Liu Huimin, Wang Chen, Ai Xinbo, Wang Binquan, Bian Yingqi, Wang Geyu, Wang Yongfei, Hu Zhizhi, Zhang Zhiqiang
School of Chemical Engineering, University of Science and Technology Liaoning 185 Qianshan Zhong Road, Anshan 114051, PR China.
School of Materials and Metallurgy, University of Science and Technology Liaoning Anshan, Liaoning 114051, PR China.
J Colloid Interface Sci. 2023 Dec;651:525-533. doi: 10.1016/j.jcis.2023.08.007. Epub 2023 Aug 3.
Developing iron-based single-atom catalysts (Fe SACs) with low cost, high activity and stability is vital for commercialising sustainable energy technologies. However, accurately controlling and identifying structure-activity relationships of Fe SACs remains a significant challenge. Herein, we report Fe/N co-doped carbon nanofiber membranes with highly exposed Fe-N sites (Fe/NCNFs), synthesized by electrospinning and pyrolysis. The three-dimensional (3D) hierarchical structure and atomically dispersed pyrrole-type Fe (III)-N active sites provide the as-prepared catalyst with a positive half-wave potential of 0.87 V and an ultralow Tafel slope of 53 mV dec. As an air cathode catalyst for liquid Zn - air batteries, it delivers a high open-circuit voltage (1.474 V), a large peak power density (190 mW cm) and a high durability of 2000 cycles at 5 mA cm. As a self-standing air cathode, the as-assembled solid-state Zn - air batteries also show stable cycling with a small discharge/charge voltage gap of 0.65 V, indicating great prospects for developing portable zinc - air batteries.
开发具有低成本、高活性和稳定性的铁基单原子催化剂（Fe SACs）对于可持续能源技术的商业化至关重要。然而，准确控制和识别Fe SACs的结构-活性关系仍然是一项重大挑战。在此，我们报道了通过静电纺丝和热解合成的具有高度暴露的Fe-N位点的Fe/N共掺杂碳纳米纤维膜（Fe/NCNFs）。三维（3D）分级结构和原子分散的吡咯型Fe（III）-N活性位点为所制备的催化剂提供了0.87 V的正半波电位和53 mV dec的超低塔菲尔斜率。作为液体锌-空气电池的空气阴极催化剂，它具有1.474 V的高开路电压、190 mW cm的大峰值功率密度以及在5 mA cm下2000次循环的高耐久性。作为自立式空气阴极，组装好的固态锌-空气电池也显示出稳定的循环，放电/充电电压差小至0.65 V，这表明开发便携式锌-空气电池具有广阔前景。
