PatentDOI
Metal-free bifunctional electrocatalyst for oxygen reduction and oxygen evolution reactions
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A mesoporous carbon foam co-doped with nitrogen and phosphorus that has a large surface area and good electrocatalytic properties for both ORR and OER and is tested as an air electrode for primary and rechargeable Zn-air batteries.Abstract:
A co-doped carbon material, methods of making such materials, and electrochemical cells and devices comprising such materials are provided. The co-doped carbon material comprises a mesoporous carbon material doped with nitrogen and phoshporous (NPMC). The present NPMC exhibit catalytic activity for both oxygen reduction reaction and oxygen evolution reaction and may be useful as an electrode in an electrochemical cell and particularly as part of a battery. The present NPMC materials may be used as electrodes in primary zinc-air batteries and in rechargeable zinc-air batteries and many other energy systems.read more
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Dual Role of Silver Moieties Coupled with Ordered Mesoporous Cobalt Oxide towards Electrocatalytic Oxygen Evolution Reaction.
TL;DR: The dual role of silver moieties is presented and a simple method to increase the OER activity of Co3O4 is demonstrated and it is shown that silver exists as metallic Ag particles and well‐dispersed Ag2O nanoclusters within the mesostructure.
Journal ArticleDOI
Binary N,S-doped carbon nanospheres from bio-inspired artificial melanosomes: A route to efficient air electrodes for seawater batteries
Ziyauddin Khan,Sung O Park,Juchan Yang,Seungyoung Park,Ravi Shanker,Hyun-Kon Song,Youngsik Kim,Sang Kyu Kwak,Hyunhyub Ko +8 more
TL;DR: In this article, N-doped and N,Sdoped carbon nanospheres (NCSs and NSCSs, respectively) are synthesized via pyrolysis of melanosomes, which is a bio-inspired polymer.
Journal ArticleDOI
A simple strategy for tridoped porous carbon nanosheet as superior electrocatalyst for bifunctional oxygen reduction and hydrogen evolution reactions
Yinghua Wang,Shujin Wang,Ruiqing Li,Haibo Li,Zengjing Guo,Baoli Chen,Rui Li,Qingxia Yao,Xianxi Zhang,Hongyan Chen,Ying Li,Konggang Qu,Yao Zheng +12 more
TL;DR: In this paper, a mix-and-pyrolyze strategy was used to fabricate nitrogen, phosphorus, and sulfur-tridoped porous carbon materials, featuring a honeycomb-like nanosheet structure with a high surface area of 711.6 m2/g and high-level dopants including especially 6.61 at% phosphorus.
Journal ArticleDOI
Electronically coupled layered double hydroxide/MXene quantum dot metallic hybrids for high-performance flexible zinc–air batteries
Xiaotong Han,Nannan Li,Peixun Xiong,Min Gyu Jung,Yingbo Kang,Qingyun Dou,Qing Liu,Jin Yong Lee,Ho Seok Park +8 more
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Ligand-protected atomically precise gold nanoclusters as model catalysts for oxidation reactions
TL;DR: A systematic overview of the related oxidation reactions and the understanding of the mechanisms based on atomically precise gold nanoclusters is provided.
References
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Electrical Energy Storage for the Grid: A Battery of Choices
TL;DR: The battery systems reviewed here include sodium-sulfur batteries that are commercially available for grid applications, redox-flow batteries that offer low cost, and lithium-ion batteries whose development for commercial electronics and electric vehicles is being applied to grid storage.
Journal ArticleDOI
Origin of the Overpotential for Oxygen Reduction at a Fuel-Cell Cathode
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TL;DR: In this paper, the stability of reaction intermediates of electrochemical processes on the basis of electronic structure calculations was analyzed and a detailed description of the free energy landscape of the electrochemical oxygen reduction reaction over Pt(111) as a function of applied bias was presented.
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
Universality in Oxygen Evolution Electrocatalysis on Oxide Surfaces
Isabela C. Man,Hai-Yan Su,Federico Calle-Vallejo,Heine Anton Hansen,José I. Martínez,Nilay İnoğlu,John R. Kitchin,Thomas F. Jaramillo,Jens K. Nørskov,Jan Rossmeisl +9 more
TL;DR: In this article, a large database of HO* and HOO* adsorption energies on oxide surfaces was used to analyze the reaction free energy diagrams of all the oxides in a general way.
Journal ArticleDOI
Sulfur and Nitrogen Dual-Doped Mesoporous Graphene Electrocatalyst for Oxygen Reduction with Synergistically Enhanced Performance†
TL;DR: In this paper, Mesoporous graphene doped with both N and S atoms (N-S-G) was prepared in one step and studied as an electrochemical catalyst for the oxygen reduction reaction (ORR).