Wang Hao, Zheng Caixia, Huang Bing, Jiang Nannan, Li Yaoxin, Wang Minghao, Wu Qirui, Wang Huiying, Guan Lunhui
College of Chemistry, Fuzhou University, Fuzhou 350108, People's Republic of China.
CAS Key Laboratory of Design and Assembly of Functional Nanostructures, and Fujian Provincial Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, People's Republic of China.
Nanotechnology. 2023 Sep 13;34(48). doi: 10.1088/1361-6528/acf3f4.
Extensive investigations have been devoted to nitrogen-doped carbon materials as catalysts for the oxygen reduction reaction (ORR) in various conversion technologies. In this study, we introduce nitrogen-doped carbon materials with hollow spherical structures. These materials demonstrate significant potential in ORR activity within alkaline media, showing a half-wave potential of 0.87 V versus the reversible hydrogen electrode (RHE). Nitrogen-doped hollow carbon spheres (N-CHS) exhibit unique characteristics such as a thin carbon shell layer, hollow structure, large surface area, and distinct pore features. These features collectively create an optimal environment for facilitating the diffusion of reactants, thereby enhancing the exposure of active sites and improving catalytic performance. Building upon the promising qualities of N-CHS as a catalyst support, we employ heme chloride (1 wt%) as the source of iron for Fe doping. Through the carbonization process, Fe-N active sites are effectively formed, displaying a half-wave potential of 0.9 V versus RHE. Notably, when implemented as a cathode catalyst in zinc-air batteries, this catalyst exhibits an impressive power density of 162.6 mW cm.
在各种转化技术中，人们对氮掺杂碳材料作为氧还原反应（ORR）催化剂进行了广泛研究。在本研究中，我们引入了具有空心球形结构的氮掺杂碳材料。这些材料在碱性介质中展现出显著的ORR活性潜力，相对于可逆氢电极（RHE）的半波电位为0.87 V。氮掺杂空心碳球（N-CHS）具有诸如薄碳壳层、空心结构、大表面积和独特孔特征等独特特性。这些特性共同为促进反应物扩散创造了最佳环境，从而增加活性位点的暴露并提高催化性能。基于N-CHS作为催化剂载体的优良性质，我们使用氯化血红素（1 wt%）作为铁掺杂的铁源。通过碳化过程，有效地形成了Fe-N活性位点，相对于RHE的半波电位为0.9 V。值得注意的是，当作为锌空气电池的阴极催化剂使用时，这种催化剂展现出令人印象深刻的162.6 mW cm的功率密度。
