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ion-selective electrode

Bingya Hou, Lang Shen, Haotian Shi, Jihan Chen, Bofan Zhao, Kun Li, Yi Wang, Guozhen Shen, Mai-Anh Ha, Fanxin Liu, Anastassia N Alexandrova, Wei-Hsuan Hung, Jahan M Dawlaty, Phillip Christopher, Stephen B Cronin
It has been known for several decades that defects are largely responsible for the catalytically active sites on metal and semiconductor surfaces. However, it is difficult to directly probe these active sites because the defects associated with them are often relatively rare with respect to the stoichiometric crystalline surface. In the work presented here, we demonstrate a method to selectively probe defect-mediated photocatalysis, through differential AC photocurrent (PC) measurements. In this approach, electrons are photoexcited from the valence band to a relatively narrow distribution of sub-bandgap states in the TiO2, and then subsequently to the ions in solution...
February 15, 2019: ACS Applied Materials & Interfaces
Feng Wu, Haoyi Yang, Ying Bai, Chuan Wu
Aluminum metal is a high-energy-density carrier with low cost, and thus endows rechargeable aluminum batteries (RABs) with the potential to act as an inexpensive and efficient electrochemical device, so as to supplement the increasing demand for energy storage and conversion. Despite the enticing aspects regarding cost and energy density, the poor reversibility of electrodes has limited the pursuit of RABs for a long time. Fortunately, ionic-liquid electrolytes enable reversible aluminum plating/stripping at room temperature, and they lay the very foundation of RABs...
February 15, 2019: Advanced Materials
Seung-Pyo Kim, Han-Cheol Choe
In this study, functional elements coatings on the plasma electrolytic oxidation (PEO)-treated Ti-6Al-4V alloy by electrochemical precipitation method were investigated. Ti-6Al-4V ELI disks were used as specimens for PEO and HA coating. The applied voltage and time were selected to be 280 V and 3 minutes for PEO treatment, respectively. The electrochemical precipitation on the Ti-6Al-4V alloy was carried out using cyclic voltammetry with cycle of 3, 5, 10, and 20 from -1.5 V to 0 V (vs. SCE electrode) in electrolyte containing Ca, P, Mg, Mn, Sr, Zn, and Si ions by cyclic voltammetry after PEO treatment...
July 1, 2019: Journal of Nanoscience and Nanotechnology
Tengteng Wu, Peipei Li, Huanbo Wang, Runbo Zhao, Qiang Zhou, Wenhan Kong, Meiling Liu, Youyu Zhang, Xuping Sun, Feng Frank Gong
Electrocatalytic N2 reduction as an alternative approach to the energy-intensive and large CO2-producing Haber-Bosch process for NH3 synthesis under mild conditions has attracted extensive attention. Current research efforts on N2 reduction have mainly focused on metal-based catalysts, but metal-free alternatives can avoid the issue of metal ion release. In this work, oxygen-doped hollow carbon microtubes (O-KFCNTs) derived from natural kapok fibers are reported as a metal-free NRR electrocatalyst for N2-to-NH3 conversion with excellent selectivity...
February 12, 2019: Chemical Communications: Chem Comm
Bernardo Patella, Carmelo Sunseri, Rosalinda Inguanta
In this work, we present some results concerning the electrochemical behavior of nanostructured-based electrochemical sensors. In particular, the attention has been focused on Pd and Cu nanowires for detection of hydrogen peroxide and NiO thin film or Ni@NiO core-shell nanowires for detection of mercury ions. Ordered array of Pd and Cu nanowires was obtained through displacement deposition reaction in a commercial polycarbonate membrane acting as a template. The method leads to stable nanostructured electrodes of Pd and Cu with high surface area...
June 1, 2019: Journal of Nanoscience and Nanotechnology
Sangwook Joo, Ohhun Kwon, Kyeounghak Kim, Seona Kim, Hyunmin Kim, Jeeyoung Shin, Hu Young Jeong, Sivaprakash Sengodan, Jeong Woo Han, Guntae Kim
Exsolution has been intensively studied in the fields of energy conversion and storage as a method for the preparation of catalytically active and durable metal nanoparticles. Under typical conditions, however, only a limited number of nanoparticles can be exsolved from the host oxides. Herein, we report the preparation of catalytic nanoparticles by selective exsolution through topotactic ion exchange, where deposited Fe guest cations can be exchanged with Co host cations in PrBaMn1.7 Co0.3 O5+δ . Interestingly, this phenomenon spontaneously yields the host PrBaMn1...
February 11, 2019: Nature Communications
Buddhinie S Jayathilake, Supriyo Bhattacharya, Nagarajan Vaidehi, S R Narayanan
Increasing levels of carbon dioxide in the atmosphere and the growing need for energy necessitate a shift toward reliance on renewable energy sources and the utilization of carbon dioxide. Thus, producing carbonaceous fuel by the electrochemical reduction of carbon dioxide has been very appealing. We have focused on addressing the principal challenges of poor selectivity and poor energy efficiency in the electrochemical reduction of carbon dioxide. We have demonstrated here a viable pathway for the efficient and continuous electrochemical reduction of CO2 to formate using the metal-independent enzyme type of formate dehydrogenase (FDH) derived from C andida boidinii yeast...
