Journal of Energy Chemistry ›› 2023, Vol. 81 ›› Issue (6): 82-92.DOI: 10.1016/j.jechem.2023.02.033

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Zn-doped nickel iron (oxy)hydroxide nanocubes passivated by polyanions with high catalytic activity and corrosion resistance for seawater oxidation

So Jung Kima,1, Heechae Choib,c,1, Jeong Ho Ryud,1, Kang Min Kime, Sungwook Mhinf, Arpan Kumar Nayaka, Junghwan Bangg, Minyeong Jeb, Ghulam Alih, Kyung Yoon Chungi, Kyeong-Han Nak,l, Won-Youl Choik,l, Sunghwan Yeom, Jin Uk Janga, HyukSu Hana,*   

  1. aDepartment of Energy Engineering, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Republic of Korea;
    bTheoretical Materials & Chemistry Group, Institute of Inorganic Chemistry, University of Cologne, Greinst. 6, 50939, Cologne, Germany;
    cMaterials Lab, Geobuk-ro 25-50, Incheon 22793, Republic of Korea;
    dDepartment of Materials Science and Engineering, Korea National University of Transportation, 50 Daehak-ro, Chungju, Chungbuk 27469, Republic of Korea;
    eKorea Institute of Industrial Technology, 137-41 Gwahakdanji-ro, Gangneung-si, Gangwon 25440, Republic of Korea;
    fDepartment of Advanced Materials Engineering, Kyonggi University, Suwon 16227, Republic of Korea;
    gKorea Institute of Industrial Technology, 156 Gaetbeol-ro, Yeonsu-gu, Incheon 406-840, Republic of Korea;
    hU.S.-Pakistan Center for Advanced Studies in Energy (USPCASE), National University of Sciences and Technology (NUST), H-12, Islamabad, Pakistan;
    iEnergy Storage Research Center, Korea Institute of Science and Technology, Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul 02792, Republic of Korea;
    jDivision of Energy and Environment Technology, KIST School, Korea University of Science and Technology, Seoul 02792, Republic of Korea;
    kDepartment of Metal and Materials Engineering Gangneung-Wonju National University, 7 Jukheongil, Gangneung, Gangwon 25457, Republic of Korea;
    lSmart Hydrogen Energy Center, Gangneung-Wonju National University, 7 Jukheongil, Gangneung, Gangwon 25457, Republic of Korea;
    mInnovative Fuel Development Division, Korea Atomic Energy Research Institute, Daedeok-daero 989-111, Yuseong-gu, Daejeon 305-353, Republic of Korea
  • Received:2023-01-08 Revised:2023-02-06 Accepted:2023-02-12 Online:2023-06-15 Published:2023-06-13
  • Contact: * E-mail address: hhan@konkuk.ac.kr (H. Han).
  • About author:1 These authors contributed equally to this work.

Abstract: Electrochemical water splitting to produce hydrogen fuel is a promising renewable energy-conversion technique. Large-scale electrolysis of freshwater may deplete water resources and cause water scarcity worldwide. Thus, seawater electrolysis is a potential solution to the future energy and water crisis. In seawater electrolysis, it is critical to develop cost-effective electrocatalysts to split seawater without chloride corrosion. Herein, we present zinc-doped nickel iron (oxy)hydroxide nanocubes passivated by negatively charged polyanions (NFZ-PBA-S) that exhibits outstanding catalytic activity, stability, and selectivity for seawater oxidation. Zn dopants and polyanion-rich passivated surface layers in NFZ-PBA-S could effectively repel chlorine ions and enhance corrosion resistance, enabling its excellent catalytic activity and stability for seawater oxidation.

Key words: Seawater splitting, Oxygen evolution reaction, Electrocatalyst, Layered double hydroxide, Sulfidation