Left: Micropillar silicon with cobalt catalysts reduces carbon dioxide (CO2) to methanol (CH3OH). Right: Porous silicon with rhenium catalysts reduces carbon dioxide (CO2) to carbon monoxide (CO).
Rhenium and technetium not only share the same group in the periodic table, but also have some common history relating to how they were — or indeed weren't — discovered. Eric Scerri explains ...
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