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The research group has discovered a new type of catalyst—the rhodium metal catalyst is of great significance for the oxidation of water molecules. It has been theoretically and practically studied that the combination of rhodium metal and benzoquinone molecules can effectively catalyze the oxidation of water to oxygen. In order to complete the oxidation reaction of water molecules, they immobilized the rhodium catalyst on the electrode and placed it in an aqueous solution. The applied voltage generates a rapid current to oxidize water molecules to oxygen. At present, they are further studying the specific working principle of the catalyst.
Because of the high price of ruthenium metal catalysts, scientists will further research to find inexpensive metal catalysts that are cheap.
Scientists at the US Department of Energy's Brookhaven National Laboratory and the Japan Institute of Molecular Science are simulating the natural processes of complex photosynthesis for the purpose of preparing non-polluting fuels, such as hydrogen fuel for fuel cells. Scientists said in an "Oxygen Making" forum reported in the journal Inorganic Chemistry that they are capable of simulating the catalytic oxidation of water in the photosynthesis process in nature. Water oxidation, which is part of photosynthesis, is also a very complex reaction in the process of “water cracking†(hydrolysis of water into hydrogen and oxygen). Hydrolysis of water requires large amounts of solar energy and metal catalysts to activate the stable water molecules. This reaction is accompanied by two separate semi-reactions: the oxidation of water molecules to oxygen, the production of protons and electrons, and the combination of protons and electrons to produce hydrogen molecules.