Journal ArticleDOI
Active sites of nitrogen-doped carbon materials for oxygen reduction reaction clarified using model catalysts
Reads0
Chats0
TLDR
In this paper, the oxygen reduction reaction (ORR) active site was characterized by using newly designed graphite (highly oriented pyrolitic graphite) model catalysts with well-defined π conjugation and well-controlled doping of N species.Abstract:
Nitrogen (N)-doped carbon materials exhibit high electrocatalytic activity for the oxygen reduction reaction (ORR), which is essential for several renewable energy systems. However, the ORR active site (or sites) is unclear, which retards further developments of high-performance catalysts. Here, we characterized the ORR active site by using newly designed graphite (highly oriented pyrolitic graphite) model catalysts with well-defined π conjugation and well-controlled doping of N species. The ORR active site is created by pyridinic N. Carbon dioxide adsorption experiments indicated that pyridinic N also creates Lewis basic sites. The specific activities per pyridinic N in the HOPG model catalysts are comparable with those of N-doped graphene powder catalysts. Thus, the ORR active sites in N-doped carbon materials are carbon atoms with Lewis basicity next to pyridinic N.read more
Citations
More filters
Journal ArticleDOI
Recent Advances in Ultrathin Two-Dimensional Nanomaterials
Chaoliang Tan,Xiehong Cao,Xiehong Cao,Xue-Jun Wu,Qiyuan He,Jian Yang,Xiao Zhang,Junze Chen,Wei Zhao,Shikui Han,Gwang-Hyeon Nam,Melinda Sindoro,Hua Zhang +12 more
TL;DR: The unique advances on ultrathin 2D nanomaterials are introduced, followed by the description of their composition and crystal structures, and the assortments of their synthetic methods are summarized.
Journal ArticleDOI
Cocatalysts for Selective Photoreduction of CO2 into Solar Fuels.
TL;DR: Various cocatalysts, such as the biomimetic, metal-based,Metal-free, and multifunctional ones, and their selectivity for CO2 photoreduction are summarized and discussed, along with the recent advances in this area.
Journal ArticleDOI
Emerging Two-Dimensional Nanomaterials for Electrocatalysis
Huanyu Jin,Chunxian Guo,Xin Liu,Jinlong Liu,Anthony Vasileff,Yan Jiao,Yao Zheng,Shi-Zhang Qiao +7 more
TL;DR: The fundamental relationships between electronic structure, adsorption energy, and apparent activity for a wide variety of 2D electrocatalysts are described with the goal of providing a better understanding of these emerging nanomaterials at the atomic level.
Journal ArticleDOI
General synthesis and definitive structural identification of MN4C4 single-atom catalysts with tunable electrocatalytic activities
Huilong Fei,Juncai Dong,Yexin Feng,Christopher S. Allen,Chengzhang Wan,Boris Volosskiy,Mufan Li,Zipeng Zhao,Yiliu Wang,Hongtao Sun,Pengfei An,Wenxing Chen,Zhiying Guo,Chain Lee,Dongliang Chen,Imran Shakir,Mingjie Liu,Tiandou Hu,Yadong Li,Angus I. Kirkland,Xiangfeng Duan,Yu Huang +21 more
TL;DR: In this paper, a general approach to a series of monodispersed atomic transition metals (for example, Fe, Co, Ni) embedded in nitrogen-doped graphene with a common MN4C4 moiety, identified by systematic X-ray absorption fine structure analyses and direct transmission electron microscopy imaging, was reported.
Journal ArticleDOI
State of the Art and Prospects in Metal-Organic Framework (MOF)-Based and MOF-Derived Nanocatalysis.
Qi Wang,Didier Astruc +1 more
TL;DR: This review first briefly summarizes this background of MOF nanoparticle catalysis and then comprehensively reviews the fast-growing literature reported during the last years.
References
More filters
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
Nitrogen-Doped Graphene as Efficient Metal-Free Electrocatalyst for Oxygen Reduction in Fuel Cells
TL;DR: The resultant N-graphene was demonstrated to 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 via a four-electron pathway in alkaline fuel cells.
Journal ArticleDOI
Exploration of the active center structure of nitrogen-doped graphene-based catalysts for oxygen reduction reaction
Linfei Lai,Linfei Lai,Linfei Lai,Jeffrey R. Potts,Da Zhan,Liang Wang,Chee Kok Poh,Chunhua Tang,Hao Gong,Zexiang Shen,Jianyi Lin,Rodney S. Ruoff +11 more
TL;DR: In this article, two different ways to fabricate nitrogen-doped graphene (N-graphene) and demonstrate its use as a metal-free catalyst to study the catalytic active center for the oxygen reduction reaction (ORR).
Journal ArticleDOI
Metal-free catalysts for oxygen reduction reaction.
TL;DR: This paper presents a probabilistic procedure for estimating the polymethine content of carbon dioxide using a straightforward two-step procedure, and shows good results in both the stationary and the liquid phase.
Journal ArticleDOI
Evolution of nitrogen functionalities in carbonaceous materials during pyrolysis
TL;DR: In this paper, X-ray photoelectron spectroscopy (XPS) was used to investigate the fate of nitrogen functional forms present in a lignite and its chars, derived from the model compounds acridine, carbazole and polyacrylonitrile (PAN).