A composite photocatalyst, a method of producing said composite photocatalyst, a method of degrading an organic pollutant using the composite photocatalyst, and a method of producing hydrogen using the composite photocatalyst. The composite photocatalyst includes graphene, tungsten oxide, a metal boride, and a metal hydroxide. The photocatalyst is capable of degrading an organic pollutant when exposed to light. The photocatalyst is also capable of producing hydrogen from water when exposed to light under suitable conditions.

Embodiments of the invention are directed to methods, processes, and systems for safely and reliably purifying hydrogen from a gas mixture containing hydrogen and oxygen.

A breathing mask includes a mask body unit and a container. The mask body unit includes a mask body having an inner surface configured to cooperate with a user's face to define an interior space therebetween, and two straps respectively connected to two opposite sides of the mask body. The container has a container body defining a chamber for receiving working liquid and formed with a plurality of vent holes for communicating the chamber with the interior space. At least one gas generating unit is connected to the container, and includes an electrolysis device disposed in a casing thereof for electrolyzing the working liquid into a hydrogen/oxygen gas mixture.

Embodiments of the invention are directed to methods, processes, and systems for safely and reliably purifying hydrogen from a gas mixture containing hydrogen and oxygen.

The present disclosure is directed to the integration of direct air capture of carbon dioxide with thermochemical water splitting, the latter optionally driven by solar energy. The disclosure is also directed to a process comprising extracting carbon dioxide from an air stream by contacting the air-stream with an alkali metal ion-transition metal oxide of empirical formula A.sub.xMO.sub.2 (0.1<x1), where A represents the alkali metal ion comprising sodium ion, potassium ion, or a combination thereof and M comprises iron, manganese, or a combination thereof to form a transition metal composition comprising an oxidized ion extracted-transition metal oxide.

Photocatalysts and methods of using the same for producing hydrogen and oxygen from water are disclosed. The photocatalysts include photoactive titanium dioxide loaded with 0.5 wt. % to 4 wt. % of a hole-scavenging material comprising cobalt oxide and 0.1 wt. % to 1 wt. % of palladium (Pd) and/or a PdCo alloy.

Embodiments of the invention are directed to methods, processes, and systems for safely and reliably purifying hydrogen from a gas mixture containing hydrogen and oxygen using a cryogenic separation method.

An improved electrolysis system is disclosed in which the tank is designed to operate with a plurality of electrodes that are connected in a parallel plate configuration to a DC power source. The electrode geometry provides a means in which the height of the electrodes is lessened by increasing the length of the electrodes to provide the necessary area for any given current input. The lessened height of the electrode reduces the travel path of the gases escaping to the surface thereby reducing the void fracture height area of the bubbles and increasing the overall system efficiency. Additional efficiencies are obtained with a high surface area of contact between the electrical bus segments and the electrodes.

A system and method for supplying an energy grid with energy from an intermittent renewable energy source having a production unit for producing Hydrogen, Nitrogen, and Oxygen. The production unit is operated by using energy provided by the renewable energy source. An Oxygen storage receives and stores Oxygen produced by the production unit, a mixing unit receives and mixes the Hydrogen and the Nitrogen produced by the production unit to form a Hydrogen-Nitrogen-mixture, an Ammonia source receives and processes the Hydrogen-Nitrogen-mixture for generating a gas mixture containing Ammonia, an Ammonia power generator generates energy for the energy grid. The Ammonia power generator is fluidly connected to the Ammonia storage vessel, is configured to combust the received Ammonia in a combustion chamber to generate the energy, and is fluidly connected to the Oxygen storage to introduce Oxygen into the combustion chamber for combustion of Ammonia.

A photocatalytic member comprises a base and a photocatalytic layer fixed on the base. The photocatalytic layer comprises first photocatalyst particles being visible light responsive photocatalyst particles for hydrogen generation, second photocatalyst particles being visible light responsive photocatalyst particles for oxygen generation, and conductive particles which are provided between the first photocatalyst particle and the second photocatalyst particle, have Fermi level at a negative position relative to an electronic energy level at the upper end of the valence band of the first photocatalyst particle and at a positive position relative to an electronic energy level at the bottom end of the conduction band of the second photocatalyst particle, and are able to store an electron and a hole. In the photocatalytic layer, the conductive particles are located to be coupled to both the first photocatalyst particles and the second photocatalyst particles.