LAUSR

A low-priced, ecofriendly and sustainable strategy to fabricate materials of superior electrochemical property is of paramount importance for the development of supercapacitors (SCs). Herein, heteroatoms-doped porous carbons (HPCs) were prepared from waste newspapers (WNPs) with the assistance of cellulose solvent, i.e., aqueous solution consisting of NaOH, urea, and thiourea (NUT, for short); subsequently, the resultant HPCs were applied as materials for SCs electrodes. Innovatively, the NUT solution acts simultaneously as solvent for WNPs, activating agent, and co-dopants (N, S, and O) in the subsequent preparation of HPCs materials. Interestingly, the porous structure and doping content of HPCs are tunable by changing the related feed ratio between NaOH and WNPs (WNaOH/WWNPs = 0.5, 1.0, and 1.5), along with the pyrolysis temperature (600, 700, and 800 °C). The appropriate porosity along with the surface doped by heteroatoms (N, S, and O) of the obtained HPCs result in superior electrochemical performan...