Neuron-inspired design of hierarchically porous carbon networks embedded with single-iron sites for efficient oxygen reduction

作     者：Yanwei Zhu Xuxu Wang Jianqiao Shi Lang Gan Binbin Huang Li Tao Shuangyin Wang Yanwei Zhu;Xuxu Wang;Jianqiao Shi;Lang Gan;Binbin Huang;Li Tao;Shuangyin Wang

作者机构：State Key Laboratory of Chemo/Bio-Sensing and ChemometricsCollege of Chemistry and Chemical EngineeringAdvanced Catalytic Engineering Research Center of the Ministry of EducationHunan UniversityChangsha 410082China College of Environmental science and EngineeringHunan UniversityChangsha 410082China 

出 版 物：《Science China Chemistry》 (中国科学（化学英文版）)

年 卷 期：2022年第65卷第7期

页      面：1445-1452页

核心收录：

学科分类：0808[工学-电气工程] 081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 

基　　金：supported by the National Key R&D Program of China (2020YFA0710000) the National Natural Science Foundation of China (21825201 and U19A2017) the China Postdoctoral Science Foundation (2020M682541) the Science and Technology Innovation Program of Hunan Province, China (2020RC2020) Changsha Municipal Natural Science Foundation (kq2007009)。 

主　　题：Electrospinning single-atom catalysts oxygen reduction reaction hierarchical porous structure zinc–air battery 

摘      要：The rational structure design and active-site regulation of catalysts is crucial for high energy output. Herein, B, F co-doped Fe–N–C embedded in a flexible and free-standing hierarchical porous carbon framework(Fe–SA–FPCS) was reported. Owing to the synergism of optimized intrinsic activity, fast mass transfer and well exposed active sites, the Fe–SA–FPCS exhibits a high halfwave potential(E1/2=0.89 V vs. RHE) and small Tafel slope(66 m V dec^(-1)). Theoretical calculations uncover that B, F co-doping could accelerate the desorption of OH* on Fe sites, which can effectively increase oxygen reduction reaction activity. As the cathode for Zn–air batteries(ZABs), Fe–SA–FPCS demonstrates a high open-circuit voltage(1.51 V), large peak power density(168.4 m W cm^(-2)) and excellent stability. The assembled flexible solid-state ZAB exhibits excellent stability during charge and discharge cycling in the flat/bent state, and is promising for the application of portable and flexible devices. This work provides a new perspective for the fabrication of single-atom electrocatalysts with well-designed structure and excellent electrochemical energy conversion and storage capability.