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Jinlong Gong, Xiaoxia Chang, Tuo Wang, Zhijian Zhao, Piaoping Yang, Jeffrey Greeley, Rentao Mu, Gong Zhang, Zhongmiao Gong, Zhibin Luo, Jun Chen, Yi Cui, Geoffrey Ozin
Artificial photosynthesis can store solar energy and reduce CO2 into fuels to potentially alleviate global warming and energy crisis. Compared to gas products, it remains a grand challenge to tune the product distribution of artificial photosynthesis to liquid fuels, such as CH3OH, that are suitable for storage and transport. This paper describes the introduction of metallic Cu nanoparticles (NPs) on Cu2O films to change the product distribution from gas products on bare Cu2O to predominant CH3OH via CO2 reduction in aqueous solutions...
October 17, 2018: Angewandte Chemie
Guiming Peng, Josep Albero, Hermenegildo Garcia, Menny Shalom
Here we report a simple method to grow a closely-packed carbon nitride (CN) film by the crystallization of CN monomers on a conductive substrate followed by a thermal condensation. The as-synthesized CN exhibits excellent performance as photoanode material in photoelectrochemical cell. Detailed (photo)electrochemical and transient absorption measurements indicate excellent charge separation properties, high hole-extraction efficiency (up to 50%), a long electron lifetime, and low amount of defect states below the CN conduction band...
October 16, 2018: Angewandte Chemie
Ruyi Wang, Xiaodong Li, Lu Wang, Xirui Zhao, Guangcheng Yang, Aidong Li, Congping Wu, Qing Shen, Yong Zhou, Zhigang Zou
ZnO/CdS-based nanorod arrays (NRs) are an excellent class of photoanode materials, which possess high photoelectric response for solar-driven water splitting. A highly efficient photoanode system consisting of Al-doped ZnO NRs as effective electron-transfer layers and CdS as a light harvesting layer was rationally designed. Al doping increased the conductivity of ZnO NRs and simultaneously coarsened the surface of ZnO due to expansion of ZnO lattice. The rough surface favoured the growth of a CdS coating layer on it through a successive ionic layer adsorption reaction...
October 16, 2018: Nanoscale
Robert Godin, Takashi Hisatomi, Kazunari Domen, James R Durrant
A persistent challenge for the widespread deployment of solar fuels is the development of high efficiency photocatalysts combined with a low-cost preparation and implementation route. Since its discovery in 2005, GaN:ZnO solid solution has been a benchmark overall water splitting photocatalyst. Notably, GaN:ZnO functionalised with an appropriate proton reduction cocatalyst is one of the few particulate photocatalyst systems that can generate hydrogen and oxygen directly from water using visible light. However, the reasons underlying the remarkable visible light activity of GaN:ZnO are not well understood and photophysical studies of GaN:ZnO have been limited to date...
October 14, 2018: Chemical Science
Aijuan Liu, Chunyong Zhang, Yongcheng Zhu, Kezhen Li, Jie Huang, Yukou Du, Ping Yang
Herein, we report a novel nanocomposite consisting of n-type Sn-doped hematite and p-type CaMn2 O4 nanowire (CaMn2 O4 /α-Fe2 O3 ). The nanocomposite was characterized by X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), ultraviolet-visible absorption spectroscopy, X-ray photoelectron spectroscopy (XPS), which showed that nanospindle-like Sn-doped hematite and CaMn2 O4 nanowire contact intimately in the nanocomposite, resulting in efficient charge transfer and separation. Photoelectrochemical results reveal that the nanocomposite possesses higher donor density, enhanced conductivity and lower overpotential for dioxygen evolution...
October 1, 2018: Journal of Colloid and Interface Science
Yang Woo Lee, Passarut Boonmongkolras, Eun Jin Son, Jinhyun Kim, Sahng Ha Lee, Su Keun Kuk, Jong Wan Ko, Byungha Shin, Chan Beum Park
Redox enzymes catalyze fascinating chemical reactions with excellent regio- and stereo-specificity. Nicotinamide adenine dinucleotide cofactor is essential in numerous redox biocatalytic reactions and needs to be regenerated because it is consumed as an equivalent during the enzymatic turnover. Here we report on unbiased photoelectrochemical tandem assembly of a photoanode (FeOOH/BiVO4 ) and a perovskite photovoltaic to provide sufficient potential for cofactor-dependent biocatalytic reactions. We obtain a high faradaic efficiency of 96...
October 11, 2018: Nature Communications
Shiman He, Yuying Meng, Qili Wu, Jingling Yang, Senchuan Huang, Xiaohui Li, Shengfu Tong, Tewodros Asefa, Mingmei Wu
Owing to its excellent chemical stability and low cost, titanium dioxide (TiO2) has been widely studied as a photoanode for photoelectrochemical (PEC) water splitting. However, TiO2's practical applications in solar energy-to-synthetic fuel conversion processes have been constrained by its inherently poor ability to transport photogenerated electrons and holes. In this paper, we report Ta-doped porous TiO2 nanorod arrays on Ta foil (Ta-PTNA) that do not possess this issue and that can thus efficiently photoelectrocatalyze water oxidation, helping the production of H2 (a clean fuel) from water at the expense of solar light...
