Text this: Photocatalyst systems containing earth abundant elements for photocatalytic H2 or O2 production from water.

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 | |_| ||   -| ||-   `____ `    -| ||-   |    \\  
 | .  //    _| ||_   /___//     _| ||_   | [] ||  
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 `-` --`   `-----`   /_//      `-----`   |_|`-`   
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