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Qijing Bu, Shuo Li, Qiannan Wu, Lingling Bi, Dejun Wang, Xiaoxin Zou, Tengfeng Xie
Semiconductor electrodes integrated with cocatalysts are key components of photoelectrochemistry (PEC) based solar-energy conversion. However, efforts to optimize the PEC device have been limited by an inadequate understanding of the interface interactions between semiconductor-cocatalyst (sem|cat) and cocatalyst-electrolyte (cat|ele) interface. In our work, we used ferrihydrite (Fh) modified Ti-Fe2O3 as a model to explore the transfer process of photogenerated charge carriers between Ti-Fe2O3-Fh (Ti-Fe2O3|Fh) interface and Fh-electrolyte (Fh|ele) interface...
August 8, 2018: ChemSusChem
Tayebeh Sharifi, Yousef Ghayeb, Tecush Mohammadi, Mohamad Mohsen Momeni
It is of great significance to develop green fuels in order to prevent the accumulation of carbon dioxide generated by the combustion of conventional fossil fuels. A potential, clean, renewable alternative fuel, which may be produced from solar energy, stored and safely transported, is hydrogen. In this work, bare CrTiO2 NTs were fabricated using an in situ anodizing process. CrTiO2 NTs were then modified with the photodeposition of noble metals (Ag and Au) at different light irradiation times (10-120 min)...
August 8, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Yingguang Zhang, Qun Lin, Na Tong, Zizhong Zhang, Huaqiang Zhuang, Xiaoyan Zhang, Wang Ying, Hongwen Zhang, Xuxu Wang
Photoelectrochemical (PEC) water splitting has been demonstrated as a promising way to acquire clean hydrogen energy. However, the efficiency has been limited by the high recombination rate of photogenerated electron-hole pairs. Herein, we provided a simple approach to construct a novel SnO2 quantum dots (QDs) modified TiO2 nanorod arrays (NAs) by the calcination of SnCl2 -adsorbed TiO2 NAs. The photocurrent density of SnO2 QDs/TiO2 NAs exhibits about 5 times higher than that of parent TiO2 NAs at a bias of 0...
August 8, 2018: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Degao Wang, Michael S Eberhart, Matthew V Sheridan, Ke Hu, Benjamin D Sherman, Animesh Nayak, Ying Wang, Seth L Marquard, Christopher J Dares, Thomas J Meyer
Stabilized photoanodes for light-driven water oxidation have been prepared on nanoparticle core/shell electrodes with surface-stabilized donor-acceptor chromophores, a water oxidation catalyst, and an electron-transfer mediator. For the electrode, fluorine-doped tin oxide FTO|SnO2 /TiO2 |-Org1-|1.1 nm Al2 O3 |-RuP2+ -WOC (water oxidation catalyst) with Org1 (1-cyano-2-(4-(diphenylamino)phenyl)vinyl)phosphonic acid), the mediator RuP2+ ([Ru(4,4-(PO3 H2 )2 -2,2-bipyridine)(2,2-bipyridine)2 ]2+ ), and the WOC, Ru(bda)(py(CH2 )(3or10) P(O3 H)2 )2 (bda is 2,2-bipyridine-6,6-dicarboxylate with x = 3 or 10), solar excitation resulted in photocurrents of ∼500 µA/cm2 and quantitative O2 evolution at pH 4...
August 6, 2018: Proceedings of the National Academy of Sciences of the United States of America
Kai Yan, Yuhan Zhu, Weihao Ji, Fang Chen, Jingdong Zhang
Artificial photocatalytic systems have been extensively established to mimic the natural solar-energy conversion process for developing useful photoelectric devices. In this work, a membraneless, hydrogen peroxide (H2O2)-based photocatalytic fuel cell (PFC) operated under visible light was proposed and applied in self-powered sensing of 3,3',4,4'-tetrachlorobiphenyl (PCB77). The PFC was comprised of a photoanode fabricated with gold nanoparticles-decorated graphitic C3N4 nanosheet and a cathode modified with hemin-graphene nanocomposites...
August 3, 2018: Analytical Chemistry
Kaustubh Basu, Hui Zhang, Haiguang Zhao, Sayantan Bhattacharya, Fabiola Navarro-Pardo, Prasanta Kumar Datta, Lei Jin, Shuhui Sun, Fiorenzo Vetrone, Federico Rosei
Photoelectrochemical (PEC) water splitting implementing colloidal quantum dots (QDs) as sensitizers is a promising approach for hydrogen (H2) generation, due to the QD's size-tunable optical properties. However, the challenge of long-term stability of the QDs is still unresolved. Here, we introduce a highly stable QD-based PEC device for H2 generation using a photoanode based on a SnO2-TiO2 heterostructure, sensitized by CdSe/CdS core/thick-shell "giant" QDs. This hybrid photoanode architecture leads to an appreciable saturated photocurrent density of ∼4...
