Journal Article

Efficient H2O2 Synthesis Through a Two‐Electron Oxygen Reduction Reaction by Electrocatalysts

Zhou, Yanhong, Jiang, Haomin, Chen, Runxuan, Chen, Huatian, Lan, Xiyue, Liu, Sha, Cai, Jiajin, Lin, Liu, Chen, Xinyu, Sun, Zemin

2024

Overview

The two‐electron oxygen reduction reaction (2e‐ORR) for the sustainable synthesis of hydrogen peroxide (H2O2) has demonstrated considerable potential for local production of this environmentally friendly chemical oxidant on small, medium, and large scales. This method offers a promising alternative to the energy‐intensive anthraquinone approach, placing a primary emphasis on the development of efficient electrocatalysts. Improving the efficiency of electrocatalysts and uncovering their catalytic mechanisms are essential steps in achieving high 2e‐ORR activity, selectivity, and stability. This comprehensive review summarizes recent advancements in electrocatalysts for in‐situ H2O2 production, providing a detailed overview of the field. In particular, the review delves into the design, fabrication, and investigation of catalytic active sites contributing to H2O2 selectivity. Additionally, it highlights a range of electrocatalysts including pure metals and alloys, transition metal compounds, single‐atom catalysts, and carbon‐based catalysts for the 2e‐ORR pathway. Finally, the review addresses significant challenges and opportunities for efficient H2O2 electrosynthesis, as well as potential future research directions. Electrochemical synthesis of hydrogen peroxide (H2O2) through a two‐electron oxygen reduction reaction (2e‐ORR) has emerged as an appealing process for onsite production of this chemically valuable oxidant. This Review studies the experimental efforts in understanding the challenges in catalysis for electrochemical synthesis of H2O2 as well as providing design principles for more efficient catalyst materials.

• Subject: 2e-ORR pathway / Electrocatalyst design / H2O2 electrosynthesis / H2O2 selectivity / Oxygen reduction reaction