Synthesis and photoelectrochemical cell properties of vertically grown α-Fe2O3 nanorod arrays on a gold nanorod substrate

Mao, Aiming; Han, Gui Young; Park, Jae Hyung

doi:10.1039/b921965j

Cited by 73 publications

(47 citation statements)

References 21 publications

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“…For the former approach, attaining single-crystalline nanowires of the appropriate diameter (10-20 nm), the proper orientation, and doping will realize high photocurrents. A templating technique [98] will likely be successful in this regard. On the other hand, the ETA approach has an attractive advantage as doping, and crystal orientation may not be necessary, but the suitable scaffold and buffer layer must be developed to eliminate interfacial recombina- www.chemsuschem.org tion.…”

Section: Discussionmentioning

confidence: 98%

“…[97] Recently, a method to prepare hematite nanorod arrays using an anodic aluminum oxide (AAO) template was reported. [98] Gold was sputtered onto one side of a 60 mm thick AAO membrane with 200 nm diameter pores. Electrodeposition of iron oxide from aqueous solution, annealing at 500 8C, and the subsequent removal of the AAO by dissolution gave the final structure.…”

Section: Fe 2 O 3 Nanowire Arraysmentioning

confidence: 99%

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Solar Water Splitting: Progress Using Hematite (α‐Fe₂O₃) Photoelectrodes

2011

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Photoelectrochemical (PEC) cells offer the ability to convert electromagnetic energy from our largest renewable source, the Sun, to stored chemical energy through the splitting of water into molecular oxygen and hydrogen. Hematite (α-Fe(2)O(3)) has emerged as a promising photo-electrode material due to its significant light absorption, chemical stability in aqueous environments, and ample abundance. However, its performance as a water-oxidizing photoanode has been crucially limited by poor optoelectronic properties that lead to both low light harvesting efficiencies and a large requisite overpotential for photoassisted water oxidation. Recently, the application of nanostructuring techniques and advanced interfacial engineering has afforded landmark improvements in the performance of hematite photoanodes. In this review, new insights into the basic material properties, the attractive aspects, and the challenges in using hematite for photoelectrochemical (PEC) water splitting are first examined. Next, recent progress enhancing the photocurrent by precise morphology control and reducing the overpotential with surface treatments are critically detailed and compared. The latest efforts using advanced characterization techniques, particularly electrochemical impedance spectroscopy, are finally presented. These methods help to define the obstacles that remain to be surmounted in order to fully exploit the potential of this promising material for solar energy conversion.

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Section: Discussionmentioning

confidence: 98%

Section: Fe 2 O 3 Nanowire Arraysmentioning

confidence: 99%

Solar Water Splitting: Progress Using Hematite (α‐Fe₂O₃) Photoelectrodes

2011

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“…Much work has been reported on the improvement of solar energy conversion efficiency by using 1-D α-Fe 2 O 3 nanostructures. For example, Mao et al [47] reported the growth of vertically aligned α-Fe 2 O 3 nanorod arrays on a god nanorod substrate and studied their photoelectrochemical cell properties. The aligned α-Fe 2 O 3 nanorod arrays were grown via a template-assisted method.…”

Section: Solar Energy Conversion Propertiesmentioning

confidence: 98%

One-dimensional iron oxides nanostructures

Chen

Xiong

Ran

et al. 2011

Sci. China Phys. Mech. Astron.

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Iron oxides, including α-Fe 2 O 3 , γ-Fe 2 O 3 , Fe 3 O 4 , etc. are one of the most widely investigated materials for their fundamental properties and potential applications. One-dimensional (1-D) iron oxides nanostructures are the focus of recent research activities because of their wide applications in magnetic refrigeration, information storage, electronics, catalysts, Li-ion battery, pigment, gas sensors, etc. This review covers the recent progress in the synthesis, properties and applications of 1-D iron oxides nanostructures. The paper begins with the introduction to 1-D iron oxides nanostructures, followed by the typical synthetic methods developed for the synthesis of 1-D iron oxides nanostructures. Then, the typical 1-D iron oxides nanostructures, including nanowires/nanorods, nanotubes, nanobelts, nanochains, and special 3-D structures built on 1-D building blocks, are introduced in detail. The properties of 1-D iron oxides nanostructures are then discussed, focusing on the magnetic, gas sensing, and electrochemical and photocatalytic properties. Finally, we draw conclusions and look at the prospects of 1-D iron oxides nanostructures.iron oxide, nanowires, magnetic PACS: 63.22.Gh, 75.75.Cd, 75.47.Lx

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“…[6] Severalm ethods have been reported for the fabrication of hematite nanorodo rn anowirea rrays, includingt hermalo xidation, [10] hydrothermalt reatment, [11,12] and an anodic aluminumo xide templatea pproach. [13] Compared with other methods, hydrothermal treatment is simple and can be easily conducted without the need for templateso re xcessively hightemperatures. [14,15] In addition to hematite, goethite (FeOOH)h as also aroused researchattention due to its good electrocatalytic performance in the oxygene volution reaction (OER).…”

Section: Introductionmentioning

confidence: 99%

Abnormal Cathodic Photocurrent Generated on an n‐Type FeOOH Nanorod‐Array Photoelectrode

Chen

Lyu

Liu

et al. 2016

Chemistry A European J

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A simple, wet-chemical method for the synthesis of an FeOOH nanorod-array photoelectrode on fluorine-doped tin oxide (FTO) glass is reported. Nanorods of diameter about 35 nm and length about 300 nm have been vertically grown on an FTO substrate. Upon calcination, the FeOOH phase could be easily converted to a hematite structure while maintaining the shape of the nanorod array. An interesting abnormal cathodic photocurrent is generated on the FeOOH nanorod-array photoelectrode under illumination, which is totally different from that obtained on a calcined hematite photoelectrode under the same experimental conditions. The cathodic photocurrent density generated on the FeOOH photoelectrode can also be tuned by applying an electrochemical anodic or cathodic treatment. Detailed analysis has revealed that higher valence state Fe(IV) species in the FeOOH photoelectrode play an important role in sacrificing the photoexcited electrons for generation of the cathodic photocurrent. Comparison between the FeOOH and hematite photoelectrodes allows for a better understanding of the interplay between crystal structure, surface reactions, and photocurrent. The findings on this new abnormal phenomenon could also provide guidance for the design of new types of semiconducting photoelectrochemical devices.

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Synthesis and photoelectrochemical cell properties of vertically grown α-Fe2O3 nanorod arrays on a gold nanorod substrate

Cited by 73 publications

References 21 publications

Solar Water Splitting: Progress Using Hematite (α‐Fe₂O₃) Photoelectrodes

Solar Water Splitting: Progress Using Hematite (α‐Fe₂O₃) Photoelectrodes

One-dimensional iron oxides nanostructures

Abnormal Cathodic Photocurrent Generated on an n‐Type FeOOH Nanorod‐Array Photoelectrode

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Synthesis and photoelectrochemical cell properties of vertically grown α-Fe2O3 nanorod arrays on a gold nanorod substrate

Cited by 73 publications

References 21 publications

Solar Water Splitting: Progress Using Hematite (α‐Fe2O3) Photoelectrodes

Solar Water Splitting: Progress Using Hematite (α‐Fe2O3) Photoelectrodes

One-dimensional iron oxides nanostructures

Abnormal Cathodic Photocurrent Generated on an n‐Type FeOOH Nanorod‐Array Photoelectrode

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Solar Water Splitting: Progress Using Hematite (α‐Fe₂O₃) Photoelectrodes

Solar Water Splitting: Progress Using Hematite (α‐Fe₂O₃) Photoelectrodes