کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1785524 1023383 2015 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
B, N-codoped 3D micro-/mesoporous carbon nanofibers web as efficient metal-free catalysts for oxygen reduction
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
B, N-codoped 3D micro-/mesoporous carbon nanofibers web as efficient metal-free catalysts for oxygen reduction
چکیده انگلیسی


• B, N-codoped 3D micro-mesoporous carbon nanofibers web was prepared.
• The electrospun fibers with void spaces facilitates the mass transport.
• The NH3 activation brings hierarchical structure, large SBET and more active sites.
• The B, N-codoped nanofibers web shows good ORR performance.
• The web can be also used in other energy and environment related fields.

B, N-codoped carbon nanofibers were massively prepared by heat treatment of electrospun carbon nanofibers with the mixture of boric acid/urea in N2 (BNCf-N) and subsequently activated in NH3 (BNCf-NA). The directly electrospun self-standing 3D non woven structure with void spaces between each fiber facilitates the mass transport of reactant and resulted molecules. Further NH3 activation gives BNCf-NA a high surface area of 306.3 m2 g−1 with micro/mesoporous structure, providing abundant passageway for proton transfer. Simultaneously, NH3 activation also realizes the optimization of surface functionalities, such as more B–N–C and pyridinic-N. These intriguing features render BNCf-NA excellent catalytic behavior with nearly four-electron oxygen reduction reaction (ORR) process in alkaline media, especially much better stability and methanol tolerance than the commercial Pt/C catalyst. Our work provides a large-scale preparation method for efficient metal-free catalysts toward ORR, thus further intensifying the commercial application of fuel cells.

Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Current Applied Physics - Volume 15, Issue 12, December 2015, Pages 1606–1614
نویسندگان
, , , , , , , , , ,