Method for decomposing and purifying biomass, organic material or inorganic material with high efficiency and simultaneously generating electricity and producing hydrogen, and direct biomass, organic material or inorganic material fuel cell for said method

A fuel cell comprising a composite anode and a counter cathode for oxygen reduction and decomposing and purifying a fuel and generating electric power through a fuel cell reaction without applying external energy thereto, wherein

• (a) the composite anode is composed of three layers including;
• a conductive electrode base layer/a porous semiconductor layer/a catalyst layer, the porous semiconductor layer being deposited on the conductive electrode base layer, the catalyst layer made of a metal, a metal oxide, or a semiconductor being formed on the semiconductor layer, wherein
• (b) the composite anode is immersed in, or in contact with, a liquid phase comprised of an aqueous solution or an aqueous suspension that contains as the fuel at least one of or a mixture of biomass, biomass waste, and organic/inorganic compounds, wherein
• (c) the counter cathode for oxygen reduction is disposed in the liquid phase comprised of the aqueous solution or the aqueous suspension or in an liquid phase/gas phase interface where the liquid phase is in contact with a gas phase, and wherein
• (d) the fuel cell is configured to supply oxygen into, or cause oxygen to coexist, in the liquid phase or the liquid phase/gas phase interface where the cathode is disposed, thereby inducing the fuel cell reaction on the cathode, decomposing and purifying the fuel and generating electric power through the fuel cell reaction without applying external energy thereto.

A method for executing fuel-cell power generation without applying external energy thereto and simultaneously producing a pure metal using a cathode, the method comprising:

• (a) providing a composite anode composed of three layers including;
• a conductive electrode base layer/a porous semiconductor layer/a catalyst layer, the porous semiconductor layer being deposited on the conductive electrode base layer, the catalyst layer made of a metal, a metal oxide, or a semiconductor being formed on the semiconductor layer;
• (b) immersing the composite anode in, or bringing the composite anode into contact with, a liquid phase comprised of an aqueous solution or an aqueous suspension that contains as the fuel at least one of or a mixture of biomass, biomass waste, and organic/inorganic compounds;
• (c) disposing a counter cathode for oxygen reduction in the liquid phase comprised of the aqueous solution or the aqueous suspension or in an liquid phase/gas phase interface where the liquid phase is in contact with a gas phase;
• and
• (d) maintaining an ambience in the liquid phase where the composite anode is disposed, or the liquid phase/gas phase interface to be under an anaerobic condition, causing an oxide, a salt, and a complex of a metal produced by oxidizing a metal ore, a collected metal, or a scrap metal to co-exist as an electron acceptor in the liquid phase or the liquid phase/gas phase interface, and thereby inducing the fuel cell reaction on the cathode, producing a pure metal and generating electric power without applying external energy thereto.

A fuel cell comprising a composite anode and a counter cathode for oxygen reduction, executing fuel-cell power generation without applying external energy thereto, and simultaneously producing a pure metal at the cathode, wherein

• (a) the composite anode is composed of three layers including;
• a conductive electrode base layer/a porous semiconductor layer/a catalyst layer, the porous semiconductor layer being deposited on the conductive electrode base layer, the catalyst layer made of a metal, a metal oxide, or a semiconductor being formed on the semiconductor layer, wherein
• (b) the composite anode is immersed in, or in contact with, a liquid phase comprised of an aqueous solution or an aqueous suspension that contains as the fuel at least one of or a mixture of biomass, biomass waste, and organic/inorganic compounds, wherein
• (c) the counter cathode for oxygen reduction is disposed in the liquid phase comprised of the aqueous solution or the aqueous suspension or in a liquid phase/gas phase interface where the liquid phase is in contact with a gas phase, and wherein
• (d) an ambience in the liquid phase or the liquid phase/gas phase interface where the cathode is disposed is maintained to be under an anaerobic condition, and an oxide, a salt, or a complex of a metal produced by oxidizing a metal ore, a collected metal, or a scrap metal, is caused to co-exist as an electron acceptor in the liquid phase or the liquid phase/gas phase interface, and thereby the fuel cell reaction is induced on the cathode, and producing the pure metal at the cathode and generating electric power without applying external energy thereto.

A method using a composite anode, of executing micro-fuel-cell electric power generation on the anode and simultaneously producing hydrogen on the anode, without applying external energy thereto, wherein

• (a) the composite anode is composed of three layers including;
• a conductive electrode base layer/a porous semiconductor layer/and a catalyst layer, the porous semiconductor layer being deposited on the conductive electrode base layer, the catalyst layer made of a metal, a metal oxide, or a semiconductor, being formed on the semiconductor layer, wherein
• (b) the composite anode is immersed in, or in contact with, a liquid phase comprised of an aqueous solution or an aqueous suspension that contains as the fuel at least one of or a mixture of biomass, biomass waste, and organic/inorganic compounds, and wherein
• (c) an ambience in the liquid phase where the anode is disposed to be under an anaerobic condition, and the anode acts as a micro cell and, on the anode electrons being injected from the fuel in the liquid phase comprised of the aqueous solution or the aqueous suspension, and the injected electrons are being delivered to protons in the liquid phase comprised of the aqueous solution or the aqueous suspension, thereby producing hydrogen, and generating electric power without applying external energy thereto.

A micro fuel cell comprising a composite anode, executing micro-fuel-cell electric power generation on the anode without applying external energy thereto, and simultaneously producing hydrogen on the anode, wherein

• (a) the composite anode is composed of three layers including;
• a conductive electrode base layer/a porous semiconductor layer/a catalyst layer, the porous semiconductor layer being deposited on the conductive electrode base layer, the catalyst layer made of a metal, a metal oxide, or a semiconductor being formed on the semiconductor layer, wherein
• (b) the composite anode is immersed in, or in contact with, a liquid phase comprised of an aqueous solution or an aqueous suspension that contains as fuel at least one of or a mixture of biomass, biomass waste, and organic/inorganic compounds, and wherein
• (c) an ambience in the liquid phase where the composite anode is disposed is maintained to be under an anaerobic condition, and the anode acts as a micro cell and, on the anode electrons being injected from the fuel in the liquid phase comprised of the aqueous solution or the aqueous suspension, and the injected electrons are being delivered to protons in the liquid phase comprised of the aqueous solution or the aqueous suspension, thereby producing hydrogen, and generating electric power simultaneously without applying external energy thereto.