A positive electrode catalyst, for use in a positive electrode in a device provided with the positive electrode and a negative electrode, in which a reaction represented by 4OH.sup..fwdarw.O.sub.2+2H.sub.2O+4e.sup. is performed on a side of the positive electrode. The positive electrode catalyst includes a layered metal oxide, wherein the layered metal oxide is a Ruddlesden-Popper type layered perovskite represented by (La.sub.1-xA.sub.x) (Fe.sub.1-yB.sub.y).sub.3(Sr.sub.1-zC.sub.z).sub.3O.sub.10-a wherein, A is a rare earth element other than La, B is a transition metal other than Fe, and C is an alkaline earth metal other than Sr; and x satisfies an expression: 0x<1, y satisfies an expression: 0y<1, z satisfies an expression: 0z<1, and a satisfies an expression: 0a3.

According to embodiments of the present disclosure, a method of producing hydrogen in a fuel cell includes passing ammonia under pressure to an anode of the fuel cell, where the ammonia is decomposed into nitrogen gas and protons. The fuel cell comprises a cathode, the anode, and a proton-conducting electrolyte between the anode and the cathode. The anode includes an ammonia decomposition catalyst. The method further includes passing the purging the nitrogen from the anode, passing the protons through the proton-conducting electrolyte to the cathode, and passing the electrons from the anode to the cathode, wherein the protons and the electrons react to produce substantially pure hydrogen gas under pressure.

A method of forming ethylene is disclosed. The method includes introducing oxygen-containing molecules to a first electrode of an electrochemical cell including the first electrode, a second electrode, and an electrolyte between the first electrode and the second electrode. The second electrode includes at least one catalyst material formulated to accelerate oxidative coupling of methane (CH.sub.4) (OCM) reaction rates to produce C.sub.2H.sub.4 from CH.sub.4 and oxygen ions. The method further includes introducing CH.sub.4 to the second electrode of the electrochemical cell. The method also includes applying a potential difference in electrolysis mode between the first electrode and the second electrode of the electrochemical cell. The oxygen-containing molecules interact with the second electrode to produce O.sup.2 through reduction of the oxygen-containing molecules, the O.sup.2 are transported through the electrolyte, and C.sub.2H.sub.4 is produced at the second electrode through OCM. A system and an electrochemical cell for producing ethylene are also disclosed.

A hybrid LSCFP-based electrode includes an electrode having porous pores formed between a plurality of nanofibers and pulverized nanofibers positioned within the porous pores, to solve the contact problem at a solid electrolyte interface, thereby providing excellent characteristics of electrolytic performance and stability at high temperatures, and providing a method for manufacturing a hybrid LSCFP-based electrode by a simple method.

An electrode suitable for carrying out oxygen evolution reaction in the electrolysis of water in alkaline conditions. The electrode includes a ceramic material having a stability factor (SF) between 1.67SF2.8 and which is calculated by formula (II), where r.sub.O is the ionic radius of oxide ion (O.sup.2), r.sub.B,av is the weighted average ionic radius of a transition metal, n.sub.A,Av is the weighted average oxidation state of a rare earth or alkaline earth metal, r.sub.A,av is the weighted average ionic radius of a rare earth or alkaline earth metal. An alkaline electrolysis stack includes the electrode, as well as a method for the electrolysis of water in alkaline conditions using the alkaline electrolysis stack.

A material for an electrode, the material for as well as a method of making the material for an electrode comprising or consisting of a compound of formula (1)
M2Ni1xCoxO4+
and/or of formula (2)
La1yMyNi1xCoxO4+ where M represents Pr and/or Nd, 0.0x0.2, 0.250.3 and 0<y10 0.5.

An electrochemical cell is disposed of a fuel electrode layer, a solid electrolyte layer, and an air electrode layer, in this order. The air electrode layer includes a plurality of catalyst particles for an air electrode which is composed of a catalyst material, a plurality of electrolyte particles for the air electrode which is composed of a solid electrolyte material, and at least one pore. The catalyst material has a coefficient of linear thermal expansion at 700 C. within a range of greater than 15x10.sup.6/K and less than 30x10.sup.6/K. When a first total surface area of the catalyst particles is S.sub.cat, and a second total surface area of an interface portion where a first surface of the catalyst particles is in contact with a second surface of the electrolyte particles is S.sub.cat-ele, the air electrode lay has a value of S.sub.cat-ele/S.sub.cat of 0.6 or more.

A solid ionic conducting material for use in an electrochemical device comprises an oxyhydroxide or hydrated oxide derived from of an oxide with a perovskite, Brownmillerite, layered oxide, and/or K.sub.4CdCl.sub.6 structure, the elemental composition of the initial oxide being selected to provide suitable conduction properties for the derived anhydrous or hydrated oxyhydroxide or hydrated oxide. A method of making such a solid ionic conducting material, including treatment with water, and an electrochemical device incorporating such a solid ionic conducting material (optionally as an electrolyte) are also disclosed.

The present disclosure relates to an oxygen electrode for solid oxide electrolysis cell and a method of manufacturing the same.

A solid oxide electrolysis cell includes an oxygen electrode, a fuel electrode, and an electrolyte interposed between the oxygen electrode and the fuel electrode. The oxygen electrode comprises an oxygen electrode carrier comprising internal pores, and an oxygen electrode catalyst supported in the internal pores, and having a perovskite single-phase structure. The fuel electrode comprises a fuel electrode carrier and a fuel electrode catalyst supported on the fuel electrode carrier.