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Phase-Transition-Induced Co-Fe2O3 Nanosheets from Upcycling Spent LiFePO4 for Oxygen Evolution
Chang Wang1, Liuyang Zha1, Qiangchun Liu1
1Anhui Province Key Laboratory of Pollutant Sensitive Materials and Environmental Remediation, Huaibei Normal University, Huaibei, Anhui235000, China.
Abstract:
Spent LiFePO4 (LFP) batteries were upcycled into Co-modified Fe2O3 nanosheets (sFe2O3@Co) through an oxidative reconstruction, selective acid leaching, and Co incorporation. Phase-transition-induced confined growth generated defect-rich ultrathin Fe2O3 nanosheets, while Co doping reconstructed the local electronic structure and accelerated the charge transfer. As a result, sFe2O3@Co exhibited excellent OER activity, requiring only 265 mV at 10 mA cm-2 with a Tafel slope of 28.6 mV dec-1 and maintaining 72.6% activity after 350 h. An AEM electrolyzer achieved 100 mA cm-2 at 1.62 V. A techno-economic analysis further demonstrated the superior value of this upcycling strategy over conventional recycling routes.
