Polyaniline as a cathode for O2 reduction—Kinetics of the reaction with H2O2 and use of the polymer in a model H2O2 fuel cell

Doubova, L.; Mengoli, G.; Musiani, Marco; Valcher, S.

doi:10.1016/0013-4686(89)87009-4

Cited by 43 publications

(23 citation statements)

References 12 publications

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“…It has been extensively demonstrated that CPs such as polyaniline (PANI) and polypyrrole (PPy) can act as polymeric catalysts capable of promoting the oxygen reduction catalysis on electrode surfaces. As an example, Musiani and co‐workers demonstrated the use of PANI as an effective electrocatalytic cathode for oxygen reduction in aqueous sulfuric acid under fuel cell operation conditions displaying good electrochemical reversibility of the redox reaction . It is now accepted that among a broad variety of CPs, PANI and PPy have higher electrocatalytic activity in ORR than other polymers .…”

Section: Mass Increments Determined By Qcm For Different Composite Elmentioning

confidence: 99%

Metal‐Organic Frameworks Help Conducting Polymers Optimize the Efficiency of the Oxygen Reduction Reaction in Neutral Solutions

Rafti

Marmisollé

Azzaroni

2016

Adv Materials Inter

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respect, the theoretical work of Barzukov and co-workers [ 7 ] suggests that the catalysis of the ORR on CPs can be ascribed to the weakening of molecular O O bonds during the chemisorption of oxygen on the polymer surface. For example, in the case of carbon black/PPy composites, the onset potential for ORR (−0.34 V) is more anodic than that observed in carbon blackcoated electrodes (−0.60 V). However, the ORR current densities are highly dependent on the loading of the PPy catalyst because of the low oxygen diffusion in the electrode surface. [ 13 ] In this regard, one of the major challenges for the optimization of electrochemical energy-conversion devices (e.g., metal-air batteries), is to increase the O 2 reduction and evolution effi ciencies, thus requiring the development of new effective electrocatalytic interfacial architectures compatible with the operation in aqueous electrolytes using air as the oxygen source.This point is where MOFs come into the picture as a valuable tool to engineer the oxygen uptake properties of the electrochemical interface in order to increase its concentration on the electrode surface. MOFs represent an emergent and versatile class of microporous materials constituted by an infi nite arrangement of metal (or metal cluster) centers coordinated via noncovalent interactions with organic linkers. [ 14,15 ] A great deal of effort has been devoted also to test strategies directed to control MOFs' growth and to synthesize mixed composites and supported fi lms, [ 16 ] whose distinctive properties have given rise to an increasing number of interesting applications (e.g., mixed matrix membranes for pervaporation, [ 17 ] or thin fi lms for sensor and separation technologies [ 18 ] ).Very recently, Díaz et al. [ 19 ] reported a comprehensive work describing the selective gas adsorption of fi lms constituted by ZIF-8 MOF (a member of a subclass of MOFs known as Zeolitic Imidazole Frameworks, constituted of Co 2+ or Zn 2+ metal ions tetrahedrally coordinated by imidazole-based linkers). It was shown that selectivity of O 2 adsorption over N 2 is close to 6, thus confi rming that ZIF-8 would undergo preferential uptake of O 2 even in the case of atmospheric O 2 :N 2 composition.Taking into account these concepts and being aware of the outstanding features of gas storage exhibited by metal-organic frameworks, we took this new paradigm one step further by integrating MOFs onto CPs and using them as oxygen reservoirs sitting atop the electrocatalytic active material. However, it is important to consider that such interfacial architectures require the tailored production and organization of complex matter displaying spatially addressed chemistry using different wet chemical processes. Therefore, to achieve this goal it is important to test strategies for the controlled preparation of multicomponent nanostructures on surfaces. Research efforts The oxygen reduction reaction (ORR), where molecular oxygen is electrocatalytically reduced on the electrode surface, plays a decisive role in energy conver...

