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https://www.readbyqxmd.com/read/29616794/controllable-synthesis-of-nixse-0-5-%C3%A2-x-%C3%A2-1-nanocrystals-for-efficient-rechargeable-zinc-air-batteries-and-water-splitting
#1
Xuerong Zheng, Xiaopeng Han, Hui Liu, Jianjun Chen, Dongju Fu, Jihui Wang, Cheng Zhong, Yida Deng, Wenbin Hu
The development of earth-abundant, highly active, and corrosion-resistant electrocatalysts to promote the oxygen reduction reaction (ORR), and oxygen and hydrogen evolution reactions (OER/HER) for rechargeable metal-air batteries and water splitting devices is urgently needed. In this work, NixSe (0.5 ≤ x ≤1) nanocrystals with different crystal structures and compositions have been controllably synthesized and investigated as potential electrocatalysts for multifunctional ORR, OER and HER in alkaline conditions...
April 4, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29571215/molybdenum-carbide-decorated-metallic-cobalt-nitrogen-doped-carbon-polyhedrons-for-enhanced-electrocatalytic-hydrogen-evolution
#2
Can Wu, Dan Liu, Hui Li, Jinghong Li
Electrocatalytic hydrogen evolution reaction (HER) based on water splitting holds great promise for clean energy technologies, in which the key issue is exploring cost-effective materials to replace noble metal catalysts. Here, a sequential chemical etching and pyrolysis strategy are developed to prepare molybdenum carbide-decorated metallic cobalt@nitrogen-doped porous carbon polyhedrons (denoted as Mo/Co@N-C) hybrids for enhanced electrocatalytic hydrogen evolution. The obtained metallic Co nanoparticles are coated by N-doped carbon thin layers while the formed molybdenum carbide nanoparticles are well-dispersed in the whole Co@N-C frames...
April 2018: Small
https://www.readbyqxmd.com/read/29558102/ultrathin-graphdiyne-wrapped-iron-carbonate-hydroxide-nanosheets-toward-efficient-water-splitting
#3
Lan Hui, Dianzeng Jia, Huidi Yu, Yurui Xue, Yuliang Li
We employed a two-step strategy for preparing ultrathin graphdiyne-wrapped iron carbonate hydroxide nanosheets on nickel foam (FeCH@GDY/NF) as the efficient catalysts toward the electrical splitting water. The introduction of naturally porous GDY nanolayers on FeCH surface endows the pristine catalyst with structural advantages for boosting catalytic performances. Benefited from the protection of robust GDY nanolayers with intimate contact between GDY and FeCH, the combined material exhibits high long-term durability of 10 000 cycles for oxygen-evolution reaction (OER) and 9000 cycles for hydrogen evolution reaction (HER) in 1...
March 20, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29542284/nio-as-a-bifunctional-promoter-for-ruo-2-toward-superior-overall-water-splitting
#4
Jinlong Liu, Yao Zheng, Yan Jiao, Zhenyu Wang, Zhouguang Lu, Anthony Vasileff, Shi-Zhang Qiao
Conventional development of nanomaterials for efficient electrocatalysis is largely based on performance-oriented trial-and-error/iterative approaches, while a rational design approach at the atomic/molecular level is yet to be found. Here, inspired by a fundamental understanding of the mechanism for both oxygen and hydrogen evolution half reactions (OER/HER), a unique strategy is presented to engineer RuO2 for superior alkaline water electrolysis through coupling with NiO as an efficient bifunctional promoter...
April 2018: Small
https://www.readbyqxmd.com/read/29349907/accelerated-hydrogen-evolution-kinetics-on-nife-layered-double-hydroxide-electrocatalysts-by-tailoring-water-dissociation-active-sites
#5
Guangbo Chen, Tao Wang, Jian Zhang, Pan Liu, Hanjun Sun, Xiaodong Zhuang, Mingwei Chen, Xinliang Feng
Owing to its earth abundance, low kinetic overpotential, and superior stability, NiFe-layered double hydroxide (NiFe-LDH) has emerged as a promising electrocatalyst for catalyzing water splitting, especially oxygen evolution reaction (OER), in alkaline solutions. Unfortunately, as a result of extremely sluggish water dissociation kinetics (Volmer step), hydrogen evolution reaction (HER) activity of the NiFe-LDH is rather poor in alkaline environment. Here a novel strategy is demonstrated for substantially accelerating the hydrogen evolution kinetics of the NiFe-LDH by partially substituting Fe atoms with Ru...
