Selective Electrochemical Production of Hydrogen Peroxide from Reduction of Oxygen on Mesoporous Nitrogen Containing Carbon

Abstract

Heteroatom doped carbon materials with mesopores are active catalysts to bring about oxygen reduction reaction in alkaline media. Here, we aim to see the sights of mesoporous-nitrogen containing carbon (MNC) prepared at three different temperatures towards selective hydrogen peroxide (H 2 O 2 ) production during oxygen reduction reaction in neutral media. A high H 2 O 2 selectivity of 85 % at 0.7 V vs. RHE is apparent with a large H 2 O 2 production rate of 9600 μmol g catalyst À 1 h À 1 and faradaic efficiency of 88.7 % for MNC-600 in 0.1 M KHCO 3 solution. The effect of electrolyte towards selectivity is also premeditated. In the end, to visualize the local H 2 O 2 production sequential chronoamperometry in SG-TC mode was performed using Pt-microelectrode at applied substrate potentials.

Single-iron, cobalt, nickel, and copper-atom catalysts for the selective reduction of oxygen to H2O2

“…2f ), while the electron transfer number follows the opposite trend. Among the samples, the Cu/NCNSs catalyst is the most favorable catalyst for the 2e − ORR pathway in neutral media with a ring current density of 0.89 mA cm −2 , a positive onset potential of 0.77 V, and an H 2 O 2 selectivity of 76%, which outperformed most of the ORR electrocatalysts reported in the literature 30,39,44,[48][49][50][51] (Table S5 †).…”

Review on the Degradation Mechanisms of Metal-N-C Catalysts for the Oxygen Reduction Reaction in Acid Electrolyte: Current Understanding and Mitigation Approaches

“…While Metal-free N-C materials are generally highly selective for the two-electron ORR, − they display also a high overpotential, which has a negative impact on the energy efficiency of an electrochemical device whose purpose is H 2 O 2 electrosynthesis. The overpotential for Metal-free N-C materials is especially high in mild to strong acid electrolytes, and those pH values are preferable for the chemical stability of hydrogen peroxide.…”

Ultrahigh oxygen-doped carbon quantum dots for highly efficient H2O2 production via two-electron electrochemical oxygen reduction

“…10,[15][16][17][18] Apart from the earthabundant reserves and decent chemical stability, a major advantage of carbon-based materials is that their electronic configurations and coordination environments can be tuned by heteroatom dopants (such as O, N, S, B, and P) in pursuit of high selectivity and activity for the 2eORR. 7,[18][19][20][21][22][23][24][25][26][27][28] In particular, the oxygen heteroatoms are significantly efficient for promoting the catalytic 2eORR pathways, although the active sites induced by O dopants remain elusive due to the diversity of the O-containing functional groups in the carbon materials. [29][30][31][32] Epoxy, ether (C-O-C), hydroxyl (-OH), and carboxyl (O-CQO) groups have all been proposed as the active sites for the 2eORR in prior studies.…”