Nitrogen and sulfur doped mesoporous carbon as metal-free electrocatalysts for the in situ production of hydrogen peroxide

Chemical and Electrochemical Stability of Nitrogen and Sulphur Doped Mesoporous Carbons

“…The capacitive currents (background current) result almost unchanged before and after ADT, indicating a substantial invariance of the electrochemical active area, that it is not strictly superimposable with the geometric or effective surface area. As observed by many authors in literature, the increased peak current suggests a higher degree of surface carbon oxidation with time [26,33,34,51], and the restrained oxidation observed for the doped MCs with respect to the undoped MC, may confirm, that the presence of N and partly S atoms prevents a further oxidation of carbon [22]. In the case od N doped MC, the increased peak current can be also the result of the reversible reduction of nitro groups generated by the oxidation of nitrogen functional groups [52].…”

“…The synthesis and characterization of doped MCs is exhaustively reported in a previous paper [22]. Briefly, the preparative procedure consists in the dissolution of 1 g of silica and 1 g of organic precursor in 15 mL of acetone or ethanol depending on the precursor solubility in the medium.…”

“…Table 1 also reports the nitrogen and sulfur contents expressed in weight percentage determined by elemental analysis [22]. Fig.…”

“…MCs doped with nitrogen or sulfur heteroatoms have shown to catalyze the oxygen reduction reaction (ORR) [17][18][19][20] so that, they are promoted as metal-free and cost-effective electrocatalysts. Furthermore, it was found, that depending on the type of functional groups [21], doped carbon materials can be selective towards the 2e À pathway leading to H 2 O 2 [22] or the 4e À pathway, leading directly to H 2 O [23].…”

Biocharring of natural fibers of insect and plant origin: a green route for the production of ‘carbon-based charge storage nanomaterials’

“…6i-l, peaks around 397 and 399.9 eV correspond to nitride bond and nitrogen bond in an organic matrix, respectively, a peak around 398 eV is seen in RGO obtained from Tassar cocoon corresponds to cyanide bond [9]. In earlier works with carbon materials, similar XPS spectra have been observed [26][27][28].…”