Accelerating water dissociation to achieve ampere-level hydrogen peroxide electrosynthesis in brine and seawater.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 40593612.
- Also identified by DOI 10.1038/s41467-025-60950-8 and PMC identifier 12214788.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
Ampere-level hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) electrosynthesis in brine and seawater via two-electron oxygen reduction reaction (2e<sup>-</sup> ORR) is promising, but limited by the slow water dissociation and insufficient protons in neutral media. Hence, we design a multifunctional Ni(OH)<sub>2</sub> nanoplates anchored on carbon nanotubes (CNTs) as 2e<sup>-</sup> ORR catalyst towards H<sub>2</sub>O<sub>2</sub> electrosynthesis, where Ni(OH)<sub>2</sub> nanoplates accelerate water dissociation and proton transfer, resolving the critical proton shortage for H<sub>2</sub>O<sub>2</sub> formation. Combined with exceptional chloride tolerance and suppressed hydrogen evolution, the catalyst achieves a high H<sub>2</sub>O<sub>2</sub> yield of 141 mol g<sup>-1</sup> h<sup>-1</sup> (14.1 mmol cm<sup>-2</sup> h<sup>-1</sup>) at 1 A cm<sup>-2</sup> and a long operation time over 150 h at 200 mA cm<sup>-2</sup> in 1 M NaCl solution with >80% H<sub>2</sub>O<sub>2</sub> selectivity. In natural seawater, it achieves a Faraday efficiency over 70% at 100 mA cm<sup>-2</sup>. This work enables water purification/disinfection via simultaneous H<sub>2</sub>O<sub>2</sub>/active chlorine production, bridging electrosynthesis with environmental remediation.