scholarly journals Effect of Crystalline Microstructure Evolution on Thermoelectric Performance of PEDOT : PSS Films

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Xuan Huang ◽  
Liang Deng ◽  
Fusheng Liu ◽  
Qichun Zhang ◽  
Guangming Chen
Keyword(s):  
Microstructure Evolution ◽  
Rational Design ◽  
Carrier Transport ◽  
Recent Decade ◽  
Skin Layer ◽  
Organic Polymer ◽  
Poly Styrene Sulfonate ◽  
Polymer Thermoelectric ◽  
Crystalline Microstructure

Although organic polymer thermoelectric (TE) materials have witnessed explosive advances in the recent decade, the molecular mechanism of crystallization engineering of TE performance, even for the most successful polymer of poly(3,4-ethylenedioxythiophene) : poly(styrene sulfonate) (PEDOT : PSS), is still far from clear. Here, we deepen the understanding of the role of annealing-induced crystalline microstructure evolution on TE performance of the PEDOT : PSS film with thickness of 10 μm, which is usually more effective than thin ones in applications. Annealed at optimized temperature of 220°C, the film displays a power factor of 162.5 times of that of the pristine film before annealing. The enhanced TE performance is associated with the changes of crystallographic and morphologic microstructures, including increased crystallinity and crystal grain size, a domain morphology transformation from granular to crystalline nanofibril, and reduced insulating PSS in the skin layer. These variances facilitate the carrier transport by a transition from 3D to 1D hopping, reduce the activation energy, and improve the carrier mobility. The mechanism of crystallization engineering reported here can be conceptually extended to other TE polymers and guides the future rational design of preparation principles for organic and composite TE materials.

scholarly journals The contemporary role of metastasectomy in the management of metastatic RCC

2021 ◽  
Author(s):  
Zachary Feuer ◽  
Jacob I. Taylor ◽  
William C. Huang
Keyword(s):  
Composite Films ◽  
Recent Decade ◽  
Single Walled Carbon Nanotube ◽  
Flexible Polymer ◽  
Potential Applications ◽  
Temperature Ranges ◽  
Mechanical Performances ◽  
Poly Styrene Sulfonate ◽  
Polymer Thermoelectric

Significant progress has been achieved for flexible polymer thermoelectric (TE) composites in the recent decade due to their potential application in wearable devices and sensors. In sharp contrast with the booming TE studies at room temperature, the TE performances of polymer TE composites received relatively less attention despite the significance for the application of TE composites in the high temperature environments. The TE and mechanical performances of flexible poly (3,4 ethylenedioxythiophene):poly(styrene sulfonate)/single-walled carbon nanotube (PEDOT:PSS/SWCNT) composite films with ionic liquid (IL) (refer to as “PEDOT:PSS/SWCNT-IL”) at high temperatures are studied in the present work. The resultant composite film shows the increasing TE performances with increasing temperatures and SWCNT contents. The maximum value of the power factor reaches 301.35 W m-1 K-2 at 470 K for the PEDOT:PSS/SWCNT-IL composite. Besides, the addition of IL can improve the elongation at break of composites compared to the IL-free composites. This work promotes the advance of flexible polymer TE composites and widens the potential applications at different temperature ranges.

Effect of High Salt Concentration on Ion Clustering and Transport in Polymer Solid Electrolytes: a Molecular Dynamics Study of PEO-LiTFSI

2018 ◽  
Author(s):  
Nicola Molinari ◽  
Jonathan P. Mailoa ◽  
Boris Kozinsky
Keyword(s):  
Polymer Electrolyte ◽  
Salt Concentration ◽  
Rational Design ◽  
Material System ◽  
Ion Dynamics ◽  
High Concentration ◽  
Anion Clusters ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

<div> <div> <div> <p>The model and analysis methods developed in this work are generally applicable to any polymer electrolyte/cation-anion combination, but we focus on the currently most prominent polymer electrolyte material system: poly(ethylene) oxide/Li- bis(trifluoromethane) sulfonamide (PEO + LiTFSI). The obtained results are surprising and challenge the conventional understanding of ionic transport in polymer electrolytes: the investigation of a technologically relevant salt concentration range (1 - 4 M) revealed the central role of the anion in coordinating and hindering Li ion movement. Our results provide insights into correlated ion dynamics, at the same time enabling rational design of better PEO-based electrolytes. In particular, we report the following novel observations. 1. Strong binding of the Li cation with the polymer competes with significant correlation of the cation with the salt anion. 2. The appearance of cation-anion clusters, especially at high concentration. 3. The asymmetry in the composition (and therefore charge) of such clusters; specifically, we find the tendency for clusters to have a higher number of anions than cations.</p> </div> </div> </div>

Effect of High Salt Concentration on Ion Clustering and Transport in Polymer Solid Electrolytes: a Molecular Dynamics Study of PEO-LiTFSI

