Han Guosheng, Zhou Ting, Wu Yumeng, Zhang Pengxiang, Liu Yanyan, Wu Xianli, Li Baojun
College of Chemistry, Zhengzhou University, 100 Science Road, Zhengzhou, 450001, P. R. China.
College of Science, Henan Agricultural University, 95 Wenhua Road, Zhengzhou, 450002, P. R. China.
Small. 2025 Jul;21(29):e2502145. doi: 10.1002/smll.202502145. Epub 2025 May 23.
The engineering of structure and composition is crucial and challenging for modulating electrocatalytic activity. Herein, a bifunctional electrocatalyst, CoNi@FeN/C, is designed and prepared by coupling CoNi-layered double hydroxides (CoNi-LDH) nanosheets and FeN nanoparticles on 3D N-doped biomass-derived carbon through pyrolysis and electric field induction. CoNi@FeN/C delivers remarkable bifunctional electrocatalytic activity with a narrow overpotential gap (ΔE) of only 0.63 V for ORR and OER, surpassing commercial Pt/C+RuO. Additionally, the aqueous rechargeable zinc-air batteries (RZABs) assembled with CoNi@FeN/C as a catalyst on the air electrode show a high peak power density (177.4 mW cm) and excellent durability (over 360 h). The high stability of 3D biomass-derived carbon assures the high durability of catalysts. Assistance of electric field induction ensures the uniform dispersion of CoNi-LDH nanosheets on 3D N-doped biomass-derived carbon. The interaction at the interface between two components appropriately modulates the electronic structure of hybrids via charge transfer to promote reaction kinetics. This work will provide a practical avenue to create ORR/ OER bifunctional biomass-derived catalytically active carbon hybrid catalysts for efficient RZABs.
结构和组成的工程设计对于调节电催化活性至关重要且具有挑战性。在此，通过热解和电场诱导将CoNi层状双氢氧化物（CoNi-LDH）纳米片与FeN纳米颗粒耦合在三维氮掺杂生物质衍生碳上，设计并制备了一种双功能电催化剂CoNi@FeN/C。CoNi@FeN/C具有显著的双功能电催化活性，对于氧还原反应（ORR）和析氧反应（OER）的过电位差（ΔE）仅为0.63 V，超过了商业Pt/C+RuO₂。此外，以CoNi@FeN/C作为空气电极催化剂组装的水系可充电锌空气电池（RZABs）表现出高的峰值功率密度（177.4 mW cm⁻²）和优异的耐久性（超过360小时）。三维生物质衍生碳的高稳定性确保了催化剂的高耐久性。电场诱导的辅助作用确保了CoNi-LDH纳米片在三维氮掺杂生物质衍生碳上的均匀分散。两种组分之间界面处的相互作用通过电荷转移适当调节了杂化物的电子结构，从而促进了反应动力学。这项工作将为制备用于高效RZABs的ORR/OER双功能生物质衍生催化活性碳杂化催化剂提供一条切实可行的途径。
