Preparation and Photoelectrochemical Properties of n-Type Macroporous Si/TiO2 Nanowire Heterostructure†

doi:10.7503/cjcu20150378

Abstract

Abstract:

n-Type macroporous silicon as substrate material was prepared by photo-assisted electrochemical etching. The TiO₂ nanowire cover layer on macroporous silicon was prepared by hydrothermal method. Thus, n-type macroporous Si/TiO₂ nanowire heterostructure was obtained. The formation of n-type macroporous Si/TiO₂ nanowire heterostructure was confirmed by X-ray diffraction(XRD), scanning electron microscope(SEM), energy dispersive X-ray detector(EDX). The UV-Vis diffusion reflectance spectra showed that n-type macroporous Si/TiO₂ nanowire heterostructure had the strongest absorption among the four tested samples. The photoelectric performance tests showed that n-type macroporous Si/TiO₂ nanowire heterostructure had higher photocurrent than the n-type macroporous Si and the n-type Si/TiO₂ nanowire. The results showed that n-type macroporous Si/TiO₂ nanowire heterostructure as photoanode improved the performance of photoelectrochemical water splitting.

Key words: Macroporous silicon, Photoanode, TiO2 nanowire, Heterostructure

CLC Number:

O645

TrendMD:

KOU Yanqiang, YANG Jikai, ZHU Lingxi, YU Changming. Preparation and Photoelectrochemical Properties of n-Type Macroporous Si/TiO₂ Nanowire Heterostructure^†[J]. Chem. J. Chinese Universities, 2015, 36(12): 2485.

Figures/Tables 8

Fig.1 XRD patterns of n-type macroporous Si(a) and n-type macroporous Si/TiO2 nanowire(b)

Fig.2 Metallurgical microscopy images of n-type macroporous Si (A) Top-view; (B) cross-sectional view.

Fig.3 SEM images of n-type macroporous Si/TiO2 nanowire heterostructure with different magnifications

Fig.4 EDX spectrum of n-type macroporous Si/TiO2 nanowire heterostructure

Fig.5 Diffuse reflectance spectra of the materials Sample: a. n-type Si; b. n-type macroporous Si; c. n-type Si/TiO2; d. n-type macroporous Si/TiO2 nanowire heterostructure.

Fig.6 Determination of indirect interband transition energies of n-type macroporous Si(a) and n-type macroporous Si/TiO2 nanowire heterostructure(b)

Fig.7 Comparison of PEC performance of n-type macroporous Si(a,a'), n-type Si/TiO2 nanowire(b,b') and n-type macroporous Si/TiO2 nanowire heterostructure(c,c') in dark(a—c) and sunlight(a'—c')

Fig.8 Schematic band diagram of an n-type TiO2/n-type Si heterojunction and correspondingcharge transfer when applied as a PEC anode

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Preparation and Photoelectrochemical Properties of n-Type Macroporous Si/TiO₂ Nanowire Heterostructure^†

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