The present disclosure relates to a metal-air battery, such as a zinc (Zn)-air battery with a decoupled cathode, an acidic catholyte, an alkaline anode electrolyte, and a solid electrolyte between the catholyte and the anode electrolyte.

The present invention provides a method for producing a fuel cell electrode which is configured to be able to deliver stable electricity generation performance even if the humidity condition of the external environment is changed. Disclosed is a method for producing a fuel cell electrode comprising a catalyst layer that contains a catalyst composite-carried carbon containing platinum, a titanium oxide and an electroconductive carbon, wherein the method comprises: a first step of decreasing an amount of acidic functional groups on a surface of the catalyst composite-carried carbon by firing the catalyst composite-carried carbon at 250 C. or more; a second step of producing a catalyst ink by mixing the catalyst composite-carried carbon obtained in the first step, an ionomer, and a solvent; and a third step of forming the catalyst layer using the catalyst ink obtained in the second step.

The invention relates to a process for preparing nanoparticles of a catalyst for cathodic reduction and which is tolerant to methanol, these nanoparticles comprising a metallic center and a submonolayer of a chalcogen.

An electrode catalyst is configured such that non-noble metal particles, noble metal particles or nitride-doped noble metal particles are supported on a carbon support, wherein the carbon support has a 2D planar crystal structure or a 3D polyhedral crystal structure and is doped with nitrogen, thereby exhibiting increased catalytic activity.

The invention provides electrodes suitable for use as air electrodes, processes for their preparation and metal/air cells utilizing such electrodes as air cathodes. The invention relates to an electrode comprising a catalytically active layer applied on one face of a hydrophobic porous film and a conductive current collector pressed onto said catalytically active face, wherein at least a portion of the marginal area of said face is free from catalyst, and wherein a sealant is provided around at least part of the perimeter of said catalytically active layer, said sealant forming a coating onto the catalyst-free marginal area of said hydrophobic film.

An apparatus including an oxidation cell configured to oxidize carbon monoxide to produce carbon dioxide; and a sensor configured to detect carbon dioxide produced by the oxidation cell.

The present invention is to provide fine catalyst particles with better catalytic performance than ever before and a carbon-supported catalyst with better catalytic performance than ever before. Disclosed is a method for producing fine catalyst particles, comprising: a potential applying step of applying a potential to the fine palladium-containing particles in a first dispersion, until a peak indicating a Pd{111} surface in a reduction wave of a cyclic voltammogram becomes larger than a peak indicating a Pd{110} or Pd{100} surface in the reduction wave of the cyclic voltammogram; a copper covering step of covering at least part of the fine palladium-containing particle with copper by preparing a second dispersion by mixing the first dispersion and a copper-containing solution after the potential applying step, and applying a potential that is nobler than the oxidation-reduction potential of copper to the fine palladium-containing particles in the second dispersion; and a platinum covering step of covering at least part of the fine palladium-containing particle with platinum by mixing the second dispersion and a platinum-containing solution after the copper covering step.

The invention provides a nitrogen-functionalized platinum-transition metal catalyst having the formula Pt-M-N.sub.x/C (where M is a transition element such as Fe, Co, Ni, Nb, Ta, Ir, Rh, or Ru) for use at the hydrogen electrode of a hydrogen/bromine redox flow battery. The new catalyst possesses excellent activity and durability in the HBr/Br.sub.2 environment, showing superior resistance to halide poisoning than conventional Pt/C or Pt-M/C catalysts.

The present disclosure relates to a positive electrode for a lithium-air battery and a method for preparing the same, and the positive electrode for a lithium-air battery according to the present disclosure has advantages in that it improves electrical conductivity and mechanical strength of an electrode, and increases loading amounts.

The present invention relates to an electrode for use in electrochemical cells and systems, such as rechargeable batteries, having a metal substrate and a catalytic coating applied onto the substrate. The catalytic coating has a mixture of noble metals or noble metal oxides and can be used to improve the energy efficiency of the cell.