TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Precursor: In the catalyst precursor, at least one of the thermally decomposable porous support, the non-precious metal precursor or the organic coating/filling compound comprises nitrogen, where the thermally decomposable porous support is microporous and is one or more supports selected from metal-organic-frameworks, covalent-organic-frameworks, polymer-organic-frameworks, microporous organic polymers, polymers of intrinsic microporosity and a microporous polymers. The metal organic framework comprises a zeolitic imidazolate framework, where the zeolitic imidazolate framework comprises ZIF-8. The metal of the zeolitic imidazolate framework comprises zinc. The thermally decomposable porous support comprises a metal organic framework and the metal is one or more selected from zinc, cobalt, manganese, magnesium, iron, copper, aluminum and chromium. The thermally decomposable porous support has a total surface area of greater than 500 m2/g, or greater than 1000 m2/g, or greater than 1500 m2/g. The thermally decomposable porous support is one that loses between 20% and 90% of its mass in an inert atmosphere at a temperature in the range of 100-1200 degrees C. The thermally decomposable porous support is one that loses at least 50% of its mass in an inert atmosphere at a temperature in the range of 100-1200 degrees C. The non-precious metal precursor is a precursor of iron or cobalt, where the non-precious metal precursor is a precursor of iron. The catalyst precursor comprises an iron loading of about 0.2-5 wt.%, preferably 1-2 wt.% or more based on the total weight of the catalyst precursor. The non-precious metal precursor is a salt of a non-precious metal or an organometallic complex of a non-precious metal. The non-precious metal precursor is iron (Fe)(II) acetate. The non-precious metal precursor and the organic coating/filling compound are the same molecule, where the organic coating/filling compound comprises a poly-aromatic structure. The organic coating/filling compound is selected from perylene-tetracarboxylic-dianhydride, 1,10-phenanthroline, perylene tetracarboxylic-diimide, and polypyrrole or polyaniline and mixtures. The mass ratio of organic coating/filling compound to thermally decomposable porous support is about 95:5 to about 5:95. The catalyst precursor has been pyrolyzed so that the micropore surface area of the catalyst is substantially larger than the micropore surface area of catalyst precursor, with the proviso that the pyrolysis is performed in the presence of a gas that is a nitrogen precursor when the thermally decomposable porous support, the non-precious metal precursor and the organic coating/filling compound are not nitrogen precursors. The pyrolysis temperature is between 300 degrees C and 1200 degrees C, preferably 700 degrees C, where a mass loss during pyrolysis is greater than 50-80%. Preferred Catalyst: The catalyst comprises a nitrogen content of about 0.5 wt.% or more based on the total weight of the catalyst. The catalyst is an oxygen reduction catalyst, a catalyst for the electroreduction of hydrogen peroxide, a catalyst for the disproportionation of hydrogen peroxide or a catalyst for the reduction of carbon dioxide (CO2), where the catalyst is an oxygen reduction catalyst. Preferred Method: Producing the catalyst precursor further comprises: (c) pyrolysing the catalyst precursor so that the micropore surface area of the catalyst is substantially larger than the micropore surface area of the catalyst precursor, with the proviso that the pyrolysis is performed in the presence of a gas that is a nitrogen precursor when the thermally decomposable porous support, the non-precious metal precursor and the organic coating/filling compound are not nitrogen precursors. The thermally decomposable porous support loses between 20% and 90% of its mass. The non-precious metal precursor comprises iron or cobalt. EXAMPLE - No suitable example given.