Self‐doping porous carbon materials synthesis from bio‐wastes sodium lignosulfonate with high performance for supercapacitors. (7th October 2021) - Mo, Lanlan
Summary: A facile method for synthesis of biomass‐derived porous carbon from bio‐wastes sodium lignosulfonate is proposed. Using neutral reagent KNO3 as activator and nitrogen source, the porous carbon materials with three‐dimensional hierarchical porous structure interconnected oxygen, nitrogen and sulphur co‐doped are prepared via simple and efficient lyophilisation and a one‐step carbonization. The porous carbon carbonized at 800°C possesses high specific surface area (2400 m 2 g −1 ) and moderate oxygen (9.15 at%), nitrogen (2.35 at%) and sulphur (0.37 at%) contents. As a result, the GSLS‐800 achieves an ultrahigh specific capacitance of 389.7 F g −1 with 1 A g −1 as well as 92.3% capacitance retention with 10 000 cycles at 10 A g −1 under 3 M KOH three‐electrode system. Furthermore, the solid‐symmetric supercapacitor aggregated by GSLS‐800 delivers a high energy density of 27.26 W h kg −1 under a power density of 487.75 W kg −1 and presents a favourable retention capacity of 89.6% at 10 A g −1 after 10 000 cycles. This work extends high value‐added utilization of biomass derivatives in energy storage applications. Abstract : An innovative method for synthesis of O/N/S porous carbon by lyophilisation and one‐step carbonization from bio‐wastes sodium lignosulfonate (SLS) for supercapacitor. The GSLS‐800 exhibits excellent specific capacitance and cycle stability. The symmetric supercapacitor assembled by GSLS‐800 achieves an ascendant balance in energy and power density.