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Li Song, Tao Wang, Yiou Ma, Hairong Xue, Hu Guo, Xiaoli Fan, Wei Xia, Hao Gong, Jianping He
The scarcity, high cost and poor stability of precious metal-based electrocatalysts have stimulated the development of novel non-precious metal catalysts to oxygen reduction reaction (ORR) for the use in fuel cells and metal-air batteries. Here, we in-situ fabricated a hybrid material (Co-W-C/N) with functional species (tungsten carbide and cobalt nanoparticles) encapsulated in N-doped porous carbon framework, through a facile multi-constituents co-assembly method combined with subsequent annealing treatment...
December 7, 2016: Chemistry: a European Journal
Gastón O Larrazábal, Antonio J Martín, Frank Krumeich, Roland Hauert, Javier Pérez-Ramírez
The electroreduction of CO2 to fuels and chemicals is an attractive strategy for valorizing CO2 emissions. In this study, we show that a Cu2O electrocatalyst prepared by a simple and potentially scalable solvothermal route effectively targeted CO evolution at low to moderate overpotentials (CECO ca. 60% after 12 h at -0.6 V vs. RHE), and that the introduction of p-block elements (In, Sn, Ga, Al) into the catalyst can be employed to tune its selectivity. SEM, HRTEM, and voltammetric analyses revealed that the Cu2O catalyst undergoes extensive surface restructuring (favorable for CO evolution) under reaction conditions...
December 2, 2016: ChemSusChem
Sijie Guo, Siqi Zhao, Jin Gao, Cheng Zhu, Xiuqin Wu, Yijun Fu, Hui Huang, Yang Liu, Zhenhui Kang
Electrochemical reduction of CO2 is a key component of many prospective artificial technologies for renewable carbon-containing fuels, but it still suffers from the high overpotentials required to drive the process, low selectivity for diversiform products and the high cost of the catalyst. Here, we report that Cu-CDots nanocorals is a highly efficient, low-cost and stable electrocatalyst for CO2 reduction in aqueous solution. The major product of CO2 reduction on the Cu-CDots nanocorals is HCOOH with an inconceivable low overpotential of 0...
December 2, 2016: Nanoscale
Nitish Roy, Yuiri Hirano, Haruo Kuriyama, Pitchaimuthu Sudhagar, Norihiro Suzuki, Ken-Ichi Katsumata, Kazuya Nakata, Takeshi Kondo, Makoto Yuasa, Izumi Serizawa, Tomoaki Takayama, Akihiko Kudo, Akira Fujishima, Chiaki Terashima
Competitive hydrogen evolution and multiple proton-coupled electron transfer reactions limit photoelectrochemical CO2 reduction in aqueous electrolyte. Here, oxygen-terminated lightly boron-doped diamond (BDDL) thin films were synthesized as a semiconductor electron source to accelerate CO2 reduction. However, BDDL alone could not stabilize the intermediates of CO2 reduction, yielding a negligible amount of reduction products. Silver nanoparticles were then deposited on BDDL because of their selective electrochemical CO2 reduction ability...
November 28, 2016: Scientific Reports
Sang Keun Ha, Jeehye Sung, Inwook Choi, Yoonsook Kim
BACKGROUND: Rice (Oryza sativa) is a major cereal crop in many Asian countries and an important staple food source. Rice hulls have been reported to possess antioxidant activities. MATERIALS AND METHODS: In this study, we evaluated the antiinflammatory effects of rice hull extract and associated signal transduction mechanisms in lipopolysaccharide (LPS)-stimulated RAW 264.7 macrophages. RESULTS: We found that rice hull extract inhibited nitric oxide (NO) and prostaglandin E2 by suppressing the expression of inducible NO synthase and cyclooxygenase-2, respectively...
October 2016: Pharmacognosy Magazine
Qing Yu, Xianguang Meng, Li Shi, Huimin Liu, Jinhua Ye
In this study, superfine Ag nanoparticle decorated ultrathin Zn nanoplate electrodes were prepared for the reduction of CO2 to CO for the first time. With an extremely tiny amount of superfine 2 nm Ag nanoparticles uniformly deposited on the surface, the CO Faradaic efficiency for the Zn electrode doubled to 84% at about 0.8 V vs. RHE, while the CO current density increased 7 times to 1.89 mA cm(-2).
December 1, 2016: Chemical Communications: Chem Comm
Tatiana do Nascimento Pedrosa, Evelyne De Vuyst, Abdallah Mound, Catherine Lambert de Rouvroit, Silvya Stuchi Maria-Engler, Yves Poumay
Atopic dermatitis (AD) skin is characterized by over-expression of interleukin (IL)-4, IL-13 and IL-25. When methyl-β-cyclodextrin (MβCD) treatment preceded exposure to these interleukins, combination of both treatments was found to mimic hallmarks of AD in vitro, such as barrier weakening, histological alterations and typical signaling responses in a reconstructed human epidermis (RHE). However, the respective role of each IL and whether any of them is critical when combined with MβCD treatment was unknown...
