Chen Yuanzhen, Dong Shujuan, Li Sai, Liu Yongning, Yan Wei
J Nanosci Nanotechnol. 2015 May;15(5):3862-9. doi: 10.1166/jnn.2015.9541.
N-doped hollow carbon nanospheres (HCNSs) were prepared by electric arc discharge method in N2 atmosphere. X-ray Photoelectron Spectroscopy (XPS) analysis shows that their nitrogen content reaches up to 4.9 atom%. Both the low thermal conductivity of N2 and the doping of nitrogen atom make carbon unit bend to form hollow nanosphere structure. High-resolution transmission electron microscopy (HRTEM) and X-ray diffusion (XRD) analysis prove the presence of detected defects and a poor crystallinity on the HCNSs shell. Moreover, annealing treatment of HCNSs was carried out at 1100 degrees C/10 h and 1400 degrees C/2 h to research their fracture extension. It is found that HCNSs could grow into closed-tubes even with a shell at high annealing temperature. HCNSs were applied in direct borohydride fuel cell (DBFC) to evaluate their catalytic performance. The electrochemical results show that pure HCNSs doesn't have any catalysis effect, but they can greatly promote the catalytic performance of CoO, and the largest polarization current density of which achieves 1.845 A x cm(-2) at -0.7 V (vs. Hg/HgO electrode).
通过在氮气气氛中采用电弧放电法制备了氮掺杂空心碳纳米球（HCNSs）。X射线光电子能谱（XPS）分析表明，它们的氮含量高达4.9原子%。氮气的低热导率以及氮原子的掺杂使得碳单元弯曲形成空心纳米球结构。高分辨率透射电子显微镜（HRTEM）和X射线衍射（XRD）分析证明了在HCNSs壳层上存在检测到的缺陷以及较差的结晶度。此外，对HCNSs进行了1100℃/10小时和1400℃/2小时的退火处理以研究它们的断裂扩展情况。结果发现，即使在高退火温度下带有壳层，HCNSs也能生长成封闭管。将HCNSs应用于直接硼氢化物燃料电池（DBFC）以评估其催化性能。电化学结果表明，纯HCNSs没有任何催化作用，但它们能极大地促进CoO的催化性能，其最大极化电流密度在-0.7V（相对于Hg/HgO电极）时达到1.845A×cm⁻²。
