The disclosure relates in its first aspect to a process of conversion of a gaseous stream comprising methane into hydrogen (51) and carbon (25), the process is remarkable in that it comprises a step (a) of providing a first gaseous stream (3, 7); a step (b) of bromination and synthesis in which the first gaseous stream (3, 7) is put in contact with a second stream (53) comprising bromine resulting in the formation of a third stream (15) comprising methyl bromides and hydrogen bromide, and of a fourth stream (25) comprising carbon including graphite and/or carbon black; a step (c) of separation performed on the third stream (15) to recover a hydrogen bromide-rich stream (41) which is then oxidized in a step (d) to produce a stream (51) comprising hydrogen. The second aspect relates to the installation for performing the process of the first aspect and the third aspect concerns the use of bromine in such process.

A device for converting biomass into a redox mediator in reduced form, including an assembly of microbial fuel cells including a first compartment including an anode and fermentative microorganisms and electroactive microorganisms, and a second compartment including a cathode and a solution including the mediator, and an external resistor connecting the cathode and the anode. The value of the external resistance of at least one microbial fuel cell is distinct from that of at least one other microbial fuel cell. The device thus makes it possible to induce segregation of fermentative microorganisms and electroactive microorganisms along the assembly.

Disclosed are a metal/carbon-dioxide battery and a hydrogen production and carbon dioxide storage system including the same.

Disclosed are a metal/carbon-dioxide battery and a hydrogen production and carbon dioxide storage system including the same.

The present disclosure provides for a composition that includes a modified M/TiO.sub.2 composite, method of making the modified M/TiO.sub.2 composite, an electrode having modified M/TiO.sub.2 composite surface and a photoelectrochemical cell including the electrode, and methods of photoelectrochemical oxidation of water. The modified M/TiO.sub.2 composite can be used in an electrode configuration, for example, in a photoelectrochemical cell for the photoelectrochemical oxidation of water. The present disclosure provides for a modified M/TiO.sub.2 composite that has a catechol compound(s) (e.g., oligo-catechol) adsorbed onto at least the M (metal) on the surface of the modified M/TiO.sub.2 composite.

The present disclosure provides for a composition that includes a modified M/TiO.sub.2 composite, method of making the modified M/TiO.sub.2 composite, an electrode having modified M/TiO.sub.2 composite surface and a photoelectrochemical cell including the electrode, and methods of photoelectrochemical oxidation of water. The modified M/TiO.sub.2 composite can be used in an electrode configuration, for example, in a photoelectrochemical cell for the photoelectrochemical oxidation of water. The present disclosure provides for a modified M/TiO.sub.2 composite that has a catechol compound(s) (e.g., oligo-catechol) adsorbed onto at least the M (metal) on the surface of the modified M/TiO.sub.2 composite.

Herein discussed is a method of producing hydrogen comprising: (a) providing an electrochemical reactor having an anode, a cathode, and a membrane between the anode and the cathode; (b) introducing a first stream to the anode, wherein the first stream comprises ammonia or a product from ammonia cracking; (c) introducing a second stream to the cathode, wherein the second stream comprises water; and wherein hydrogen is generated from water electrochemically without electricity input. Systems for producing hydrogen from ammonia are also discussed.

Systems and methods to upgrade a feedstock include a metal/oxygen electrochemical cell having a positive electrode, a negative electrode and an electrolyte in which the cell is configured to produce superoxide. The superoxide can react or complex with a feedstock to upgrade the feedstock.

Systems and methods to upgrade a feedstock include a metal/oxygen electrochemical cell having a positive electrode, a negative electrode and an electrolyte in which the cell is configured to produce superoxide. The superoxide can react or complex with a feedstock to upgrade the feedstock.

A fuel cell energy circulative utilization system includes an input energy, a first electric cell having an electricity output terminal and an energy output terminal, a second electric cell having an electricity input terminal, an energy input terminal, and an energy output terminal, and an energy circulation control device connected among the first and second electric cells and the input energy. The input energy includes an energy source containing hydrocarbons or hydrogen and connected to an energy input port of the first electric cell in order to make the first electric cell outputs electricity through the electricity output terminal and energy products of thermal energy and water through the energy output terminal. The electricity output terminal and the energy output terminal for thermal energy and water of the first electric cell are respectively connected to the electricity input terminal and the energy input terminal of the second electric cell, in order to make the second electric cell to at least output a hydrogen source through the energy output terminal thereof to the energy circulation control device, so that the energy circulation control device controls circulation of hydrogen for feeding to the energy input terminal of the first electric cell for reuse. The energy circulation control device is also operable to switch operations of the first and second electric cells between working modes of solid oxide electrolysis cell and solid oxide fuel cell.