Effect of visible light and electrode wetting on the capacitive performance of S- and N-doped nanoporous carbons: Importance of surface chemistry

Abstract

Importance of surface chemistry. Carbon, 78, Additional Information:• This paper was accepted for publication in the journal Car- AbstractNanoporous carbons with graphitic domains were synthesized from a polymer containing sulfur and nitrogen. The materials were characterized using adsorption of nitrogen, potentiometric titration TA/MS, XPS, TEM and XRD. Then they were tested as supercapacitors in threeelectrode cell and under visible light irradiation after extensive wetting either in water or a sulfuric acid electrolyte. The capacitance up to 450 F/g was measured in spite of a relatively low surface (<850 m 2 /g). The surface chemistry, and especially sulfur and nitrogen containing functional groups, were found of paramount importance for the capacitive behavior and for the effective pore space utilization by the electrolyte ions. Photocurrent measured in light also affects the capacitance. Its generation is linked to the excitation of sulfonic/sulfoxide chromophores-like moieties decorating the surface of the polymer-derived carbons.3

Hierarchical S-doped porous carbon derived from by-product lignin for high-performance supercapacitors

“…4a), -700 (Fig. S4a †), and -800 ( 47, 48 The appearance of the p-p* shakeup satellite shows carbonization and aromatization features, which suggest good electrical conductivity of the materials.…”

Toxic gas sensing on nanoporous carbons

“…To the best of our knowledge even though many studies have reported the usage of S-and N-co-doped carbonbased materials in various electrochemical applications such as supercapacitors, oxygen reduction, or water splitting (Liang et al 2012;Seredych et al 2014;Tsubota et al 2011), our research group is the irst one to address their application as gas, and speciically ammonia gas sensors (Travlou et al 2016b). To examine the ammonia sensing capability of S-and N-dual-doped nanoporous carbons, we prepared two carbon samples referred to as C-AO and C-BO (Travlou et al 2016b).…”

“…c Dependence of ΔR/R o of the oxidized samples on the NH 3 concentrations. Copyright 2016, Elsevier (Travlou et al 2016b) Table 1 The parameters of porous structure calculated from nitrogen adsorption isotherms a Data taken from Reference (Seredych et al 2014). Copyright 2014, Elsevier (Seredych et al 2014) Sample S BET (m 2 /g) S NLDFT (m 2 /g) V t (cm 3 /g) V meso (cm 3 /g) V mic (cm 3 /g) V <0.7nm (cm 3 /g) V <1nm (cm 3 /g) V mic /V t …”

“…The surface area data for C-AO and C-BO is taken from Ref. (Seredych et al 2014) and the data on CS from Ref. ).…”

“…The details on these carbons preparation are described elsewhere (Seredych et al 2014;Travlou et al 2016b). …”