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Hierarchical porous carbons are successfully prepared from a readily water-soluble biomass sodium alginate with the assistance of Fe3+ and Ni2+ via a simple sol–gel method. The drying method and separation ways of ionically-crosslinked alginate gels could significantly affect the morphologies of the precursors and the porous structures for the carbons. By adjusting the amounts of FeCl3·6H2O, we can...
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