Simple and Precise Approach for Determination of Ohmic Contribution of Diaphragms in Alkaline Water Electrolysis

A simple and low-cost alternating current (AC)-based method, without electrolyte correction, is proposed (Electrochemical Impedance Spectroscopy (EIS)-Zero Gap Cell) for the determination of ohmic contribution of diaphragms. The effectiveness of the proposed methodology was evaluated by using a commercial Alkaline Water Electrolysis (AWE) diaphragm (Zirfon®). Furthermore, the results were compared with two conventional electrochemical methodologies for calculating the separator resistance, based on direct current (DC), and AC measurements, respectively. Compared with the previous techniques, the proposed approach reported more accurate and precise values of resistance for new and aged samples. Compared with the manufacturer reference, the obtained error values for new samples were 0.33%, 5.64%, and 41.7%, respectively for EIS-Zero gap cell, AC and DC methods, confirming the validity and convenience of the proposed technique.

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Atomic Heterointerface Engineering Breaks Activity Limitation of Electrocatalysts and Promises Highly-Efficient Alkaline Water Splitting

Energy & Environmental Science ◽

10.1039/d1ee02105b ◽

2021 ◽

Author(s):

Qiucheng Xu ◽

Jiahao Zhang ◽

Haoxuan Zhang ◽

Liyue Zhang ◽

Ling Chen ◽

...

Keyword(s):

Water Splitting ◽

Anion Exchange ◽

Low Cost ◽

Water Electrolysis ◽

Anion Exchange Membrane ◽

Alkaline Water Electrolysis ◽

Green Electricity ◽

Alkaline Water ◽

Highly Efficient ◽

Exchange Membrane

Alkaline water splitting, especially the anion-exchange-membrane based water electrolysis, is an attractive way for low-cost and scalable H2 production. Green electricity-driven alkaline water electrolysis is requested to develop highly-efficient electrocatalysts...

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The influence of chromium as a diffusive additive in the boronizing treatment of AISI 4140 steel on the corrosion resistance of the coating evaluated by Electrochemical Impedance Spectroscopy (EIS)

MATEC Web of Conferences ◽

10.1051/matecconf/202031801040 ◽

2020 ◽

Vol 318 ◽

pp. 01040

Author(s):

Dimitrios I. Zagkliveris ◽

Azarias Mavropoulos ◽

Efstathios Ntovinos ◽

Georgios K. Triantafyllidis

Keyword(s):

Electrochemical Impedance Spectroscopy ◽

Impedance Spectroscopy ◽

Electrochemical Impedance ◽

Low Cost ◽

Industrial Applications ◽

Pack Cementation ◽

Boride Phase ◽

Corrosion Resistant ◽

Aisi 4140 Steel ◽

Aisi 4140

A large variety of protective coating is being used in industrial applications to improve the resistance of the metallic substrates against corrosion. The pack-cementation method for boronizing and borochromizing is effective to produce extremely hard and corrosion resistant thick coatings and, additionally, is a low-cost and simple technique. In the present study, AISI 4140 steel specimens underwent boronizing and afterwards chromizing by the pack-cementation method using B4C as boron source and Fe-Cr as chromium source, respectively. In both treatments the appropriate activators were used. After chromizing the boronized substrate, a mixed boride phase FeCrB was formed, as it was confirmed by X-ray Diffractometry (XRD). The boronized and the borochromized specimens were subjected to Electrochemical Impedance Spectroscopy (EIS). From the analysis of the frequency response of the coating systems (Bode and Nyquist display), the conclusion that the borochromized specimens were significantly more corrosion resistant was extracted. Finally, data of optical and electron microscopy contribute to the validity of the conclusions.

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Design of Automatic Measurement System of Lithium Battery Electrochemical Impedance Spectroscopy Based on Microcomputer

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.241-244.259 ◽

2012 ◽

Vol 241-244 ◽

pp. 259-264 ◽

Cited By ~ 1

Author(s):

Wang Li ◽

Gen Wang Liu ◽

Fu He Yang

Keyword(s):

Electrochemical Impedance Spectroscopy ◽

Impedance Spectroscopy ◽

High Precision ◽

Measurement System ◽

Lithium Battery ◽

Electrochemical Impedance ◽

Low Cost ◽

Automatic Measurement ◽

Response Curves ◽

High Level

A system of miniaturized lithium battery electrochemical impedance spectroscopy (EIS) measurement is designed with high precision impedance converter chip AD5933 as its core. The measurement range of the system is from 0.010Hz to 100 KHz. Meanwhile, by using a high-level programming language of C#, an interface is developed which can real-time graphic display of EIS information. Through measurement and analysis of two types of impedance, the results show that detection precision of the system is less than 3.5%. Finally, amplitude-frequency response curves and Nyquist plots of HL-18650 M lithium battery at different state of charge (SOC) levels are measured. Compared with lithium battery EIS measurement system by traditional division, this system has the outstanding advantages of small size, high level of integration, low cost, simple operation and high precision. It is helpful to the mass production and application of lithium battery EIS measurement system.