March 2018: Advanced Materials
https://www.readbyqxmd.com/read/29298073/polydopamine-and-polydopamine-silane-hybrid-surface-treatments-in-structural-adhesive-applications
#6
Ngon T Tran, David P Flanagan, Joshua A Orlicki, Joseph L Lenhart, Kenneth L Proctor, Daniel B Knorr
Numerous studies have focused on the remarkable adhesive properties of polydopamine, which can bind to substrates with a wide range of surface energies, even under aqueous conditions. This behavior suggests that polydopamine may be an attractive option as a surface treatment in structural bonding applications, where good bond durability is required. Here, we assessed polydopamine as a surface treatment for bonding aluminum plates with an epoxy resin. A model epoxy adhesive consisting of diglycidyl ether of bisphenol A (DGEBA) and Jeffamine D230 polyetheramine was employed, and lap shear measurements (ASTM D1002 10) were made (i) under dry conditions to examine initial bond strength and (ii) after exposure to hot/wet (63 °C in water for 14 days) conditions to assess bond durability...
January 30, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29288828/the-effects-of-strawberry-tree-water-leaf-extract-arbutin-and-hydroquinone-on-haematological-parameters-and-levels-of-primary-dna-damage-in-white-blood-cells-of-rats
#7
Karlo Jurica, Irena Brčić Karačonji, Nevenka Kopjar, Ana Shek-Vugrovečki, Tihana Cikač, Vesna Benković
ETHNOPHARMACOLOGICAL RELEVANCE: Strawberry tree (Arbutus unedo L., Ericaceae) leaves represent a potent source of biologically active compounds and have been used for a long to relieve symptoms of various health impairments and diseases. Two major compounds related to their beneficial activities in animals and humans are arbutin and hydroquinone. AIM OF THE STUDY: To establish potential benefit/risk ratio associated with daily oral administration of strawberry tree water leaf extract, arbutin and hydroquinone in doses expected to be non-toxic...
April 6, 2018: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/29216593/phosphorus-and-nitrogen-limitation-and-impairment-of-headwater-streams-relative-to-rivers-in-great-britain-a-national-perspective-on-eutrophication
#8
Helen P Jarvie, Douglas R Smith, Lisa R Norton, Francois K Edwards, Michael J Bowes, Stephen M King, Peter Scarlett, Sian Davies, Rachael M Dils, Nuria Bachiller-Jareno
This study provides a first national-scale assessment of the nutrient status of British headwater streams within the wider river network, by joint analysis of the national Countryside Survey Headwater Stream and Harmonised River Monitoring Scheme datasets. We apply a novel Nutrient Limitation Assessment methodology to explore the extent to which nutrients may potentially limit primary production in headwater streams and rivers, by coupling ternary assessment of nitrogen (N), phosphorus (P), and carbon (C) depletion, with N:P stoichiometry, and threshold P and N concentrations...
April 15, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29182173/mn-doped-porous-cobalt-nitride-nanowires-with-high-activity-for-water-oxidation-under-both-alkaline-and-neutral-conditions
#9
Yiqiang Sun, Tao Zhang, Xinyang Li, Dilong Liu, Guangqiang Liu, Xiaomin Zhang, Xianjun Lyu, Weiping Cai, Yue Li
We report the successful synthesis of Mn doped CoN nanowires on a carbon fiber cloth substrate (CFC) by a two-step strategy, which can be used as an efficient and stable OER electrocatalyst under both alkaline and neutral conditions. Benefiting from enhanced electronic interaction, high active area and electrical conductivity, the Mn doped CoN nanowires/CFC exhibits enhanced kinetics and improved cycling stability for the OER under both alkaline and neutral conditions. To achieve a current density of 10 mA cm-2 , the Mn doped CoN nanowires/CFC requires an overpotential of 265 mV in alkaline solution and 285 mV in neutral solution...
December 12, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29171706/controllable-surface-reorganization-engineering-on-cobalt-phosphide-nanowire-arrays-for-efficient-alkaline-hydrogen-evolution-reaction
#10
Kun Xu, Han Cheng, Haifeng Lv, Jingyu Wang, Linqi Liu, Si Liu, Xiaojun Wu, Wangsheng Chu, Changzheng Wu, Yi Xie
Developing highly efficient hydrogen evolution reaction (HER) catalysts in alkaline media is considered significant and valuable for water splitting. Herein, it is demonstrated that surface reorganization engineering by oxygen plasma engraving on electocatalysts successfully realizes a dramatically enhanced alkaline HER activity. Taking CoP nanowire arrays grown on carbon cloth (denoted as CoP NWs/CC) as an example, the oxygen plasma engraving can trigger moderate CoOx species formation on the surface of the CoP NWs/CC, which is visually verified by the X-ray absorption fine structure, high-resolution transmission electron microscopy, and energy-dispersive spectrometer (EDS) mapping...
