Electrocatalyst Derived from Abundant Biomass and its Excellent Activity for In Situ H2O2 Production

Abstract Hydrogen peroxide (H 2 O 2 ) is considered an essential chemical and is widely used in many fields. The in situ electrochemical production of H 2 O 2 using oxygen reduction has become promising in H 2 O 2 applications because it can reduce the danger and costs of the storage and transportation of H 2 O 2 . Developing high‐performance and metal‐free electrocatalysts with cheap and commercially available source materials for in situ H 2 O 2 production remains challenging. Here, the N, O‐co‐doped microporous carbons derived from abundant biomass (bean dregs) were prepared by a simple hydrothermal treatment and annealing process. Electrochemical measurement results showed a high selectivity (up to 98 %) of the typical product in 0.1 M KOH, a satisfactory disk current density and a high productivity of H 2 O 2 (380 mg L −1 h −1 ) with an excellent faradaic efficiency (up to 97.0 %), which were achieved through RRDE technology and flow cell. Additionally, the system equipped with a (GDE, containing N‐O‐MC‐750) as the cathode exhibited high performance in removing formaldehyde, and it may have potential application in the treatment of wastewater containing formaldehyde. This method can avoid the danger and costs of the storage and transportation of H 2 O 2 . This work is helpful for developing a high‐performance electrocatalyst for the production of H 2 O 2 , and for its practical application.