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- Title
Boosting electrochemical oxygen reduction to hydrogen peroxide coupled with organic oxidation.
- Authors
Sun, Yining; Fan, Kui; Li, Jinze; Wang, Lei; Yang, Yusen; Li, Zhenhua; Shao, Mingfei; Duan, Xue
- Abstract
The electrochemical oxygen reduction reaction (ORR) to produce hydrogen peroxide (H2O2) is appealing due to its sustainability. However, its efficiency is compromised by the competing 4e− ORR pathway. In this work, we report a hierarchical carbon nanosheet array electrode with a single-atom Ni catalyst synthesized using organic molecule-intercalated layered double hydroxides as precursors. The electrode exhibits excellent 2e− ORR performance under alkaline conditions and achieves H2O2 yield rates of 0.73 mol gcat−1 h−1 in the H-cell and 5.48 mol gcat−1 h−1 in the flow cell, outperforming most reported catalysts. The experimental results show that the Ni atoms selectively adsorb O2, while carbon nanosheets generate reactive hydrogen species, synergistically enhancing H2O2 production. Furthermore, a coupling reaction system integrating the 2e− ORR with ethylene glycol oxidation significantly enhances H2O2 yield rate to 7.30 mol gcat−1 h−1 while producing valuable glycolic acid. Moreover, we convert alkaline electrolyte containing H2O2 directly into the downstream product sodium perborate to reduce the separation cost further. Techno-economic analysis validates the economic viability of this system. Electrochemical oxygen reduction is a promising method for H2O2 production but suffers from poor activity and low yield. In this work, the authors present Ni single atom catalyst for efficient H2O2 production which is further coupled with organic oxidation reaction to enhance the economic feasibility of the system.
- Subjects
ELECTROLYTIC reduction; HYDROGEN peroxide; COUPLING reactions (Chemistry); OXYGEN reduction; OXIDATION; LAYERED double hydroxides
- Publication
Nature Communications, 2024, Vol 14, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-024-50446-2