January 2018: Advanced Materials
https://www.readbyqxmd.com/read/29152698/characterization-and-valorization-of-biomass-char-a-comparison-with-biomass-ash
#11
Nikhilesh S Trivedi, Sachin A Mandavgane, Ashish Chaurasia
Organic matter derived from living, or recently living plant and animal, which can be used as fuel is called as biomass. It includes wood and agricultural waste such as dead plant etc. In India, majority of population depends largely upon agriculture as their primary source of income. Following every harvest, a huge amount of biomass is generated. It is mostly discarded as "agro waste"; however, recently, several uses of biomass and its derivatives have been reported. Thermochemical processing of biomass in absence of oxygen produces biomass char and flue gases which are of economic importance...
February 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29135981/pioneer-cells-established-by-the-swi-prion-can-promote-dispersal-and-out-crossing-in-yeast
#12
Gregory A Newby, Susan Lindquist
To thrive in an ever-changing environment, microbes must widely distribute their progeny to colonize new territory. Simultaneously, they must evolve and adapt to the stresses of unpredictable surroundings. In both of these regards, diversity is key-if an entire population moved together or responded to the environment in the same way, it could easily go extinct. Here, we show that the epigenetic prion switch [SWI+] establishes a specialized subpopulation with a "pioneer" phenotypic program in Saccharomyces cerevisiae...
November 2017: PLoS Biology
https://www.readbyqxmd.com/read/29063927/dealloying-directed-synthesis-of-efficient-mesoporous-cofe-based-catalysts-towards-the-oxygen-evolution-reaction-and-overall-water-splitting
#13
Lulu Han, Chaoqun Dong, Chi Zhang, Yulai Gao, Jie Zhang, Hui Gao, Ying Wang, Zhonghua Zhang
It is a great challenge to design highly active, stable and low-cost catalysts for electrochemically splitting water to realize the clean energy generation and renewable energy storage. Herein, a facile one-step dealloying strategy was proposed to synthesize mesoporous CoFe-based oxides and layered double hydroxides (LDHs). Benefitting from the fast mass transfer and more active sites caused by the open mesoporous structure, the CoFe-based materials exhibit excellent electrocatalytic activities and stability towards the oxygen evolution reaction (OER) in an alkaline electrolyte (1 M KOH)...
November 2, 2017: Nanoscale
https://www.readbyqxmd.com/read/29057652/amorphous-co2b-grown-on-cose2-nanosheets-as-a-hybrid-catalyst-for-efficient-overall-water-splitting-in-alkaline-medium
#14
Yaxiao Guo, Zhaoyang Yao, Changshuai Shang, Erkang Wang
In this work, we synthesized a novel hybrid catalyst (Co2B/CoSe2) by growing amorphous Co2B on the surface of CoSe2 nanosheets. Benefiting from the prominent coupled effects between Co2B and CoSe2 nanosheets, an efficient oxygen evolution reaction catalyst Co2B/CoSe2 exhibits a very low overpotential of 320 mV @ 10 mA cm(-2) with a Tafel slope of 56.0 mV dec(-1) in alkaline medium. An overpotential of 300 mV can also be achieved by Co2B/CoSe2 at the same condition for hydrogen evolution reaction. Notably, at the applied potential of 1...
October 31, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28988320/nanoscale-zero-valent-iron-functionalized-posidonia-oceanica-marine-biomass-for-heavy-metal-removal-from-water
#15
Saber Boubakri, Mohamed Amine Djebbi, Zaineb Bouaziz, Philippe Namour, Abdesslem Ben Haj Amara, Ibtissem Ghorbel-Abid, Rafik Kalfat
Because of the excellent reducing capacity of nanoscale zero-valent iron (NZVI), it can be used as alternative materials for the removal of a variety of reducible water contaminants including toxic metals. The current paper reports the research results obtained for self-prepared biosorbent, Posidonia oceanica biomass, activated in alkaline medium and functionalized with NZVI particles. The structural characteristics, surface morphology, and binding properties of the resulting nanobiosorbent are presented. Batch comparative adsorption trials including adsorption kinetics and isothermals onto raw Posidonia, Posidonia-OH and Posidonia-OH-NZVI were investigated on three heavy metal ions: Cd(II), Pb(II), and Cu(II)...
