Highly effective electrosynthesis of hydrogen peroxide from oxygen on a redox-active cationic covalent triazine network

Abstract

Direct electrosynthesis of hydrogen peroxide (H2O2) by oxygen reduction is a green and safe strategy to replace the traditional anthraquinone process. Herein, we have designed a two-dimensional redox-active cationic covalent triazine network to be used directly as a cost-effective metal-free electrocatalyst for the oxygen reduction reaction (ORR) to form H2O2. Such a dicationic 2D polymer possesses a porous structure with pore diameters of 2-10 nm and a total N content of 13.3 wt%. The electron paramagnetic resonance experiment confirms the reduction of a viologen-based polymer to radical cations and the subsequent generation of superoxygen radicals. The radical characteristics and high N content within this polymer are the essential for the efficient ORR via a two-electron pathway. As a result, the present electrocatalyst exhibits a high ORR activity and excellent H2O2 selectivity (∼85%), thus providing a feasible possibility of designing highly selective metal-free electrocatalysts for electrocatalytic production of H2O2 from O2.

Realization of Oxygen Reduction and Evolution Electrocatalysis by In Situ Stabilization of Co Nanoparticles in a Redox‐Active Donor‐Acceptor Porous Organic Polymer

“…First, we have recorded cyclic voltammogram (CV) of TAPA in acetonitrile with respect to (wrt) Ag/AgNO 3 . Interestingly, the presence of two redox peaks at 0.82/0.56 and 0.23/‐0.07 V wrt Ag/AgNO 3 in CV of TAPA demonstrate in situ formation of bication species (Figure S4) . Further, CV of TAPA‐PG was recorded under similar condition as used for TAPA (Figure S5&6).…”

A new insight into the stability of nanofiber electrodes used in proton exchange membrane fuel cells

“…However, most previous studies were aimed at improving the performance and lowering Pt loading, while the stability was characterized by cyclic voltammetry aging (CV aging) tests. Nevertheless, during the fuel cell operations, both the cross-over of reactant gases and the two-electron pathway of oxygen reduction reaction (ORR) would result in the formation of H 2 O 2 [9] . Subsequently, the decomposition of H 2 O 2 will release reactive oxygen species (ROS) such as HO • or HOO • [9,10] .…”

“…Nevertheless, during the fuel cell operations, both the cross-over of reactant gases and the two-electron pathway of oxygen reduction reaction (ORR) would result in the formation of H 2 O 2 [9] . Subsequently, the decomposition of H 2 O 2 will release reactive oxygen species (ROS) such as HO • or HOO • [9,10] . To facilitate the shape of the nanofiber structure, an inert carrier polymer that is vulnerable to radicals must be added into the catalyst ink.…”

Electrocatalytic Synthesis of Hydrogen Peroxide over Au/TiO2 and Electrochemical Trace of OOH* Intermediate

“…To date, a series of excellent catalysts with potential value in application are prepared, which are classified in the following categories: (1) noble metal-based catalysts such as Au and Pd and their alloys, [9] (2) novel carbon materials such as heteroatom-doped carbon nanotubes and graphene, [10] (3) transition metal oxide, [11] and (4) single-atom noble metal catalysts etc. [12] Among them, the catalysts based on Au catalysts exhibit excellent electrocatalytic activities and stability. Effective use of Au by maximizing its catalytic performance is a practical method to counteract the high cost.…”