Journal ArticleDOI
Monodisperse cobalt sulfides embedded within nitrogen-doped carbon nanoflakes: an efficient and stable electrocatalyst for the oxygen reduction reaction
TLDR
In this paper, the authors reported the designed synthesis of Co9S8 and nitrogen doped hollow carbon sphere composites by carbonization of metanilic anions within the confinement of two-dimensional galleries of hollow spherical cobalt-aluminum layered double hydroxides.Abstract:
Unique hollow hybrid structures composed of well-dispersed catalyst nanoparticles embedded in a carbon matrix offer great advantages for constructing advanced supported catalysts. Herein, we report the designed synthesis of Co9S8 and nitrogen doped hollow carbon sphere (Co9S8/NHCS) composites by carbonization of metanilic anions within the confinement of two-dimensional galleries of hollow spherical cobalt–aluminum layered double hydroxides. The Co9S8/NHCS composites are composed of numerous porous carbon nanoflakes, and monodisperse Co9S8 nanoparticles are embedded within the carbon nanoflakes. Electrochemical measurements show that the Co9S8/NHCS catalysts prepared at 900 °C exhibit superior oxygen reduction reaction (ORR) activity, resulting in the highest ORR performance to date among all transition metal sulfide-based ORR catalysts in both alkaline and acidic electrolytes. This interlayer confined reaction approach may provide an efficient platform for the synthesis of other functional materials for alternative applications.read more
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Journal ArticleDOI
Cobalt-gluconate-derived high-density cobalt sulfides nanocrystals encapsulated within nitrogen and sulfur dual-doped micro/mesoporous carbon spheres for efficient electrocatalysis of oxygen reduction
Haitao Wang,Xiaoyu Qiu,Zhuo Peng,Wei Wang,Junlei Wang,Tiansui Zhang,Lipei Jiang,Hongfang Liu +7 more
TL;DR: A cobalt-gluconate-derived nitrogen and sulfur dual-doped micro/mesoporous carbon sphere with encapsulated high-density cobalt sulfide nanocrystals is developed by annealing and subsequent high-temperature vulcanization, demonstrating superior ORR catalytic activity and durability compared to platinum/carbon (Pt/C) catalyst.
Journal ArticleDOI
Cobalt Nanoparticles Embedded in N-Doped Carbon Nanotubes on Reduced Graphene Oxide as Efficient Oxygen Catalysts for Zn-Air Batteries
Xiaomin Peng,Licheng Wei,Yiyi Liu,Tianlun Cen,Zhifeng Ye,Zhaogen Zhu,Zhaotong Ni,Dingsheng Yuan +7 more
TL;DR: The key point to developing green and environmentally friendly zinc-air batteries is exploring efficient bifunctional electrocatalysts for oxygen reduction and evolution reactions (ORR and OER) on as mentioned in this paper.
Journal ArticleDOI
Cobalt sulfides nanoparticles encapsulated in N, S co-doped carbon substrate for highly efficient oxygen reduction
Xiaoyu Qiu,Yang Yu,Zhuo Peng,Muhammad Asif,Zhengyun Wang,Lipei Jiang,Wei Wang,Zhenkai Xu,Haitao Wang,Hongfang Liu +9 more
TL;DR: In this paper, a template-free approach is proposed to design CoSx (Co1-xS and Co9S8) nanoparticles encapsulated in N, S-doped carbon substrate (CoSx/NSCS).
Journal ArticleDOI
Cobalt sulfides constructed heterogeneous interfaces decorated on N,S-codoped carbon nanosheets as a highly efficient bifunctional oxygen electrocatalyst
Changbin Sun,Jia Ding,Haozhi Wang,Jie Liu,Xiaopeng Han,Yida Deng,Cheng Zhong,Cheng Zhong,Wenbin Hu,Wenbin Hu +9 more
TL;DR: In this article, a nitrogen/sulfur-codoped carbon nanosheets (NSC) was constructed with dense Co9S8/Co1−xS heterostructures, which can effectively optimize the adsorption/desorption behaviors of intermediates in ORR/OER, thus promoting the bifunctional electrocatalytic performance.
Journal ArticleDOI
Fe/Co-based nanoparticles encapsulated in heteroatom-doped carbon electrocatalysts for oxygen reduction reaction
TL;DR: In this article, a review of carbon encapsulated Fe/Co-based nanoparticles catalysts for oxygen reduction reaction (ORR) is presented, and these catalysts are summarized in categories of metals, oxides, carbides, phosphides, sulfides and hybrid nanoparticles.
References
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Journal ArticleDOI
Nitrogen-doped carbon nanotube arrays with high electrocatalytic activity for oxygen reduction.
TL;DR: It is reported that vertically aligned nitrogen-containing carbon nanotubes (VA-NCNTs) can act as a metal-free electrode with a much better electrocatalytic activity, long-term operation stability, and tolerance to crossover effect than platinum for oxygen reduction in alkaline fuel cells.
Journal ArticleDOI
High-Performance Electrocatalysts for Oxygen Reduction Derived from Polyaniline, Iron, and Cobalt
TL;DR: A family of non–precious metal catalysts that approach the performance of platinum-based systems at a cost sustainable for high-power fuel cell applications, possibly including automotive power.
Journal Article
High-Performance Electrocatalysts for Oxygen Reduction Derived from Polyaniline, Iron, and Cobalt
TL;DR: In this article, a family of non-precious metal catalysts that approach the performance of platinum-based systems at a cost sustainable for high-power fuel cell applications, possibly including automotive power.
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An oxygen reduction electrocatalyst based on carbon nanotube–graphene complexes
Yanguang Li,Wu Zhou,Wu Zhou,Hailiang Wang,Liming Xie,Yongye Liang,Fei Wei,Juan Carlos Idrobo,Juan Carlos Idrobo,Stephen J. Pennycook,Stephen J. Pennycook,Hongjie Dai +11 more
TL;DR: It is shown that few-walled carbon nanotubes, following outer wall exfoliation via oxidation and high-temperature reaction with ammonia, can act as an oxygen reduction reaction electrocatalyst in both acidic and alkaline solutions.
Journal ArticleDOI
Heteroatom-doped graphene materials: syntheses, properties and applications
TL;DR: The distinct properties resulting from various dopants, different doping levels and configurations, and synergistic effects from co-dopants are emphasized, hoping to assist a better understanding of doped graphene materials.