October 11, 2018: Nanoscale
Yotam Y Avital, Hen Dotan, Dino Klotz, Daniel A Grave, Anton Tsyganok, Bhavana Gupta, Sofia Kolusheva, Iris Visoly-Fisher, Avner Rothschild, Arik Yochelis
H2 O2 is a sacrificial reductant that is often used as a hole scavenger to gain insight into photoanode properties. Here we show a distinct mechanism of H2 O2 photo-oxidation on haematite (α-Fe2 O3 ) photoanodes. We found that the photocurrent voltammograms display non-monotonous behaviour upon varying the H2 O2 concentration, which is not in accord with a linear surface reaction mechanism that involves a single reaction site as in Eley-Rideal reactions. We postulate a nonlinear kinetic mechanism that involves concerted interaction between adions induced by H2 O2 deprotonation in the alkaline solution with adjacent intermediate species of the water photo-oxidation reaction, thereby involving two reaction sites as in Langmuir-Hinshelwood reactions...
October 9, 2018: Nature Communications
Ivan Grigioni, Mohamed Abdellah, Annamaria Corti, Maria Vittoria Dozzi, Leif Hammarström, Elena Selli
The dynamics of photopromoted electrons in BiVO4 , WO3 , and WO3 /BiVO4 heterojunction electrodes has been directly probed by transient absorption (TA) midinfrared (mid-IR) spectroscopy in the picosecond to microsecond time range. By comparison of the dynamics recorded with the two individual oxides at 2050 cm-1 with that of the heterojunction system after excitation at different wavelengths, electron-transfer processes between selectively excited BiVO4 and WO3 have been directly tracked for the first time...
October 18, 2018: Journal of the American Chemical Society
Noradiba Nordin, Li-Ngee Ho, Soon-An Ong, Abdul Haqi Ibrahim, Sin-Li Lee, Yong-Por Ong
The hybrid system of photocatalytic fuel cell - peroxi-coagulation (PFC-PC) is a sustainable and green technology to degrade organic pollutants and generate electricity simultaneously. In this study, three different types of photocatalysts: TiO2 , ZnO and α-Fe2 O3 were immobilized respectively on carbon cloth (CC), and applied as photoanodes in the photocatalytic fuel cell of this hybrid system. Photocatalytic fuel cell was employed to drive a peroxi-coagulation process by generating the external voltage accompanying with degrading organic pollutants under UV light irradiation...
September 28, 2018: Chemosphere
Haijiao Lu, Virgil Andrei, Kellie J Jenkinson, Anna Regoutz, Ning Li, Charles E Creissen, Andrew E H Wheatley, Hongxun Hao, Erwin Reisner, Dominic S Wright, Sebastian D Pike
Single-source precursors are used to produce nanostructured BiVO4 photoanodes for water oxidation in a straightforward and scalable drop-casting synthetic process. Polyoxometallate precursors, which contain both Bi and V, are produced in a one-step reaction from commercially available starting materials. Simple annealing of the molecular precursor produces nanocrystalline BiVO4 films. The precursor can be designed to incorporate a third metal (Co, Ni, Cu, or Zn), enabling the direct formation of doped BiVO4 films...
October 4, 2018: Advanced Materials
Ryan T Pekarek, Kara Kearney, Benjamin M Simon, Elif Ertekin, Angus A Rockett, Michael J Rose
The design and fabrication of stable and efficient photoelectrochemical devices requires the use of multifunctional structures with complex heterojunctions composed of semiconducting, protecting, and catalytic layers. Understanding charge transport across such devices is challenging due to the interplay of bulk and interfacial properties. In this work, we analyze hole transfer across n-Si(111)- R|TiO2 photoanodes where - R is a series of mixed aryl/methyl monolayers containing an increasing number of methoxy units (mono, di, and tri)...
October 17, 2018: Journal of the American Chemical Society
Kiwon Kim, Jun Hyuk Moon
A photoanode capable of high-efficiency water oxidation at low bias potential is essential for its practical application for photocathode-coupled tandem systems. To address this issue, a photoanode with low turn-on voltage for water oxidation and high charge separation efficiency at low bias potential is essential. In this study, we demonstrate the photoanode of the BiVO4 /ZnO three-dimensional (3D) bicontinuous (BC) structure. ZnO has a relatively cathodic flat-band potential, which leads to low turn-on potential; the BiVO4 /ZnO 3D BC photoanode shows an onset potential of 0...
October 10, 2018: ACS Applied Materials & Interfaces
Xuefeng Long, Feng Li, Lili Gao, Yiping Hu, Haiguo Hu, Jun Jin, Jiantai Ma
The wide bandgap and high photogenerated carriers recombination rate of a promising semiconductor (ZnO) limit its application in the field of photoelectrochemical water splitting. To overcome these shortcomings, we adopt heterojunction and oxygen vacancy construction strategies by anchoring CoOx nanoparticles with abundant oxygen vacancies on ZnO nanorod arrays using facile and inexpensive synthesis methods, such as the spin coating-and-calcination and solvothermal method. In this photoanode, CoOx not only contacts with ZnO to establish p-n heterojunction that facilitates the photogenerated carriers separation, but also decreases water oxidation barrier as a co-catalyst...
