Journal ArticleDOI
Understanding the High Activity of Fe-N-C Electrocatalysts in Oxygen Reduction: Fe/Fe3C Nanoparticles Boost the Activity of Fe-N(x).
Wen-Jie Jiang,Lin Gu,Li Li,Yun Zhang,Yun Zhang,Xing Zhang,Linjuan Zhang,Jianqiang Wang,Jin-Song Hu,Zidong Wei,Li-Jun Wan +10 more
TLDR
A new highly active Fe-n-C ORR catalyst containing Fe-N(x) coordination sites and Fe/Fe3C nanocrystals (Fe@C-FeNC) is developed, and the origin of its activity is revealed by intensively investigating the composition and the structure of the catalyst and their correlations with the electrochemical performance.Abstract:
Understanding the origin of high activity of Fe–N–C electrocatalysts in oxygen reduction reaction (ORR) is critical but still challenging for developing efficient sustainable nonprecious metal catalysts in fuel cells and metal–air batteries. Herein, we developed a new highly active Fe–N–C ORR catalyst containing Fe–Nx coordination sites and Fe/Fe3C nanocrystals (Fe@C-FeNC), and revealed the origin of its activity by intensively investigating the composition and the structure of the catalyst and their correlations with the electrochemical performance. The detailed analyses unambiguously confirmed the coexistence of Fe/Fe3C nanocrystals and Fe–Nx in the best catalyst. A series of designed experiments disclosed that (1) N-doped carbon substrate, Fe/Fe3C nanocrystals or Fe–Nx themselves did not deliver the high activity; (2) the catalysts with both Fe/Fe3C nanocrystals and Fe–Nx exhibited the high activity; (3) the higher content of Fe–Nx gave the higher activity; (4) the removal of Fe/Fe3C nanocrystals sever...read more
Citations
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Journal ArticleDOI
Metal Catalysts for Heterogeneous Catalysis: From Single Atoms to Nanoclusters and Nanoparticles.
Lichen Liu,Avelino Corma +1 more
TL;DR: This Review will compare the results obtained from different systems and try to give a picture on how different types of metal species work in different reactions and give perspectives on the future directions toward better understanding of the catalytic behavior of different metal entities in a unifying manner.
Journal ArticleDOI
Isolated Single Iron Atoms Anchored on N-Doped Porous Carbon as an Efficient Electrocatalyst for the Oxygen Reduction Reaction
Yuanjun Chen,Shufang Ji,Yang-Gang Wang,Juncai Dong,Wenxing Chen,Zhi Li,Rongan Shen,Lirong Zheng,Zhongbin Zhuang,Dingsheng Wang,Yadong Li +10 more
TL;DR: Experiments demonstrated that maintaining the Fe as isolated atoms and incorporating nitrogen was essential to deliver the high performance, and the high reactivity to the high efficiency of the single Fe atoms in transporting electrons to the adsorbed OH species.
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
Single Atomic Iron Catalysts for Oxygen Reduction in Acidic Media: Particle Size Control and Thermal Activation.
Hanguang Zhang,Sooyeon Hwang,Maoyu Wang,Zhenxing Feng,Stavros Karakalos,Langli Luo,Zhi Qiao,Xiaohong Xie,Chongmin Wang,Dong Su,Yuyan Shao,Gang Wu +11 more
TL;DR: A high-performance atomic Fe catalyst derived from chemically Fe-doped zeolitic imidazolate frameworks (ZIFs) by directly bonding Fe ions to imidAZolate ligands within 3D frameworks holds great promise as a replacement for Pt in future PEMFCs.
Journal ArticleDOI
Molecule-Level g-C3N4 Coordinated Transition Metals as a New Class of Electrocatalysts for Oxygen Electrode Reactions
Yao Zheng,Yan Jiao,Yihan Zhu,Qiran Cai,Anthony Vasileff,Lu Hua Li,Yu Han,Ying Chen,Shi-Zhang Qiao +8 more
TL;DR: The correlation of experimental and computational results confirms that this high activity originates from the precise M-N2 coordination in the g-C3N4 matrix, and the reversible ORR/OER activity trend has been constructed to provide guidance for the molecular design of this promising class of catalysts.
References
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Journal ArticleDOI
Materials for fuel-cell technologies
TL;DR: Recent progress in the search and development of innovative alternative materials in the development of fuel-cell stack is summarized.
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
Co3O4 nanocrystals on graphene as a synergistic catalyst for oxygen reduction reaction
TL;DR: The Co₃O₄/N-doped graphene hybrid exhibits similar catalytic activity but superior stability to Pt in alkaline solutions, making it a high-performance non-precious metal-based bi-catalyst for both ORR and OER.
Journal ArticleDOI
Electrocatalyst approaches and challenges for automotive fuel cells
TL;DR: Taking the step towards successful commercialization requires oxygen reduction electrocatalysts that meet exacting performance targets, and these catalyst systems will need to be highly durable, fault-tolerant and amenable to high-volume production with high yields and exceptional quality.
Journal ArticleDOI
Improved Oxygen Reduction Activity on Pt3Ni(111) via Increased Surface Site Availability
Vojislav R. Stamenkovic,Vojislav R. Stamenkovic,Ben Fowler,Bongjin Simon Mun,Guofeng Wang,Philip N. Ross,Chris Lucas,Nenad M. Markovic +7 more
TL;DR: It is demonstrated that the Pt3Ni( 111) surface is 10-fold more active for the ORR than the corresponding Pt(111) surface and 90-foldMore active than the current state-of-the-art Pt/C catalysts for PEMFC.