Methane Recognition and Quantification by Differential Capacitance at the Hydrophobic Ionic Liquid-Electrified Metal Electrode Interface

We present a method to identify and quantify methane using a hydrophobic ionic liquid (IL)–electrified metal electrode interface by electrochemical impedance spectroscopy. We investigated the mechanisms of the responses of the IL-electrified electrode interface to the exposure of methane and other interfering gases (H2, C6H12, SO2, NO, NO2, CO2, O2, H2O). Our results show that at low frequency the IL-electrified electrode interface shows a predominantly capacitive response. The IL-electrode double layer (EDL) was found to be the primary response layer while the transition zone and bulk region of the IL-electrode interface contribute little to the overall signal change. For recognition and quantification of methane using the Langmuir adsorption model and measurement of differential capacitance change, an optimum EDL interface structure was found to form at a specific DC bias potential. The cumulative results shown in this work suggest that an ideal IL-electrode interface can be formed by varying IL structure and applied DC bias electrode potential for a specific analyte and that the semi-ordered structure of IL-electrified interface can act as a recognition element for the sensitive and selective adsorption and detection of gaseous molecules. © 2013 The Electrochemical Society. [DOI: 10.1149/2.138306jes] All rights reserved.

[1]  S. Baldelli,et al.  Influence of Water on the Orientation of Cations at the Surface of a Room-Temperature Ionic Liquid: A Sum Frequency Generation Vibrational Spectroscopic Study , 2003 .

[2]  P. Taberna,et al.  Anomalous Increase in Carbon Capacitance at Pore Sizes Less Than 1 Nanometer , 2006, Science.

[3]  Richard G Compton,et al.  Electrochemical oxidation of nitrite and the oxidation and reduction of NO2 in the room temperature ionic liquid [C2mim][NTf2]. , 2007, The journal of physical chemistry. B.

[4]  I. Harrison,et al.  Microcanonical unimolecular rate theory at surfaces. III. Thermal dissociative chemisorption of methane on Pt(111) and detailed balance. , 2005, The Journal of chemical physics.

[5]  R. Compton,et al.  SO(2) saturation of the room temperature ionic liquid [C(2)mim][NTf(2)] much reduces the activation energy for diffusion. , 2009, The journal of physical chemistry. B.

[6]  Kun Cui,et al.  Dual-Responsive Ionically Assembled Fluorescent Nanoparticles from Copoly(Ionic Liquid) for Temperature Sensor , 2012 .

[7]  Xiangqun Zeng,et al.  Ionic liquid high-temperature gas sensor array. , 2006, Analytical chemistry.

[8]  Yuyuan Tian,et al.  A hybrid electrochemical-colorimetric sensing platform for detection of explosives. , 2009, Journal of the American Chemical Society.

[9]  Prem K. Kilaru,et al.  Density and Surface Tension Measurements of Imidazolium-, Quaternary Phosphonium-, and Ammonium-Based Room-Temperature Ionic Liquids: Data and Correlations , 2007 .

[10]  A. Kornyshev,et al.  Double layer in ionic liquids: overscreening versus crowding. , 2010, Physical review letters.

[11]  S. Baldelli,et al.  Surface structure at the ionic liquid-electrified metal interface. , 2008, Accounts of chemical research.

[12]  J. Stetter,et al.  Amperometric gas sensors--a review. , 2008, Chemical reviews.

[13]  K. Jaruwongrungsee,et al.  A review of monolithic multichannel quartz crystal microbalance: a review. , 2011, Analytica chimica acta.

[14]  E. Maginn,et al.  Molecular dynamics simulations of CO2 at an ionic liquid interface: adsorption, ordering, and interfacial crossing. , 2010, The journal of physical chemistry. B.

[15]  Xiangqun Zeng,et al.  Ionic liquids as electrolytes for the development of a robust amperometric oxygen sensor. , 2011, Analytical chemistry.

[16]  John M. Slattery,et al.  The dielectric response of room-temperature ionic liquids: effect of cation variation. , 2007, The journal of physical chemistry. B.

[17]  R. Atkin,et al.  Pronounced structure in confined aprotic room-temperature ionic liquids. , 2009, The journal of physical chemistry. B.

[18]  Y. Gogotsi,et al.  Materials for electrochemical capacitors. , 2008, Nature materials.

[19]  V. Koch,et al.  Differential Capacitance Measurements in Solvent‐Free Ionic Liquids at Hg and C Interfaces , 1997 .

[20]  Guokai Cui,et al.  Highly efficient SO2 capture by dual functionalized ionic liquids through a combination of chemical and physical absorption. , 2012, Chemical communications.

