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Jeon, Dasom,Kim, Hyunwoo,Lee, Cheolmin,Han, Yujin,Gu, Minsu,Kim, Byeong-Su,Ryu, Jungki American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.46
<P>Artificial photosynthesis is considered one of the most promising solutions to modem energy and environmental crises. Considering that it is enabled by multiple components through a series of photoelectrochemical processes, the key to successful development of a photosynthetic device depends not only on the development of novel individual components but also on the rational design of an integrated photosynthetic device assembled from them. However, most studies have been dedicated to the development of individual components due to the lack of a general and simple method for the construction of the integrated device. In the present study, we report a versatile and simple method to prepare an efficient and stable photoelectrochemical device via controlled assembly and integration of functional components on the nanoscale using the layer by -layer (LbL) assembly technique. As a proof of concept, we could successfully build a photoanode for solar water oxidation by depositing a thin film of diverse cationic polyelectrolytes and anionic polyoxometalate (molecular metal oxide) water oxidation catalysts on the surface of various photoelectrode materials (e.g., Fe2O3, BiVO4, and TiO2). It was found that the performance of photoanodes was significantly improved after the deposition in terms of stability as well as photocatalytic properties, regardless of types of photoelectrodes and polyelectrolytes employed. Considering the simplicity and versatile nature of LbL assembly techniques, our approach can contribute to the realization of artificial photosynthesis by enabling the design of novel photosynthetic devices.</P>
Interface Engineering of Hematite with Nacre-like Catalytic Multilayers for Solar Water Oxidation
Choi, Yeongkyu,Jeon, Dasom,Choi, Yuri,Kim, Dongseok,Kim, Nayeong,Gu, Minsu,Bae, Sanghyun,Lee, Taemin,Lee, Hyun-Wook,Kim, Byeong-Su,Ryu, Jungki American Chemical Society 2019 ACS NANO Vol.13 No.1
<P>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 (∼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.</P> [FIG OMISSION]</BR>