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Yuxi Pi, Bo Liu, Zhen Li, Yukun Zhu, Yang Li, Fengbao Zhang, Guoliang Zhang, Wenchao Peng, Xiaobin Fan
A novel three-dimensional (3D) photoanode consisting of TiO2 nanorod arrays (TiO2 NAs) coated by exfoliated WS2 nanosheets was fabricated for enhanced photoelectrochemical water oxidation. Mixed phase WS2 nanosheets with 1 T percentage of 55% were exfoliated by the lithium insertion, which were then coated on the top of TiO2 NAs by a drop-casting method. By optimizing the loading amount of WS2 , a maximum photocurrent of ∼1.8 mA/cm2 could be obtained at +1.8 V vs. RHE under AM 1.5 irradiation (100 mW/cm2 ), which is 2...
March 14, 2019: Journal of Colloid and Interface Science
Lei Zhang, Chao Liang, Hai Guo, Cheng-Gang Niu, Xiu-Fei Zhao, Xiao-Ju Wen, Guang-Ming Zeng
The development of high-performance photocatalytic fuel cells (PFCs) is seriously hampered by poor light utilization rates and low charge carrier transfer efficiency. Herein, we have experimentally obtained plasmonic Ag modified Cr-BiOCl (Cr-BOC/Ag) with high visible light photocatalytic activity and provided direct evidence for the substantially enhanced catalytic activity in metal-semiconductor photocatalysts. The experimental results revealed that the Cr doping and Ag modification could not only extend the photo absorption of BiOCl from the UV to the visible light region but could also greatly increase the generation and transfer rate of charge carriers because of its narrowed band gap and the localized surface plasmon resonance (LSPR) effect of metallic Ag...
March 21, 2019: Nanoscale
Wei Huang, Catalin Harnagea, Xin Tong, Daniele Benetti, Shuhui Sun, Mohamed Chaker, Federico Rosei, Riad Nechache
The photoelectric properties of multiferroic double-perovskite Bi2FeCrO6 (BFCO), such as above-bandgap photovoltages, switchable photocurrents and bulk photovoltaic effect, have recently been explored for potential applications in solar technology. Here we report the fabrication of photoelectrodes based on n-type ferroelectric (FE) semiconductor BFCO heterojunctions coated with p-type transparent conducting oxides (TCOs) by pulsed laser deposition, and their application for photoelectrochemical (PEC) water oxidation...
March 20, 2019: ACS Applied Materials & Interfaces
Kaushik Natarajan, Anoop Gupta, Shagufi Naz Ansari, Mohit Saraf, Shaikh M Mobin
The structural diversity of Co(II) metal centers is known to influence their physico-chemical properties. A novel 2D Co(II)-MOF {[Co5 (HL)4 (dpp)2 (H2 O)2 (µ-OH)2 ]∙21H2 O}n has been designed and synthesized by adopting mixed ligand strategy, using 1,3-di(4-pyridyl)propane (dpp) co-linker with a flexible spacer H3 L (H3 L: 5-(2 Carboxybenzyloxy)isophthalic acid). Co(II)-MOF features a 2D-network which is further interpenetrated among the equivalent sets and therefore results in a 3D supramolecular network...
March 19, 2019: ACS Applied Materials & Interfaces
Mostafa Afifi Hassan, Muhammad Ali Johar, Aadil Waseem, Indrajit V Bagal, Jun-Seok Ha, Sang-Wan Ryu
A core-shell structure, formed in a nanostructured photoanode, is an effective strategy to achieve high solar-to-hydrogen conversion efficiency. In this study, we present a facile and simple synthesis of a unique vertically aligned ZnO/ZnS core-shell heterostructure nanowires (NWs) on a Si substrate. Well-aligned ZnO NWs were grown on Si (100) substrates on a low-temperature ZnO buffer layer by metal-organic chemical vapor deposition. The ZnO NWs were then coated with various thicknesses of ZnS shell layers using atomic layer deposition...
February 18, 2019: Optics Express
Ronglei Fan, Zetian Mi, Mingrong Shen
Solar water splitting using Si photoelectrodes in photoelectrochemical (PEC) cells offers a promising approach to convert sunlight into sustainable hydrogen energy, which has recently received intense research. This review summarizes the recent advances in the development of efficient and stable Si photoelectrodes for solar water splitting. The definition and representation of efficiency and stability for Si photoelectrodes are firstly introduced. We then present several basic strategies for designing highly efficient and stable Si photoelectrodes, including surface textures, protective layer, catalyst loading and the integration of the system...