August 1, 2018: Nanoscale
Suicai Zhang, Chen Yin, Zhuo Kang, Pingwei Wu, Jing Wu, Zheng Zhang, Qingliang Liao, Jin Zhang, Yue Zhang
Graphdiyne (GDY), a new member of 2D carbon material family, was introduced into a Si heterojunction (SiHJ) based photoelectrochemical water splitting cell. With assistance of magnetron sputtered NiOx, the plateau photocurrent density of SiHJ/GDY/NiOx-10 nm with optimized NiOx film thickness was twice higher than that of SiHJ/NiOx-10 nm, demonstrating the catalytic function of GDY itself as well as the synergistic effect between GDY and NiOx. The results verified that GDY is a promising photoelectrode material candidate to realize highly efficient PEC performance, and pave a novel pathway to further improve Si based PEC system...
August 1, 2018: ACS Applied Materials & Interfaces
Xu Shi, Kosei Ueno, Tomoya Oshikiri, Quan Sun, Keiji Sasaki, Hiroaki Misawa
Strong coupling between plasmons and optical modes, such as waveguide or resonator modes, gives rise to a splitting in the plasmon absorption band. As a result, two new hybrid modes are formed that exhibit near-field enhancement effects. These hybrid modes have been exploited to improve light absorption in a number of systems. Here we show that this modal strong coupling between a Fabry-Pérot nanocavity mode and a localized surface plasmon resonance (LSPR) facilitates water splitting reactions. We use a gold nanoparticle (Au-NP)/TiO2 /Au-film structure as a photoanode...
July 30, 2018: Nature Nanotechnology
Hiroyuki Tateno, Shoji Iguchi, Yugo Miseki, Kazuhiro Sayama
The photo-electrochemical C-H bond activation of cyclohexane to produce cyclohexanol and cyclohexanone (KA oil) with high partial oxidation selectivity (99 %) and high current utilization ratio (76 %) was achieved in air at room temperature at atmospheric pressure. The production rate of KA oil was accelerated by applying a bias. The incident photon to current efficiencies at 365 and 420 nm were 57 % and 24 %, respectively.
July 30, 2018: Angewandte Chemie
Dechao Chen, Huayang Zhang, Yunguo Li, Yingping Pang, Zongyou Yin, Hongqi Sun, Lai-Chang Zhang, Shaobin Wang, Martin Saunders, Emily Barker, Guohua Jia
Quasi-1D cadmium chalcogenide quantum rods (QRs) are benchmark semiconductor materials that are combined with noble metals to constitute QR heterostructures for efficient photocatalysis. However, the high toxicity of cadmium and cost of noble metals are the main obstacles to their widespread use. Herein, a facile colloidal synthetic approach is reported that leads to the spontaneous formation of cadmium-free alloyed ZnSx Se1- x QRs from polydisperse ZnSe nanowires by alkylthiol etching. The obtained non-noble-metal ZnSx Se1- x QRs can not only be directly adopted as efficient photocatalysts for water oxidation, showing a striking oxygen evolution capability of 3000 µmol g-1 h-1 , but also be utilized to prepare QR-sensitized TiO2 photoanodes which present enhanced photo-electrochemical (PEC) activity...
July 30, 2018: Advanced Materials
Mohamad Mohsen Momeni, Yousef Ghayeb, Negin Moosavi
Iron-doped TiO2 nanotubes (Fe-TNTs) have been prepared by one step anodization method. Nickel-platinum has then been deposited on the surface of these Fe-TNTs samples by electroless process during different periods of time. SEM, XRD and UV-Vis absorption spectroscopy have been used to study the surface morphologies, composition and optical properties of the synthetic samples. In addition, the impact of coupling the samples prepared with stainless steel 304 on the corrosion of metal under illumination has been studied...
July 26, 2018: Nanotechnology
Zhen Song, Gao-Chao Fan, Zimeng Li, Fengxian Gao, Xiliang Luo
Previous works on photoelectrochemical (PEC) biosensors have demonstrated that photoanode-based type possesses satisfying sensitivity, because photoanode utilize electrons as the majority charge carriers and a distinct photocurrent can be generated when electron donors are furnished. However, as hole-oxidation reaction occurs at the photoanode interface, photoanode-based PEC sensor has inferior anti-interference capacity to reductive substances coexisting in the biological sample, leading to a challenged selectivity...
July 25, 2018: Analytical Chemistry
Elias Doukas, Paraskevi Balta, Dimitrios Raptis, George Avgouropoulos, Panagiotis Lianos
The production of hydrogen by water splitting has been a very attractive idea for several decades. However, the energy consumption that is necessary for water oxidation is too high for practical applications. On the contrary, the oxidation of organics is a much easier and less energy-demanding process. In addition, it may be used to consume organic wastes with a double environmental benefit: renewable energy production with environmental remediation. The oxidation of organics in a photoelectrochemical cell, which in that case is also referenced as a photocatalytic fuel cell, has the additional advantage of providing an alternative route for solar energy conversion...
