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Hui Li, Qi Li, Peng Wen, Trey B Williams, Shiba Adhikari, Chaochao Dun, Chang Lu, Dominique Itanze, Lin Jiang, David L Carroll, George L Donati, Pamela M Lundin, Yejun Qiu, Scott M Geyer
Highly efficient and stable electrocatalysts, particularly those that are capable of multifunctionality in the same electrolyte, are in high demand for the hydrogen evolution reaction (HER), oxygen evolution reaction (OER), and oxygen reduction reaction (ORR). In this work, highly monodisperse CoP and Co2 P nanocrystals (NCs) are synthesized using a robust solution-phase method. The highly exposed (211) crystal plane and abundant surface phosphide atoms make the CoP NCs efficient catalysts toward ORR and HER, while metal-rich Co2 P NCs show higher OER performance owing to easier formation of plentiful Co2 P@COOH heterojunctions...
January 15, 2018: Advanced Materials
Yefei Li, Zhi-Pan Liu
Seeking for active MnOx material as artificial water splitting catalyst has been a long history since the discovery of PSII system in Nature. To date, the highest activity MnOx catalyst reported for oxygen evolution reaction (OER) is however not common MnO2 polymorphs (α-, β-, δ-MnO2), but nascent δ-MnO2 layer produced in situ from spinel under electrochemical conditions with unknown active site structure. Here with the stochastic surface walking (SSW) pathway sampling method, we for the first time resolve the atomic-level mechanism of spinel-to-layer Mn3O4 solid phase transition in aqueous electrolyte...
January 15, 2018: Journal of the American Chemical Society
Xin Xiao, Dekang Huang, Yong Qing Richard Fu, Ming Wen, Xingxing Jiang, Xiaowei Lv, Man Li, Lin Gao, Shuangshuang Liu, Mingkui Wang, Chuan Zhao, Yan Shen
Developing high-active and low-cost bifunctional materials for catalyzing hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) holds pivotal role in water splitting. Therefore, we present a new strategy to form NiS/Ni2P heterostructures. The as-obtained NiS/Ni2P/CC requires overpotentials of 111 mV for the HER and 265 mV for the OER to reach a current density of 20 mA cm-2, outperforming their counterparts such as NiS and Ni2P under the same conditions. Additionally, the NiS/Ni2P/CC electrode requires a 1...
January 15, 2018: ACS Applied Materials & Interfaces
Yingpu Bi, Beibei Zhang, Lei Wang, Yajun Zhang, Yong Ding
Photoelectrochemical (PEC) water splitting is a promising method for storing solar energy in the form of hydrogen fuel, but greatly hindered by the sluggish kinetics of the oxygen evolution reaction (OER). Herein, a facile solution impregnation method is developed for growing highly crystalline β-FeOOH nanolayers with ultrathin thickness (2 nm) and abundant oxygen vacancies on BiVO4 photoanodes, which exhibited a remarkable photocurrent density of 4.3 mA cm-2 at 1.23 V (vs. reversible hydrogen electrode (RHE), AM 1...
January 14, 2018: Angewandte Chemie
Laurent Liardet, Xile Hu
The water-splitting reaction provides a promising mechanism to store renewable energies in the form of hydrogen fuel. The oxidation half-reaction, the oxygen evolution reaction (OER), is a complex four-electron process that constitutes an efficiency bottleneck in water splitting. Here we report a highly active OER catalyst, cobalt vanadium oxide. The catalyst is designed on the basis of a volcano plot of metal-OH bond strength and activity. The catalyst can be synthesized by a facile hydrothermal route. The most active pure-phase material (a-CoVO x ) is X-ray amorphous and provides a 10 mA cm-2 current density at an overpotential of 347 mV in 1 M KOH electrolyte when immobilized on a flat substrate...
January 5, 2018: ACS Catalysis
Jingrui Han, Shuai Hao, Zhiang Liu, Abdullah M Asiri, Xuping Sun, Yuanhong Xu
Exploitation of efficient and earth-abundant electrocatalysts for the oxygen evolution reaction (OER) is of great importance. Herein, we report that the formation of an amorphous Mn-Co-P shell on MnCo2O4 can boost its OER activity in alkaline media. The core-shell Mn-Co-P@MnCo2O4 nanowire array on Ti mesh (Mn-Co-P@MnCo2O4/Ti) shows excellent electrochemical catalytic activity and requires an overpotential of 269 mV to drive 10 mA cm-2 in 1.0 M KOH, which is 93 mV less than that for the MnCo2O4 nanoarray. Notably, this catalyst also shows strong long-term electrochemical durability with its activity being maintained for at least 100 h and achieves a high turnover frequency of 1...
