塔菲尔方程
材料科学
纳米材料
金属有机骨架
纳米技术
碳纤维
化学工程
合理设计
限制电流
制作
金属
热解
电化学
化学
复合数
电极
物理化学
复合材料
冶金
医学
替代医学
吸附
病理
工程类
作者
Lujiao Mao,Yongjie Ge,Dandan Chen,Yuandong Yang,Shaojie Xu,Jinhang Xue,Kuikui Xiao,Xuemei Zhou,Jinjie Qian,Zhi Yang
标识
DOI:10.1007/s40843-022-2374-3
摘要
The rational design and facile fabrication of cost-effective, efficient, and robust non-precious metal-based carbon nanomaterials are of great significance. Herein, under the control of temperature, the single-crystal-to-single-crystal transformation from MOF-5 to ZIF-8 via ligand exchange can be easily achieved with the intermediate and final structures of ZIF-8-M and ZIF-8-F, respectively. After pyrolysis of Fe-doped MOF (metal-organic framework) materials, Fe-ZIF-8-F-900 was obtained and featured large surface area, high degree of graphitization, a large number of carbon nanotubes, and highly active Fe species. All of these characteristics contribute to fast electron transfer and mass transport, resulting in a satisfactory oxygen reduction performance which is comparable to that of Pt/C, such as superior onset potential (0.982 V), limiting diffusion current density (5.41 mA cm−2), small Tafel slope (40.6 mV dec−1), and high current retention of 94.4% after 10 h. Furthermore, the experimental and simulation results both verify that the assembled zinc-air batteries possess excellent properties in practical applications. This study provides a rational design strategy for the development and preparation of high-efficiency and low-cost non-precious metal-based electrocatalysts, which further indicates new directions for energy-related practical applications.
科研通智能强力驱动
Strongly Powered by AbleSci AI