利用化学浸渍还原法,以原始和混酸活化碳纳米管及聚苯胺改性制备的氮掺杂炭层包覆碳纳米管为载体,制备上述碳纳米管负载铂催化剂,研究比较它们作为质子交换膜燃料电池催化剂的电催化性能.透射电镜观察表明,以混酸活化碳纳米管为载体一定程度改善了铂粒子在碳管上的沉积形态和分散性,沉积的铂粒子大小约5~8 nm,但铂粒子仍存在较明显的团聚现象；而因聚苯胺改性碳纳米管外层为均匀氮掺杂炭层,铂粒子能均匀分散沉积于氮掺杂层表面,其平均粒径约为2~4 nm.电化学分析表明,混酸活化和氮掺杂炭层包覆碳纳米管都能够改善负载催化剂的电催化活性,尤其氮掺杂炭层包覆碳纳米管负载铂催化剂不仅具有最高氧还原活性,其负载催化剂同时展现了良好的循环稳定性.
Electrocatalysts of pristine carbon nanotubes (CNTs),activated CNTs from the mixed acid oxidation and nitrogen-doped carbon layer coated CNTs (NCNTs)from modification of polyaniline (PANI),loading with platinum,were prepared by using chemical reduction of immersion.The electrocatalytical performance of these platinum loaded CNTs as the catalysts of proton exchange membrane fuel cell (PEMFC)was studied.The TEM observation showed that the morphology and distribution of platinum particles onto the CNTs could be im-proved by using the activated CNTs as supports of catalyst.Particle size of platinum distributed on the activated CNTs was about 4-8 nm,but the obvious agglomeration could be observed.For the NCNTs from the modifica-tion of PANI,platinum particles with size of 2-4 nm were uniformly distributed on the NCNTs surface owing to the uniform nitrogen doped layer coated on the CNTs.Electrochemical analyses showed that both the activation and nitrogen doping on the CNTs could improve the activity of catalysts supported on CNTs,especially that platinum loaded NCNTs not only possess the best activity of oxygen reduction but also exhibited a good cycling stability.
参考文献
| [1] | Zhang Weimin;Peter S;Andrew M et al.Carbon nano-tube architectures as catalyst supports for proton ex-change membrane fuel cells[J].Energy Environmental Science,2010,3:1286-1293. |
| [2] | 陈煜,唐亚文,周益民,刘长鹏,邢巍,陆天虹.碳纳米管作燃料电池催化剂载体的研究进展[J].电池,2006(01):71-73. |
| [3] | Wang Xin;Li Wenzhen;Chen Zhongwei et al.Durability investigation of carbon nanotube as catalyst support for proton exchange membrane fuel cell[J].Journal of Power Sources,2006,158:154-159. |
| [4] | 朱红,葛奉娟,康晓红,杨玉国,许韵华.质子交换膜燃料电池用碳纳米管载铂催化剂的研究[J].电化学,2003(04):445-450. |
| [5] | Peng-Xiang Hou;Chang Liu;Hui-Ming Cheng .Purification of carbon nanotubes[J].Carbon: An International Journal Sponsored by the American Carbon Society,2008(15):2003-2025. |
| [6] | 纪美茹;傅小奇;丁海辉 .多壁纳米碳管的制备与表面改性处理[J].功能材料,2011,42:901-904. |
| [7] | Wenzhong Shen;Weibin Fan .Nitrogen-containing porous carbons: synthesis and application[J].Journal of Materials Chemistry, A. Materials for energy and sustainability,2013(4):999-1013. |
| [8] | 李莉香,陶晶,耿新,安百钢.聚苯胺改性氮掺杂碳纳米管制备及其超级电容器性能[J].物理化学学报,2013(01):111-116. |
| [9] | 李莉香,李峰.羰基、羧基和羟基表面官能团对碳纳米管电容量的影响[J].新型炭材料,2011(03):224-228. |
| [10] | Wei An;C. Heath Turner .Chemisorption of Transition-Metal Atoms on Boron- and Nitrogen-Doped Carbon Nanotubes: Energetics and Geometric and Electronic Structures[J].The journal of physical chemistry, C. Nanomaterials and interfaces,2009(17):7069-7078. |
| [11] | Tang, YF;Allen, BL;Kauffman, DR;Star, A .Electrocatalytic Activity of Nitrogen-Doped Carbon Nanotube Cups[J].Journal of the American Chemical Society,2009(37):13200-13201. |
| [12] | Xenia Tuaev;Rene Illgen .Nitrogen-doped coatings on carbon nanotubes and their stabilizing effect on Pt nanoparticles[J].Physical chemistry chemical physics: PCCP,2012(18):6444-6447. |
| [13] | Chen, YG;Wang, JJ;Liu, H;Li, RY;Sun, XL;Ye, SY;Knights, S .Enhanced stability of Pt electrocatalysts by nitrogen doping in CNTs for PEM fuel cells[J].Electrochemistry communications,2009(10):2071-2076. |
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