Prof. LU Zhiyi, Prof. CHEN Liang and coworkers at the Ningbo Institute of Materials Technology and Engineering (NIMTE) of Chinese Academy of Sciences (CAS), have developed a novel anti-corrosion anode via chemical fixation of sulfate, achieving stable seawater electrolysis for over 10,000 hours.
The study was published in Advanced Materials.
Hydrogen can be generated through seawater electrolysis from renewable energy sources, which helps preserve freshwater supplies and thus has been considered a cost-effective sustainable energy conversion and storage strategy. However, highly concentrated Cl- in seawater triggers severe anode corrosion, limiting the application and commercialization of on-site seawater electrolysis for hydrogen production.
To address this issue, scientists at NIMTE doped Ba2+ into NiFe-LDH (NF-LDH) catalysts to synthesize NiFeBa-LDH (NFB-LDH) catalysts through a facile one-step hydrothermal method.
The NFB-LDH catalyst chemically fixed free SO42− by atomically dispersed Ba2+ and preferentially absorbed SO42− on the electrode surface. These formed a dense SO42− layer to repel Cl-, thus protecting the anode from corrosion.
The NFB-LDH achieved unprecedented stability for over 10,000 hours at a constant current density of 400 mA cm−2 in both alkaline seawater and alkaline saline electrolytes.
Compared with commercial Ni anodes, NFB-LDH anodes showed superior stability and activity under simulated industrial conditions.
This work may shed light on the commercialization of seawater electrolysis technology and relevant anti-corrosion electrode design.
The study was supported by the National Key Research and Development Project (Grant No. 2023YFB4005100), the Ningbo Yongjiang Talent Introduction Programme (No. 2021A-036-B), the Ningbo S&T Innovation 2025 Major Special Program (No. 2022Z205) and National Natural Science Foundation of China (No. 52201285), etc.
Fig. NFB-LDH anodes show excellent stability in different electrolytes (Image by NIMTE)
Contact
LU Zhiyi
Ningbo Institute of Materials Technology and Engineering
E-mail: luzhiyi@nimte.ac.cn