Corrosion Engineering on Iron Foam toward Efficiently Electrocatalytic Overall Water Splitting Powered by Sustainable Energy

• Published in: Advanced functional materials 2021-04, Vol.31 (17), p.n/a
• Main Authors: Wu, Zexing, Zhao, Ying, Wu, Hengbo, Gao, Yuxiao, Chen, Zhi, Jin, Wei, Wang, Jinsong, Ma, Tianyi, Wang, Lei
• Format: Article
• Language: English
• Subjects: Catalytic activity; Corrosion; Density functional theory; Electric contacts; Electrocatalysts; FeOOH; High temperature; Hydrogen evolution reactions; Hydrogen-based energy; hydrogen/oxygen evolution reaction; Interfacial properties; Iron; Materials science; Metal surfaces; Renewable energy; Ruthenium oxide; Stirling engines; Sustainable development; Water splitting
• ISSN: 1616-301X; 1616-3028
• DOI: 10.1002/adfm.202010437

Exploiting highly effective and low‐cost electrocatalysts for the hydrogen evolution reaction (HER) is a pressing challenge for the development of sustainable hydrogen energy. In this work, a facile and industrially compatible one‐pot corrosion strategy for the rapid synthesis of amorphous RuO2‐decorated FeOOH nanosheets on iron foam (FFNaRu) within 1 h is reported. Corrosion is a common and inevitable phenomenon that occurs on metal surfaces without electricity input, high temperature, and tedious synthetic procedures. The FFNaRu electrode is superhydrophilic and aerophobic, which guarantees intimate contact with the electrolyte and accelerates the instantaneous escape of produced gas bubbles during the electrocatalytic process. Moreover, the strong electronic interactions between RuO2 and FeOOH promote the electrocatalytic process via dramatically improving the electrochemical interfacial properties. Thus, the FFNaRu electrocatalyst presents excellent catalytic activity towards the HER (30 mV at 10 mA cm–2) and overall water‐splitting (230 mV at 10 mA cm–2) in 1 M KOH. The overall water‐splitting could be simply powered by sustainable and intermittent sunlight, wind, and thermal energies motivated Stirling engine. Density functional theory calculations confirm that coupling effects between RuO2 and FeOOH are also responsible for promoting the electrocatalytic HER performance. A corrosive strategy is employed to prepare electrocatalysts with amorphous Ru oxide decorated FeOOH nanosheets on iron foam within 1 h at room temperature. The obtained nanomaterials exhibit excellent electrocatalytic performance for overall water‐splitting which can be powered by solar cell, wind, and thermal energy.