Introduction In recent years hydrothermal carbonization (HTC) has demonstrated its capability of converting biomass into carbon materials (called hydrochar) under very mild processing conditions [1]. Unfortunately, the hydrochar materials have the drawback of possessing almost no porosity, unless it is synthesized in the presence of a template or subjected to additional heat treatment at higher temperature [2]. To make possible the use of porous materials based on hydrochar in emergent applications, such as gas storage (natural gas, CO_2 or hydrogen storage) or electrical energy storage (such as supercapacitors), the synthesis of highly microporous carbon materials based on these materials is required. As reviewed in detail in a previously published study [3], chemical activation by KOH and NaOH is a way to successfully prepare highly microporous activated carbons (ACs) from very different precursors. Therefore, it is challenging to develop high micropore volumes in this type of material.
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