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1 results

  • Preparation of layered double hydroxide films using an electrodeposition and subsequent crystal growth method

  • Noriyuki Sonoyama, Shizuka Yamada, Tomoki Ota, Haruna Inagaki, Patrick K. Dedetemo, Satoshi Yoshida
  • Journal:
    Clay Minerals / Volume 56 / Issue 4 / December 2021
    Published online by Cambridge University Press:
    23 February 2022, pp. 284-291

  • The surface coating of a gas reaction electrode with layered double hydroxides (LDHs) featuring various electrode catalyst activities was prepared via electrodeposition and the subsequent crystal growth of LDHs. LDH formation was confirmed by X-ray diffraction and Raman scattering measurements after subsequent crystal growth on respective electrodeposited precursor films in Ni-Fe and Zn-Al LDH systems. However, the crystal growth of LDHs in Ni-Mn and Cu-Mn systems was observed on the Mg-Al LDH-electrodeposited films. LDH films were also deposited on the surface of a carbon paper electrode with a rugged surface via electrodeposition and subsequent crystal growth. Using the prepared LDH-coated carbon paper electrodes, the electrode catalytic activity for the oxygen reduction reaction (ORR) was examined. For Ni-Mn, Ni-Al and Ni-Fe LDH-coated carbon paper electrodes, the threshold voltages of the ORR decreased. Hence, the LDHs electrodeposited on a gas reaction electrode have high electrochemical catalytic activity for the ORR.