Jin Tianxu, Nie Junli, Dong Mei, Chen Binling, Nie Jun, Ma Guiping
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, People's Republic of China.
College of Engineering, Mathematics and Physical Science, University of Exeter, Exeter, EX4 4QF, UK.
Nanomicro Lett. 2022 Dec 31;15(1):26. doi: 10.1007/s40820-022-00959-6.
Developing high-performance and low-cost electrocatalysts is key to achieve the clean-energy target. Herein, a dual regulation method is proposed to prepare a 3D honeycomb-like carbon-based catalyst with stable Fe/Co co-dopants. Fe atoms are highly dispersed and fixed to the polymer microsphere, followed by a high-temperature decomposition, for the generation of carbon-based catalyst with a honeycomb-like structure. The as-prepared catalyst contains a large number of Fe/Co nanoparticles (Fe/Co NPs), providing the excellent catalytic activity and durability in oxygen reduction reaction, oxygen evolution reaction and hydrogen evolution reaction. The Zn-air battery assembled by the as-prepared catalyst as air cathode shows a good charge and discharge capacity, and it exhibits an ultra-long service life by maintaining a stable charge and discharge platform for a 311-h cycle. Further X-ray absorption fine structure characterization and density functional theory calculation confirms that the Fe doping optimizes the intermediate adsorption process and electron transfer of Co.
开发高性能、低成本的电催化剂是实现清洁能源目标的关键。在此，提出了一种双重调控方法来制备具有稳定铁/钴共掺杂的三维蜂窝状碳基催化剂。铁原子高度分散并固定在聚合物微球上，随后进行高温分解，以生成具有蜂窝状结构的碳基催化剂。所制备的催化剂包含大量的铁/钴纳米颗粒（Fe/Co NPs），在氧还原反应、析氧反应和析氢反应中具有优异的催化活性和耐久性。以所制备的催化剂作为空气阴极组装的锌空气电池具有良好的充放电容量，并且通过在311小时的循环中保持稳定的充放电平台而表现出超长的使用寿命。进一步的X射线吸收精细结构表征和密度泛函理论计算证实，铁掺杂优化了钴的中间吸附过程和电子转移。
