Jiao Miaolun, Zhang Qi, Ye Chenliang, Gao Runhua, Dai Lixin, Zhou Guangmin, Cheng Hui-Ming
Shenzhen Geim Graphene Center, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China.
College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, China.
ACS Nano. 2022 Aug 23;16(8):13223-13231. doi: 10.1021/acsnano.2c06826. Epub 2022 Aug 10.
The recycling of spent lithium-ion batteries (LIBs) has become a necessity for recovering valuable resources and protecting the environment to support sustainable development. We report the design of a highly efficient CoFe/C catalyst by combining the Co and Fe wastes from spent LIBs with sawdust-derived carbon, which were cathode materials in zinc-air batteries (ZABs). As a result of the electrostatic attraction between the Co/Fe cations and the hydroxyl groups in sawdust, CoFe nanoparticles are uniformly dispersed in the CoFe/C catalyst after annealing. The Fe atoms in the CoFe nanoparticles are all isolated into single sites by the Co atoms, which redistribute the electrons in the CoFe/C catalyst. The catalyst produced a Pt-like dissociative mechanism, contributing to an excellent oxygen reduction reaction performance. After assembly in ZABs, the CoFe/C catalyst cathode exhibits a long cycling stability of 350 h and an impressive power density of 199.2 mW cm. The CoFe/C catalyst cathode has also been used in flexible ZABs to power LEDs or charge a mobile phone. The work combines spent LIBs with sawdust to fabricate high-performance catalysts, which could reduce environmental pollution and realize high economic value.
废旧锂离子电池（LIBs）的回收利用已成为回收宝贵资源和保护环境以支持可持续发展的必要举措。我们报告了一种高效CoFe/C催化剂的设计，该催化剂通过将废旧LIBs中的Co和Fe废料与锯末衍生碳相结合而成，这些材料是锌空气电池（ZABs）中的阴极材料。由于Co/Fe阳离子与锯末中的羟基之间的静电吸引，CoFe纳米颗粒在退火后均匀分散在CoFe/C催化剂中。CoFe纳米颗粒中的Fe原子全部被Co原子隔离成单原子位点，这重新分布了CoFe/C催化剂中的电子。该催化剂产生了类似Pt的解离机制，有助于实现优异的氧还原反应性能。在组装到ZABs中后，CoFe/C催化剂阴极表现出350小时的长循环稳定性和199.2 mW cm的令人印象深刻的功率密度。CoFe/C催化剂阴极还被用于柔性ZABs中为LED供电或为手机充电。这项工作将废旧LIBs与锯末结合起来制造高性能催化剂，这可以减少环境污染并实现高经济价值。
