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Lee, Hyun-Wook
Energy Storage and Electron Microscopy Laboratory
Research Interests
  • Energy storage, secondary batteries, transmission electron microscopy, real time analysis

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

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Title
Interface Engineering of Hematite with Nacre-like Catalytic Multilayers for Solar Water Oxidation
Author
Choi, YeongkyuJeon, DasomChoi, YuriKim, DongseokKim, NayeongGu, MinsuBae, SanghyunLee, TaeminLee, Hyun-WookKim, Byeong-SuRyu, Jungki
Issue Date
2019-01
Publisher
AMER CHEMICAL SOC
Citation
ACS NANO, v.13, no.1, pp.467 - 475
Abstract
An efficient water oxidation photoanode based on hematite has been designed and fabricated by tailored assembly of graphene oxide (GO) nanosheets and cobalt polyoxometalates (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 (~ 369 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.
URI
https://scholarworks.unist.ac.kr/handle/201301/25427
URL
https://pubs.acs.org/doi/10.1021/acsnano.8b06848
DOI
10.1021/acsnano.8b06848
ISSN
1936-0851
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