February 18, 2019: Optics Express
Haijiao Lu, Rajesh B Jethwa, Kellie J Jenkinson, Andrew E H Wheatley, Hongxun Hao, Dominic S Wright, Sebastian D Pike
VO(OiPr)3 is a useful precursor for the synthesis of a range of metal-doped polyoxovanadate (POV) cage compounds, its reactions with hydrated metal salts providing a route to arrangements containing Bi and other main group metals, transition metals and lanthanides. The new POV compounds [Bi2(DMSO)6V12O33Br]2[M(DMSO)6] (2Br-M, M = CoII, NiII, CuII, ZnII) [Bi2(DMSO)6V12O33Cl]2[Ca(DMSO)x]·yDMSO (2Cl-Ca), [Bi2(DMSO)6V12O33Cl]2[LnCl(DMSO)7] (2Cl-Ln, Ln = LaIII, CeIII, EuIII), [Bi2(DMSO)6V10O28F2]3[Bi(DMSO)5]2 (3), [V12O32(DMSO)][Gd(NO3)(DMSO)5...
March 14, 2019: Dalton Transactions: An International Journal of Inorganic Chemistry
Zihe Cai, Yang Yan, Lin Liu, Shengxuan Lin, Xiaobin Hu
Photoelectrochemical carbon dioxide conversion to fuels such as carbon monoxide, methanol, and ethylene exhibits great potential to solve energy issues. Unfortunately, CO2 conversion efficiency is still low due to violent charge recombination at the photoanode. Herein, a novel 3D macroporous ferroelectric heterojunction composed of BiFeO3 and LiNbO3 is developed by a template-assisted sol-gel method, aiming at facilitating charge transfer kinetics. As expected, a tremendous enhancement of photocurrent density (300 times vs bare planar BiFeO3 film) and charge transfer efficiency (up to 76%) is obtained in the HCO3 - /CO2 system without any cocatalyst...
March 5, 2019: Small
Ira A Weinstock, Biswarup Chakraborty, Gal Gan-Or, Yan Duan, Manoj Raula
Although metal-oxide nanocrystals are often highly active, rapid aggregation (particularly in water) generally precludes detailed solution-state investigation of their catalytic reactions. This is equally true for visible-light driven water oxidation by hematite α-Fe2O3 nanocrystals, that bridge a conceptual divide between molecular complexes of iron and solid-state hematite photoanodes. We now report that the aqueous solubility and remarkable stability of polyoxometalate- (POM-) complexed 275 iron-atom hematite cores make it possible to investigate visible-light driven water oxidation at this frontier area, by application of the versatile toolbox of solution-state methods typically reserved for molecular catalysis...
March 6, 2019: Angewandte Chemie
Songtao Tang, Mingyang Li, Duan Huang, Weitao Qiu, Shuang Xiao, Yexiang Tong, Shihe Yang
Constructing 3D nanophotonic structures is regarded as an effective means to realize both efficient light absorption and efficient charge separation. However, most of the 3D structures reported so far enhance light trapping beyond the absorption onset wavelength, and thus greatly attentuate or even completely block the long-wavelength light, which could otherwise be efficiently absorbed by narrow-bandgap materials in a Z-scheme or tandem device. In addition, constructing a 3D conductive substrate often involves complex processes causing increased cost and upscaling problems...
February 28, 2019: Small
Wei Wang, Lianjing Zhao, Yuan Wang, Weinan Xue, Fangfang He, Yiling Xie, Yan Li
A sufficient loading of pre-synthesized quantum dots (QDs) on mesoporous TiO2 electrodes is the prerequisite for the fabrication of high performance QD sensitized solar cells (QDSCs). Here, we provide a general approach for increasing QD loading on mesoporous TiO2 films by surface engineering. It was found that the zeta potential of pre-sensitized TiO2 can be effectively adjusted by surfactant treatment, on the basis of which additional QDs are successfully introduced onto photoanodes during secondary deposition...
February 24, 2019: Journal of the American Chemical Society
Zaki Zahran, Yuta Tsubonouchi, Eman Mohamed, Masayuki Yagi
Catalytic water oxidation represents the bottleneck for developing artificial photosynthetic systems that store solar energy as renewable fuels. A variety of molecular water oxidation catalysts (WOCs) were reported over the last two decades. In view of their applications to artificial photosynthetic devices, it is essential to immobilize molecular catalysts onto surfaces of conducting/semiconducting supports for fabricating efficient and stable water oxidation anodes/photoanodes. Molecular WOC based- anodes are essential for developing the photovoltaic (PV) type of artificial photosynthetic devices and, otherwise, the performance of molecular WOC on anodes will provide important insight into designing the extended molecular WOC-based photoanodes for photoelectrochemical (PEC) water oxidation...
February 21, 2019: ChemSusChem
Jin Hyun Kim, Jae Sung Lee
Photoelectrochemical (PEC) cells for solar-energy conversion have received immense interest as a promising technology for renewable hydrogen production. Their similarity to natural photosynthesis, utilizing sunlight and water, has provoked intense research for over half a century. Among many potential photocatalysts, BiVO4 , with a bandgap of 2.4-2.5 eV, has emerged as a highly promising photoanode material with a good chemical stability, environmental inertness, and low cost. Unfortunately, its charge transport properties are modest, at most a hole diffusion length (Lp ) of ≈70 nm...
