TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Process: The temperature of the heat-treatment is 600-900degreesC. Preferred Components: The representative diameter of the fine pores is 1 nm to 10 microns. The carbon-reactive catalyst metal is at least one of platinum, gold, silver, copper, palladium, ruthenium or iridium; or alloy of platinum, gold, silver, copper, palladium, ruthenium or iridium. EXAMPLE - Diamond particles (average particle diameter: 40 nm) to which boron (1000 parts per million (ppm)) was added, were poured in an aqueous solution of dinitrodiammine platinum (1 mM), followed by agitating, further followed by drying at 60degreesC. Under flow of 0.1 MPa of 10% H2+N2 (90%), the mixture was processed at 700degreesC for 3 hours to form fine pores on a surface of an electrode. A dimension of fine pores was observed with atomic force microscope (AFM) and found to distribute in the range of 5-10 nm and its depth was 5 nm. Platinum particles on the surface were remained only in diamond pores. The amount of precipitated platinum per gram of diamond was 0.05 g. The catalyst particles, a slight amount of Triton (RTM: surfactant), water, Nifion (RTM: polymer solid electrolyte solution) and 30J (RTM: an aqueous suspension of polytetrafluoroethylene (PTFE) fluoro-resin) were added to prepare a slurry (volume ratio of catalyst and resin was 1:1). The slurry was coated on a carbon cloth substrate to form a catalyst and two gas diffusion electrodes were prepared. The amount of diamond of each of the electrodes (test) was set at 100 g/m2. The electrode area was 20 cm2. In a gap between the two porous electrodes, Nafion 112 (RTM: polymer solid electrolyte) was interposed, followed by hot pressing at 130degreesC for 5 minutes to integrate. Nickel foam was disposed as an individual current collector on a backside of each of electrodes, followed by clamping by graphite-power supply bodies provided with a groove to assemble a cell. Hydrogen and oxygen was supplied to the respective electrode chambers at 10 ml/minutes. In the hydrogen gas, CO gas (100 ppm) was mixed. With a temperature set at 90degreesC, relationship between a voltage and a current was measured and a cell voltage of 0.65V was obtained at current of 20A. After 50 days operation, there was no deterioration of the cell performance. With a commercially available gas diffusion electrode (ELAT) in which on furnace black particles having an average particle diameter of 50 nm, a catalyst containing platinum (5 wt.%) was formed at 100 g/m2 as an electrode in a similar manner as the test. A fuel cell test was carried out. The relationship between a voltage and a current was measured and a cell voltage of 0.65V was obtained at current of 20A. After 50 days operation, the cell voltage was lowered to 0.6V and the performance of the control cell was deteriorated.