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You searched for +publisher:"University of Texas – Austin" +contributor:("Yu, Guihua (Assistant professor)"). Showing records 1 – 3 of 3 total matches.

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1. Liu, Borui. Conducting polymer hydrogels for high-performance electrochemical devices.

Degree: Materials Science and Engineering, 2014, University of Texas – Austin

Conducting polymer hydrogels (CPHs) is a class of unique materials that synergize the advantages of conducting polymers (CPs) and polymer hydrogels together. It has been employed in many high-performance electrochemical devices for years, such as energy storage and biosensors. However, large limitations of applying CPHs into the abovementioned areas have been facing the researcher for a long time, mainly due to the difficulties from complicated materials synthesis and untenable nanostructures for potential applications. The drawbacks of previously reported CPHs have put numerous disadvantages onto their applications, partially because they have, for example, high prices, untunable microscale or nanoscale architectures, environmentally hazardous properties, and unscalable and time-consuming synthesis processes. In this thesis, we proposed a novel route for carrying out CPHs by one-step organics synthesis at ambient conditions. The CPHs have hierarchically porous nanostructures crosslinked in a three-dimensional (3D) way, which enable its stable mechanical, unique chemical and physical properties, and outstanding electrochemical properties for potential applicability in long-term energy storage devices and highly sensitive biosensors. With highly controllable nanostructures of the CPHs, our novel concept and material system could possibly be utilized in a broad range of electrochemical applications, including but not limited to lithium-ion batteries (LIBs) electrodes, electrochemical capacitors (ECs), biofuel cells, medical electrodes, printable electronic devices, and biosensors. Advisors/Committee Members: Yu, Guihua (Assistant professor) (advisor).

Subjects/Keywords: Conducting polymer hydrogels; Energy storage; Analytical sensing; Li-ion batteries; Supercapacitors; Biosensors

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Liu, B. (2014). Conducting polymer hydrogels for high-performance electrochemical devices. (Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/26380

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Liu, Borui. “Conducting polymer hydrogels for high-performance electrochemical devices.” 2014. Thesis, University of Texas – Austin. Accessed May 24, 2019. http://hdl.handle.net/2152/26380.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Liu, Borui. “Conducting polymer hydrogels for high-performance electrochemical devices.” 2014. Web. 24 May 2019.

Vancouver:

Liu B. Conducting polymer hydrogels for high-performance electrochemical devices. [Internet] [Thesis]. University of Texas – Austin; 2014. [cited 2019 May 24]. Available from: http://hdl.handle.net/2152/26380.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Liu B. Conducting polymer hydrogels for high-performance electrochemical devices. [Thesis]. University of Texas – Austin; 2014. Available from: http://hdl.handle.net/2152/26380

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


University of Texas – Austin

2. -5816-4011. Flexible all-gel-based supercapacitors.

Degree: Mechanical Engineering, 2016, University of Texas – Austin

Flexible energy storage devices are important sources of power for flexible electronics such as role up screens and wearable electronics. Most of the flexible energy storage devices are based on using either carbon nanomaterials or using composite electrodes (carbon nanomaterials with conductive polymers). The main drawbacks of these approaches are: the cost, fabrication time consuming and difficulty of synthesizing proper carbon nanomaterials. An alternative promising approach is using the 3D nanostructured conductive polymer hydrogel, which exhibits good electrochemical performance and good mechanical properties. 3D nanostructured hydrogel has a porous nanostructured network, which has many advantages such as providing short pathways for electron transport and increasing the electrode-electrolyte penetration depth via pores. In addition, the porous structure can contribute to release chain’s strains due to the volume change during the charge-discharge processes. For energy storage devices that work under periodically critical engineering stresses, these hydrogels may suffer from micro cracks, which lead to degraded electrochemical performance over time, so increasing the flexibility of 3D nanostructured hydrogel is very important for flexible energy storage devices. In this thesis, we propose a new idea of synthesizing hybrid gel electrodes that are composed of 3D nanostructured hydrogel and small percentages of nonconductive gel (PANI+PEO). The conductive hydrogel was contributed to provide good electrochemical performance, and the nonconductive gel was used as a plasticizer to increase the flexibility of the hybrid gel electrodes. Adding small percentage of the plasticizer polymer in a controllable manner has kept high electrochemical performance, and greatly enhanced the mechanical properties of the flexible gel electrodes. In order to approve our idea, we designed three gel supercapacitors based on the differences in the PEO content in the hybrid gel electrodes, and then we performed a wide comparison among them in terms of electrochemical performance and the mechanical behavior. Advisors/Committee Members: Yu, Guihua (Assistant professor) (advisor), Li, Wei (committee member).

