scholarly journals Potentiometric C2H4-Selective Detection on Solid-State Sensors Activated with Bifunctional Catalytic Nanoparticles

Chemosensors ◽  
2021 ◽  
Vol 9 (10) ◽  
pp. 274
Author(s):  
Fidel Toldra-Reig ◽  
Jose Manuel Serra
Keyword(s):  
Solid State ◽  
Electrochemical Impedance ◽  
Impedance Analysis ◽  
Selective Detection ◽  
Catalyst Nanoparticles ◽  
Cross Sensitivity ◽  
Car Exhaust ◽  
Catalytic Nanoparticles ◽  
Oxidation Properties ◽  
Insight Into

This work presents a solid-state ionic-based device to selectively detect C2H4 in car exhaust gases. The sensor consists of 8YSZ as the electrolyte and two electrodes: Fe0.7Cr1.3O3/8YSZ and LSM/8YSZ. The main aim of this work is to optimize the catalytic behavior of the working electrode to C2H4 and reduce cross-sensitivity toward CO and H2O. Several catalyst nanoparticles were infiltrated to tailor C2H4 adsorption and electrochemical oxidation properties while diminishing adsorption and conversion of other gas components such as CO. The infiltrated metal catalysts were selected, taking into account both adsorption and redox properties. Infiltration of Ti or Al, followed by a second infiltration of Ni, enabled the selective detection of C2H4 with low cross-sensitivity toward CO and H2O in a moist gas environment. Further insight into potentiometric C2H4 sensing is achieved by electrochemical impedance analysis of the electrodes activated with bifunctional catalysts.

scholarly journals Assessment of MgHf4P6O24 Electroceramic Oxide Electrolyte in High-Temperature Electrochemical Sensor for Sensing Mg in Non-Ferrous Alloys

2020 ◽  
Author(s):  
Mohammed Adamu
Keyword(s):  
High Temperature ◽  
Solid State ◽  
Electrochemical Sensors ◽  
Electrochemical Impedance ◽  
Reference Electrode ◽  
Impedance Analysis ◽  
Ferrous Alloys ◽  
Solid State Electrolyte ◽  
State Reference ◽  
Oxide Electrolyte

In this paper, the electrochemical impedance analysis of MgHf4P6O24 electroceramic oxide electrolyte on platinised pellets of 13mm diameter (Ø) and 3.8mm thickness depicts the electrical properties of Mg2+-cation conducting species in the characterised solid-state electrolytes measured using the two-probe analysis at 182-764oC, and from 100mHz to 32MHz, were evaluated. In this analysis, promising ionic conductivity of 4.52 x 10-4 Scm-1 for MgHf4P6O24 electroceramic electrolyte was exhibited at 747oC, thereby maintaining both materials and operational stability at 1000oC ≤ T/oC≤1300.In addition to this, the design, fabrication and testing of solid-state Mg-sensors using the electrochemical method have been achieved. The novel high-temperature Mg-sensors were designed using the highly conducting Mg2+-cation solid-state electrolyte by incorporating a biphasic powder mixture of MgCr2O4 + Cr2O3 as ceramic solid-state reference electrode in air, which has shown promising trend after successfully sensing the Mg dissolved in molten Al at 700±5oC. A linear dependence of emf on logarithm of Mg concentration was achieved. The transport number, tmg2+ = 0.84±0.03 was achieved which indicates that the conducting specie in MgHf4P6O24 solid-state electrolyte is Mg2+-cation. The solid-state electrolyte has the potential for application in high-temperature electrochemical sensors and other devices.

Characterizations of Synthetic 8mol% YSZ with Comparison to 3mol %YSZ for HT-SOFC

2020 ◽  
Vol 38 (4A) ◽  
pp. 491-500
Author(s):  
Abeer F. Al-Attar ◽  
Saad B. H. Farid ◽  
Fadhil A. Hashim
Keyword(s):  
Ionic Conductivity ◽  
Electrochemical Impedance ◽  
Structural Information ◽  
Impedance Analysis ◽  
High Energy ◽  
Yttria Stabilized Zirconia ◽  
X Ray Diffraction ◽  
Stabilized Zirconia ◽  
Powder Morphology ◽  
X Ray

In this work, Yttria (Y2O3) was successfully doped into tetragonal 3mol% yttria stabilized Zirconia (3YSZ) by high energy-mechanical milling to synthesize 8mol% yttria stabilized Zirconia (8YSZ) used as an electrolyte for high temperature solid oxide fuel cells (HT-SOFC). This work aims to evaluate the densification and ionic conductivity of the sintered electrolytes at 1650°C. The bulk density was measured according to ASTM C373-17. The powder morphology and the microstructure of the sintered electrolytes were analyzed via Field Emission Scanning Electron Microscopy (FESEM). The chemical analysis was obtained with Energy-dispersive X-ray spectroscopy (EDS). Also, X-ray diffraction (XRD) was used to obtain structural information of the starting materials and the sintered electrolytes. The ionic conductivity was obtained through electrochemical impedance spectroscopy (EIS) in the air as a function of temperatures at a frequency range of 100(mHz)-100(kHz). It is found that the 3YSZ has a higher density than the 8YSZ. The impedance analysis showed that the ionic conductivity of the prepared 8YSZ at 800°C is0.906 (S.cm) and it was 0.214(S.cm) of the 3YSZ. Besides, 8YSZ has a lower activation energy 0.774(eV) than that of the 3YSZ 0.901(eV). Thus, the prepared 8YSZ can be nominated as an electrolyte for the HT-SOFC.

