Effect of Cr doping on the photoelectrochemical performance of hematite nanorod photoanodes

Shen, Shaohua; Jiang, Jiangang; Guo, Peijun; Kronawitter, Coleman X.; Mao, Samuel S.; Guo, Liejin

doi:10.1016/j.nanoen.2012.05.013

Cited by 132 publications

(86 citation statements)

References 57 publications

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“…22,[37][38][39][40] This is supported by our previous studies, which showed that both undoped and doped a-Fe 2 O 3 nanorod arrays showed low PEC performance when annealed near 450 C. 26,34 For this reason, a high temperature annealing process at 750 C for 5 min was used in this study to activate both undoped and Tidoped a-Fe 2 O 3 samples for PEC water splitting. (Fig.…”

Section: Morphologysupporting

confidence: 67%

Physical and photoelectrochemical characterization of Ti-doped hematite photoanodes prepared by solution growth

et al. 2013

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We present the fabrication and characterization of Ti-doped hematite (a-Fe 2 O 3 ) films for application as photoanodes in photoelectrochemical (PEC) cells for water splitting. It is demonstrated that Ti doping significantly improves the PEC activity as the photocurrent at 1.0 V vs. Ag/AgCl electrode for a 400 nm thick Ti-doped film (0.66 mA cm À2 ) was found to be $14 times higher than that of an undoped film (0.045 mA cm À2 ). The films were characterized by X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and ultrafast transient absorption spectroscopy to obtain information about their structural, electronic, and charge carrier dynamic properties. Based on characterization of the chemical states of the involved elements as well as the charge carrier dynamics of the films with Ti doping, it appears that the photocurrent enhancement is related to an increase in charge carrier density or reduced electron-hole recombination. The highest incident photon conversion efficiency (IPCE) measured for this system was 27.0% at 360 nm at a potential of 1.23 V vs. reversible hydrogen electrode (RHE), which was obtained on a 400 nm thick Ti-doped a-Fe 2 O 3 film.

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Section: Morphologysupporting

confidence: 67%

Physical and photoelectrochemical characterization of Ti-doped hematite photoanodes prepared by solution growth

et al. 2013

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“…Other approaches have focused on improving the kinetics of the water oxidation reaction, the rate‐limiting step for PEC water splitting with α‐Fe 2 O 3 , through surface treatments like surface doping and co‐catalyst incorporation . Metal elements, such as Cr, Zn, Ni, Sn, and Sb, have been doped onto the surface of α‐Fe 2 O 3 nanostructures to enhance PEC performance by promoting charge migration and/or used as a doped overlayer to catalyze the surface water oxidation reaction. Co‐catalyst surface modification has been shown to effectively enhance the surface reaction by facilitating the four‐electron process of water oxidation, resulting in suppressed surface charge recombination .…”

Section: Introductionmentioning

confidence: 99%

Enhancing Solar‐Driven Water Splitting with Surface‐Engineered Nanostructures

et al. 2018

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Functional nanoscale interfaces that promote the transport of photoexcited charge carriers are fundamental to efficient hydrogen production during photoelectrochemical (PEC) splitting of water. Here, the realization of a functional one‐dimensional nanostructure achieved through surface engineering of hematite (α‐Fe2O3) nanorods with a TiO2 overlayer is reported. The surface‐engineered hematite nanostructure exhibits significantly improved PEC performance as compared to untreated α‐Fe2O3, with an increase in the maximum incident photon‐to‐current efficiency (IPCE) of nearly 400% at 350 nm. While addition of the TiO2 overlayer did not alter the lifetime of photoexcited charge carriers, as evidenced from transient absorption spectroscopy, it is found that the presence of TiO2 could enhance oxygen electrocatalysis by interfacial electron enrichment, largely attributed to enhanced O(2p)−Fe(3d) hybridization. Moreover, the interfacial electronic structure revealed from XANES measurements of the α‐Fe2O3/TiO2 nanorods suggests that photoexcited holes in α‐Fe2O3 may efficiently transfer through the TiO2 overlayer to the electrolyte while electrons migrate to the external circuit along the one‐dimensional nanorods, thereby promoting charge separation and enhancing PEC splitting of water.

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“…Silicon and III‐V semiconductors, perovskites, as well as metal oxide semiconductors are three aspects for promising PEC photoanodes. Various metal oxides such asTiO 2 , ZnO Fe 2 O 3 Cu 2 O and WO 3 have been widely investigated during the past decades. Among them, ZnO is widely used as photoanodes for PEC water splitting due to its superior stability, higher electron mobility, environmental friendliness, as well as its great accessibility and moderate cost.…”

Section: Introductionmentioning

confidence: 99%

MoS₂ nanosheet/ZnO nanowire hybrid nanostructures for photoelectrochemical water splitting

Dong

Zhang

et al. 2018

J Am Ceram Soc

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As an efficient cocatalyst, the 2D MoS2 is thought to be a promising substitute to noble metals in the hydrogen evolution reaction (HER). In the past few years, single and few‐layer MoS2 nanosheets have attracted a wide range of concerns for HERs. In this paper, single crystalline ZnO nanowires and MoS2 nanosheets are fabricated to form MoS2 nanosheet/ZnO nanowire hybrid nanostructure to enhance the hydrogen photogeneration. The results show that the hybridization of ZnO with moderate MoS2 loading could enhance the PEC activity by producing more electrons and holes and reducing their recombination. The synthesis of MoS2/ZnO composites proposed an effective way to build low cost and highly active HER catalysts. Moreover, the study on MoS2/ZnO composites sheds light to the deep insight into the mechanism of photoelectrocatalytic HERs.

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Effect of Cr doping on the photoelectrochemical performance of hematite nanorod photoanodes

Cited by 132 publications

References 57 publications

Physical and photoelectrochemical characterization of Ti-doped hematite photoanodes prepared by solution growth

Physical and photoelectrochemical characterization of Ti-doped hematite photoanodes prepared by solution growth

Enhancing Solar‐Driven Water Splitting with Surface‐Engineered Nanostructures

MoS₂ nanosheet/ZnO nanowire hybrid nanostructures for photoelectrochemical water splitting

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Effect of Cr doping on the photoelectrochemical performance of hematite nanorod photoanodes

Cited by 132 publications

References 57 publications

Physical and photoelectrochemical characterization of Ti-doped hematite photoanodes prepared by solution growth

Physical and photoelectrochemical characterization of Ti-doped hematite photoanodes prepared by solution growth

Enhancing Solar‐Driven Water Splitting with Surface‐Engineered Nanostructures

MoS2 nanosheet/ZnO nanowire hybrid nanostructures for photoelectrochemical water splitting

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Product

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MoS₂ nanosheet/ZnO nanowire hybrid nanostructures for photoelectrochemical water splitting