Subjects/Keywords: Conductive hydrogel; Nonconductive gel; Flexible electrodes; Supercapacitors

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

-5816-4011. (2016). Flexible all-gel-based supercapacitors. (Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/69086

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

-5816-4011. “Flexible all-gel-based supercapacitors.” 2016. Thesis, University of Texas – Austin. Accessed May 24, 2019. http://hdl.handle.net/2152/69086.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

-5816-4011. “Flexible all-gel-based supercapacitors.” 2016. Web. 24 May 2019.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Vancouver:

-5816-4011. Flexible all-gel-based supercapacitors. [Internet] [Thesis]. University of Texas – Austin; 2016. [cited 2019 May 24]. Available from: http://hdl.handle.net/2152/69086.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

-5816-4011. Flexible all-gel-based supercapacitors. [Thesis]. University of Texas – Austin; 2016. Available from: http://hdl.handle.net/2152/69086

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Not specified: Masters Thesis or Doctoral Dissertation


University of Texas – Austin

3. Shi, Ye, Ph. D. Rational design of 3D nanostructured conductive polymer gels for electrochemical energy storage and responsive electronic devices.

Degree: Materials Science and Engineering, 2017, University of Texas – Austin

This work presents the rational design and synthesis of conductive polymer gels (CPGs) using doping molecules as crosslinkers. Molecules with multiple functional groups are used to crosslink the conductive polymer chains, leading to CPGs with 3D networked structures. These dopant molecules crosslinked CPGs exhibit both high electrical and ionic conductivities since they construct heavily doped and interconnected polymer network for electron transport and hierarchically porous structure for ion diffusion. The chemical and physical properties of dopant molecules crosslinked CPGs can be facilely tuned by controlling the dopants and synthetic conditions. With improved electrochemical properties, CPGs have been applied as an electrode material in supercapacitors and as a binder material in lithium ion batteries. CPGs establish a continuous network to promote the transport of electrons, provide short ion diffusion path and large surface area for redox reactions, and construct a porous architecture with intrinsic elasticity to accommodate the volume change, thus showing high capacitance and rate capability as supercapacitor electrode materials. High elasticity derived by the structure of CPGs further enables highly flexible supercapacitor. CPGs were also adopted as bifunctional binder materials for lithium ion battery electrodes, acting as both polymeric binder and a conductive additive. The gel framework based electrode exhibits greatly improved rate and cyclic performance owing to improved electronic and ionic transport. In addition, both inorganic and organic components are uniformly distributed within the electrode due to the polymer coating. The robust framework further provides mechanical strength to support active electrode materials and improves the long-term electrochemical stability. Combined with other functional gels, CPGs have been also adopted for smart electrochemical devices. Based on CPGs and a thermoresponsive electrolyte system, electrochemical energy storage devices with thermal self-protection behavior are developed. The smart electrolyte system is achieved by employing a commercially available thermoplastic elastomer, Pluronic, which shows a fast sol-gel transition process upon heating. The gelation of Pluronic solution based electrolytes significantly inhibits the migration of ions, leading to a nearly 100% decrease in specific capacitance. The responsive behavior is highly reversible and tunable. Various electrode materials and conductive ions are compatible with this system. Finally, multifunctional hybrid gel materials based on CPGs are developed by introducing a second responsive polymeric network, forming an interpenetrating double network structure. A highly thermoresponsive and conductive hybrid gel is synthesized by in situ polymerization of CPGs within PNIPAM matrix and a room-temperature self-healing hybrid gel is prepared by introducing a supramolecular gel into PPy gel framework. Advisors/Committee Members: Yu, Guihua (Assistant professor) (advisor), Ellison, Christopher J. (committee member), Lu, Nanshu (committee member), Li, Wei (committee member).

Subjects/Keywords: Conductive polymer gel; Responsive electronics; Electrochemical energy storage

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Shi, Ye, P. D. (2017). Rational design of 3D nanostructured conductive polymer gels for electrochemical energy storage and responsive electronic devices. (Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/60387

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Shi, Ye, Ph D. “Rational design of 3D nanostructured conductive polymer gels for electrochemical energy storage and responsive electronic devices.” 2017. Thesis, University of Texas – Austin. Accessed May 24, 2019. http://hdl.handle.net/2152/60387.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Shi, Ye, Ph D. “Rational design of 3D nanostructured conductive polymer gels for electrochemical energy storage and responsive electronic devices.” 2017. Web. 24 May 2019.

Vancouver:

Shi, Ye PD. Rational design of 3D nanostructured conductive polymer gels for electrochemical energy storage and responsive electronic devices. [Internet] [Thesis]. University of Texas – Austin; 2017. [cited 2019 May 24]. Available from: http://hdl.handle.net/2152/60387.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Shi, Ye PD. Rational design of 3D nanostructured conductive polymer gels for electrochemical energy storage and responsive electronic devices. [Thesis]. University of Texas – Austin; 2017. Available from: http://hdl.handle.net/2152/60387

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.