Room temperature ionic-liquid electrochemical gas sensor array system for real-time mine safety monitoring

Li, Haitao; Mu, Xiaoyi; Wang, Zhe; Guo, Min; Zeng, Xiangqun; Mason, Andrew J.

doi:10.1109/icsens.2013.6688143

Cited by 9 publications

(6 citation statements)

References 12 publications

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“…The use of ionic liquids (ILs) as replacement of conventional aqueous electrolytes or as a mixture with those has been receiving increasing attention − , due to their effects on the intermolecular interactions and consequently on the electrode–electrolyte interface. , IL is a common designation for semiorganic salts composed of organic cations and organic or inorganic anions, often liquid around room temperature, generally characterized by a wide range of fluidity, high ionic conductivity, excellent thermal and chemical stability, high heat capacity, and high cohesive energy density. − Additionally, one interesting feature is that their properties may be tailored by combining appropriate cations and anions from a wide variety of species. , Making use of these characteristics, ILs can form stable, ion-conductive suspensions used in many electrochemical applications, such as solar cells, , electrochemical sensors, − fuel cells, , double-layer capacitors, − lithium batteries, − CO 2 electroreduction, − synthesis and functionalization of electrocatalysts, ,, or as electrolytes for water electrolysis. − , …”

Section: Introductionmentioning

confidence: 99%

Toward Tailoring of Electrolyte Additives for Efficient Alkaline Water Electrolysis: Salicylate-Based Ionic Liquids

Amaral

Minkiewicz

Šljukić

et al. 2018

ACS Appl. Energy Mater.

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The effect on the hydrogen evolution reaction (HER) of adding small amounts of three homemade salicylate ([Sal])-based ionic liquids (ILs), specifically 1-butyl-3-methylimidazolium salicylate () and imidazolium salicylate ([Im][Sal]), to KOH electrolyte solutions is investigated. Density, viscosity and electrical conductivity of these nontoxic ILs are determined, further enabling determination of their ionicity. Electrochemical characterization is performed using platinum electrodes in 8 M KOH solution and after addition of 1 vol % of each ionic liquid. The measurements in the IL-added electrolytes showed higher currents and a small effect on the activation energy. Tafel analysis and electrochemical impedance spectroscopy measurements show the Volmer reaction as the rate-determining step of the HER, as well as a strong decrease of the overall impedance in the ILs-added electrolytes, which allow stable operation. The charge transfer and the polarization resistances are substantially reduced in the IL-added solutions, particularly after [Bmim][Sal] addition, with the effect of the additives becoming less important as the temperature increases. A Langmuir-type monolayer adsorption of H ads to the electrode surface is observed. This work shows that adding small amounts of selected ILs to the KOH electrolyte may enhance the HER in alkaline media, supporting the goal of designing efficient ionic liquid additives for water electrolysis.

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Section: Introductionmentioning

confidence: 99%

Toward Tailoring of Electrolyte Additives for Efficient Alkaline Water Electrolysis: Salicylate-Based Ionic Liquids

Amaral

Minkiewicz

Šljukić

et al. 2018

ACS Appl. Energy Mater.

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“…Two approaches that have been introduced to address this limitation are decreasing RTIL thickness and avoiding gas permeation through RTIL [19]. In our previous work, the second approach was adopted in a sensor structure with a porous polytetrafluoroethylene (PTFE) substrate through which gas could quickly diffuse [18, 20]. This sensor utilized constant potential amperometry, which is a classic electroanalytical method for gas detection [12, 21] that continuously applies a constant potential while recording the oxidation or reduction current for qualitative and quantitative gas analysis.…”

Section: Introductionmentioning

confidence: 99%

Rapid measurement of room temperature ionic liquid electrochemical gas sensor using transient double potential amperometry

Wan

Yin

Mason

2017

Sensors and Actuators B: Chemical

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Intense study on gas sensors has been conducted to implement fast gas sensing with high sensitivity, reliability and long lifetime. This paper presents a rapid amperometric method for gas sensing based on a room temperature ionic liquid electrochemical gas sensor. To implement a miniaturized sensor with a fast response time, a three electrode system with gold interdigitated electrodes was fabricated by photolithography on a porous polytetrafluoroethylene substrate that greatly enhances gas diffusion. Furthermore, based on the reversible reaction of oxygen, a new transient double potential amperometry (DPA) was explored for electrochemical analysis to decrease the measurement time and reverse reaction by-products that could cause current drift. Parameters in transient DPA including oxidation potential, oxidation period, reduction period and sample point were investigated to study their influence on the performance of the sensor. Oxygen measurement could be accomplished in 4 s, and the sensor presented a sensitivity of 0.2863 μA/[%O2] and a linearity of 0.9943 when tested in air samples with different oxygen concentrations. Repeatability and long-term stability were also investigated, and the sensor was shown to exhibit good reliability. In comparison to conventional constant potential amperometry, transient DPA was shown to reduce relative standard deviation by 63.2%. With transient DPA, the sensitivity, linearity, repeatability, measurement time and current drift characteristics demonstrated by the presented gas sensor are promising for acute exposure applications.

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“…The detection of oxygen gas at higher (percent) concentrations is of wide significance in a range of industries, including mining [ 1 ], medical [ 2 ], food quality [ 3 ], environmental monitoring [ 4 ], and space exploration [ 5 ]. From a personal safety perspective, concentrations of oxygen below 18% vol.…”

Section: Introductionmentioning

confidence: 99%

Screen-Printed Graphite Electrodes as Low-Cost Devices for Oxygen Gas Detection in Room-Temperature Ionic Liquids

Lee

Hussain

Banks

et al. 2017

Sensors

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Screen-printed graphite electrodes (SPGEs) have been used for the first time as platforms to detect oxygen gas in room-temperature ionic liquids (RTILs). Up until now, carbon-based SPEs have shown inferior behaviour compared to platinum and gold SPEs for gas sensing with RTIL solvents. The electrochemical reduction of oxygen (O2) in a range of RTILs has therefore been explored on home-made SPGEs, and is compared to the behaviour on commercially-available carbon SPEs (C-SPEs). Six common RTILs are initially employed for O2 detection using cyclic voltammetry (CV), and two RTILs ([C2mim][NTf2] and [C4mim][PF6]) chosen for further detailed analytical studies. Long-term chronoamperometry (LTCA) was also performed to test the ability of the sensor surface for real-time gas monitoring. Both CV and LTCA gave linear calibration graphs—for CV in the 10–100% vol. range, and for LTCA in the 0.1–20% vol. range—on the SPGE. The responses on the SPGE were far superior to the commercial C-SPEs; more instability in the electrochemical responses were observed on the C-SPEs, together with some breaking-up or dissolution of the electrode surface materials. This study highlights that not all screen-printed ink formulations are compatible with RTIL solvents for longer-term electrochemical experiments, and that the choice of RTIL is also important. Overall, the low-cost SPGEs appear to be promising platforms for the detection of O2, particularly in [C4mim][PF6].

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Room temperature ionic-liquid electrochemical gas sensor array system for real-time mine safety monitoring

Cited by 9 publications

References 12 publications

Toward Tailoring of Electrolyte Additives for Efficient Alkaline Water Electrolysis: Salicylate-Based Ionic Liquids

Toward Tailoring of Electrolyte Additives for Efficient Alkaline Water Electrolysis: Salicylate-Based Ionic Liquids

Rapid measurement of room temperature ionic liquid electrochemical gas sensor using transient double potential amperometry

Screen-Printed Graphite Electrodes as Low-Cost Devices for Oxygen Gas Detection in Room-Temperature Ionic Liquids

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