کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6454005 1418803 2017 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
3D Co-N-doped hollow carbon spheres as excellent bifunctional electrocatalysts for oxygen reduction reaction and oxygen evolution reaction
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
3D Co-N-doped hollow carbon spheres as excellent bifunctional electrocatalysts for oxygen reduction reaction and oxygen evolution reaction
چکیده انگلیسی


- Straightforward synthesis of new Co-N-doped carbon-based (Co-N@HCS) hollow nanospherical structures.
- Co-N@HCS exhibits high OER and ORR electrocatalytic performance methanol tolerance and stability.
- Excellent properties of Co-N@HCS are attributed to high surface area and 3D hollow architecture.

Non-precious materials have been considered as promising bifunctional catalysts towards oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). In the present work, a three dimensional (3D) Co-N co-doped hollow carbon sphere (HCS) electrocatalyst is synthesized at room temperature by the aid of a facile preparation method.The as obtained Co-N co-doped catalyst exhibits excellent catalytic activity towards both ORR and OER due to its high surface area and to 3D hollow architecture. For the ORR, the catalyst shows more positive onset-potential (of ∼0.962 V vs. RHE) and larger diffusion limiting current density (5.55 mA cm−2) compared with benchmark Pt/C catalyst in alkaline medium. Moreover, the as synthesized catalyst exhibits low potential (1.720 V vs. RHE) at the current density of 10 mA cm−2 and small Tafel slope (81 mV dec−1) for OER. In addition, the catalyst exhibits remarkable methanol tolerance and good long-term stability under working conditions. This strategy provides a facile and effective method for the preparation of non-noble metal catalysts with 3D hollow structure for energy conversion and storage applications.

Straightforward synthesized Co-N-doped carbon-based hollow nanospheres exhibit high performance for both OER and ORR due to their high surface area and 3D hollow architecture.252

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Catalysis B: Environmental - Volume 217, 15 November 2017, Pages 477-484
نویسندگان
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