January 12, 2018: Chemical Communications: Chem Comm
Lotte van Dammen, Vincent Wekker, Anne M van Oers, Meike A Q Mutsaerts, Rebecca C Painter, Aeilko H Zwinderman, Henk Groen, Cornelieke van de Beek, Anneke C Muller Kobold, Walter K H Kuchenbecker, Ron van Golde, Gerrit J E Oosterhuis, Niels E A Vogel, Ben Willem J Mol, Tessa J Roseboom, Annemieke Hoek
BACKGROUND: The prevalence of obesity, an important cardiometabolic risk factor, is rising in women. Lifestyle improvements are the first step in treatment of obesity, but the success depends on factors like timing and motivation. Women are especially receptive to advice about lifestyle before and during pregnancy. Therefore, we hypothesize that the pre-pregnancy period provides the perfect window of opportunity to improve cardiometabolic health and quality of life of obese infertile women, by means of a lifestyle intervention...
2018: PloS One
Wei Sun, Zhiqiang Wang, Waqas Qamar Zaman, Zhenhua Zhou, Limei Cao, Xue-Qing Gong, Ji Yang
The lattice strain of IrO2 plays a critical role in determining its OER activity. The Ir-O bond length change in IrO6 coordination induces lattice strain. Increasing the annealing temperature results in a stretching strain along the c axis and a compressive strain on the a and b axes, leading to a larger c/a ratio. Enhancing the lattice strain decreases the c/a ratio, which is beneficial for improving OER activity.
January 11, 2018: Chemical Communications: Chem Comm
Xiao Liu, Hao Gong, Tao Wang, Hu Guo, Li Song, Wei Xia, Bin Gao, Zhongyi Jiang, Linfei Feng, Jianping He
Perovskite-type oxides based on alkaline-earth containing lanthanum manganate are the promising catalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in alkaline electrolyte. The perovskite-type LaMnO3 shows excellent ORR performance but poor OER activity. In order to improve OER performance of LaMnO3, the element Co is doped into the perovskite-type LaMnO3 via a sol-gel method with following calcination process. To assess electrocatalytic activities for ORR and OER, a series of prepared LaMn1-xCoxO3 (x = 0, 0...
January 10, 2018: Chemistry, An Asian Journal
Teng Liu, Fulin Yang, Gongzhen Cheng, Wei Luo
Searching for highly efficient bifunctional electrocatalysts for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) using nonnoble metal-based catalysts is essential for the development of many energy conversion systems, including rechargeable fuel cells and metal-air batteries. Here, Co9-x Fex S8 /Co,Fe-N-C hybrids wrapped by reduced graphene oxide (rGO) (abbreviated as S-Co9-x Fex S8 @rGO) are synthesized through a semivulcanization and calcination method using graphene oxide (GO) wrapped bimetallic zeolite imidazolate framework (ZIF) Co,Fe-ZIF (CoFe-ZIF@GO) as precursors...
January 10, 2018: Small
Yuxiao Ding, Alexander Klyushin, Xing Huang, Travis Jones, Detre Teschner, Frank Girgsdies, Tania Rodenas, Robert Schlögl, Saskia Heumann
By taking inspiration from the catalytic properties of single-site catalysts and the enhancement of performance through ionic liquids on metal catalysts, we exploited a scalable way to deliberately place single cobalt ions on carbon nanotube surface bridged by polymerized ionic liquid. Single dispersed cobalt ions coordinated by ionic liquid are used as heterogeneous catalysts for the oxygen evolution reaction (OER). Performance data reveals high activity and stable operation without chemical instability.
January 9, 2018: Angewandte Chemie
Přemysl Mladěnka, Lenka Applová, Jiří Patočka, Vera Marisa Costa, Fernando Remiao, Jana Pourová, Aleš Mladěnka, Jana Karlíčková, Luděk Jahodář, Marie Vopršalová, Kurt J Varner, Martin Štěrba
Cardiovascular diseases are a leading cause of morbidity and mortality in most developed countries of the world. Pharmaceuticals, illicit drugs, and toxins can significantly contribute to the overall cardiovascular burden and thus deserve attention. The present article is a systematic overview of drugs that may induce distinct cardiovascular toxicity. The compounds are classified into agents that have significant effects on the heart, blood vessels, or both. The mechanism(s) of toxic action are discussed and treatment modalities are briefly mentioned in relevant cases...
January 5, 2018: Medicinal Research Reviews
Yicheng Wei, Xiang Ren, Hongmin Ma, Xu Sun, Yong Zhang, Xuan Kuang, Tao Yan, Dan Wu, Qin Wei
Energy conversion and storage systems such as water splitting devices and metal-air batteries need excellent and energy-efficiency oxygen evolution reaction (OER) catalysts. Herein, we report the in-situ development of sawtooth-like Co(TCNQ)2 (TCNQ = tetracyanoquinodimethane) metal-organic framework array on Co foil (Co(TCNQ)2/Co) via solution immersion method at room temperature. As an oxygen-evolving catalyst, the resulting Co(TCNQ)2/Co demonstrates superior OER activity with overpotential of 310 mV to drive a geometrical catalytic current density of 15 mA cm-2 in 1...
January 4, 2018: Chemistry: a European Journal
Zhihe Liu, Hua Tan, Jianping Xin, Jiazhi Duan, Xiaowen Su, Pin Hao, Junfeng Xie, Jie Zhan, Jing Zhang, Jian-Jun Wang, Hong Liu
Transition metal nitrides have attracted a great deal of interest as electrocatalysts for water splitting due to their super metallic performance, high efficiency and good stability. Herein, we report a novel design of hierarchical electrocatalyst based on Ni3FeN, where the presence of carbon fiber cloth as scaffold can effectively alleviate the aggregation of Ni3FeN nanostructure and form 3D conducting networks to enlarge the surface area and simultaneously enhance the charge transfer. The composition and morphological variations of NiFe-precursors during annealing in different atmosphere were investigated...
