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RISS 인기검색어
- 검색키워드
- 주제어 : Photoanode modification (검색결과 3 건)
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Jeon, Tae Hwa,Bokare, Alok D.,Han, Dong Suk,Abdel-Wahab, Ahmed,Park, Hyunwoong,Choi, Wonyong Elsevier 2017 Applied catalysis. B, Environmental Vol.201 No.-
<P><B>Abstract</B></P> <P>Porous hematite (α-Fe<SUB>2</SUB>O<SUB>3</SUB>) films doped with Sn(IV) and coated with an ultrathin (∼2nm thick) Nb<SUB>2</SUB>O<SUB>5</SUB> passivation layer were synthesized, and the photoelectrochemical (PEC) water oxidation performance and durability of the hematite were examined in detail. As compared to hematite samples modified by either doping or passivation, dual-modified hematite exhibited a promising PEC water oxidation performance under AM 1.5 irradiation. A stable photocurrent was maintained under prolonged irradiation over 24h, while O<SUB>2</SUB> was produced from water with a Faradaic efficiency of over 80% without showing any sign of deactivation. This performance and durability could be decoupled into separate effects of Sn doping and Nb<SUB>2</SUB>O<SUB>5</SUB> layer via in-depth surface characterization and electrochemical analyses. Sn doping increased the donor density (<I>N</I> <SUB>d</SUB>) of bare hematite by a factor of 20 and significantly improved its conductivity, leading to enhanced charge transfer efficiency. The Nb<SUB>2</SUB>O<SUB>5</SUB> layer exerted an effect similar to Sn doping because of the diffusion of a fraction of Nb(V) into the hematite lattice during the annealing process at 700°C. The primary effect of the Nb<SUB>2</SUB>O<SUB>5</SUB> layer is to passivate the hematite surface and make the surface more reactive toward the oxygen evolution through water oxidation. These effects are synergistically combined in the dual-modified hematite electrode.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Hematite doped with Sn(IV) and coated with an ultrathin Nb<SUB>2</SUB>O<SUB>5</SUB> layer are synthesized. </LI> <LI> Dual-modified hematite exhibits remarkably high photoelectrochemical efficiencies. </LI> <LI> A stable photocurrent is maintained under prolonged irradiation over 24h. </LI> <LI> O<SUB>2</SUB> is linearly produced from water with an efficiency of >80% without deactivation. </LI> <LI> The effect is in-depth studied in terms of charge separation and injection. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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김선지,오지은,이상주,한윤수 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
This work reports on the preparation of surface-modified TiO<sub>2</sub> photoanodes by dip coating process and effects on the performance of dyesensitized solar cells(DSSCs). Nanoporous TiO<sub>2</sub> photoanodes were immersed into an aqueous 1,2-ethane disulfonic acid disodium salt (ED2S) solution, and the resulting phtoanodes were applied to DSSCs. DSSC with ED2S-modified photoanode showed an enhancement in open circuit voltage and short circuit current, resulting in a power conversion efficiency (PCE) of 7.37% compared to that (7.08%) of reference device with bare TiO<sub>2</sub>.
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안효진,김선지,남혜정,조성일,심준형,양기정,한윤수 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
A nanoporous TiO2 film was modified with an aqueous sodium ethane sulfonate(C2H5SO3Na), and the resulting film was applied to the photoelectrode of dye-sensitized solar cell (DSSC). The DSSC with C2H5SO3Namodified photoelctrode showed an increase in short circuit current (Jsc) and open circuit voltage (Voc), resulting in a power conversion efficiency (PCE) of 10.25%, compared to that (9.89%) of reference device with bare TiO2. The suppression of charge recombination between photo-injected electrons and triiodide (I3 -) ions was found to increase both Jsc and Voc of the device with C2H5SO3Na-modified photoelctrode.
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