Hydrogen peroxide (H2O2) is considered an essential chemical and is widely used in many fields. The in situ electrochemical production of H2O2 using oxygen reduction has become promising in H2O2 applications because it can reduce the danger and costs of the storage and transportation of H2O2. Developing high‐performance and metal‐free electrocatalysts with cheap and commercially available source materials for in situ H2O2 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 H2O2 (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 H2O2. This work is helpful for developing a high‐performance electrocatalyst for the production of H2O2, and for its practical application.

Developing oxygen reduction reaction (ORR) electrocatalysts, which have non-precious metal or metal-free features, high performance, and stability to enhance the whole price/performance ratio, has become a great challenge in the practical application of fuel cells and zincÀair batteries. Here, we report the bulk preparation of the N, Fe co-doped carbon with high surface area (NFeÀC-HSA). The typical catalyst has a threedimension network structure. The N, Fe co-doped nanoporous carbon material has a very high surface area, with a BrunauerÀEmmettÀTeller surface area of 1776.68 m 2 g À1 , and a total pore volume of 1.58 cm 3 g À1 . NFeÀC-HSA exhibits superior ORR activity to state-of-the-art Pt/C (20 %) catalyst and excellent stability in alkaline media as well as high ORR activity in acidic media. In the practical application of ZnÀair batteries, NFeÀC-HAS also has superior performance to Pt/C (20 %). Owing to the high surface area and co-doping of nitrogen and iron elements, the prepared nanoporous carbon material may have other applications in many fields such as supercapacitors, sewage treatment, sensors, gas uptake, and so on.

The bulk preparation of an N, P and Fe Tri-doped nano-porous carbon sample using recyclable Pueraria powder, which exhibits dual activities.