Corrosion and Alloy Engineering in Rational Design of High Current Density Electrodes for Efficient Water Splitting

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  • Vasanth Rajendiran Jothi
    Department of Chemical Engineering Hanyang University 222 Wangsimni‐ro, Seongdong‐gu Seoul 04763 Republic of Korea
  • Karuppasamy Karuppasamy
    Division of Electronics and Electrical Engineering Dongguk University‐Seoul Seoul 04620 Republic of Korea
  • Thandavarayan Maiyalagan
    Electrochemical Energy Laboratory Department of Chemistry SRM Institute of Science and Technology Kattankulathur 603203 India
  • Hashikaa Rajan
    Department of Chemical Engineering Hanyang University 222 Wangsimni‐ro, Seongdong‐gu Seoul 04763 Republic of Korea
  • Chi‐Young Jung
    Buan Fuel Cell Center Korea Institute of Energy Research (KIER) Daejeon Jeollabuk‐do 56332 Republic of Korea
  • Sung Chul Yi
    Department of Chemical Engineering Hanyang University 222 Wangsimni‐ro, Seongdong‐gu Seoul 04763 Republic of Korea

書誌事項

公開日
2020-05-05
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/aenm.201904020
公開者
Wiley

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説明

<jats:title>Abstract</jats:title><jats:p>Alongside rare‐earth metals, Ni, Fe, Co, Cu are some of the critical materials that will be in huge demand thanks to growth in clean‐energy sector. Herein scrap stainless steel wires (SSW) from worn‐out tires are employed as a support material for catalyst integration in the hydrogen evolution reaction (HER). In addition, SSW by corrosion engineering is exercised as an in situ formed freestanding robust electrode for the oxygen evolution reaction (OER). By superficial corrosion of SSW, inherent active species are unmasked in the form of Ni/FeOOH nanocrystallites displaying efficient water oxidation by reaching 500 mA cm<jats:sup>−2</jats:sup> at low overpotential (η<jats:sub>500</jats:sub>) of 287 mV in 1 <jats:sc>m</jats:sc> KOH. Similarly, cathode scrap SSW with active (alloy) coatings of MoNi<jats:sub>4</jats:sub> catalyzes the HER at η<jats:sub>‐200</jats:sub> = 77 mV, with a low activation energy (<jats:italic>E</jats:italic><jats:sub>a</jats:sub> = 16.338 kJ mol<jats:sup>−1</jats:sup>) and high durability of 150 h. Promisingly, when used in industrial conditions, 5 <jats:sc>m</jats:sc> KOH, 343 K, these electrodes demonstrate abnormal activity by yielding high anodic and cathodic current density of 1000 mA cm<jats:sup>−2</jats:sup> at η = 233 mV and η = 161 mV, respectively. This work may inspire researchers to explore and reutilize high‐demand metals from scrap for addressing critical material shortfalls in clean‐energy technologies.</jats:p>

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