Hexafluorophosphate additive enables durable seawater oxidation at ampere-level current density
University of Electronic Science and Technology of China · Sichuan University · +3 more institutions
Abstract
Abstract Direct seawater electrolysis at ampere-level current densities, powered by coastal/offshore renewables, is an attractive avenue for sustainable hydrogen production but is undermined by chloride-induced anode degradation. Here we demonstrate the use of hexafluorophosphate (PF₆⁻) as an electrolyte additive to overcome this limitation, achieving prolonged operation for over 5,000 hours at 1 A cm −2 and 2300 hours at 2 A cm −2 using NiFe layered double hydroxide (LDH) as anode. Together with the experimental findings, PF₆⁻ can intercalate into LDH interlayers and adsorb onto the electrode surface under an applied electric field, blocking Cl⁻ and stabilizing Fe to prevent segregation. The…
Citation impact
- FWCI
- 22.08
- Percentile
- 100%
- References
- 66
Authors
13- XHXun HeCorresponding
University of Electronic Science and Technology of China, Sichuan University, Shandong Normal University, West China Hospital of Sichuan University
- YYYongchao Yao
Sichuan University, West China Hospital of Sichuan University
- LZLimei Zhang
University of Electronic Science and Technology of China, Sichuan University, West China Hospital of Sichuan University
- HWHefeng Wang
Shandong Normal University
- HTHong Tang
University of Electronic Science and Technology of China
Topics & keywords
- Electrolyte
- Anode
- Electrolysis
- Seawater
- Oxygen evolution
- Chloride
- Materials science
- Chemical engineering