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The on-demand engineering of metal-doped porous carbon nanofibers as efficient bifunctional oxygen catalysts for high-performance flexible Zn–air batteries
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020/03/17 , DOI: 10.1039/c9ta13651g
Khang Ngoc Dinh 1, 2, 3, 4, 5 , Zengxia Pei 6, 7, 8, 9 , Ziwen Yuan 6, 7, 8, 9 , Van Chinh Hoang 6, 7, 8, 9 , Li Wei 6, 7, 8, 9 , Qianwei Huang 7, 8, 9, 10 , Xiaozhou Liao 7, 8, 9, 10 , Chuntai Liu 11, 12, 13, 14, 15 , Yuan Chen 6, 7, 8, 9 , Qingyu Yan 1, 2, 3, 4, 5
Affiliation  

Developing efficient bifunctional oxygen electrocatalysts is an essential step in the realization of flexible metal–air batteries to power emerging flexible electronics. Herein, we use a dual-functional metal template to achieve the on-demand control of dispersed active M–N–C sites, porous structures, and surface wettability in a carbon nanofiber catalyst. The resulting engineered carbon nanofibers possess a high surface area (612.2 m2 g−1), greatly improved accessibility to active catalytic sites, excellent surface hydrophilicity, and enhanced Fe(Co)–Nx/C interactions, demonstrating excellent bifunctional catalytic activities for both oxygen reduction and evolution reactions with long-term stability. When employed in air electrodes for aqueous rechargeable Zn–air batteries (ZABs), the ZABs show a high specific capacity (740 mA h gZn−1), excellent rate capabilities, and, in particular, exceptional cycling stability over 2000 cycles. Furthermore, flexible ZABs fabricated using air electrodes containing this catalyst and a hydrogel electrolyte demonstrate outstanding performance, with a high open circuit potential (1.42 V), large peak power density (188.6 mW cm−2), high specific capacity (647 mA h gZn−1), excellent round-trip efficiency of >64% over 500 cycles, and performance retention under various mechanical deformation processes. This unique and tunable carbon nanofiber engineering approach can create noble-metal-free high-performance bifunctional oxygen catalysts, outperforming Pt/C–IrO2 and bringing us one step closer to realizing a reliable energy storage solution for future flexible electronics.

中文翻译:

金属掺杂多孔碳纳米纤维的按需工程设计,作为高性能柔性Zn-air电池的高效双功能氧催化剂

开发高效的双功能氧电催化剂是实现柔性金属-空气电池以为新兴的柔性电子设备供电的必不可少的步骤。在本文中,我们使用双功能金属模板来实现对碳纳米纤维催化剂中分散的活性M–N–C位点,多孔结构和表面润湿性的按需控制。所得的工程碳纳米纤维具有较高的表面积(612.2 m 2 g -1),极大地改善了对活性催化部位的可达性,出色的表面亲水性和增强的Fe(Co)–N x/ C相互作用,具有出色的双功能催化活性,对氧的还原和析出反应均具有长期稳定性。当用于水性可充电锌空气电池(ZAB)的空气电极中时,ZAB表现出高的比容量(740 mA hg Zn -1),出色的倍率性能,尤其是在2000次循环中具有出色的循环稳定性。此外,使用包含该催化剂和水凝胶电解质的空气电极制造的柔性ZAB具有出色的性能,具有高的开路电位(1.42 V),大的峰值功率密度(188.6 mW cm -2),高的比容量(647 mA hg Zn)-1),在500次循环中具有> 64%的出色往返效率,并在各种机械变形过程下保持性能。这种独特且可调谐的碳纳米纤维工程方法可以制造出不含贵金属的高性能双功能氧催化剂,性能优于Pt / C–IrO 2,使我们向实现未来柔性电子产品的可靠储能解决方案迈进了一步。
更新日期:2020-04-15
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