November 11, 2016: Archives of Dermatological Research
Soon Woo Kwon, Ming Ma, Myung Jin Jeong, Kan Zhang, Sung June Kim, Jong Hyeok Park
Herein, we designed vertically aligned TiO2 nanotube arrays, in which a very thin disordered overlayer approximately a few nm thick was formed via a room-temperature solution process. At the optimal overlayer thickness, the TiO2 nanotube arrays yielded a photocurrent density of up to ∼1.75 mA cm(-2) at 1.23 V vs. RHE, approximately twice that of the pristine one.
November 10, 2016: Chemical Communications: Chem Comm
Xiangjun Zheng, Xuecheng Cao, Xiaowei Li, Jinghua Tian, Chao Jin, Ruizhi Yang
Nitrogen-doped carbon hollow cubes (NCHCs) are fabricated from biomass l-lysine monohydrochloride via a facile and low-cost NaCl template process, showing efficient bifunctional electrocatalytic activities towards the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). The resultant lysine-derived carbon hollow cubes with hierarchical pores on the wall are conducive to mass transport and high utilization of nitrogen dopant-induced active sites during the electrocatalytic process. When used as electrocatalysts for the ORR, an onset potential of 0...
November 8, 2016: Nanoscale
Zhifeng Liu, Lu Yan
Development of all oxide p-n junctions makes a significant advancement in photoelectrode catalysis functional materials. In this article, we report the preparation of TiO2 nanorod (NR)/Cu2O photoanodes via a simple hydrothermal method followed by an electrochemical deposition process. This facile synthesis route can simultaneously achieve uniform TiO2 NR/Cu2O composite nanostructures and obtain varied amounts of Cu2O by controlling the deposition time. The photocurrent density of TiO2 NR/Cu2O heterojunction photoanodes enhanced the photocatalytic activity with a photocurrent density of 5...
November 16, 2016: Physical Chemistry Chemical Physics: PCCP
Donghyeop Shin, Edgard Ngaboyamahina, Yihao Zhou, Jeffrey T Glass, David B Mitzi
Cu2BaSnS4-xSex films consisting of earth-abundant metals have been examined for photocathode application. Films with different Se contents (i.e., Cu2BaSnS4-xSex with x ≤ 2.4) were synthesized using a cosputter system with post-deposition sulfurization/selenization annealing treatments. Each film adopts a trigonal P31 crystal structure, with progressively larger lattice constants and with band gaps shifting from 2.0 to 1.6 eV, as more Se substitutes for S in the parent compound Cu2BaSnS4. Given the suitable bandgap and earth-abundant elements, the Cu2BaSnS4-xSex films were studied as prospective photocathodes for water splitting...
November 1, 2016: Journal of Physical Chemistry Letters
Hai-Yun Li, Cong-Yuan Cheng
OBJECTIVE: To understand the regularity of Rh blood typing of valunteary blood donors in Chinese Nanyang city, and to estabbish a Rh DC/c/E/e antigen negative donor base so as to provide the help for clinical emergent blood transfusion to patients and ensure the safety of blood transfusion. METHODS: The Rh D blood group of blood samples from 81462 voluntary blood donors in Chinese Nanyang city in 2014 was identified by serologic method; after first screening and confirmation, the RhE/e/C/c typing of Rh D negative samples was performed; the detailed infornation of donors was registered seriously by using unified creteria; the data base and base in kind of RhE/e/C/c types of valuntary donors were established by means of compater-mamayement system...
October 2016: Zhongguo Shi Yan Xue Ye Xue za Zhi
Bruno Fabre, Gaozeng Li, Francis Gouttefangeas, Loic Joanny, Gabriel Loget
The electroless deposition of Pt nanoparticles (NPs) on hydrogen-terminated silicon (H-Si) surfaces is studied as a function of temperature and the immersion time. It is demonstrated that isolated Pt structures can be produced at all investigated temperatures (between 22 and 75°C) for short deposition times, typically within 1-10 min if the temperature was 45°C or less than 5 min at 75°C. For longer times, dendritic metal structures start to grow leading ultimately to highly rough interconnected Pt networks...
October 25, 2016: Langmuir: the ACS Journal of Surfaces and Colloids
Keumnam Cho, Sung-Hwan Han, Myunghyun Paik Suh
To apply electrically nonconductive metal-organic frameworks (MOFs) in an electrocatalytic oxygen reduction reaction (ORR), we have developed a new method for fabricating various amounts of CuS nanoparticles (nano-CuS) in/on a 3D Cu-MOF, [Cu3 (BTC)2 ⋅(H2 O)3 ] (BTC=1,3,5-benzenetricarboxylate). As the amount of nano-CuS increases in the composite, the electrical conductivity increases exponentially by up to circa 10(9) -fold, while porosity decreases, compared with that of the pristine Cu-MOF. The composites, nano-CuS(x wt %)@Cu-BTC, exhibit significantly higher electrocatalytic ORR activities than Cu-BTC or nano-CuS in an alkaline solution...