February 21, 2019: Advanced Materials
Yuanxing Fang, Xiaochun Li, Xinchen Wang
Overcoming the sluggish kinetics of the water oxidation is the key to lead a high performance for solar water splitting. Herein, we find that phosphorylated polymeric carbon nitride (PCN) photoanodes present enhanced photocurrent density for solar water splitting, and the photocatalytic efficiency is achieved 120 µA/cm2 in basic solution (1.0 M NaOH) without scarifice agent. In this sytem, phosphates ionically anchor on the surface of PCN, and the modified films show significantly increased density of valance electrons, and thus promoting photoelectrocatalytic efficiency...
February 18, 2019: ChemSusChem
Liangping Gong, Jiale Xie, Xiaorong Liang, Jinyun Xiong, Shuanglian Yi, Xiaoyue Zhang, Chang Ming Li
Hematite (α-Fe2 O3 ) is the most promising photoanode with a high theoretical photocurrent of 12.6 mA cm-2 . However, the photocurrent of Fe2 O3 achieved now is far below its theoretical value, which is mainly due to its poor electronic conductivity and sluggish water oxidation kinetics. Herein, a co-doping method by sequential in-situ Ti-doping and ex-situ Mg-doping is used to tailor the surface states of Fe2 O3 photoanode for great improvement of the charge transfer at the interface and the followed transport ability by the suppressed charge recombination, resulting in about 11-folds and 6...
February 10, 2019: Journal of Colloid and Interface Science
Nina Lämmermann, Fabian Schmid-Michels, Aike Weißmann, Lutz Wobbe, Andreas Hütten, Olaf Kruse
Bio-dyes for light harvesting in dye-sensitized solar cells (DSSC) have the advantage of being environmentally-friendly, non-toxic alternatives, which can be produced in a sustainable fashion. Free photosynthetic pigments are unstable in the presence of light and oxygen, a situation which can hardly be avoided during the operation of DSSCs, especially in large-scale applications. We therefore investigated the recombinant light-harvesting protein LHCBM6, which naturally occurs in the photosynthetic apparatus of the green microalga Chlamydomonas reinhardtii as a bio-dye in DSSCs...
February 14, 2019: Scientific Reports
Yannick Hermans, Sebastián Murcia-López, Andreas Klein, Roel van de Krol, Teresa Andreu, Joan Ramón Morante, Thierry Toupance, Wolfram Jaegermann
The formation of heterostructures has proven to be a viable way to achieve high photoelectrochemical water splitting efficiencies with BiVO4 based photoanodes. Especially, cobalt and nickel based oxides are suitable low cost contact materials. However, the exact role of these contact materials is not yet completely understood because of the difficulty to individually quantify the effects of surface passivation, charge carrier separation and catalysis on the efficiency of a heterostructure. In this study, we used photoelectron spectroscopy in combination with in situ thin film deposition to obtain direct information on the interface structure between polycrystalline BiVO4 and NiO, CoOx and Sn-doped In2O3 (ITO)...
February 14, 2019: Physical Chemistry Chemical Physics: PCCP
Pawan Kumar, Ehsan Vahidzadeh, Ujwal Kumar Thakur, Piyush Kar, Kazi Mohammad Alam, Ankur Goswami, Najia Mahdi, Kai Cui, Guy M Bernard, Vladimir K Michaelis, Karthik Shankar
Modification of carbon nitride based polymeric 2D materials for tailoring their optical, electronic and chemical properties for various applications has gained significant interest. The present report demonstrates the synthesis of a novel modified carbon nitride framework with a remarkable 3:5 C:N stoichiometry (C3N5) and an electronic bandgap of 1.76 eV, by thermal deammoniation of melem hydrazine precursor. Characterization revealed that in C3N5 polymer, two s-heptazine units are bridged together with azo linkage, which constitutes an entirely new and different bonding fashion from g-C3N4 where three heptazine units are linked together with tertiary nitrogen...
February 14, 2019: Journal of the American Chemical Society
Jiang-Yang Shao, Yu-Wu Zhong
A cyclometalated ruthenium sensitizer 3 containing a triphenylamine unit was synthesized and immobilized on a nanocrystalline TiO2 surface. By using oxidative electrochemical deposition, a covalent layer of a related cyclometalated ruthenium complex 2 was coupled to the top of dye 3. Electrochemical studies suggested that complex 2 was immobilized on the TiO2 /3 film surface by a tetraphenylbenzidine linker to form a dimer-like structure. The immobilization of 3 and 2 was further supported by absorption spectral analysis...
February 13, 2019: Inorganic Chemistry
Sanghyun Bae, Hyunwoo Kim, Dasom Jeon, Jungki Ryu
We studied the kinetics of photoelectrochemical (PEC) water oxidation using a model photoanode BiVO4 modified with various water oxidation catalysts (WOCs) by electrochemical impedance spectroscopy (EIS). In particular, we prepared BiVO4 photoanodes with catalytic multilayers (CMs), where cationic polyelectrolytes and anionic polyoxometalate (POM) WOCs were assembled in a desired amount at a nanoscale precision, and compared their performance with those with well-known WOCs such as cobalt phosphate (CoPi) and NiOOH...
February 13, 2019: ACS Applied Materials & Interfaces
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