January 9, 2018: ACS Applied Materials & Interfaces
Daniel Bick, Tobias B Krebs, Dominik Kleimaier, Alexander F Zurhelle, Georgi T Staikov, Rainer Waser, Ilia Valov
Oxygen evolution reaction (OER) during alkaline water electrolysis is the bottleneck of water splitting. Perovskite materials have been particularly proposed as good and economically reasonable electrocatalysts for the OER, showing promises and advantages with respect to classic metallic electrodes. However, the degradation of perovskites during catalysis is limiting their service lifetime. Recently, the material BaCo0.98Ti0.02O3-δ:Co3O4 was shown to be electrocatalytically and chemically stable during water electrolysis even at industrially relevant conditions...
January 5, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Ian G McKendry, Akila C Thenuwara, Samantha L Shumlas, Haowei Peng, Yaroslav V Aulin, Parameswara Rao Chinnam, Eric Borguet, Daniel R Strongin, Michael J Zdilla
The effect on the electrocatalytic oxygen evolution reaction (OER) of cobalt incorporation into the metal oxide sheets of the layered manganese oxide birnessite was investigated. Birnessite and cobalt-doped birnessite were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and conductivity measurements. A cobalt:manganese ratio of 1:2 resulted in the most active catalyst for the OER. In particular, the overpotential (η) for the OER was 420 mV, significantly lower than the η = 780 mV associated with birnessite in the absence of Co...
January 4, 2018: Inorganic Chemistry
Carmen Klein, Ivana Dokic, Andrea Mairani, Stewart Mein, Stephan Brons, Peter Häring, Thomas Haberer, Oliver Jäkel, Astrid Zimmermann, Frank Zenke, Andree Blaukat, Jürgen Debus, Amir Abdollahi
BACKGROUND: Hypoxia-induced radioresistance constitutes a major obstacle for a curative treatment of cancer. The aim of this study was to investigate effects of photon and carbon ion irradiation in combination with inhibitors of DNA-Damage Response (DDR) on tumor cell radiosensitivity under hypoxic conditions. METHODS: Human non-small cell lung cancer (NSCLC) models, A549 and H1437, were irradiated with dose series of photon and carbon ions under hypoxia (1% O2) vs...
December 29, 2017: Radiation Oncology
Hamed Simchi, Kayla A Cooley, Jonas Ohms, Lingqin Huang, Philipp Kurz, Suzanne E Mohney
Calcium manganese oxide films were prepared by cosputter deposition from Mn and CaMnO3 targets and evaluated for their suitability as catalysts for the oxygen evolution reaction (OER). Scanning electron microscopy (SEM) revealed a compact morphology for the as-deposited films and the formation of nanorodlike features on the surfaces after annealing at 600 °C. X-ray-photoelectron-spectroscopy analysis showed that the surface oxidation state is close to +III (as in Mn2O3) for the as-deposited films and increases slightly to a mixture of III and IV after annealing occurs in dry air at 400-600 °C...
December 28, 2017: Inorganic Chemistry
Khang Ngoc Dinh, Penglun Zheng, Zhengfei Dai, Yu Zhang, Raksha Dangol, Yun Zheng, Bing Li, Yun Zong, Qingyu Yan
Herein, the hydrothermal synthesis of porous ultrathin ternary NiFeV layer double hydroxides (LDHs) nanosheets grown on Nickel foam (NF) substrate as a highly efficient electrode toward overall water splitting in alkaline media is reported. The lateral size of the nanosheets is about a few hundreds of nanometers with the thickness of ≈10 nm. Among all molar ratios investigated, the Ni0.75 Fe0.125 V0.125 -LDHs/NF electrode depicts the optimized performance. It displays an excellent catalytic activity with a modest overpotential of 231 mV for the oxygen evolution reaction (OER) and 125 mV for the hydrogen evolution reaction (HER) in 1...
December 27, 2017: Small
Jorien L Treur, Andrea D Rozema, Jolanda J P Mathijssen, Hans van Oers, Jacqueline M Vink
Alternative tobacco products are increasing in popularity. An important question is whether their use is associated with or even leads to conventional smoking, but large-scale (European) studies are scarce. In two cohorts of Dutch adolescents (Cohort I n = 6819, mean age = 13.8 SD = 1.1, 48.2% female; Cohort II n = 2758, mean age = 17.3 SD = 1.8, 61.3% female), we investigated use of electronic (e)-cigarettes with nicotine, e-cigarettes without nicotine and waterpipe. Generalized estimating equation modelling was conducted with ever conventional smoking as the dependent variable (0 = no, 1 = yes) and ever alternative tobacco use as the independent variable, correcting for clustering within schools, age, sex and education in both cohorts...
December 19, 2017: European Journal of Epidemiology
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