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  _____      ___       _____    _____    __   _   
 / ____||   / _ \\    / ___//  |  ___|| | || | || 
/ //---`'  / //\ \\   \___ \\  | ||__   | '--' || 
\ \\___   |  ___  ||  /    //  | ||__   | .--. || 
 \_____|| |_||  |_|| /____//   |_____|| |_|| |_|| 
  `----`  `-`   `-` `-----`    `-----`  `-`  `-`

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Text this: Rationally designed hierarchical N-doped carbon@NiCo2O4 double-shelled nanoboxes for enhanced visible light CO2 reduction