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Boosting electrochemical oxygen reduction to hydrogen peroxide coupled with organic oxidation
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Journal Article
Boosting electrochemical oxygen reduction to hydrogen peroxide coupled with organic oxidation
2024
Overview
The electrochemical oxygen reduction reaction (ORR) to produce hydrogen peroxide (H
2
O
2
) 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 H
2
O
2
yield rates of 0.73 mol g
cat
−1
h
−1
in the H-cell and 5.48 mol g
cat
−1
h
−1
in the flow cell, outperforming most reported catalysts. The experimental results show that the Ni atoms selectively adsorb O
2
, while carbon nanosheets generate reactive hydrogen species, synergistically enhancing H
2
O
2
production. Furthermore, a coupling reaction system integrating the 2e
−
ORR with ethylene glycol oxidation significantly enhances H
2
O
2
yield rate to 7.30 mol g
cat
−1
h
−1
while producing valuable glycolic acid. Moreover, we convert alkaline electrolyte containing H
2
O
2
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 H
2
O
2
production but suffers from poor activity and low yield. In this work, the authors present Ni single atom catalyst for efficient H
2
O
2
production which is further coupled with organic oxidation reaction to enhance the economic feasibility of the system.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