February 11, 2019: Accounts of Chemical Research
Wenqing Ma, Yahui Wang, Yijun Yang, Xi Wang, Zhihao Yuan, Xizheng Liu, Yi Ding
Lithium ion batteries (LIBs) process performance fading and safety concerns at low temperature (LT) prohibit their application in cold climates. The alloy-type electrodes demonstrate great potentials in stable and dendrite-free anodes at LT. Herein, we report a temperature-dependent Li-storage performance in Al-based nanoporous alloy anode. The nanoporous-structured Cu-Ge-Al ternary alloys (NP-CuGeAl) have been designed and prepared by selectively etching Al out. The high Al-content NP-CuGeAl (acid etching for 6 h, named as CGA-6) is composed of multi-intermetallic compounds (denoted as MxNy, M, N = Cu, Al, Ge) with bimodal porous architectures...
February 11, 2019: ACS Applied Materials & Interfaces
Chuan-Yi Fu, Shui-Jie Chen, Nan-Hua Cai, Zhao-Hui Liu, Mao Zhang, Peng-Cheng Wang, Jian-Nong Zhao
OBJECTIVES: We attempted to determine whether a functional polymorphism of TRPM6 (rs2274924) is associated with susceptibility to epilepsy following ischemic stroke, and to further explore the effect of this polymorphism on serum levels of Mg2+ in post-stroke patients. METHODS: We carried out a case-control study on 378 post-stroke epilepsy patients and 420 controls (stroke patients without secondary epilepsy). We used DNA sequencing to determine the genotypes of the TRPM6 rs2274924 polymorphism, and used the ion selective electrode method to measure serum levels of Mg2+ ...
February 9, 2019: Neurological Research
Zong-Min Ma, Xing-Sheng Wu, Dou-Dou Zheng, Jiu-Yan Wei, Yan-Na Xie, Yun-Bo Shi, Kun Huang, Xiao-Ming Zhang, Jun Liu
Nowadays, determination of the iron ions with high sensitivity and selectivity with novel methods becomes a matter of urgency for monitoring healthy body and environment. In this paper, for the first time, we present a set of high-performance TiO2 nanotube arrays which are quite sensitive to iron ions. Firstly, the anodic oxidation method was adopted to prepare ordered TiO2 nanotube arrays, followed by functionalized Ag nanoparticle deposition with the enhancement ability in iron ion sensing. Besides, the spectrum of the TiO2 nanotube with/without the Ag nanoparticles was analyzed with an X-ray photoelectron spectrometer, which shows that Ag nanoparticles can effectively reduce the recombination rate of electrons and holes, and increase the conductivity and the charge transfer rate of the electrodes...
February 6, 2019: Nanoscale Research Letters
Zenonas Jusys, Johannes Schnaidt, R Jürgen Behm
Aiming at a detailed understanding of the interaction between an ionic liquid, O2 , and electrodes in Mg-air batteries, we performed a combined differential electrochemical mass spectrometry and in situ infrared spectroscopy model study on the interaction between the ionic liquid (IL) 1-butyl-1-methylpyrrolidinium bis(trifluoromethanesulfonyl) imide (BMP-TFSI) and a gold film electrode in the presence and absence of O2 and Mg2+ ions in the potential range relevant for the oxygen reduction reaction (ORR) and evolution reaction...
January 28, 2019: Journal of Chemical Physics
Hiroyuki Kaneko, Tsutomu Minegishi, Hiroyuki Kobayashi, Yongbo Kuang, Kazunari Domen
A photoelectrochemical (PEC) cell composed of two semiconductor electrodes, a photocathode, and a photoanode is a potentially effective means of obtaining hydrogen through spontaneous overall water splitting under light irradiation. However, the long-term stability (that is, operation for more than one day) of a PEC cell has not yet been demonstrated. In addition to the corrosion of both photoelectrodes, the gradual migration of heavy metal cations from the photoanode into the electrolyte can also result in degradation of the cell by contamination of the photocathode surface...
January 28, 2019: Journal of Chemical Physics
Miho Asahi, Masaki Kobayashi, Takahiro Kagami, Kunimitsu Nakahira, Yuki Furukawa, Yoshihisa Ozoe
Fluxametamide is a novel wide-spectrum insecticide that was discovered and synthesized by Nissan Chemical Industries, Ltd. To identify the mode of action of fluxametamide, we first performed [3 H]4'-ethynyl-4-n-propylbicycloorthobenzoate (EBOB) binding assays. Fluxametamide potently inhibited the specific binding of [3 H]EBOB to housefly-head membranes, suggesting that fluxametamide affects insect γ-aminobutyric acid (GABA)-gated chloride channels (GABACls). Next, the antagonism of housefly GABACls and glutamate-gated chloride channels (GluCls) was examined using the two-electrode voltage clamp (TEVC) method...
