| 초록 |
Heterojunction structures are attracting lots of attention for enhancing the electron injection across the interface. ZnO-In2S3@polyaniline one-dimensional nanohybrid films are synthesized on conducting glass substrates in a controlled way, using a simple three-step electrochemical deposition, chemical sulfurization of ZnO nanowire array as reactive template and spin-coating technique. The Electrochemical measurements were performed using a 1 kW xenon lamp (Newport) with its infrared wavelengths filtered out by water, and wavelengths below 420 nm removed by an optical filter, enabling measurements under visible light. The light irradiance, measured by a thermopile detector, was 100 mW/cm2. A monochromator (74,000, Newport) was used to investigate the monochromatic responses (for IPCE, applied bias photon to current efficiency (ABPE), and band gap energy measurements) of samples. 1 The as-prepared ZnO-In2S3@polyaniline one-dimensional nanohybrids are found to exhibit significantly an enhancement in the incident photon-to-electron conversion efficiency as compared to ZnO nanowire arrays. The observed enhancement in photoelectrochemical activity is attributed to the photosensitization effect of visible light responsive PANI. The special electron structure in the heterojunction helped to reduce the energy barrier height at the interface and enhanced the separation of photo-generated carriers. Thus, the photoelectrochemical performance and the dispersing stability of the composite photocatalysts in water were highly improved. Hence, our proposed structure is a promising candidate as a photoanode for solar energy-to-hydrogen conversion devices. |
