Interface Engineering of Hematite with Nacre-like Catalytic Multilayers for Solar Water Oxidation

Yeongkyu Choi, Dasom Jeon, Yuri Choi, Dongseok Kim, Nayeong Kim, Minsu Gu, Sanghyun Bae, Taemin Lee, Hyun Wook Lee, Byeong Su Kim, Jungki Ryu

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12 Citations (Scopus)

Abstract

An efficient water oxidation photoanode based on hematite has been designed and fabricated by tailored assembly of graphene oxide (GO) nanosheets and cobalt polyoxometalate (Co-POM) water oxidation catalysts into a nacre-like multilayer architecture on a hematite photoanode. The deposition of catalytic multilayers provides a high photocatalytic efficiency and photoelectrochemical stability to underlying hematite photoanodes. Compared to the bare counterpart, the catalytic multilayer electrode exhibits a significantly higher photocurrent density and large cathodic shift in onset potential (a369 mV) even at neutral pH conditions due to the improved charge transport and catalytic efficiency from the rational and precise assembly of GO and Co-POM. Unexpectedly, the polymeric base layer deposited prior to the catalytic multilayers improves the performance even more by facilitating the transfer of photogenerated holes for water oxidation through modification of the flat band potential of the underlying photoelectrode. This approach utilizing polymeric base and catalytic multilayers provides an insight into the design of highly efficient photoelectrodes and devices for artificial photosynthesis.

Original languageEnglish
Pages (from-to)467-475
Number of pages9
JournalACS Nano
Volume13
Issue number1
DOIs
Publication statusPublished - 2019 Jan 22

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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    Choi, Y., Jeon, D., Choi, Y., Kim, D., Kim, N., Gu, M., Bae, S., Lee, T., Lee, H. W., Kim, B. S., & Ryu, J. (2019). Interface Engineering of Hematite with Nacre-like Catalytic Multilayers for Solar Water Oxidation. ACS Nano, 13(1), 467-475. https://doi.org/10.1021/acsnano.8b06848