한국수소및신에너지학회논문집 (Transactions of the Korean hydrogen and new energy society)

  • 제18권3호
  • /
  • Pages.230-237
  • /
  • 2007
  • /
  • 1738-7264(pISSN)
  • /
  • 2288-7407(eISSN)
한국수소및신에너지학회 (The Korean Hydrogen and New Energy Society)
권호 표지

CdS/Titania-나노튜브 복합 막을 이용한 광촉매적 수소제조

CdS-Titania-Nanotube Composite Films for Photocatalytic Hydrogen Production

  • 이현미 (한국화학연구원 신화학연구단) ;
  • 소원욱 (한국화학연구원 신화학연구단) ;
  • 백진욱 (한국화학연구원 신화학연구단) ;
  • 공기정 (한국화학연구원 신화학연구단) ;
  • 문상진 (한국화학연구원 신화학연구단)
  • Lee, Hyun-Mi (Advanced Chemical Technology Division, Korea Research Institute of Chemical Technology) ;
  • So, Won-Wook (Advanced Chemical Technology Division, Korea Research Institute of Chemical Technology) ;
  • Baeg, Jin-Ook (Advanced Chemical Technology Division, Korea Research Institute of Chemical Technology) ;
  • Kong, Ki-Jeong (Advanced Chemical Technology Division, Korea Research Institute of Chemical Technology) ;
  • Moon, Sang-Jin (Advanced Chemical Technology Division, Korea Research Institute of Chemical Technology)
  • 발행 : 2007.09.15
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

알칼리 수열합성법에 의해 높은 비표면적을 갖는 티타니아 나노튜브(TiNT)를 합성하였다. 가시광용 광촉매로서의 응용성을 조사하기 위해 CdS 나노입자와 조성(r=TiNT/(CdS+TiNT))을 바꿔가며 일련의 무기 복합필름을 제조하였다. 또한 비교를 위해 티타니아 나노튜브 대신 티타니아 나노입자와 CdS로 구성된 복합체를 역시 제조하였다. 합성된 티타니아 나노튜브는 $200^{\circ}C$ 이상의 소결온도에서 부분적으로 튜브 구조의 붕괴가 시작되었지만, CdS와의 복합체는 $450^{\circ}C$ 까지도 비교적 안정한 구조를 유지하였다. (CdS+TiNT)복합필름은 티타니아 나노입자 복합계와 비교할 때 가시광 흡수 측면에서는 유사한 정도를 나타내었지만, 수소생산 활성과 광전류 발생은 오히려 훨씬 낮은 값을 나타내었다. 결과적으로, 티타니아 나노튜브는 그의 높은 비표면적에도 불구하고 자기들끼리의 응집성이 강하여 CdS와의 전기적 상호작용이 약하며, 특히 얇은 튜브벽 두께(${\sim}3nm$)와 낮은 결정성에 기인하는 약한 광전류 특성은 이의 광촉매로서의 응용성을 상당히 제한하는 요소로 나타났다.

Titania nanotube(TiNT) and CdS sol were synthesized by hydrothermal reaction under strongly basic condition and by precipitation reaction of $Cd(N0_3)_2$ and $Na_2S$ aqueous solutions, respectively. After preparing a series of CdS-TiNT composite films on $F:SnO_2$ conducting glass with variation of the mole ratio (r) of TiNT/(CdS+TiNT), their visible light absorption, photocatalytic activities for hydrogen production, and the photocurrent generation were examined. In general, this CdS-TiNT series showed lower photocatalytic activities and photocurrent generation under Xe light irradiation compared to their counterparts, i.e., CdS-$TiO_2$ particulate series. It appeared that TiNTs are not so effective photocatalyic material in spite of their larger specific surface areas compared to $TiO_2$ nanoparticles, because they indicate a poor crystallinity and less intimate interaction or contact with CdS particles owing to the tubular morphology and an easy agglomeration among themselves.