[21]  Sheila N. Baker,et al.  The large scale synthesis of pure imidazolium and pyrrolidinium ionic liquids , 2007 .

[22]  J. Schneider,et al.  Image-potential-induced surface states at the Ag(111)-electrolyte interface , 1988 .

[23]  Matthew K. Tam,et al.  Double Layer Structure of Ionic Liquids at the Au(111) Electrode Interface: An Atomic Force Microscopy Investigation , 2011 .

[24]  John Ralston,et al.  Differential capacitance of the double layer at the electrode/ionic liquids interface. , 2010, Physical chemistry chemical physics : PCCP.

[25]  Daniel Knapp,et al.  Density functional theory studies of methane dissociation on anode catalysts in solid-oxide fuel cells: Suggestions for coke reduction , 2007 .

[26]  Rob Atkin,et al.  An in situ STM/AFM and impedance spectroscopy study of the extremely pure 1-butyl-1-methylpyrrolidinium tris(pentafluoroethyl)trifluorophosphate/Au(111) interface: potential dependent solvation layers and the herringbone reconstruction. , 2011, Physical chemistry chemical physics : PCCP.

[27]  Mark E. Orazem,et al.  Electrochemical Impedance Spectroscopy: Orazem/Electrochemical , 2008 .

[28]  S. Pei,et al.  Sum frequency generation study on the orientation of room-temperature ionic liquid at the graphene–ionic liquid interface , 2011 .

[29]  S. Baldelli.  Probing electric fields at the ionic liquid-electrode interface using sum frequency generation spectroscopy and electrochemistry. , 2005, The journal of physical chemistry. B.

[30]  Xiangqun Zeng,et al.  Methane interactions with polyaniline/butylmethylimidazolium camphorsulfonate ionic liquid composite. , 2008, Langmuir : the ACS journal of surfaces and colloids.

[31]  Jinghong Li,et al.  Electrochemical gate-controlled charge transport in graphene in ionic liquid and aqueous solution. , 2009, Journal of the American Chemical Society.

[32]  Peter Wasserscheid,et al.  Reversible physical absorption of SO2 by ionic liquids. , 2006, Chemical communications.

[33]  S. Baldelli,et al.  A Sum Frequency Generation Study of the Room-Temperature Ionic Liquid−Titanium Dioxide Interface , 2008 .

[34]  T. Ohsaka,et al.  Measurements of differential capacitance in room temperature ionic liquid at mercury, glassy carbon and gold electrode interfaces , 2007 .

[35]  R. Torresi,et al.  The sulfur dioxide-1-butyl-3-methylimidazolium bromide interaction: drastic changes in structural and physical properties. , 2007, The journal of physical chemistry. B.

[36]  Chao Wu,et al.  First-principles-guided design of ionic liquids for CO2 capture. , 2012, Physical chemistry chemical physics : PCCP.

[37]  Hongtao Yuan,et al.  Hydrogenation-induced surface polarity recognition and proton memory behavior at protic-ionic-liquid/oxide electric-double-layer interfaces. , 2010, Journal of the American Chemical Society.

[38]  Bruno Scrosati,et al.  Ionic-liquid materials for the electrochemical challenges of the future. , 2009, Nature materials.

[39]  K. Lust,et al.  Influence of anion composition and size on the double layer capacitance for Bi(111)|room temperature ionic liquid interface , 2010 .

[40]  N. Dossi,et al.  A Membrane Free Amperometric Gas Sensor Based on Room Temperature Ionic Liquids for the Selective Monitoring of NOx , 2012 .

[41]  T. Ohsaka,et al.  Measurements of Differential Capacitance at Mercury/Room-Temperature Ionic Liquids Interfaces , 2007 .

[42]  Haifeng Dong,et al.  Carbon capture with ionic liquids: overview and progress , 2012 .

[43]  Dermot Diamond,et al.  Electrochemical transistors with ionic liquids for enzymatic sensing. , 2010, Chemical communications.

[44]  Sheng Dai,et al.  The importance of ion size and electrode curvature on electrical double layers in ionic liquids. , 2011, Physical chemistry chemical physics : PCCP.

[45]  Richard G Compton,et al.  Use of room temperature ionic liquids in gas sensor design. , 2004, Analytical chemistry.

[46]  J. Hallett,et al.  Salts dissolved in salts: ionic liquid mixtures , 2011 .

[47]  P. Werle,et al.  The limits of signal averaging in atmospheric trace-gas monitoring by tunable diode-laser absorption spectroscopy (TDLAS) , 1993 .

[48]  T. Ohsaka,et al.  Capacitance Measurements in a Series of Room-Temperature Ionic Liquids at Glassy Carbon and Gold Electrode Interfaces , 2008 .

