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( Mahadik Mahadeo Abasaheb ),( Pravin S Shinde ),( Min Cho ),( Jum Suk Jang ) 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
We designed metal oxide-coated ZnIn2S4/TiO2 (ZT) heterostructure photoanodes for enhanced photoelectrochemical performance, via hydrothermal and dip-coating methods. The effects of thin metal oxide coating layers such as , TiO2, Al2O3, and SiO2, on the structural, morphological, optical, and photoelectrocatalytic activity of ZT photoanodes were investigated in detail. The metal oxide coating layers significantly enhanced the photoelectrochemical performance of ZT in the order: SiO2/ZT > Al2O3/ZT >, TiO2 /ZT > ZT, at pH 11.5 under simulated one sun illumination. A two-fold boost in the photocurrent density of ZT was recorded after a surface coating of a thin SiO2 layer among the studied metal oxide layers. The charge transfer resistance measured from the electrochemical impedance spectroscopy (EIS) analysis was less for the SiO2/ZT photoanode, indicating enhanced charge separation between the oxide surface layer and electrolyte. The enhanced photoelectrochemical performance due to the thin SiO2 coating was attributed to the improved interface properties that led to the effective charge transfer processes in the vicinity of the electrolyte.
( Mahadik Mahadeo Abasaheb ),( Arunprabaharan Subramanian ),류정호,조민,장점석 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
Well-defined CdS nanograins sensitized Zr:Fe<sub>2</sub>O<sub>3</sub> nanorods with enhanced photoelectrocatalytic performance are synthesized on F-doped SnO<sub>2</sub>(FTO) using hydrothermal method. Owing predominantly to the appropriate band positions and charge collection in Zr:Fe<sub>2</sub>O<sub>3</sub> nanorods, CdS/Zr:Fe<sub>2</sub>O<sub>3</sub> heterostructure exhibit 1.7 times improved photocurrent density compared to Zr:Fe<sub>2</sub>O<sub>3</sub>. Unfortunately, CdS nanograins sensitized Zr:Fe<sub>2</sub>O<sub>3</sub> nanorod arrays suffers from instability problem. Furthermore, Ni(OH)<sub>2</sub> loading can boost the PEC performance of heterojunction and also acts as a protective layer that improves the stability of the Ni(OH)<sub>2</sub>/CdS/Zr:Fe<sub>2</sub>O<sub>3</sub> electrode. Such enhanced PEC activity may be ascribed to the effective charge separation between CdS and Zr:Fe<sub>2</sub>O<sub>3</sub> nanorods as well as increases the lifetime of holes due to Ni(OH)<sub>2</sub>. <sup>**</sup>This work was supported by the BK21 plus program through the National Research Foundation (NRF).
( Mahadik Mahadeo Abasaheb ),( Pravin S. Shinde ),이현휘,조민,장점석 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
A simple and effective strategy was used to fundamentally improve the performance of a heterostructuredNi(OH)2/CdS/ZnIn2S4/TiO2 photoanode. TiO2 nanorods grown hydrothermally on fluorine-doped tin oxide (FTO) were annealed at 500°C. The annealing effect minimized the defects in TiO2 grain boundaries and also aids to enhance the interface between the FTO and TiO2 nanorods for efficient electron transport. The stepwise introduction of ZnIn2S4 and CdS on annealed TiO2 improved both the absorption in the visible spectrum range and electron/hole separation in CdS/ZnIn2S4/TiO2. Additionally, the Ni(OH)2 co-catalyst can acts as effective hole trapping sites and improved the stability of the photoelectrode through the timely consumption of the photogenerated charges, particularly the holes.
( Love Kumar Dhandole ),( Mahadik Mahadeo Abasaheb ),김수경,조민,류정호,장점석 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
Transition metal oxides loaded acid treated TiO<sub>2</sub> nanorods (NRs) were successfully prepared by chemical treatment and wet impregnation methods. The catalysts were characterized by XRD, TEM, XPS, FT-IR and UV-DRS. The photocatalytic activities of as-prepared, acid treated, metal oxide loaded and metal oxide loaded acid treated NRs were compared and dye degradation efficiency were determined from kinetics of the degradation of Orange (II) dye. Cobalt oxide 1w% loaded on 1.0 M acid treated TiO<sub>2</sub> NRs exhibited the higher photocatalytic Orange (II) degradation efficiency 98.57% (within 120 min) than as-prepared and metal oxide loaded samples. The synergistic effect of cobalt oxide on acid treated TiO<sub>2</sub> NRs over dye degradation is considered as fine dispersion of metal oxides on the OH rich surface of TiO<sub>2</sub>. The mechanism of enhanced photocatalytic activity and photoelectrochemical analysis of photocatalyst also studied. <sup>**</sup>This work was supported by the BK21 plus program.
황준범,김사랑,채원식,Habib Mohiddin Pathan,Mahadeo Abasaheb Mahadik,장점석 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.6
A strategy involving CoOx catalyst adsorption and acid treatment for modifying the surface properties of Zr-doped hematite nanocoral (NC) photoanodes has been proposed. Acid-treated Zr-Fe2O3 NCs exhibited a reduced electrode/electrolyte interface resistance and improved surface charge-injection efficiency. X-ray photoelectron spectroscopy data confirmed an increased number of hydroxy groups and the formation of Fe2+ sites on the surface of the acidtreated Zr-Fe2O3 NC, suggesting surface amendment. Furthermore, after surface amendment with a 1mM Co(OAc)2 solution, the CoOx encapsulated acid-treated Zr-Fe2O3 NC photoanode exhibited a photocurrent density of 1.83mA/ cm2 at 1.23 V vs. RHE, following a 200-mV cathodic shift in the photocurrent onset compared with the bare Zr-Fe2O3 NC. The experimental results indicated the efficacy of acid treatment and CoOx adsorption for reducing the surface state and enhancing the photoelectrochemical water-oxidation performance. The acid-treatment step in the CoOxencapsulated acid-treated Zr-Fe2O3 NC provided a CoOx catalyst adsorption bond and permitted the kinetics of the charge-transfer process. This synergistic strategy of acid treatment and CoOx adsorption for enhancing the PEC performance provides a reference for accelerating the charge separation for other photoelectrodes.