Efficient p-zinc phthalocyanine/n-fullerene organic bilayer electrode for molecular hydrogen evolution induced by the full visible-light energy

Abe, Toshiyuki; Hiyama, Yudai; Fukui, Katsuma; Sahashi, Kana; Nagai, Keiji

doi:10.1016/j.ijhydene.2015.05.155

Cited by 17 publications

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References 26 publications

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“…24 Recently, more efficient H 2 production was found to occur by the replacement of H 2 Pc by zinc phthalocyanine (ZnPc, p type). 25 In the present study, a photoelectrochemical water-splitting system was studied, where TiO 2 (photoanode) and a ZnPc/C 60 bilayer modified by Pt (photocathode, vide supra) were simultaneously employed for water oxidation and H + reduction, respectively (Scheme 1). The stoichiometric decomposition of water into H 2 and O 2 was found to occur upon application of bias voltages o1.23 V. Moreover, this study demonstrated that photocatalytic water decomposition (i.e.…”

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“…0.03 nm s À1 ) using an indium-tin-oxide (ITO)-coated glass plate as the base material. 25 The organic p-n bilayer was composed of ZnPc coated on ITO and C 60 coated on top of the ZnPc layer; moreover, a Pt co-catalyst was photocathodically deposited onto the C 60 surface of the bilayer (the resulting device is abbreviated as ITO/ZnPc/C 60 -Pt). A disk-like form of TiO 2 (rutile) was utilised as the photoanode, which was reductively treated under a hydrogen flow at 773 K for 2 h prior to use.…”

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A water splitting system using an organo-photocathode and titanium dioxide photoanode capable of bias-free H₂ and O₂ evolution

et al. 2016

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This study examined a water-splitting system comprising a TiO2 photoanode and an organo-photocathode consisting of a p-n bilayer. Stoichiometric decomposition of water into H2 and O2 successfully occurred at bias voltages lower than the theoretical value (i.e. 1.23 V). Compared to the conventional TiO2 and Pt systems, the proposed water-splitting system demonstrated water splitting without any externally applied bias.

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A water splitting system using an organo-photocathode and titanium dioxide photoanode capable of bias-free H₂ and O₂ evolution

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“…40 ZnPc was rst coated on ITO, followed by the coating of C 60 on top of the ZnPc layer; moreover, a Pt co-catalyst was photocathodically deposited onto the C 60 surface of the bilayer. 39,40 The resulting photocathode is abbreviated as ITO/ ZnPc/C 60 -Pt. A WO 3 lm coated on an F-doped tin oxide (FTO) was prepared according to the following procedures.…”

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confidence: 99%

“…[30][31][32][33][34][35][36][37][38][39][40] For example, an organic pn bilayer of phthalocyanine [MPc (M ¼ H 2 or Zn), p-type] and fullerene (C 60 , n-type) can function as a photocathode, where a reducing power can be generated at the C 60 /water interface through a series of photophysical events within the bilayer.…”

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A visible-light-induced photoelectrochemical water-splitting system featuring an organo-photocathode along with a tungsten oxide photoanode

2017

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A photoelectrochemical water-splitting system featuring an organo-photocathode of a p-n bilayer was studied, where WO 3 was simultaneously utilized as a photoanode. Stoichiometric formation of H 2 and O 2 was found to occur due to the decomposition of water. In the reference system of a WO 3 photoanode and Pt counter electrode, bias voltages more than 0.4 V were needed to be applied for water splitting; however, the present system successfully led to water decomposition by applying only a low voltage of 0.1 V to the system. In the present water-splitting system, oxidizing and reducing powers can be separately generated at the WO 3 photoanode and organo-photocathode, respectively, which is distinct from the reference system. Furthermore, electron transfer from WO 3 (conduction band) to the hole-retained p-type layer (valence band) in the organo-photocathode can efficiently occur for completing the photoelectrochemical process, thus, resulting in a high concentration of holes available for rate-limiting O 2 evolution at WO 3 on the basis of efficient charge separation.

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Carbon‐Based Photocathode Materials for Solar Hydrogen Production

2018

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Hydrogen is considered a promising environmentally friendly energy carrier for replacing traditional fossil fuels. In this context, photoelectrochemical cells effectively convert solar energy directly to H fuel by water photoelectrolysis, thereby monolitically combining the functions of both light harvesting and electrolysis. In such devices, photocathodes and photoanodes carry out the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER), respectively. Here, the focus is on photocathodes for HER, traditionally based on metal oxides, III-V group and II-VI group semiconductors, silicon, and copper-based chalcogenides as photoactive material. Recently, carbon-based materials have emerged as reliable alternatives to the aforementioned materials. A perspective on carbon-based photocathodes is provided here, critically analyzing recent research progress and outlining the major guidelines for the development of efficient and stable photocathode architectures. In particular, the functional role of charge-selective and protective layers, which enhance both the efficiency and the durability of the photocathodes, is discussed. An in-depth evaluation of the state-of-the-art fabrication of photocathodes through scalable, high-troughput, cost-effective methods is presented. The major aspects on the development of light-trapping nanostructured architectures are also addressed. Finally, the key challenges on future research directions in terms of potential performance and manufacturability of photocathodes are analyzed.

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Efficient p-zinc phthalocyanine/n-fullerene organic bilayer electrode for molecular hydrogen evolution induced by the full visible-light energy

Cited by 17 publications

References 26 publications

A water splitting system using an organo-photocathode and titanium dioxide photoanode capable of bias-free H₂ and O₂ evolution

A water splitting system using an organo-photocathode and titanium dioxide photoanode capable of bias-free H₂ and O₂ evolution

A visible-light-induced photoelectrochemical water-splitting system featuring an organo-photocathode along with a tungsten oxide photoanode

Carbon‐Based Photocathode Materials for Solar Hydrogen Production

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Efficient p-zinc phthalocyanine/n-fullerene organic bilayer electrode for molecular hydrogen evolution induced by the full visible-light energy

Cited by 17 publications

References 26 publications

A water splitting system using an organo-photocathode and titanium dioxide photoanode capable of bias-free H2 and O2 evolution

A water splitting system using an organo-photocathode and titanium dioxide photoanode capable of bias-free H2 and O2 evolution

A visible-light-induced photoelectrochemical water-splitting system featuring an organo-photocathode along with a tungsten oxide photoanode

Carbon‐Based Photocathode Materials for Solar Hydrogen Production

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A water splitting system using an organo-photocathode and titanium dioxide photoanode capable of bias-free H₂ and O₂ evolution

A water splitting system using an organo-photocathode and titanium dioxide photoanode capable of bias-free H₂ and O₂ evolution