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Kanade, K.G.,Baeg, J.-O.,Kale, B.B.,Mi Lee, S.,Moon, S.J.,Kong, K.j. Pergamon Press ; Elsevier Science Ltd 2007 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY - Vol.32 No.18
Rose-red color Nb<SUB>2</SUB>Zr<SUB>6</SUB>O<SUB>17-x</SUB>N<SUB>x</SUB> oxynitride photocatalyst was synthesized by thermal ammonolysis of Nb<SUB>2</SUB>Zr<SUB>6</SUB>O<SUB>17</SUB> at 1073K. TEM image of Nb<SUB>2</SUB>Zr<SUB>6</SUB>O<SUB>17-x</SUB>N<SUB>x</SUB> sample showed prismatic pseudo orthorhombic shaped particles with clear edges and an average particle size in the range of 80-90nm. The photocatalytic activities of the oxynitride samples were studied for hydrogen production by H<SUB>2</SUB>S splitting under visible light irradiation. The oxynitride Nb<SUB>2</SUB>Zr<SUB>6</SUB>O<SUB>17-x</SUB>N<SUB>x</SUB> gave the quantum yield of 13.5% in the production of hydrogen from decomposition of hydrogen sulfide under visible light irradiation.
Kanade, K.G.,Baeg, J.O.,Kong, K.j.,Kale, B.B.,Lee, S.M.,Moon, S.J.,Lee, C.W.,Yoon, S. Pergamon Press ; Elsevier Science Ltd 2008 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY - Vol.33 No.23
We report here the novel approach to synthesis of layer perovskite photocatalysts, Pb<SUB>2</SUB>Ga<SUB>2</SUB>Nb<SUB>2</SUB>O<SUB>10</SUB> and RbPb<SUB>2</SUB>Nb<SUB>2</SUB>O<SUB>7</SUB> using solid state route (SSR) and molten salt synthesis (MSS) method. The reported modified MSS method has advantage over conventional SSR method for uniform particle size, well-defined crystal structure, controlled morphology and stoichiometry vis-a-vis photocatalysis. The structural study was performed using X-ray difractometry (XRD) and computation based on density functional theory (DFT). The simulation study showed that both the compounds belong to the Ruddlesden-Popper phase (A'<SUB>2</SUB>A<SUB>n-1</SUB>B<SUB>n</SUB>O<SUB>3n+1</SUB>; n=2 or 3). The surface morphology of the materials was studied using field emission scanning electron microscope (FESEM) and high resolution transmission electron microscope (HRTEM). The average particles size of perovskites Pb<SUB>2</SUB>Ga<SUB>2</SUB>Nb<SUB>2</SUB>O<SUB>10</SUB> and RbPb<SUB>2</SUB>Nb<SUB>2</SUB>O<SUB>7</SUB> was in the range 20-40 and 70-90nm respectively. The efficacy of these materials was studied to particle size and morphology as a visible light driven photocatalyst for the hydrogen generation from H<SUB>2</SUB>S. Electronic band structure with DOS has also been performed for both the materials. Being a stable single-phase ternary-layered oxide perovskites and band gap (2.75eV) in visible domain, they may have potential applications in electronic devices as well.
Nb2Zr6O17-xNx의 합성 : Oxynitride계 신규 가시광 광촉매
백진욱,K.G. Kanade,B.B. Kale 한국수소및신에너지학회 2006 한국수소 및 신에너지학회논문집 Vol.17 No.1
신규 Nb2Zr6O17-xNx 광촉매를 고상합성법처리(solid state synthesis) 후 암모니아가스(NH3)에 의한 기상처리법(ammonolysis)으로 합성하였다. 합성된 신규 광촉매 및 이를 다시 Pt 및 RuO2를 도핑 하여 H2S를 광분해하여 수소를 발생 실험을 수행하였다. 이 신규 oxynitrid계 광촉매는 가시광하에서 H2S를 광분해하여 수소를 발생하는(Quantum yield = 13.5 %) 우수한 광촉매 활성을 보여 주었다.