TECHNOLOGY FOCUS - METALLURGY - Preferred Compound: The metal suboxide has the specific surface area of 1.5-50 m2/g. The metal suboxide comprises less than or equal to 1 wt.% carbon; metal (m1) selected from transition metal and/or post-transition metal. The metal suboxide is a titanium suboxide, and titanium in the titanium suboxide has an oxidation number of +2 to +3.9. The metal suboxide has a pore. Preferred Components: The metal (m1) is selected from titanium (Ti), zirconium (Zr), hafnium (Hf), rutherfordium (Rf), vanadium (V), niobium (Nb), tantalum (Ta), dubnium (Db), chromium (Cr), molybdenum (Mo), tungsten (W), seaborgium (Sg), aluminum (Al), gallium (Ga), indium (In) and/or thallium (Tl). Preferred Method: The mixture is prepared using at least one solvent (s1). The heat treatment is performed at 800-1500 degrees C. The mixture further comprises a pore-forming agent. The method further involves removing the pore-forming agent after removing the carbon. Preferred Reactants: The metal suboxide precursor comprises metal sulfate, metal halide and/or metal alkoxide. The metal suboxide precursor has an average particle diameter of 1-1000 degrees A. The pore-forming agent comprises one selected from silica, alumina, opal, metal particle, surfactant and/or polymer material. The pore-forming agent has an average particle diameter of 0.1-100 nm.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The aromatic compound substituted with a hydroxy group comprises one selected from phenol, dihydroxy benzene, trihydroxy benzene, hydroxy naphthalene, dihydroxy naphthalene, trihydroxy naphthalene, hydroxy anthracene, dihydroxy anthracene, trihydroxy anthracene, hydroxy phenanthrene, dihydroxy phenanthrene, trihydroxy phenanthrene, hydroxy thiophene, dihydroxy thiophene, trihydroxy thiophene, hydroxy furan, dihydroxy furan, trihydroxy furan, hydroxy pyrrole, dihydroxy pyrrole and/or trihydroxy pyrrole. The linking precursor comprises one selected from formaldehyde, acetaldehyde, propionaldehyde, acetone, methylethyl ketone and/or diethyl ketone. The solvent (s1) is selected from water, aromatic hydrocarbons, saturated hydrocarbons, halogenated saturated hydrocarbons, aldehydes, alcohols, ethers, carboxylic acids, esters, ketones, and nitriles. The carbon is amorphous carbon. EXAMPLE - About 2.5 ml Ti2(SO4)3 solution, 0.3 g resorcinol, 0.45 ml formaldehyde, and 125 ml water were put in a beaker and refluxed for 85 degrees C for 24 hours. The reactant was filtered and dried at 80 degrees C for 24 hours. The resulting reactant was heat-treated under an argon atmosphere at 1100 degrees C for 1 hour and under a hydrogen (H2) atmosphere at 1100 degrees C for 4 hours. The heat-treated reactant was added to 250 ml NaOCl solution, and the mixture was agitated at room temperature for 24 hours. The resulting reactant was filtered and then dried at 40 degrees C for 3 hours, preparing a metal suboxide Ti4O7.