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Porous hollow carbon spheres (PHCSs) are prepared through hydrothermal carbonization of alginic acid and subsequent chemical activation by KOH. The porosity of the alginic acid derived PHCSs can be finely modulated by varying activation temperature in the range of 600–900 °C. The PHCSs activated at 900 °C possess the largest specific surface area (2421 m2 g−1), well-balanced micro- and mesoporosity,...
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