2018 ◽  
Author(s):  
Nicola Molinari ◽  
Jonathan P. Mailoa ◽  
Boris Kozinsky
Keyword(s):  
Polymer Electrolyte ◽  
Salt Concentration ◽  
Rational Design ◽  
Material System ◽  
Ion Dynamics ◽  
High Concentration ◽  
Anion Clusters ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

<div> <div> <div> <p>The model and analysis methods developed in this work are generally applicable to any polymer electrolyte/cation-anion combination, but we focus on the currently most prominent polymer electrolyte material system: poly(ethylene) oxide/Li- bis(trifluoromethane) sulfonamide (PEO + LiTFSI). The obtained results are surprising and challenge the conventional understanding of ionic transport in polymer electrolytes: the investigation of a technologically relevant salt concentration range (1 - 4 M) revealed the central role of the anion in coordinating and hindering Li ion movement. Our results provide insights into correlated ion dynamics, at the same time enabling rational design of better PEO-based electrolytes. In particular, we report the following novel observations. 1. Strong binding of the Li cation with the polymer competes with significant correlation of the cation with the salt anion. 2. The appearance of cation-anion clusters, especially at high concentration. 3. The asymmetry in the composition (and therefore charge) of such clusters; specifically, we find the tendency for clusters to have a higher number of anions than cations.</p> </div> </div> </div>

scholarly journals Role of heat balance on the microstructure evolution of cold spray coated AZ31B with AA7075

2021 ◽  
Author(s):  
Bahareh Marzbanrad ◽  
Mohammad Hadi Razmpoosh ◽  
Ehsan Toyserkani ◽  
Hamid Jahed
Keyword(s):  
Cold Spray ◽  
Microstructure Evolution ◽  
Heat Balance

A selenium-containing ruthenium complex as a cancer radiosensitizer, rational design and the important role of ROS-mediated signalling

2015 ◽  
Vol 51 (13) ◽  
pp. 2637-2640 ◽  
Author(s):  
Zhiqin Deng ◽  
Lianling Yu ◽  
Wenqiang Cao ◽  
Wenjie Zheng ◽  
Tianfeng Chen
Keyword(s):  
Rational Design ◽  
Ruthenium Complex ◽  
Ruthenium Complexes

We have described the rational design of selenium-containing ruthenium complexes and their use as cancer radiosensitizers through regulating ROS-mediated pathways.

Recent advances in organic polymer thermoelectric composites

2017 ◽  
Vol 5 (18) ◽  
pp. 4350-4360 ◽  
Author(s):  
Guangming Chen ◽  
Wei Xu ◽  
Daoben Zhu
Keyword(s):  
Thermoelectric Performance ◽  
Organic Polymer ◽  
Recent Advances ◽  
Polymer Thermoelectric

In this review, recent advances in organic polymer thermoelectric composites, mainly focusing on the preparation strategies to achieve enhanced thermoelectric performance, have been discussed.

Novel melamine-based porous organic polymers: synthesis, characterizations, morphology modifications, and their applications in lithium-sulfur batteries

2021 ◽  
Author(s):  
Haiyang Liu ◽  
Jiaxing Wang ◽  
Miao SUN ◽  
Yu Wang ◽  
Runing Zhao ◽  
...  
Keyword(s):  
High Performance ◽  
Rational Design ◽  
Specific Capacity ◽  
High Capacity ◽  
Lithium Ion ◽  
Organic Polymer ◽  
Energy Storage Devices ◽  
Shuttle Effect ◽  
Physical Constraints ◽  
Lithium Sulfur

Abstract Lithium-sulfur (Li-S) batteries have been considered to be one of the most promising energy storage devices in the next generation. However, the insulating properties of sulfur and the shuttle effect of soluble lithium polysulfides (LiPSs) seriously hinder the practical application of Li-S batteries. In this paper, a novel porous organic polymer (HUT3) was prepared based on the polycondensation between melamine and 1,4-phenylene diisocyanate. The micro morphology of HUT3 was improved by in-situ growth on different mass fractions of rGO (5%, 10%, 15%), and the obtained HUT3-rGO composites were employed as sulfur carriers in Li-S batteries with promoted the sulfur loading ratio and lithium ion mobility. Attributed to the synergistic effect of the chemisorption of polar groups and the physical constraints of HUT3 structure, HUT3-rGO/S electrodes exhibits excellent capacity and cyclability performance. For instance, HUT3-10rGO/S electrode exhibits a high initial specific capacity of 950 mAh g-1 at 0.2 C and retains a high capacity of 707 mAh g-1 after 500 cycles at 1 C. This work emphasizes the importance of the rational design of the chemical structure and opens up a simple way for the development of cathode materials suitable for high-performance Li-S batteries.

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