摘要
The technical bottleneck of carbon materials as counter electrodes(CEs)lies in their limited electrical conduc-tivity,extended ion diffusion paths,poor dispersion,and high contact resistance.Problem-oriented in-situ self-grown N-doped CNTs-coated Ni nanoparticles based on N-doped carbonaceous structures derived from pitaya peel(PC)are adopted to construct Ni-N-C hybrid 3D ionized network sites(Ni@NCNTs/PC-4)as CEs.Structural characterization,micromorphological and chemical composition analyses revealed the 3D network structure of Ni@NCNTs/PC-4 with abundant active sites.They effectively shorten the diffusion distance of I 3−ions with a smaller charge transfer resistance(5.21Ω)than that of PC(12.53Ω).DSSCs based on Ni@NCNTs/PC-4 display good optoelectronic properties,in which the short-circuit current density(Jsc)is 13.27 mA/cm^(2),higher than those of Pt(11.66 mA/cm^(2))and PC(6.99 mA/cm^(2)).The PCE value(5.13%)of DSSCs based on Ni@NCNTs/PC-4 is also higher than that of DSSCs based on PC(2.47%).Overall,this work provides a preliminary research and new ideas for further in-depth study of biomass-derived 3D structured-carbons that contribute to key electrodes in DSSCs.
基金
supported by the National Natural Science Foundation of China(31960293).
作者简介
Corresponding author at:Dongying Hu,Dongying Hu School of Resources,Environment and Materials,Guangxi University,Nanning,530004,China.E-mail address:.hdygxu@163.com。