July 24, 2018: Materials
Yanhao Yu, Congli Sun, Xin Yin, Jun Li, Shiyao Cao, Chengyu Zhang, Paul M Voyles, Xudong Wang
Metastable intermediates represent a non-equilibrium state of matter that may impose profound impacts to materials properties beyond our understandings of monolithic and equilibrium systems. Here, we report a discovery of hidden metastable intermediates in amorphous TiO2 thin films and their critical role in electrochemical damage. These intermediates have a non-bulk crystal-like structure and exhibit significantly higher electrical conductivity than both the amorphous and the crystalline phases. When these TiO2 films are applied to protect Si photoelectrochemical (PEC) photoanodes, the intermediates can induce localized high electrical currents that largely accelerate the etching of the TiO2 film and the Si electrode underneath...
July 25, 2018: Nano Letters
Aimin Wei, Xinkai Xie, Zhen Wen, Hechuang Zheng, Huiwen Lan, Huiyun Shao, Xuhui Sun, Jun Zhong, Shuit-Tong Lee
Hematite is one of the most promising photoanodes for photoelectrochemical (PEC) solar water splitting. However, due to the low conduction band position for water reduction, an external bias is necessarily required with the consumption of extra power. In this work, a titanium modified hematite (Ti-Fe2 O3 ) photoanode-based self-powered PEC water splitting system in tandem with a rotatory disc-shaped triboelectric nanogenerator (RD-TENG) has been developed. It is a fantastic strategy to effectively drive the hematite-based PEC water splitting by using the environmental mechanical energy through a TENG...
July 25, 2018: ACS Nano
Wenhui Wang, Can Jin, Limin Qi
An efficient photoanode based on CdS nanorod@SnO2 nanobowl (CdS NR@SnO2 NB) arrays is designed and fabricated by the preparation of SnO2 nanobowl arrays via nanosphere lithography followed by hydrothermal growth of CdS nanorods on the inner surface of the SnO2 nanobowls. A photoelectrochemical (PEC) device constructed by using this hierarchical CdS NR@SnO2 NB photoanode presents significantly enhanced performance with a photocurrent density of 3.8 mA cm-2 at 1.23 V versus a reversible hydrogen electrode (RHE) under AM1...
July 19, 2018: Small
Ainhoa Cots, Pedro Bonete, David Sebastián, Vincenzo Baglio, Antonino S Aricò, Roberto Gómez
Tandem photoelectrochemical cells, formed by two photoelectrodes with complementary light absorption, have been proposed to be a viable approach for obtaining clean hydrogen. This requires the development of new designs that allow for upscaling, which would be favored by the use of transparent polymer electrolyte membranes (PEMs) instead of conventional liquid electrolytes. This article focuses on the photoelectrochemical performance of a water-splitting tandem cell based on a phosphorus-modified α-Fe2 O3 photoanode and on an iron-modified CuO photocathode, with the employment of an alkaline PEM...
August 1, 2018: ACS Applied Materials & Interfaces
Leonardo Girardi, Shuang Shuang, Gian Andrea Rizzi, Andrea Sartorel, Carla Marega, Zhengjun Zhang, Gaetano Granozzi
This paper describes the preparation and the photoelectrochemical performances of visible light driven photoanodes based on novel r-GO/β-Cu₂V₂O₇/TiO₂ nanorods/composites. β-Cu₂V₂O₇ was deposited on both fluorine doped tin oxide (FTO) and TiO₂ nanorods (NRs)/FTO by a fast and convenient Aerosol Assisted Spray Pyrolysis (AASP) procedure. Ethylenediamine (EN), ammonia and citric acid (CA) were tested as ligands for Cu2+ ions in the aerosol precursors solution. The best-performing deposits, in terms of photocurrent density, were obtained when NH₃ was used as ligand...
July 18, 2018: Nanomaterials
Chuanping Li, Ping Wang, Haijuan Li, Minmin Wang, Jie Zhang, Guohua Qi, Yongdong Jin
Understanding and controlling the charge transfer behavior across the interface/junction in hybrid nanostructures is essential for various plasmon-enhanced catalytic reactions. The rational design of plasmonic nanostructures offers a unique capability for eliminating the daunting complexity of the electronic effect induced by interfacial interactions and maximizing the conversion efficiency of solar energy into chemical energy by surface coupling. Herein, we tactfully construct a new type of plasmon-driven photoanode based on plasmonic metal-insulator-semiconductor (PMIS) hetero-nanostructures (Au@SiO2 NP-decorated α-Fe2 O3 nanorod array), by using Fe2 O3 nanoarrays as model semiconductor structures and Au@SiO2 NPs as photosensitizers, for optimizing the photoelectrochemical (PEC) water splitting performance...
August 7, 2018: Nanoscale
Johanna Eichhorn, Christoph Kastl, Jason K Cooper, Dominik Ziegler, Adam M Schwartzberg, Ian D Sharp, Francesca M Toma
The performance of energy materials hinges on the presence of structural defects and heterogeneity over different length scales. Here we map the correlation between morphological and functional heterogeneity in bismuth vanadate, a promising metal oxide photoanode for photoelectrochemical water splitting, by photoconductive atomic force microscopy. We demonstrate that contrast in mapping electrical conductance depends on charge transport limitations, and on the contact at the sample/probe interface. Using temperature and illumination intensity-dependent current-voltage spectroscopy, we find that the transport mechanism in bismuth vanadate can be attributed to space charge-limited current in the presence of trap states...
July 16, 2018: Nature Communications
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