Understanding the Enhancement in Photoelectrochemical Properties of Photocatalytically Prepared TiO<sub>2</sub>-Reduced Graphene Oxide Composite

Bell, Nicholas; Ng, Yun Hau; Du, Aijun; Coster, H.G.L.; Smith, Sean C.; Amal, Rose

doi:10.1021/jp1113575

Cited by 420 publications

(273 citation statements)

References 39 publications

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“…[33] The Raman spectra of Ben800, Th800, and Py800 present two firstorder Raman bands for disordered (D) at ≈1350 cm −1 and graphitic (G) carbon at ≈1590 cm −1 attributed to the breathing mode of k-point phonons of A 1g symmetry and the in-plane stretching motion of symmetric sp 2 CC bonds, respectively ( Figure S6, Supporting Information). [24,34] Inductively coupled plasma optical emission spectroscopy was also investigated for Ben750, Th850, and Py800 and detected only trace amounts of Fe and K (Table S3, Supporting Information). Due to this, we can exclude its influence on gas absorption measurements.…”

Section: Doi: 101002/adma201603051mentioning

confidence: 99%

Hyperporous Carbons from Hypercrosslinked Polymers

et al. 2016

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Section: Doi: 101002/adma201603051mentioning

confidence: 99%

Hyperporous Carbons from Hypercrosslinked Polymers

et al. 2016

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“…The film conductance was indicated in the frequency range from 10 mHz to 500 Hz. 12 The visible light-excited CuInS 2 -ZnO thin film exhibited the highest conductance compared with the individual component of ZnO film and CuInS 2 film. Under visible light, bare ZnO film was not excited; thus, the intrinsic conductance of ZnO was shown.…”

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confidence: 93%

Complete surface coverage of ZnO nanorod arrays by pulsed electrodeposited CuInS₂ for visible light energy conversion

et al. 2015

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a Well-aligned ZnO nanorods were uniformly coated with a layer of CuInS 2 nanoparticle photosensitizers using a tailored sequential pulsed electrodeposition. The formation of CuInS 2 -ZnO heterojunction with well-matched band energy alignment and the superior electron mobility in ZnO nanorods led to a remarkable 3.75 times improved photoelectrochemical performance of the electrode under visible light irradiation.Owing to the distinct electron transport behaviour, one dimensional (1D) nanoarrays of photoactive oxide materials have attracted considerable attention in the design of photovoltaics, liquid state photoelectrochemical cells, and photocatalysis. which could be either highly ordered or randomly packed.3 To extend the light-response of these wide band gap 1D-nanostructured oxides, decoration with narrow bandgap materials as photosensitizers is a popular and effective strategy. 4 Although powders of these oxides can be conveniently coated with binary and ternary photosensitizers (e.g. CdS and CuInS 2 ) using hydro (solvo-)thermal method, 5 it remains a great challenge to directly cover the surface of the 1D-nanostructures in the thin film configuration. For thin films, electrodeposition is a simple and effective technique to decorate compact films with a wide range of metallic components, but due to the differences in the deposition kinetics and mechanisms, coating the arrays of wellaligned nanorod and nanotube thin films with secondary components always results in an inadequate coverage of the 1D-nanostructures, and it is mostly limited to the top layer (or entrance)of the 1D-nanostructures. A generally accepted reason is that a gradient of precursor concentration exists throughout the length of the 1D-nanostructures. Higher concentration of the precursor at the top region of the 1D-nanostructures induces rapid nucleation or deposition when cathodic bias is applied. This leads to the immediate formation of the secondary component at the top region (entrance), and subsequently blocks/slows the diffusion of fresh precursor into the deeper region for successive deposition. CuInS 2 is a visible-light-active semiconductor with a chalcogenide-type crystal structure. It demonstrates great potential applications in photovoltaic cells and solar hydrogen cells. 6 Unlike depositing binary sulphides, electrodeposition of the ternary sulphide CuInS 2 is more challenging because it involves multi elemental deposition. Therefore, the objective of this study is to uniformly deposit CuInS 2 nanoparticles on vertically aligned ZnO nanorod arrays grown on a transparent charge collecting electrode, i.e. fluorine-doped tin oxide (FTO) glass substrate. The formation of effective junctions between ZnO and CuInS 2 will allow superior charge transfer from the photoexcited CuInS 2 to ZnO upon illumination. The charges can be efficiently collected at the charge collecting electrode to improve the charge utilisation. Together with greater light penetration into deeper regions of the 1-D nanostructured film, the pulsed-electrodepos...

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“…The sharp spike in the photocurrent during the on/off illumination cycles indicates fast generation and recombine of photogenerated electrons from the inverse opal films to the current collector. 58 By performing the transient decay analysis 45 as illustrated in Fig. 2c, where a more than twice as long transient decay time of 4.8 s is observed for the S-IO-TiO 2 in comparison to 2.6, 2 and 1.8 s for H-IO-(R/B), M-IO-(B) and M-IO-(R), respectively.…”

Section: Resultsmentioning

confidence: 98%

Sandwich-structured TiO₂ inverse opal circulates slow photons for tremendous improvement in solar energy conversion efficiency

et al. 2017

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To cite this version:Photon management has enabled a true revolution in the development of high-performance semiconductor materials and devices. Harnessing the highest amount of energy from photon relies on an ability to design and fashion structures to trap the light for the longer time inside the device for more electron excitation. The light harvesting efficiency in many thin-film optoelectronic devices is limited due to low photon absorbance. Here we demonstrate for the first time that slow photon circulation in sandwich-structured photonic crystals with two stopbands fine tuned are ideally suited to enhance and spectrally engineer light absorption. The sandwich-structured TiO 2 inverse opal possesses two stopbands, whose blue or red edge is respectively tuned to overlap with TiO 2 electronic excitation energy, thereby circulating the slow photons in the middle layer and enhancing light scattering at layer interfaces. This concept, together with the significantly increased control over photon management opens up tremendous opportunities for the realization of a wide range of highperformance, optoelectronic devices, and photochemical reactions.

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Understanding the Enhancement in Photoelectrochemical Properties of Photocatalytically Prepared TiO₂-Reduced Graphene Oxide Composite

Cited by 420 publications

References 39 publications

Hyperporous Carbons from Hypercrosslinked Polymers

Hyperporous Carbons from Hypercrosslinked Polymers

Complete surface coverage of ZnO nanorod arrays by pulsed electrodeposited CuInS₂ for visible light energy conversion

Sandwich-structured TiO₂ inverse opal circulates slow photons for tremendous improvement in solar energy conversion efficiency

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Understanding the Enhancement in Photoelectrochemical Properties of Photocatalytically Prepared TiO2-Reduced Graphene Oxide Composite

Cited by 420 publications

References 39 publications

Hyperporous Carbons from Hypercrosslinked Polymers

Hyperporous Carbons from Hypercrosslinked Polymers

Complete surface coverage of ZnO nanorod arrays by pulsed electrodeposited CuInS2 for visible light energy conversion

Sandwich-structured TiO2 inverse opal circulates slow photons for tremendous improvement in solar energy conversion efficiency

Contact Info

Product

Resources

About

Understanding the Enhancement in Photoelectrochemical Properties of Photocatalytically Prepared TiO₂-Reduced Graphene Oxide Composite

Complete surface coverage of ZnO nanorod arrays by pulsed electrodeposited CuInS₂ for visible light energy conversion

Sandwich-structured TiO₂ inverse opal circulates slow photons for tremendous improvement in solar energy conversion efficiency