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Section: Mass Increments Determined By Qcm For Different Composite Elmentioning

confidence: 99%

Metal‐Organic Frameworks Help Conducting Polymers Optimize the Efficiency of the Oxygen Reduction Reaction in Neutral Solutions

Rafti

Marmisollé

Azzaroni

2016

Adv Materials Inter

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“…Polyaniline (PANI), a preeminent electrically conducting polymer with tunable electrical conductivity, has been the subject of intense study due to its application potential in diverse fields such as microelectronics [1][2][3][4][5], displays [6,7], electrodes (for example, [8][9][10]), sensors and actuators [11][12][13][14], membranes for gas separations [15][16][17], solar cells [18,19], fuel cells [20,21], and electromagnetic interference (EMI) shielding [22,23]. Also, PANI undergoes a nonredox reversible doping/dedoping process [24] based on simple acid-base chemistry, making possible control over properties such as optical activity, electrical conductivity, and sensor activity, thus making it unique in the class of conjugated polymers.…”

Section: Introductionmentioning

confidence: 99%

A polyaniline-containing filter paper that acts as a sensor, acid, base, and endpoint indicator and also filters acids and bases

Dutta

Sarma

Chowdhury

et al. 2005

Journal of Colloid and Interface Science

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confidence: 99%

The Effect of Film Thickness and Growth Method on Polyaniline Film Properties

Dinh

Vanýsek

Birss

1999

J. Electrochem. Soc.

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There has been significant interest in the electrochemical properties of polyaniline (PANI) films on electrode surfaces, largely because of the many promising applications of PANI in electrochromic devices, 1,2 as supercapacitive materials, as intercalating electrodes in advanced batteries, 3,4 for electrocatalysis of certain reactions, [5][6][7] in microelectronic devices, 8 etc.The properties of PANI films have been extensively studied by many different methods. However, despite the numerous past studies of PANI films, there are still many remaining questions regarding their electrochemical growth mechanism, their structure (particularly at the nanometer scale), and even their electrical properties. Although the impedance technique has been employed quite frequently as a tool for investigating PANI film properties, 9-17 many of these past studies have focused on the characterization of a single film at different potentials, or of several films of different thickness, but grown by one technique. No single study has been directed at comparing the electrochemical properties of PANI films formed at different rates to different thicknesses at different substrates, etc. As a consequence, there is some uncertainty regarding the dependence of film properties on experimental variables. In fact, many past studies have focused more on the description of the impedance data without much emphasis on interpretation.Therefore, one of the key objectives of this work was to examine the PANI film impedance response over a wide range of potentials for films formed to various thicknesses while employing several different electrochemical growth conditions on Au and Pt substrates. The principal goal of these studies has been to obtain a better understanding of the growth and structural properties of these films from a careful variation of the experimental parameters within a single controlled study.In this paper, the electrochemical properties of PANI films, grown by two different methods (type I and type II films) to various thicknesses and studied by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS), are examined systematically. The structural and interfacial properties of the two types of films are compared, for the first time, by tracking the rate of the hydrogen evolution reaction (HER) with time of PANI film growth. It is shown that type II films are more porous, both in the bulk of the film and at the base of film pores, and are more capacitive than type I films. Type II films also undergo structural changes during film growth, while type I films remain relatively uniform. This work is considered important in terms of providing knowledge regarding how the growth parameters affect PANI film properties and also insight into how to design PANI films with the desired structure, porosity, capacitance, and stability characteristics. ExperimentalCells and electrodes.-The details of the solutions and the instrumentation used for carrying out CV and ac impedance measurements have been described elsewhere. 18 Sta...

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Polyaniline as a cathode for O2 reduction—Kinetics of the reaction with H2O2 and use of the polymer in a model H2O2 fuel cell

Cited by 43 publications

References 12 publications

Metal‐Organic Frameworks Help Conducting Polymers Optimize the Efficiency of the Oxygen Reduction Reaction in Neutral Solutions

Metal‐Organic Frameworks Help Conducting Polymers Optimize the Efficiency of the Oxygen Reduction Reaction in Neutral Solutions

A polyaniline-containing filter paper that acts as a sensor, acid, base, and endpoint indicator and also filters acids and bases

The Effect of Film Thickness and Growth Method on Polyaniline Film Properties

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