키워드

참고문헌

  1. Fujishima A, Honda k., 'Electrochemical photolysis of water at a semiconductor electrode', Nature, Vol. 238, 1972, p. 37 https://doi.org/10.1038/238037a0
  2. Kumar K. N. P, Keizer K, Burggraaf A. J. 'Stabilization of the porous texture of nanostructured titania by avoiding a phase transformation', J. Mater. Sci. Lett., Vol. 13, 1994, p. 59
  3. Oregan B, Gratzel M. A low-cost, 'high-efficiency solar cell based on dye-sensitized colloidal $TiO_2$ films', Nature, Vol. 353, No. 24, 1991, p. 737 https://doi.org/10.1038/353737a0
  4. Kasuga T, Hiramatsu M, Hoson A, Sekino T, Niihara K. 'Formation of titanium oxide nanotube', Langmuir, Vol. 14, 1998, p. 3160 https://doi.org/10.1021/la9713816
  5. Kasuga T, Hiramatsu M, Hoson A, Sekino T, Niihara K., 'Titania nanotubes prepared by chemical processing', Adv. Mater., Vol. 11, 1999, p. 1307 https://doi.org/10.1002/(SICI)1521-4095(199910)11:15<1307::AID-ADMA1307>3.0.CO;2-H
  6. Lee S. H, Gupta A. Wang S. L, Compaan A. D, McCandless B. E., 'Sputtered $Cd_{1-x}Zn_xTe$ films for top junctions in tandem solar cells', Solar Energy Materials and Solar Cells, Vol. 86, No. 4, 2005, p. 551 https://doi.org/10.1016/j.solmat.2004.09.008
  7. So W. W, Kim K. J, Moon S. J. 'Photo-production of hydrogen over the $CdSTiO_2$nano-composite particulate films treated with $TiCl_4$', Int. J. Hydrogen Energy, Vol. 29, 2004, p. 229 https://doi.org/10.1016/S0360-3199(03)00211-8
  8. So W. W, Jang J. S, Rhee Y. W, Kim K. J, Moon S. J., 'Preparation of nanosized crystalline CdS particles by the Hydrothermal Treatment', J. Colloid Interface Sci. Vol. 237, 2001, p. 136 https://doi.org/10.1006/jcis.2001.7489
  9. Moon S. J, So W. W, Chang H. Y. 'Effect of $TiCl_4$ treatment on photo- electrochemical properties of nano- crystalline CdS particulate films', J. Electrochem. Soc. Vol. 148, 2001, p. E378 https://doi.org/10.1149/1.1390346
  10. Yang J, Jin Z, Wang X, Li W, Zhang J, Zhang S, Guo X, Zhang Z., 'Study on composition, structure and formation process of nanotube $Na_2Ti_2O_4(OH)_2$', Dalton Trans. 2003, p. 3898
  11. Zhang M, Jin Z, Zhang J, Zhang S, Guo X, Yang J, Li W, Wang X, Zhang Z., 'Efffect of annealing temperature on morphology, structure, and photocatalytic behavior of nanotubed $H_2Ti_2O_4(OH)_2$', J. Molecular Cat. A, Vol. 217, 2004, p. 203 https://doi.org/10.1016/j.molcata.2004.03.032
  12. Zhang S, Peng L. M, Chen Q, Du G.H, Dawson G, Zhou W. Z., 'Formation mechanism of $H_2Ti_3O_7$ nanotubes', Phys. Rev. Lett., Vol. 91, No. 25, 2003, p. 256103 https://doi.org/10.1103/PhysRevLett.91.256103
  13. Wang W, Varghese O. K, Paulose M, Grimesa C. A, Wang Q, Dickey E. C. 'A study on the growth and structure of titania nanotubes', J. Mater. Res., Vol. 19, No.2, 2004, p. 417 https://doi.org/10.1557/jmr.2004.19.2.417
  14. Tambwekar S. V, Venugopal D, Subrahmanyam M., '$H_2$ production of (CdS-ZnS)- $TiO_2$ supported photocatalytic system', Int. J. Hydrogen Energy, Vol. 24, 1999, p. 957 https://doi.org/10.1016/S0360-3199(98)00123-2