October 24, 2016: Angewandte Chemie
Fengjiao Chen, Qishan Zhu, Yeyun Wang, Wei Cui, Xiaodong Su, Yanguang Li
Increasing attention has now been focused on the photoelectrochemical (PEC) hydrogen evolution as a promising route to transforming solar energy into chemical fuels. Silicon is one of the most studied PEC electrode materials, but its performance is still limited by its inherent PEC instability and electrochemical inertness toward water splitting. To achieve significant PEC activities, silicon-based photoelectrodes usually have to be coupled with proper cocatalysts, and thus, the formed semiconductor-cocatalyst interface presents a critical structural parameter in the rational design of efficient PEC devices...
November 1, 2016: ACS Applied Materials & Interfaces
Yong Yang, Mei Wang, Peili Zhang, Weihan Wang, Hongxian Han, Licheng Sun
Modification of p-type Si surface by active and stable earth-abundant electrocatalysts is an effective strategy to improve the sluggish kinetics for the hydrogen evolution reaction (HER) at p-Si/electrolyte interface and to develop highly efficient and low-cost photocathodes for hydrogen production from water. To this end, Si nanowire (Si-NW) array has been loaded with highly efficient electrocatalysts, M-B (M = Ni, Co), by facile and quick electroless plating to build M-B catalyst-modified Si nanowire-array-textured photocathodes for water reduction to H2...
October 28, 2016: ACS Applied Materials & Interfaces
Émilie Faway, Ludivine Cambier, Bernard Mignon, Yves Poumay, Catherine Lambert de Rouvroit
Dermatophytosis is a superficial fungal infection of keratinized structures that exhibits an increasing prevalence in humans and is thus requesting novel prophylactic strategies and therapies. However, precise mechanisms used by dermatophytes to adhere at the surface of the human epidermis and invade its stratum corneum are still incompletely identified, as well as the responses provided by the underlying living keratinocytes during the infection. We hereby report development of an in vitro model of human dermatophytosis through infection of reconstructed human epidermis (RHE) by arthroconidia of the anthropophilic Trichophyton rubrum species or of the zoophilic Microsporum canis and Arthroderma benhamiae species...
October 19, 2016: Medical Mycology: Official Publication of the International Society for Human and Animal Mycology
Yang Yang, Di Xu, Qingyong Wu, Peng Diao
Solar powered hydrogen evolution reaction (HER) is one of the key reactions in solar-to-chemical energy conversion. It is desirable to develop photocathodic materials that exhibit high activity toward photoelectrochemical (PEC) HER at more positive potentials because a higher potential means a lower overpotential for HER. In this work, the Cu2O/CuO bilayered composites were prepared by a facile method that involved an electrodeposition and a subsequent thermal oxidation. The resulting Cu2O/CuO bilayered composites exhibited a surprisingly high activity and good stability toward PEC HER, expecially at high potentials in alkaline solution...
October 17, 2016: Scientific Reports
Li An, Zhonghong Xia, Peikai Chen, Dingguo Xia
Transition metal oxynitrides have now garnered growing interest in our quest for highly efficient alternatives to Pt in direct methanol alkaline fuel cells. Herein, carbon supported Co3Mo2OxN6-x was synthesized via a simple two-step approach wherein the reactants undergo refluxing and heat treatment in NH3. For the as-prepared Co3Mo2OxN6-x catalyst, uniformly dispersed on the XC-72, with the particles size averaged at 5 nm, the catalytic activities towards oxygen reduction reaction in alkaline media are related to the commercial Pt/C, such as the comparable onset potential (0...
October 12, 2016: ACS Applied Materials & Interfaces
Minju Thomas, Rajith Illathvalappil, Sreekumar Kurungot, Balagopal N Nair, Abdul Azeez Peer Mohamed, Gopinathan M Anilkumar, Takeo Yamaguchi, U S Hareesh
Nitrogen containing mesoporous carbon obtained by the pyrolysis of graphene oxide (GO) wrapped ZIF-8 (Zeolitic Imidazolate Frameworks-8) micro crystals is demonstrated to be an efficient catalyst for the oxygen reduction reaction (ORR). ZIF-8 synthesis in the presence of GO sheets helped to realise layers of graphene oxide over ZIF-8 microcrystals and the sphere like structures thus obtained, on heat treatment, transformed to highly porous carbon with a nitrogen content of about 6.12 % and surface area of 502 m2/g...
October 12, 2016: ACS Applied Materials & Interfaces
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