Sun Meiling, Yuan Fangying, Li Runqiu, Dong Shijun, Zhao Ye, Zhong Wenxia, Shen Chang, Wu Junpeng, Zheng Hui
Laboratory for Nanoelectronics and NanoDevices, Department of Electronics Science and Technology, Hangzhou Dianzi University, Hangzhou 310018, China.
ACS Omega. 2022 Jul 13;7(29):25458-25465. doi: 10.1021/acsomega.2c02395. eCollection 2022 Jul 26.
Preparation of a high-efficiency, low-cost, and environmentally friendly non-precious metal catalyst for the oxygen reduction reaction (ORR) is highly desirable in fuel cells. Herein, a Fe-FeC-functionalized few-layer graphene sheet (Fe/FeC/FLG) nanocomposite was fabricated through the vacuum heat treatment technique using ferric nitrate and glucose as the precursors and exhibited a high-performance ORR electrocatalyst. Multiple characterizations confirm that the nanosized Fe particles with the FeC interface are uniformly distributed in the FLGs. Electrocatalytic kinetics investigation of the nanocomposite indicates that the electron transfer process is a four-electron pathway. The formation of the FeC interface between the Fe nanoparticles and FLGs may promote the electron transfer from the Fe to FLGs. Furthermore, the Fe/FeC/FLG nanocomposite not only exhibits high ORR catalytic activity but also displays desirable stability. Consequently, the obtained Fe/FeC/FLG nanocomposite might be a promising non-precious, cheap, and high-efficiency catalyst for fuel cells.
在燃料电池中，制备一种用于氧还原反应（ORR）的高效、低成本且环境友好的非贵金属催化剂是非常有必要的。在此，通过真空热处理技术，以硝酸铁和葡萄糖为前驱体制备了一种Fe-FeC功能化的少层石墨烯片（Fe/FeC/FLG）纳米复合材料，其表现出高性能的ORR电催化剂。多种表征证实，具有FeC界面的纳米级Fe颗粒均匀分布在FLG中。对该纳米复合材料的电催化动力学研究表明，电子转移过程是一个四电子途径。Fe纳米颗粒与FLG之间FeC界面的形成可能促进电子从Fe转移到FLG。此外，Fe/FeC/FLG纳米复合材料不仅表现出高ORR催化活性，还具有良好的稳定性。因此，所获得的Fe/FeC/FLG纳米复合材料可能是一种有前景的用于燃料电池的非贵金属、廉价且高效的催化剂。
