▎ 摘　　要

In this paper, a novel way for high value-added application of lignosulfonate is presented. In this study, we use lignosulfonate nanosheets to fabricate a free-standing, binder-free, ultrathin and light-weight conductive film electrode via vacuum filtration method. The results show that LS is a promising candidate material for the preparation of electrochemical capacitor film electrode. It is worth mentioning that we use non-toxic, pollution-free aqueous solution (water) over organic solvents as the dispersion during the reductive graphene oxide (RGO) preparation process. The electrochemical measurements exhibit that the resistivity of lignosulfonate nanosheets/RGO (LNRGO) film electrode is 0.66 x 10(-3) k Omega cm(-1). The specific capacitance of the LNRGO film electrode is calculated to be 120 mF cm(-2) at the current density of 0.2 mA cm(-2), which is approximately 6.67 times larger than that of RGO-water film electrode. (C) 2020 Published by Elsevier B.V.