Electromechanical Properties of Polymer Electrolyte‐Based Stretchable Supercapacitors

Cole, Daniel P.; Reddy, Arava Leela Mohana; Hahm, Myung Gwan; McCotter, Ryan; Hart, Amelia H. C.; Vajtai, Róbert; Ajayan, Pulickel M.; Karna, Shashi P.; Bundy, Mark

doi:10.1002/aenm.201300844

Cited by 24 publications

(12 citation statements)

References 33 publications

(31 reference statements)

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“…During indentation, the force and displacement are continuously monitored with nanoNewton and nanometer resolution, respectively, making the technique attractive for applications in which small volumes of materials need to be examined. Standard NI theory assumes specimens are flat, isotropic half‐spaces, although tests on substrate‐film systems, composite materials, samples with edges, and graded materials have been demonstrated with appropriate modifications. Indentation studies accounting for viscoelastic behavior of materials have also been demonstrated; a particularly challenging issue for applying depth‐sensing indentation to a material with time‐dependent mechanical behavior is creep, which can complicate the assumed linear elastic response during the initial stages of unloading …”

Section: Introductionmentioning

confidence: 99%

Interfacial mechanical behavior of 3D printed ABS

Cole

Riddick

Jaim

et al. 2016

J of Applied Polymer Sci

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We describe an experimental approach for characterizing the local mechanical behavior of acrylonitrile butadiene styrene (ABS) structures processed through fused deposition modeling. ABS test specimens processed in various build orientations were subject to multiscale mechanical tests as well as local morphology and chemical analyses. Instrumented indentation, local dynamic mechanical analysis, and atomic force microscopy tests were used to explore the mechanical behavior and morphology of build surfaces and weld interfaces. An interfacial stiffening effect was found for the majority of the specimens tested, with up to a 40% increase in the indentation elastic modulus measured with respect to the build surfaces. Raman spectroscopy mapping of the interfacial areas revealed $30% less butadiene/styrene and butadiene/acrylonitrile ratios with respect to analysis of the build surfaces. The results provide insight into the multiscale behavior of additive manufactured structures and offer the potential to guide processing-structureproperty understanding of these materials.

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Section: Introductionmentioning

confidence: 99%

Interfacial mechanical behavior of 3D printed ABS

Cole

Riddick

Jaim

et al. 2016

J of Applied Polymer Sci

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“…The technique has been used to characterize the elastic modulus, elastic-plastic stress-strain curves, creep properties, and hardness of a wide range of materials and structures, including traditional steels [50], film-substrate systems [51], functionally graded structures [52,53], polymers and polymer composites [54][55][56], and individual microfibers [57]. In the current study, the local stiffness properties of the beam samples near the fixed boundary were examined using nanoindentation (Figure 8).…”

Section: Local Mechanical Characterizationmentioning

confidence: 99%

Detection of fatigue damage precursor using a nonlinear vibration approach

Habtour

Cole

Riddick

et al. 2016

Struct. Control Health Monit.

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SUMMARYA nonlinear dynamic methodology is developed for detecting and estimating fatigue damage precursor in isotropic metal structures, prior to fatigue crack initiation, based on measurement of changes in the structure nonlinear response to harmonic base excitation. As an example, a damage precursor feature was extracted for cantilever beams by quantifying the reduction in the nonlinear stiffness because of localized microscopic material softening. The nonlinear dynamic analytical model parametrically tracks changes in the nonlinear structural stiffening as a function of the structural response and the loading cycles. Experimental results are obtained by exciting the base of cantilever beams at various amplitude levels. At high response amplitudes, the beams experience three competing simultaneous nonlinear dynamic mechanisms: (i) stiffening because of high response amplitude at the fundamental mode; (ii) softening because of inertial forces; and (iii) softening because of localized microscopic material damage caused by cyclic micro-plasticity. The third mechanism-a potential precursor to fatigue crack initiation in the structure-resulted in a cumulative softening because of early accumulation of cyclic fatigue damage and is the focus of this study. The loading intensity and the number of cycles influenced the relative contribution of these dynamic mechanisms. Nanoindentation studies near the beam clamped boundary were conducted to confirm the fatigue degradation in the local mechanical properties as a function of loading cycles. The proposed detection method is simple to implement and detects the presence of damage precursors but lacks the resolution to discern spatial distributions of the damage intensity. Based on prior knowledge of the structural dynamic characteristics of the beam and using the proposed methodology, damage level and stiffness reduction can be detected and estimated based on changes in the nonlinear structural response. The nonlinear stiffness term in the equation of motion is found to be very sensitive to the proposed fatigue damage precursor, making it an effective method for monitoring structural degradation prior to crack developments. The proposed methodology provides new insights and constitutes a significant step toward the development of new inspection techniques.

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“…Among the family of carbon nanomaterials, CNFs, CNTs and graphene have achieved great attention due to their unique features such as a large surface area to volume ratio, good electronic conductivity, excellent stability, etc. In addition, they are found to be useful in manufacturing various nanocomposites since they can form entangled network during their preparation to improve the electrode conductivity [33]. The technological advancements in the field of nanoscience helped the developments of high power EDLCs, but the lack of energy density remains a big challenge.…”

Section: Strategies For High-performance Supercapacitorsmentioning

confidence: 99%

Novel mesoporous electrode materials for symmetric, asymmetric and hybrid supercapacitors

et al. 2019

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Electrochemical capacitors or supercapacitors have achieved great interest in the recent past due to their potential applications ranging from microelectronic devices to hybrid electric vehicles. Supercapacitors can provide high power densities but their inherently low energy density remains a great challenge. The high-performance supercapacitors utilize large electrode surface area for electrochemical double-layer capacitance and/or pseudocapacitance. To enhance the performance of supercapacitors, various strategies have been adopted such as electrode nanostructuring, hybrid electrode designs using nanocomposite electrodes and hybrid supercapacitor (HSC) configurations. Nanoarchitecturing of electrode-active materials is an effective way of enhancing the performance of supercapacitors as it increases the effective electrode surface area for enhanced electrode/electrolyte interaction. In this review, we focus on the recent developments in the novel electrode materials and various hybrid designs used in supercapacitors for obtaining high specific capacitance and energy density. A family of electrode-active materials including carbon nanomaterials, transition metal-oxides, transition metal-nitrides, transition metal-hydroxides, electronically conducting polymers, and their nanocomposites are discussed in detail. The HSC configurations for attaining enhanced supercapacitor performance as well as strategies to integrate with other microelectronic devices/ wearable fabrics are also included.

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Electromechanical Properties of Polymer Electrolyte‐Based Stretchable Supercapacitors

Cited by 24 publications

References 33 publications

Interfacial mechanical behavior of 3D printed ABS

Interfacial mechanical behavior of 3D printed ABS

Detection of fatigue damage precursor using a nonlinear vibration approach

Novel mesoporous electrode materials for symmetric, asymmetric and hybrid supercapacitors

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