Insight into the formation of H-bonds propagating the monomeric zinc complexes of a tridentate reduced Schiff base to form an infinite chain

CrystEngComm ◽  
2021 ◽  
Author(s):  
Mainak Karmakar ◽  
Antonio Frontera ◽  
Shouvik Chattopadhyay
Keyword(s):  
Schiff Base ◽  
Solid State ◽  
Dft Calculations ◽  
Zinc Complexes ◽  
Infinite Chain ◽  
State Structure ◽  
Computational Tools ◽  
Solid State Structure ◽  
Reduced Schiff Base ◽  
Insight Into

The formation of an infinite 1D assembly is governed by the H-bonding interactions in the solid state structure of the two zinc complexes. It has been analyzed energetically using DFT calculations and several computational tools.

scholarly journals A Brief Insight into Microbial Corrosion and its Mitigation with Eco-friendly Inhibitors

2021 ◽  
Vol 7 (3) ◽  
Author(s):  
M. Lavanya
Keyword(s):  
Electrochemical Impedance ◽  
Wide Spectrum ◽  
Present Review ◽  
Electrochemical Reactions ◽  
Microbial Corrosion ◽  
Engineering Applications ◽  
Microbially Influenced Corrosion ◽  
Catastrophic Failures ◽  
Chemical Strategies ◽  
Insight Into

AbstractCorrosion results from the electrochemical reactions between the metal and its existing environment. Corrosion results in severe and expensive damage to a wide spectrum of industries. When microbes are involved in corrosion it is seldom possible to economically evaluate its impact. Microbially influenced corrosion is recognized to cause catastrophic failures contributing to approximately 20% of the annual losses. In many engineering applications, microbially influenced corrosion control is of prime importance. Expensive, toxicity and sometimes, even ineffectiveness of the current chemical strategies to mitigate microbially influenced corrosion have shifted the interest towards eco-friendly inhibitors. The present review discusses microbial induced corrosion in various metals and its inhibition through eco-friendly inhibitors. In addition, the study also reviews the morphological and electrochemical impedance results.

Electrochemical Impedance Analysis of the Wear of Planographic Plates

CORROSION ◽  
1991 ◽  
Vol 47 (1) ◽  
pp. 67-73 ◽  
Author(s):  
M. W. Kendig ◽  
S. Breitweiser ◽  
E. Hudyma
Keyword(s):  
Electrochemical Impedance ◽  
Impedance Analysis

Incentives for Using LEIM in the Investigation of Corrosion Initiation on Organic Coated Alloys

2001 ◽  
Vol 699 ◽  
Author(s):  
S. R. Taylor ◽  
A.M. Mierisch
Keyword(s):  
Electrochemical Impedance ◽  
Numerical Models ◽  
Physical Phenomenon ◽  
Product Formation ◽  
Coated Metal ◽  
Aqueous Environments ◽  
Damage Process ◽  
Experimental Process ◽  
Measurement Artifact ◽  
Insight Into

AbstractLocal electrochemical impedance mapping and spectroscopy (LEIM/S) have become important tools for the investigation of local electrochemical breakdown events associated with the degradation of organically coated metals in aqueous environments. LEIM/S of organic coated metal substrates has revealed local degradation events that are distributed spatially and temporally. These observations provide support to a number of long-standing theories, as well as provide new insight into the damage process. The local changes in impedance observed at early stages of immersion support the presence of virtual pores, while the metastability of impedance peaks representing the local changes provide evidence of healing via corrosion product formation. Each of these are long-standing theories used to explain global electrochemical impedance measurements. This paper will provide an overview of some of the events observed using LEIM and examine these results in the context of recent analytical and numerical models. Models used to predict the electric field above an equipotential disk electrode support the interpretation of most experimental LEI data as being representative of chemical and physical phenomenon and not a result of measurement artifact. However, certain features may be an artifact of the finite nature of the experimental process. The interpretation of LEIM events in view of current experimental and modeling results will be discussed.

Insight into the performance of GGA functionals for solid-state calculations

2009 ◽  
Vol 80 (19) ◽  
Author(s):  
Philipp Haas ◽  
Fabien Tran ◽  
Peter Blaha ◽  
Karlheinz Schwarz ◽  
Robert Laskowski
Keyword(s):  
Solid State ◽  
Insight Into

The Detection And Mapping Of Defects In Organic Coatings Using Local Electrochemical Impedance Methods

1995 ◽  
Vol 411 ◽  
Author(s):  
S. R. Taylor ◽  
M. W. Wittmann
Keyword(s):  
Electrochemical Impedance ◽  
Organic Coatings ◽  
Single Frequency ◽  
Probe Design ◽  
Coating Failure ◽  
Local Electrochemical Impedance Spectroscopy ◽  
Physical Defects ◽  
Steel Substrates ◽  
Insight Into

ABSTRACTCoating failure initiates as a local event at defects which can result from chemical heterogeneities in the resin or physical defects such as bubbles, underfilm deposits, or pinholes. The ability to detect, map the location, as well as make quantitative in-situ measurements of coating heterogeneities will help identify the source of failure (i.e. coating chemistry, method of application, cure schedule, etc.) and provide insight into the mechanisms of coating degradation. This study used a 5 electrode arrangement to perform local electrochemical impedance spectroscopy (LEIS) on coated steel substrates. Using single frequency measurements, LEIS could successfully detect and map both intentional chemical heterogeneities and physical defects such as subsurface bubbles, underfilm deposits, and pinholes. Efforts to optimize probe design and instrumentation are ongoing.

Sign in / Sign up

Export Citation Format

Share Document