September 28, 2018: ChemSusChem
Linsen Li, Jinhua Li, Jing Bai, Qingyi Zeng, Ligang Xia, Yan Zhang, Shuai Chen, Qunjie Xu, Baoxue Zhou
In this paper, a high-performance BiVO4 photoanode deposited with serial hole transfer layers was fabricated for photoelectrochemical (PEC) water splitting in order to overcome the shortcomings of pure BiVO4 electrodes in terms of poor charge transport properties and undesirable surface water oxidation kinetics. The hole transfer layer of Fe2O3 was first deposited on the surface of pure BiVO4 to promote the hole transfer from the bulk of the semiconductor to the electrode surface (bulk/surface transfer process), and then the hole transfer layer of NiOOH/FeOOH was deposited on the surface to improve the hole transfer from the electrode surface to the electrolyte (surface/electrolyte transfer process)...
October 4, 2018: Nanoscale
Aparajita Das, Sathish Deshagani, Raj Kumar, Melepurath Deepa
Photo-supercapacitors (PSCs) combine functions of energy harvesting and storage in a single device, and in this study, a new architecture for a PSC is designed and implemented. Cadmium sulfide (CdS) quantum dots (QDs)/hibiscus (hb) dye co-sensitized TiO2 is used as the solar cell. Poly(3,4-ethylenedioxypyrrole) (PEDOP)@manganese dioxide (MnO2) is employed as the counter electrode (CE) for the solar cell, and also as the electrodes for the symmetric supercapacitor. The two ends of a long flat current collector support two spatially separated PEDOP@MnO2 coatings, which serve as the CEs for the TiO2/hb/CdS photoanode and yet another PEDOP@MnO2 electrode in sandwich configurations...
September 25, 2018: ACS Applied Materials & Interfaces
Mengyuan Zhang, Rajini P Antony, Sing Yang Chiam, Fatwa Firdaus Abdi, Lydia Helena Wong
Solar water oxidation is considered as one of the most promising methods to utilize solar energy efficiently, and bismuth vanadate (BiVO4) is a potential photoanode. Catalyst loading on BiVO4 is often used to tackle the limitations of charge recombination and sluggish kinetics. In this study, amorphous nickel oxide (NiOx) is loaded on BiVO4 by photochemical metal organic deposition method. The resulting NiOx/Mo:BiVO4 photoanodes demonstrates a 2-fold improvement of photocurrent density of 2.44 mA cm-2 at 1...
September 24, 2018: ChemSusChem
Ming-Wei Kee, Jian-Wen Soo, Sze-Mun Lam, Jin-Chung Sin, Abdul Rahman Mohamed
Recycling of alternative water sources particularly greywater and recovery of energy from wastewater are gaining momentum due to clean water scarcity and energy crisis. In this study, the photocatalytic fuel cell (PFC) employing ZnO/Zn photoanode and CuO/Cu photocathode was successfully designed for effective greywater recycling as well as energy recovery. The photoelectrodes were analyzed using X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), energy dispersive X-ray (EDX) and fourier transform infrared (FTIR) spectroscopy...
September 19, 2018: Journal of Environmental Management
Mohammed Panthakkal Abdul Muthalif, Chozhidakath Damodharan Sunesh, Youngson Choe
The photovoltaic performance of quantum dot sensitized solar cells (QDSSCs) is limited due to charge recombination processes at the photoelectrode/electrolyte interfaces. We analyzed the effect of Sn4+ ion incorporation into CdS quantum dots (QDs) deposited onto TiO2 substrates in terms of enhancing light absorption and retarding electron-hole recombination at the TiO2 /QDs/electrolyte interfaces. Sensitization involved depositing CdS QDs with different Sn4+ concentrations on the surface of TiO2 using a facile and cost-effective successive ionic layer adsorption and reaction (SILAR) method...
September 12, 2018: Journal of Colloid and Interface Science
Dongting Wang, Shangheng Liu, Mingfa Shao, Jinghan Zhao, Yukun Gu, Qiuyi Li, Xianxi Zhang, Jinsheng Zhao, Yuzhen Fang
Hierarchical SnO₂ nanocrystallites aggregates (NAs) were prepared with a simple room temperature⁻based aqueous solution method followed by simple freeze-drying treatment. The as-prepared SnO₂ NAs were subsequently combined with SnO₂ nanosheet⁻based structures from the viewpoint of a function-matching strategy, and under an optimized condition, a power conversion efficiency (PCE) of 5.59% was obtained for the resultant hybrid photoanode, a remarkable 60% enhancement compared to that of dye-sensitized solar cells (DSCs) fabricated with bare SnO₂ NAs architecture...
September 19, 2018: Materials
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