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Nitrogen-doped activated carbon with micrometer-scale channels derived from luffa sponge fibers as electrocatalysts for oxygen reduction reaction with high stability in acidic media
被引:61
作者:

Li, Jianpeng
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Harbin Inst Technol, Shenzhen Engn Lab Flexible Transparent Conduct Fi, Dept Mat Sci & Engn, Shenzhen Key Lab Adv Mat,Shenzen Grad Sch, Shenzhen 518055, Peoples R China Harbin Inst Technol, Shenzhen Engn Lab Flexible Transparent Conduct Fi, Dept Mat Sci & Engn, Shenzhen Key Lab Adv Mat,Shenzen Grad Sch, Shenzhen 518055, Peoples R China

Wang, Shuguang
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Harbin Inst Technol, Shenzhen Engn Lab Flexible Transparent Conduct Fi, Dept Mat Sci & Engn, Shenzhen Key Lab Adv Mat,Shenzen Grad Sch, Shenzhen 518055, Peoples R China Harbin Inst Technol, Shenzhen Engn Lab Flexible Transparent Conduct Fi, Dept Mat Sci & Engn, Shenzhen Key Lab Adv Mat,Shenzen Grad Sch, Shenzhen 518055, Peoples R China

Ren, Yaqi
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Harbin Inst Technol, Shenzhen Engn Lab Flexible Transparent Conduct Fi, Dept Mat Sci & Engn, Shenzhen Key Lab Adv Mat,Shenzen Grad Sch, Shenzhen 518055, Peoples R China Harbin Inst Technol, Shenzhen Engn Lab Flexible Transparent Conduct Fi, Dept Mat Sci & Engn, Shenzhen Key Lab Adv Mat,Shenzen Grad Sch, Shenzhen 518055, Peoples R China

Ren, Zhonghua
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Harbin Inst Technol, Shenzhen Engn Lab Flexible Transparent Conduct Fi, Dept Mat Sci & Engn, Shenzhen Key Lab Adv Mat,Shenzen Grad Sch, Shenzhen 518055, Peoples R China Harbin Inst Technol, Shenzhen Engn Lab Flexible Transparent Conduct Fi, Dept Mat Sci & Engn, Shenzhen Key Lab Adv Mat,Shenzen Grad Sch, Shenzhen 518055, Peoples R China

Qiu, Yejun
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Harbin Inst Technol, Shenzhen Engn Lab Flexible Transparent Conduct Fi, Dept Mat Sci & Engn, Shenzhen Key Lab Adv Mat,Shenzen Grad Sch, Shenzhen 518055, Peoples R China Harbin Inst Technol, Shenzhen Engn Lab Flexible Transparent Conduct Fi, Dept Mat Sci & Engn, Shenzhen Key Lab Adv Mat,Shenzen Grad Sch, Shenzhen 518055, Peoples R China

Yu, Jie
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Harbin Inst Technol, Shenzhen Engn Lab Flexible Transparent Conduct Fi, Dept Mat Sci & Engn, Shenzhen Key Lab Adv Mat,Shenzen Grad Sch, Shenzhen 518055, Peoples R China Harbin Inst Technol, Shenzhen Engn Lab Flexible Transparent Conduct Fi, Dept Mat Sci & Engn, Shenzhen Key Lab Adv Mat,Shenzen Grad Sch, Shenzhen 518055, Peoples R China
机构:
[1] Harbin Inst Technol, Shenzhen Engn Lab Flexible Transparent Conduct Fi, Dept Mat Sci & Engn, Shenzhen Key Lab Adv Mat,Shenzen Grad Sch, Shenzhen 518055, Peoples R China
基金:
中国国家自然科学基金;
关键词:
activated carbon;
luffa sponge fibers;
oxygen reduction reaction;
electrocatalysts;
acidic media;
ORDERED MESOPOROUS CARBONS;
GRAPHENE;
NANOFIBERS;
ARRAYS;
ENHANCEMENT;
PRECURSORS;
CHEMISTRY;
CATALYSTS;
PLATINUM;
ALKALINE;
D O I:
10.1016/j.electacta.2014.10.089
中图分类号:
O646 [电化学、电解、磁化学];
学科分类号:
081704 ;
摘要:
Nitrogen-doped multichanneled activated carbon (NMAC) has been prepared for application as electrocatalysts for oxygen reduction reaction (ORR) in fuel cells. The NMAC is prepared by carbonizing luffa sponge fibers in NH3 and subsequent activation with KOH. The NMAC possesses densely packed and parallel channels with diameters of 3-13 mu m and wall thickness of 0.4-1.8 mu m. After activation micro- and mesopores are generated on the channel walls, forming a hierarchically porous structure. The NMAC exhibits excellent electrocatalytic performance for ORR both in alkaline and acidic media with high electrocatalytic activity and long-term operation stability. In particular, the NMAC has prominent stability in acidic media, keeping stable after about 7 hours and retaining 88.5% of the initial current density after 12 hours in 0.5 M H2SO4 solution. Because the active sites are located on the inner surface of the micrometer-scale channels the performance degradation caused by peeling, aggregation, and crack during operation can be avoided, resulting the high stability. Considering the abundance of luffa fibers on earth, the present NMAC materials are highly promising in various applications such as electrocatalysts, supercapacitors, and templates for supporting various functional materials. (C) 2014 Elsevier Ltd. All rights reserved.
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页码:56 / 64
页数:9
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