-ion batteries(SLIBs)has become essential to preserve the environment and reclaim vital resources for sustainable *** typical SLIBs recycling concentrated on separating valuable components had limitations,including high energy consumption and complicated separation *** work suggests a safe hydrometallurgical process to recover usable metallic cobalt from depleted LiCoO_(2)batteries by utilizing citric acid as leachant and hydrogen peroxide as an oxidizing agent,with ethanol as a selective precipitating *** anode graphite was also recovered and converted to graphene oxide(GO).The above components were directly resynthesized to cobaltintegrated nitrogen-doped graphene(Co@NG).The Co@NG showed a decent activity towards oxygen reduction reaction(ORR)with a half-wave potential of 0.880 V ***,almost similar to Pt/C(0.888 V ***)and with an onset potential of 0.92 V *** metal-nitrogen-carbon(Co-N-C)having the highest nitrogen content has decreased the barrier for ORR since the reaction was enhanced for Co@NG-800,as confirmed by density functional theory(DFT)*** Co@NG cathode catalyst coupled with commercial Pt-Ru/C as anode catalyst exhibits excellent performance for direct methanol fuel cell(DMFC)with a peak power density of 34.7 mW cm^(-2)at a discharge current density of120 m A cm^(-2)and decent stability,indicating the promising utilization of spent battery materials in DMFC ***,lithium was recovered from supernatant as lithium carbonate by coprecipitation *** work avoids sophisticated elemental separation by utilizing SLIBs for other renewable energy applications,lowering the environmental concerns associated with recycling.

关键词： Density functional theory(DFT) Direct methanol fuel cell Leaching Nitrogen doping Oxygen reduction reaction Recycling Spent lithium-ion batteries

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