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Localised electrochemical impedance spectroscopy with high lateral resolution by means of alternating current scanning electrochemical microscopy

Electrochemistry Communications ◽

10.1016/s1388-2481(01)00294-6 ◽

2002 ◽

Vol 4 (2) ◽

pp. 134-138 ◽

Cited By ~ 84

Author(s):

B Ballesteros Katemann

Keyword(s):

Electrochemical Impedance Spectroscopy ◽

Impedance Spectroscopy ◽

Electrochemical Impedance ◽

Scanning Electrochemical Microscopy ◽

Alternating Current ◽

Lateral Resolution ◽

High Lateral Resolution ◽

Electrochemical Microscopy

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A Low-Cost Aptamer Immobilization Technique for the Selective Detection of Protein Biomarkers Using Electrochemical Impedance Spectroscopy

ECS Meeting Abstracts ◽

10.1149/ma2017-01/42/1945 ◽

2017 ◽

Keyword(s):

Electrochemical Impedance Spectroscopy ◽

Impedance Spectroscopy ◽

Electrochemical Impedance ◽

Low Cost ◽

Selective Detection ◽

Protein Biomarkers

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Electrochemical Impedance Spectroscopy for the Measurement of the Corrosion Rate of Magnesium Alloys: Brief Review and Challenges

Metals ◽

10.3390/met10060775 ◽

2020 ◽

Vol 10 (6) ◽

pp. 775 ◽

Cited By ~ 2

Author(s):

Sebastián Feliu

Keyword(s):

Electrochemical Impedance Spectroscopy ◽

Impedance Spectroscopy ◽

Corrosion Rate ◽

Electrochemical Impedance ◽

State Of The Art ◽

Point Of View ◽

Reliable Determination ◽

Corrosion Rates ◽

Non Destructive

From a technological point of view, measurement of the corrosion rate of magnesium (Mg) and its alloys is critical for lifetime predictions of Mg-based structures and for comparative assessments of their corrosion protection ability. Whilst weight loss, hydrogen evolution, and polarization curves methods are frequently used for measuring the corrosion rate, the determination of values by electrochemical impedance spectroscopy (EIS) is relatively scarce and has only been realized recently. This technique seems to be the most suitable for monitoring corrosion rate values due to its “non-destructive” character, its reproducibility, and its reliable determination of small corrosion rates, much lower than those measured by other techniques. This review aims to picture the state-of-the-art technique of using EIS for measuring the corrosion rate of Mg. This paper starts by introducing some fundamental aspects of the most widely used methods for monitoring the corrosion rate of Mg/Mg alloy and continues by briefly explaining some of the fundamental concepts surrounding EIS, which are essential for the user to be able to understand how to interpret the EIS spectra. Lastly, these concepts are applied, and different approaches that have been proposed to obtain quantitative values of corrosion rate since the 1990s are discussed.

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Non-Precious Electrodes for Practical Alkaline Water Electrolysis

Materials ◽

10.3390/ma12081336 ◽

2019 ◽

Vol 12 (8) ◽

pp. 1336 ◽

Cited By ~ 18

Author(s):

Alejandro N. Colli ◽

Hubert H. Girault ◽

Alberto Battistel

Keyword(s):

Large Scale ◽

Low Cost ◽

Renewable Energy Sources ◽

Water Electrolysis ◽

Industrial Applications ◽

Alkaline Water Electrolysis ◽

Stainless Steel 316L ◽

Experimental Conditions ◽

Alkaline Water ◽

Cell Components

Water electrolysis is a promising approach to hydrogen production from renewable energy sources. Alkaline water electrolyzers allow using non-noble and low-cost materials. An analysis of common assumptions and experimental conditions (low concentrations, low temperature, low current densities, and short-term experiments) found in the literature is reported. The steps to estimate the reaction overpotentials for hydrogen and oxygen reactions are reported and discussed. The results of some of the most investigated electrocatalysts, namely from the iron group elements (iron, nickel, and cobalt) and chromium are reported. Past findings and recent progress in the development of efficient anode and cathode materials appropriate for large-scale water electrolysis are presented. The experimental work is done involving the direct-current electrolysis of highly concentrated potassium hydroxide solutions at temperatures between 30 and 100 °C, which are closer to industrial applications than what is usually found in literature. Stable cell components and a good performance was achieved using Raney nickel as a cathode and stainless steel 316L as an anode by means of a monopolar cell at 75 °C, which ran for one month at 300 mA cm−2. Finally, the proposed catalysts showed a total kinetic overpotential of about 550 mV at 75 °C and 1 A cm−2.

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