Enhanced charge separation and transfer through Fe2O3/ITO nanowire arrays wrapped with reduced graphene oxide for water-splitting

Zhang, Zemin; Gao, Caitian; Li, Yunxia; Han, Weihua; Fu, Wenbin; He, Yongmin; Xie, Erqing

doi:10.1016/j.nanoen.2016.08.059

Cited by 73 publications

(46 citation statements)

References 64 publications

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“…Zhang et al [221] reported that the rGO integrated on ITO/ hematite nanowires could remarkably boost the water oxidation. Zhang et al [221] reported that the rGO integrated on ITO/ hematite nanowires could remarkably boost the water oxidation.…”

Section: Metal-free Cocatalystsmentioning

confidence: 99%

Rational Design and Construction of Cocatalysts for Semiconductor‐Based Photo‐Electrochemical Oxygen Evolution: A Comprehensive Review

et al. 2018

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Photo‐electrochemical (PEC) water splitting, as an essential and indispensable research branch of solar energy applications, has achieved increasing attention in the past decades. Between the two photoelectrodes, the photoanodes for PEC water oxidation are mostly studied for the facile selection of n‐type semiconductors. Initially, the efficiency of the PEC process is rather limited, which mainly results from the existing drawbacks of photoanodes such as instability and serious charge‐carrier recombination. To improve PEC performances, researchers gradually focus on exploring many strategies, among which engineering photoelectrodes with suitable cocatalysts is one of the most feasible and promising methods to lower reaction obstacles and boost PEC water splitting ability. Here, the basic principles, modules of the PEC system, evaluation parameters in PEC water oxidation reactions occurring on the surface of photoanodes, and the basic functions of cocatalysts on the promotion of PEC performance are demonstrated. Then, the key progress of cocatalyst design and construction applied to photoanodes for PEC oxygen evolution is emphatically introduced and the influences of different kinds of water oxidation cocatalysts are elucidated in detail. Finally, the outlook of highly active cocatalysts for the photosynthesis process is also included.

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Section: Metal-free Cocatalystsmentioning

confidence: 99%

Rational Design and Construction of Cocatalysts for Semiconductor‐Based Photo‐Electrochemical Oxygen Evolution: A Comprehensive Review

et al. 2018

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“…until their E f equalized. 33 At the equilibrium state, an electron depletion layer (marked as double layer charge between hematite and In 2 O 3 ) will be generated at the heterojunction interface and thus a built-in electron field will be formed, which will accelerate the separation of photo-generated charge carriers and reduce the recombination rate and thus result in enhanced photocurrent. 27,35 Since…”

Section: Introductionmentioning

confidence: 99%

Enhanced photoelectrochemical water splitting of hematite multilayer nanowire photoanodes by tuning the surface state via bottom-up interfacial engineering

Tang

Xie

Ros

et al. 2017

Energy Environ. Sci.

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“…Thinning the hematite layer should aim at shortening the holes transfer length and at the same time, enlarging the proportion of holes reaching to the semiconductor‐electrolyte interface. However, the pain layer has limited light absorption and surface reactive area, leading to mediocre performance . Therefore, application of a suitable scaffold for the hematite layer could be a feasible strategy to solve these problems at the same time.…”

Section: Introductionmentioning

confidence: 99%

“…However, the pain layer has limited light absorption and surface reactive area, leading to mediocre performance. [30] Therefore, application of a suitable scaffold for the hematite layer could be a feasible strategy to solve these problems at the same time. With a band gap of~2.7 eV and better electron conductivity than α-Fe 2 O 3 , WO 3 appears to be an attractive choice as the support of hematite.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Tungsten Trioxide/Hematite Core‐Shell Nanoarrays for Efficient Photoelectrochemical Water Splitting

et al. 2018

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Hematite, with a band gap of 2.0∼2.2 eV suitable for visible light absorption, has emerged to be a promising photoanode material for photoelectrochemical (PEC) catalysis of the oxygen evolution reaction (OER). Herein, we proposed the design and fabrication of a WO3/α‐Fe2O3 core‐shell heterojunction structure, aiming at alleviating the severe mismatch between the relatively long light penetration depth and the extremely short holes diffusion length in α‐Fe2O3. The WO3 nanoarray underlayer is grown directly on the FTO substrate, serving as an effective electron transfer layer and additional light absorber. The α‐Fe2O3 layer is further prepared via spin‐coating and a subsequent calcination process as a thin and uniform shell. The loading amount was regulated with different spin coating times of the precursor. The optimized WO3/α‐Fe2O3 core‐shell nanoarrays display an excellent performance with lower onset potential of 0.65 V vs. RHE and increased photocurrent response of 1.29 mA cm−2 at 1.23 V vs. RHE, much superior than the pristine α‐Fe2O3 or WO3 photoanode. Characterizations demonstrate that both improved light absorption and formation of heterojunction account for the excellent performance. After coating a NiFe‐LDH co‐catalyst layer, the oxygen evolution reaction is further enhanced, and high stability is achieved, benefiting from the efficient charge carrier generation, promoted charge separation in the semiconductor and the rapid consumption of holes for surface reaction.

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Enhanced charge separation and transfer through Fe2O3/ITO nanowire arrays wrapped with reduced graphene oxide for water-splitting

Cited by 73 publications

References 64 publications

Rational Design and Construction of Cocatalysts for Semiconductor‐Based Photo‐Electrochemical Oxygen Evolution: A Comprehensive Review

Rational Design and Construction of Cocatalysts for Semiconductor‐Based Photo‐Electrochemical Oxygen Evolution: A Comprehensive Review

Enhanced photoelectrochemical water splitting of hematite multilayer nanowire photoanodes by tuning the surface state via bottom-up interfacial engineering

Synthesis of Tungsten Trioxide/Hematite Core‐Shell Nanoarrays for Efficient Photoelectrochemical Water Splitting

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