October 2018: Pesticide Biochemistry and Physiology
Dejun Ma, Qiulan Zhu, Xintao Li, Hongcheng Gao, Xiufang Wang, Xiongwu Kang, Yong Tian
The recognition of solid electrolyte interface (SEI) between the electrode materials and electrolyte is limiting the selection of electrode materials, electrolytes and further the electrochemical performance of batteries. Herein, we report ZnSe@C core-shell nanocomposites derived from ZIF-8 as anode materials of lithium ion batteries (LIBs), the electrochemical performances and SEI films formed on ZnSe@C in both ether and carbonate electrolytes. It is found that ZnSe@C delivers a reversible capacity of 617...
January 31, 2019: ACS Applied Materials & Interfaces
Yasmi O Crystal, Sasan Rabieh, Malvin N Janal, Sarunphorn Rasamimari, Timothy G Bromage
BACKGROUND: As silver diamine fluoride (SDF) gains popularity for caries arrest, the authors aimed to investigate the content of fluoride and silver in 38% SDF produced for the US market and its short-term stability. METHODS: Five samples of 38% SDF were evaluated when the bottle was first opened, and at 7 and 28 days. Fluoride concentrations were determined with a fluoride ion-selective electrode, and silver concentrations were determined with a simultaneous inductively coupled plasma mass spectrometer...
February 2019: Journal of the American Dental Association
Rongrong Wu, Xue-Gang Chen, Chunhui Tao, Yuanfeng Huang, Ying Ye, Qiujin Wang, Yifan Zhou, Quan Jin, Wei Cai
Ion-Selective Electrode (ISE) is an emerging technology for in situ monitoring of the chemical concentrations of an aqueous environment. In this work, we reported a novel all-solid-state silicate ISE, using an Ag/Pb/PbSiO₃ electrode. This electrode responded to aqueous SiO₃2- with a reasonable slope of -31.34 mV/decade and a good reproductivity. The linear range covered from 10-5 M to 10-1 M, for the Na₂SiO₃ solutions and the response time was generally less than 5 s. Its potentiometric response to pH and silicate indicated that the prepared electrode was sensitive to silicate, rather than pH...
January 27, 2019: Sensors
Xingduo Ji, Chao Yu, Yilin Wen, Jun Chen, Yujie Yu, Chengli Zhang, Rufei Gao, Xinyi Mu, Junlin He
Low molecular weight pollutants from foods have aroused global attention due to their toxicity after long-time exposure. There is an increased demand for appropriate methods to detect these pollutants in foods. In this study, a brand-new type of nano metal-organic coordination polymers (MOCPs) nanocarriers (3D sakura-shaped copper (II) ions@L-glutamic acid (L-Glu)) has been first synthesized. We herein demonstrate a facile chelated method that allows the combination of copper (II) ions and L-Glu. A series of controlled experiments have revealed that the reaction time and the ratio of reactants played the crucial roles in affecting the morphology of the final product...
January 15, 2019: Biosensors & Bioelectronics
Dawei Fan, Xin Liu, Chunzhu Bao, Jinhui Feng, Huan Wang, Hongmin Ma, Dan Wu, Qin Wei
A novel and sensitive sandwich-type photoelectrochemical (PEC) immunosensor was developed for the quantitative detection of β-amyloid protein (Aβ). A ITO electrode was sequentially coated with hierarchical porous zinc oxide (ZnO) microspheres with a large specific area, sensitized with tris(bipyridine)ruthenium(II) ion (Ru(bpy)3 2+ ) to achieve high visible light absorption, and modified with cerium-doped cadmium sulfide (Ce-CdS) nanoparticles to enhance the PEC response. Under the stimulation of visible light and ascorbic acid as an efficient electron donor, the photoelectric signal of ZnO/Ru(bpy)3 2+ /Ce-CdS was 70 times that of pure ZnO...
January 21, 2019: Biosensors & Bioelectronics
Michael C Brothers, Madeleine DeBrosse, Claude C Grigsby, Rajesh R Naik, Saber M Hussain, Jason Heikenfeld, Steve S Kim
Physiological sensors in a wearable form have rapidly emerged on the market due to technological breakthroughs and have become nearly ubiquitous with the Apple Watch, FitBit, and other wearable devices. While these wearables mostly monitor simple biometric signatures, new devices that can report on the human readiness level through sensing molecular biomarkers are critical to optimizing the human factor in both commercial sectors and the Department of Defense. The military is particularly interested in real-time, wearable, minimally invasive monitoring of fatigue and human performance to improve the readiness and performance of the war fighter...
January 28, 2019: Accounts of Chemical Research
Diana K Fahem, Ola M El Houssini, Mohamed K Abd El-Rahman, Hala E Zaazaa
Rocuronium bromide (ROC) is currently regarded as the 'gold-standard' in emergency medicine and anesthesia. Globally, millions of human beings are daily administered ROC at emergency settings where it is favored among all the neuromuscular blockers, particularly succinylcholine, for both its fast onset of action and short duration. However, it has been reported that 45% of patients in the post-anesthesia care unit are susceptible to residual postoperative paralysis, undesired ventilator effects and incomplete recovery after ROC administration...
May 1, 2019: Talanta
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