[49]  M. Bazant,et al.  Steric effects in the dynamics of electrolytes at large applied voltages. I. Double-layer charging. , 2006, Physical review. E, Statistical, nonlinear, and soft matter physics.

[50]  A. Bond,et al.  Dissolved argon changes the rate of diffusion in room temperature ionic liquids: effect of the presence and absence of argon and nitrogen on the voltammetry of ferrocene , 2009 .

[51]  R. Atkin,et al.  AFM and STM Studies on the Surface Interaction of [BMP]TFSA and [EMIm]TFSA Ionic Liquids with Au(111) , 2009 .

[52]  Timothy P. Lodge,et al.  A Unique Platform for Materials Design , 2008, Science.

[53]  Haoran Li,et al.  Highly efficient and reversible SO2 capture by tunable azole-based ionic liquids through multiple-site chemical absorption. , 2011, Journal of the American Chemical Society.

[54]  S. Baldelli,et al.  On the Arrangement of Ions in Imidazolium-Based Room Temperature Ionic Liquids at the Gas−Liquid Interface, Using Sum Frequency Generation, Surface Potential, and Surface Tension Measurements , 2010 .

[55]  G. Schatz,et al.  Anion effects in the scattering of CO2 from the room-temperature ionic liquids [bmim][BF4] and [bmim][Tf2N]: insights from quantum mechanics/molecular mechanics trajectories. , 2012, The journal of physical chemistry. B.

[56]  R. Atkin,et al.  The interface ionic liquid(s)/electrode(s): in situ STM and AFM measurements. , 2012, Faraday discussions.

[57]  Hermann Ludwig Ferdinand von Helmholtz.  Some laws concerning the distribution of electric currents in volume conductors with applications to experiments on animal electricity , 2004, Proc. IEEE.

[58]  R. Compton,et al.  Electrochemistry of Hydrogen in the Room Temperature Ionic Liquid 1-Butyl-3-methylimidazolium Bis(trifluoromethylsulfonyl)imide: Dissolved Hydrogen "Lubricates" Diffusional Transport , 2011 .

[59]  G. W. Meindersma,et al.  Solvent properties of functionalized ionic liquids for CO2 absorption , 2007 .

[60]  C. Angell,et al.  Parallel developments in aprotic and protic ionic liquids: physical chemistry and applications. , 2007, Accounts of chemical research.

[61]  B. Shklovskii,et al.  Anomalously large capacitance of an ionic liquid described by the restricted primitive model. , 2010, Physical review. E, Statistical, nonlinear, and soft matter physics.

[62]  Albert P. Pisano,et al.  A review of recent progress in sensing of gas concentration by impedance change , 2011 .

[63]  Sheila N. Baker,et al.  Fluorescence studies of protein thermostability in ionic liquids. , 2004, Chemical communications.

[64]  I. Harrison,et al.  Microcanonical unimolecular rate theory at surfaces. I. Dissociative chemisorption of methane on Pt(111) , 2003 .

[65]  V. W. Lau,et al.  Tuning the photocatalytic activity of CdS nanocrystals through intermolecular interactions in ionic-liquid solvent systems. , 2012, Chemistry.

[66]  D. Kolb.  Electrochemical Surface Science , 2001 .

[67]  Stefano Passerini,et al.  Hysteresis effects in the potential-dependent double layer capacitance of room temperature ionic liquids at a polycrystalline platinum interface , 2009, 0912.0809.

[68]  Guonan Chen,et al.  Ultrasensitive gaseous NH3 sensor based on ionic liquid-mediated signal-on electrochemiluminescence. , 2012, The Analyst.

[69]  R. Compton,et al.  Tuning solute redox potentials by varying the anion component of room temperature ionic liquids. , 2012, Chemical communications.

[70]  Christopher R. Arumainayagam,et al.  Dissociative chemisorption of methane on Pt(111) , 1989 .

[71]  Richard G. Compton,et al.  Electroreduction of Sulfur Dioxide in Some Room-Temperature Ionic Liquids , 2008 .

[72]  F. Llovell,et al.  Modeling the absorption of weak electrolytes and acid gases with ionic liquids using the soft-SAFT approach. , 2012, The journal of physical chemistry. B.

[73]  M. Maroncelli,et al.  Solvation and rotational dynamics of coumarin 153 in ionic liquids: comparisons to conventional solvents. , 2007, The journal of physical chemistry. B.

[74]  D. Macfarlane,et al.  Ionic liquids based on imidazolium, ammonium and pyrrolidinium salts of the dicyanamide anion , 2002 .