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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Journal ArticleDOI
Probing the Oxygen Reduction Reaction Active Sites over Nitrogen-Doped Carbon Nanostructures (CNx) in Acidic Media Using Phosphate Anion
Kuldeep Mamtani,Deeksha Jain,Dmitry Zemlyanov,Gokhan Celik,Jennifer Luthman,Gordon Renkes,Anne C. Co,Umit S. Ozkan +7 more
TL;DR: In this paper, the effect of dihydrogen phosphate (H2PO4)-anion on their oxygen reduction reaction (ORR) performance was investigated by adding increasing concentrations of phosphoric acid in half-cell measurements.
Journal ArticleDOI
Porous cobalt phosphide/graphitic carbon polyhedral hybrid composites for efficient oxygen evolution reactions
TL;DR: In this article, a hybrid composite constructed from ultrasmall CoP nanoparticles embedded within N-doped graphitic carbon polyhedra (CoP@GC) through simultaneous pyrolysis and phosphidation of a preformed Co-based zeolitic imidazolate framework (ZIF-67) is presented.
Journal ArticleDOI
Clarifying the Controversial Catalytic Performance of Co(OH)2 and Co3O4 for Oxygen Reduction/Evolution Reactions toward Efficient Zn–Air Batteries
TL;DR: A facile electrochemical deposition method to grow Co(OH)2 directly on the skeleton of carbon cloth is developed, eliminating uncertainties arising from the electrode preparation procedures, and the Co3O4 catalyst has been further evaluated by integrating it into a Zn-air battery prototype.
Journal ArticleDOI
High‐Performance Li‐CO2 Batteries Based on Metal‐Free Carbon Quantum Dot/Holey Graphene Composite Catalysts
Yachao Jin,Yachao Jin,Chuangang Hu,Quanbin Dai,Ying Xiao,Yi Lin,John W. Connell,Fuyi Chen,Liming Dai +8 more
Journal ArticleDOI
Highly active and durable carbon electrocatalyst for nitrate reduction reaction
TL;DR: It is proposed that the iron nanoparticles could attenuate the work function on the neighboring carbon atoms, which are the reactive sites for NRR, and that the graphitic shells hinder the access of the electrolyte, thus protecting the iron particles from dissolution and oxidation.
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
Jens K. Nørskov,Jan Rossmeisl,and Ashildur Logadottir,L. Lindqvist,John R. Kitchin,Thomas Bligaard,Hannes Jónsson +6 more
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).