Journal ArticleDOI
Microporous Framework Induced Synthesis of Single-Atom Dispersed Fe-N-C Acidic ORR Catalyst and Its in Situ Reduced Fe-N4 Active Site Identification Revealed by X-ray Absorption Spectroscopy
Meiling Xiao,Jianbing Zhu,Liang Ma,Zhao Jin,Junjie Ge,Xin Deng,Yang Hou,Qinggang He,Jingkun Li,Qingying Jia,Sanjeev Mukerjee,Ruoou Yang,Zheng Jiang,Dang Sheng Su,Changpeng Liu,Wei Xing +15 more
Reads0
Chats0
TLDR
In this paper, a microporous metal-organic-framework-confined strategy toward the preferable formation of single-atom dispersed catalysts is presented, where a high-spin Fe3+-N4 configuration is revealed by the 57Fe Mossbauer spectrum and X-ray absorption spectroscopy for Fe L-edge.Abstract:
Developing highly efficient, low-cost oxygen reduction catalysts, especially in acidic medium, is of significance toward fuel cell commercialization. Although pyrolyzed Fe-N-C catalysts have been regarded as alternatives to platinum-based catalytic materials, further improvement requires precise control of the Fe-Nx structure at the molecular level and a comprehensive understanding of catalytic site structure and the ORR mechanism on these materials. In this report, we present a microporous metal–organic-framework-confined strategy toward the preferable formation of single-atom dispersed catalysts. The onset potential for Fe-N-C is 0.92 V, comparable to that of Pt/C and outperforming most noble-metal-free catalysts ever reported. A high-spin Fe3+-N4 configuration is revealed by the 57Fe Mossbauer spectrum and X-ray absorption spectroscopy for Fe L-edge, which will convert to Fe2+-N4 at low potential. The in situ reduced Fe2+-N4 moiety from high-spin Ox-Fe3+-N4 contributes to most of the ORR activity due t...read more
Citations
More filters
Journal ArticleDOI
MOF-derived electrocatalysts for oxygen reduction, oxygen evolution and hydrogen evolution reactions
TL;DR: A wide range of applications based on these materials for ORR, OER, HER and multifunctional electrocatalysis are discussed, with an emphasis on the required features of MOF-derived carbon-based materials for the Electrocatalysis of corresponding reactions.
Journal ArticleDOI
Well-Defined Materials for Heterogeneous Catalysis: From Nanoparticles to Isolated Single-Atom Sites.
TL;DR: The roles of nanoparticles and isolated single atom sites in catalytic reactions are surveyed and the challenges and opportunities of well-defined materials for catalyst development are highlighted, gaining a fundamental understanding of their active sites.
Journal ArticleDOI
Modulating the local coordination environment of single-atom catalysts for enhanced catalytic performance
TL;DR: In this article, the characterization of the coordination environment, tailoring of the local coordination environment and their related adjustable catalytic performance are discussed. But the focus of this paper is on single-atom catalysts.
Journal ArticleDOI
Atomic Fe Dispersed on N-Doped Carbon Hollow Nanospheres for High-Efficiency Electrocatalytic Oxygen Reduction
TL;DR: This present synthetic strategy is elaborately designed to synthesize atomically dispersed Fe atoms anchored on N-doped carbon nanospheres (denoted as Fe-N-C HNSs) using the cheap and sustainable biomaterial of histidine (His) as the N and C precursor.
Journal ArticleDOI
Advanced Electrocatalysts with Single-Metal-Atom Active Sites.
Yuxuan Wang,Hongyang Su,Yanghua He,Ligui Li,Shangqian Zhu,Hao Shen,Pengfei Xie,Xianbiao Fu,Guangye Zhou,Chen Feng,Dengke Zhao,Fei Xiao,Xiaojing Zhu,Yachao Zeng,Minhua Shao,Shaowei Chen,Gang Wu,Jie Zeng,Chao Wang +18 more
TL;DR: This review aims to provide a comprehensive summary on the recent development of single-atom electrocatalysts for various energy-conversion reactions using state-of-the-art microscopic and spectroscopic techniques.
References
More filters
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
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
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.