December 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28885008/metallic-transition-metal-selenide-holey-nanosheets-for-efficient-oxygen-evolution-electrocatalysis
#16
Zhiwei Fang, Lele Peng, Haifeng Lv, Yue Zhu, Chunshuang Yan, Shengqi Wang, Pranav Kalyani, Xiaojun Wu, Guihua Yu
Catalysts for oxygen evolution reaction (OER) are pivotal to the scalable storage of sustainable energy by means of converting water to oxygen and hydrogen fuel. Designing efficient electrocatalysis combining the features of excellent electrical conductivity, abundant active surface, and structural stability remains a critical challenge. Here, we report the rational design and controlled synthesis of metallic transition metal selenide NiCo2Se4-based holey nanosheets as a highly efficient and robust OER electrocatalyst...
September 26, 2017: ACS Nano
https://www.readbyqxmd.com/read/28880991/a-comparison-of-alkaline-water-and-mediterranean-diet-vs-proton-pump-inhibition-for-treatment-of-laryngopharyngeal-reflux
#17
COMPARATIVE STUDY
Craig H Zalvan, Shirley Hu, Barbara Greenberg, Jan Geliebter
Importance: Laryngopharyngeal reflux (LPR) is a common disorder with protean manifestations in the head and neck. In this retrospective study, we report the efficacy of a wholly dietary approach using alkaline water, a plant-based, Mediterranean-style diet, and standard reflux precautions compared with that of the traditional treatment approach of proton pump inhibition (PPI) and standard reflux precautions. Objective: To determine whether treatment with a diet-based approach with standard reflux precautions alone can improve symptoms of LPR compared with treatment with PPI and standard reflux precautions...
October 1, 2017: JAMA Otolaryngology—Head & Neck Surgery
https://www.readbyqxmd.com/read/28845976/from-chlorella-to-nestlike-framework-constructed-with-doped-carbon-nanotubes-a-biomass-derived-high-performance-bifunctional-oxygen-reduction-evolution-catalyst
#18
Guanghua Wang, Yijie Deng, Jinnan Yu, Long Zheng, Li Du, Huiyu Song, Shijun Liao
The development of effective bifunctional catalysts for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is significant for energy conversion systems, such as Li-air batteries, fuel cells, and water splitting technologies. Herein, a Chlorella-derived catalyst with a nestlike framework, composed of bamboolike nanotubes that encapsulate cobalt nanoparticles, has been prepared through a facile pyrolysis process. It achieves perfect bifunctional catalysis both in ORR and OER on a single catalyst...
September 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28833679/self-templated-fabrication-of-moni4-moo3-x-nanorod-arrays-with-dual-active-components-for-highly-efficient-hydrogen-evolution
#19
Yu-Yun Chen, Yun Zhang, Xing Zhang, Tang Tang, Hao Luo, Shuai Niu, Zhi-Hui Dai, Li-Jun Wan, Jin-Song Hu
A binder-free efficient MoNi4 /MoO3-x nanorod array electrode with 3D open structure is developed by using Ni foam as both scaffold and Ni source to form NiMoO4 precursor, followed by subsequent annealing in a reduction atmosphere. It is discovered that the self-templated conversion of NiMoO4 into MoNi4 nanocrystals and MoO3-x as dual active components dramatically boosts the hydrogen evolution reaction (HER) performance. Benefiting from high intrinsic activity, high electrochemical surface area, 3D open network, and improved electron transport, the resulting MoNi4 /MoO3-x electrode exhibits a remarkable HER activity with extremely low overpotentials of 17 mV at 10 mA cm(-2) and 114 mV at 500 mA cm(-2) , as well as a superior durability in alkaline medium...
August 18, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28772926/markedly-enhanced-surface-hydroxyl-groups-of-tio%C3%A2-nanoparticles-with-superior-water-dispersibility-for-photocatalysis
#20
Chung-Yi Wu, Kuan-Ju Tu, Jin-Pei Deng, Yu-Shiu Lo, Chien-Hou Wu
The benefits of increasing the number of surface hydroxyls on TiO₂ nanoparticles (NPs) are known for environmental and energy applications; however, the roles of the hydroxyl groups have not been characterized and distinguished. Herein, TiO₂ NPs with abundant surface hydroxyl groups were prepared using commercial titanium dioxide (ST-01) powder pretreated with alkaline hydrogen peroxide. Through this simple treatment, the pure anatase phase was retained with an average crystallite size of 5 nm and the surface hydroxyl group density was enhanced to 12...
May 22, 2017: Materials
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