Chen Haowen, Liu Yijiang, Liu Bei, Yang Mei, Li Huaming, Chen Hongbiao
College of Chemistry, Xiangtan University, Xiangtan 411105, Hunan Province, P. R. China.
Key Laboratory of Polymeric Materials & Application Technology of Hunan Province, Key Laboratory of Advanced Functional Polymeric Materials of College of Hunan Province, and Key Lab of Environment-Friendly Chemistry and Application in Ministry of Education, Xiangtan University, Xiangtan 411105, Hunan Province, P. R. China.
Nanoscale. 2022 Sep 2;14(34):12431-12436. doi: 10.1039/d2nr03370d.
Bifunctional oxygen catalysts with excellent catalytic activity and durability towards both oxygen reduction and oxygen evolution reactions (ORR/OER) are pivotal for long-term rechargeable Zn-air batteries. Herein, we report a spherical carbon decorated with FeP and CoP nanoparticles (denoted as FeCoP/NPC) as an ORR/OER bifunctional electrocatalyst for rechargeable Zn-air batteries. HCTCz@Fe/Co-PA is first produced by the modification of phytic acid (PA) onto (into) a porous cross-linked polymeric sphere of poly(bis(-carbazolyl)-1,2,4,5-tetrazine) (HCTCz), followed by chelating with metal ions (, Fe and Co). The subsequent pyrolysis yields FeCoP/NPC, which shows prominent activity and reliability for the ORR and OER due primarily to the synergistic effect of FeP and CoP active sites and N/P co-doped carbon. The aqueous Zn-air battery assembled with FeCoP/NPC provides high specific capacity and peak power density. Notably, the constructed Zn-air battery can be repetitively charged and discharged for 1200 h at 5 mA cm. In addition, a flexible solid-state Zn-air battery made from FeCoP/NPC exhibits a power density of 74 mW cm and repeatedly works for 90 h at 2 mA cm. This work opens up an avenue for the preparation of highly efficient bifunctional electrocatalysts for Zn-air batteries considering the extensive N-rich polymer precursors and various metal phosphide nanoparticles.
对氧还原和析氧反应（ORR/OER）均具有优异催化活性和耐久性的双功能氧催化剂对于长期可充电锌空气电池至关重要。在此，我们报道了一种用FeP和CoP纳米颗粒修饰的球形碳（表示为FeCoP/NPC）作为可充电锌空气电池的ORR/OER双功能电催化剂。首先通过将植酸（PA）修饰到（或引入）聚（双（咔唑基）-1,2,4,5-四嗪）（HCTCz）的多孔交联聚合物球上制备HCTCz@Fe/Co-PA，随后与金属离子（Fe和Co）螯合。随后的热解产生FeCoP/NPC，由于FeP和CoP活性位点以及N/P共掺杂碳的协同作用，其对ORR和OER表现出显著的活性和可靠性。用FeCoP/NPC组装的水系锌空气电池具有高比容量和峰值功率密度。值得注意的是，构建的锌空气电池在5 mA cm下可重复充放电1200 h。此外，由FeCoP/NPC制成的柔性固态锌空气电池表现出74 mW cm的功率密度，并在2 mA cm下重复工作90 h。考虑到广泛的富氮聚合物前驱体和各种金属磷化物纳米颗粒，这项工作为制备用于锌空气电池的高效双功能电催化剂开辟了一条途径。
