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dc.contributor.author박태주-
dc.date.accessioned2020-01-15T06:39:53Z-
dc.date.available2020-01-15T06:39:53Z-
dc.date.issued2019-06-
dc.identifier.citationSCIENTIFIC REPORTS, v. 9, Article no. 9132en_US
dc.identifier.issn2045-2322-
dc.identifier.urihttps://www.nature.com/articles/s41598-019-45672-4-
dc.identifier.urihttps://repository.hanyang.ac.kr/handle/20.500.11754/121871-
dc.description.abstractThe use of a photoelectrochemical device is an efficient method of converting solar energy into hydrogen fuel via water splitting reactions. One of the best photoelectrode materials is Si, which absorbs a broad wavelength range of incident light and produces a high photocurrent level (similar to 44 mA.cm(-2)). However, the maximum photovoltage that can be generated in single-junction Si devices (similar to 0.75 V) is much lower than the voltage required for a water splitting reaction (˃ 1.6 V). In addition, the Si surface is electrochemically oxidized or reduced when it comes into direct contact with the aqueous electrolyte. Here, we propose the hybridization of the photoelectrochemical device with a thermoelectric device, where the Seebeck voltage generated by the thermal energy triggers the self-biased water splitting reaction without compromising the photocurrent level at 42 mA cm(-2). In this hybrid device p-Si, where the surface is protected by HfOx/SiOx bilayers, is used as a photocathode. The HfOx exhibits high corrosion resistance and protection ability, thereby ensuring stability. On applying the Seebeck voltage, the tunneling barrier of HfOx is placed at a negligible energy level in the electron transfer from Si to the electrolyte, showing charge transfer kinetics independent of the HfOx thickness. These findings serve as a proof-of-concept of the stable and high-efficiency production of hydrogen fuel by the photoelectrochemical-thermoelectric hybrid devices.en_US
dc.description.sponsorshipThis work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (No. 2017R1A2B3006941), and the International Collaborative Energy Technology R&D Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea (No. 20168520011370).en_US
dc.language.isoen_USen_US
dc.publisherNATURE PUBLISHING GROUPen_US
dc.titleSeebeck-voltage-triggered self-biased photoelectrochemical water splitting using HfOx/SiOx bi-layer protected Si photocathodesen_US
dc.typeArticleen_US
dc.relation.no1-
dc.relation.volume9-
dc.identifier.doi10.1038/s41598-019-45672-4-
dc.relation.page1-8-
dc.relation.journalSCIENTIFIC REPORTS-
dc.contributor.googleauthorJung, J.-Y.-
dc.contributor.googleauthorKim, Woong D-
dc.contributor.googleauthorKim, D.-H.-
dc.contributor.googleauthorPark, Joo T.-
dc.contributor.googleauthorLee, J.-H-
dc.contributor.googleauthorWehrspohn, R.B.-
dc.relation.code2019002548-
dc.sector.campusE-
dc.sector.daehakCOLLEGE OF ENGINEERING SCIENCES[E]-
dc.sector.departmentDEPARTMENT OF MATERIALS SCIENCE AND CHEMICAL ENGINEERING-
dc.identifier.pidtjp-


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