Inorganic Nanotube/Organic Nanoparticle Hybrids for

doi:10.1016/j.jmst.2016.08.030

Abstract

Abstract:

Inorganic/organic nanohybrids composed of arrayed TiO₂ nanotubes (TiNTs)/porphyrin nanoparticles (NPs) have been fabricated via a wet chemical approach. The inorganic component, particularly the arrayed one-dimensional (1D) nanostructures, provides high charge-carrier mobility and rapid charge transport. The organic component exhibits extensive visible light absorption and good solution processability. Additionally, the geometric restraint by supramolecular assembly renders an improved photostability. A combination of these two components could thus allow for an efficient solar energy conversion. In this work, a colloid of porphyrin NPs prepared by a solvent exchange method is coated on anodic TiNTs by means of a dip-coating treatment to form inorganic/organic hybrids. The hybrids exhibit an improvement on solar absorption and a significant enhancement on photocurrent generation at a small bias compared with individual component. Herein, the inorganic/organic nanohybrids are proved to be excellent photoanodes highly responsive to visible light and thus pave a way to discover new inorganic/organic assemblies for high-performance optoelectronic applications, as well as for device integration.

Key words: Anodic TiO₂ nanotubes, Porphyrin nanoparticles, Inorganic/organic nanohybrid, Photoelectrochemical water splitting

Chen Yingzhi, Li Aoxiang, Jin Ming, Lu-NingWang, Zheng-HongHuang. Inorganic Nanotube/Organic Nanoparticle Hybrids for[J]. J. Mater. Sci. Technol., 2017, 33(7): 728-733.

Figures/Tables 7

Fig. 1. (a) The molecular structure of TPP and (b) the photograph of TPP NPs colloid.

Fig. 2. (a) Top-view and (b) side-view SEM images of TiNTs, (c) TEM image of TPP NPs, and SEM images of hybrid I (d), hybrid II (e), hybrid III (f), hybrid IV (g), and hybrid V (h).

Fig. 3. (a) XRD patterns and (b) Raman spectra of TiNTs, TPP and TiO2/TPP hybrids.

Fig. 4. UV-vis absorption spectra of TiNTs, TPP and TiO2/TPP hybrids.

Fig. 5. XPS results of survey scan spectra (a), Ti 2p (b) and C 1s region.

Fig. 6. (a) Photocurrent vs. applied potential, (b) photocurrent vs. time plots (at 0.05 V vs. SCE) and (c) Nyquist plot (at 0.05 V vs. SCE) for the obtained samples in 1 mmol/L NaOH solution under chopped illumination of 100 mW/cm2.

Fig. 7. Schematic illustration of the hybrid structure for the photogenerated electron generation, separation and transfer path.

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