scholarly journals Computational Design of Thermoelectric Alloys Through Optimization of Transport and Dopability

2022 ◽  
Author(s):  
Jiaxing Qu ◽  
Adam Balvanz ◽  
Sviatoslav Baranets ◽  
Svilen Bobev ◽  
Prashun Gorai

Alloying is a common technique to optimize the functional properties of materials for thermoelectrics, photovoltaics, energy storage etc. Designing thermoelectric (TE) alloys is especially challenging because it is a multi-property...

2021 ◽  
Author(s):  
Jiaxing Qu ◽  
Adam Balvanz ◽  
Sviatoslav Baranets ◽  
Svilen Bobev ◽  
Prashun Gorai

Alloying is a common technique to optimize the functional properties of materials for thermoelectrics, photovoltaics, energy storage etc. Designing thermoelectric (TE) alloys is especially challenging because it is a multi-property optimization problem, where the properties that contribute to high TE performance are interdependent. In this work, we develop a computational framework that combines first-principles calculations with alloy and point defect modeling to identify alloy compositions that optimize the electronic, thermal, and defect properties. We apply this framework to design n-type Ba2(1-x)Sr2xCdP2 Zintl thermoelectric alloys. Our predictions of the crystallographic properties such as lattice parameters and site disorder are validated with experiments. To optimize the conduction band electronic structure, we perform band unfolding to sketch the effective band structures of alloys and find a range of compositions that facilitate band convergence and minimize alloy scattering of electrons. We assess the n-type dopability of the alloys by extending the standard approach for computing point defect energetics in ordered structures. Through the application of this framework, we identify an optimal alloy composition range with the desired electronic and thermal transport properties, and n-type dopability. Such a computational framework can also be used to design alloys for other functional applications beyond TE.


2020 ◽  
Vol 13 (1) ◽  
Author(s):  
David Adekoya ◽  
Shangshu Qian ◽  
Xingxing Gu ◽  
William Wen ◽  
Dongsheng Li ◽  
...  

Abstract Carbon nitrides (including CN, C2N, C3N, C3N4, C4N, and C5N) are a unique family of nitrogen-rich carbon materials with multiple beneficial properties in crystalline structures, morphologies, and electronic configurations. In this review, we provide a comprehensive review on these materials properties, theoretical advantages, the synthesis and modification strategies of different carbon nitride-based materials (CNBMs) and their application in existing and emerging rechargeable battery systems, such as lithium-ion batteries, sodium and potassium-ion batteries, lithium sulfur batteries, lithium oxygen batteries, lithium metal batteries, zinc-ion batteries, and solid-state batteries. The central theme of this review is to apply the theoretical and computational design to guide the experimental synthesis of CNBMs for energy storage, i.e., facilitate the application of first-principle studies and density functional theory for electrode material design, synthesis, and characterization of different CNBMs for the aforementioned rechargeable batteries. At last, we conclude with the challenges, and prospects of CNBMs, and propose future perspectives and strategies for further advancement of CNBMs for rechargeable batteries.


2021 ◽  
Vol 16 ◽  
Author(s):  
Sarushi Rastogi ◽  
Vasudha Sharma ◽  
Meenal Gupta ◽  
Pushpa Singh ◽  
Patrizia Bocchetta ◽  
...  

: The concept of graphene in a carbon framework has given rise to enormous improvements to the specific properties of materials. Notably, the combination of graphene with polymeric, metallic and ceramic materials has significantly improved mechanical resistance, electrical and thermal conductivity, and thermal stability of the resulting composite material. In this review, we discuss outstanding literature on graphene-based composite materials for biomedical and related energy storage applications with emphasis to the synthesis techniques and improved properties of the nanocomposite materials due to graphene addition.


Author(s):  
ANINA ANJU B ◽  
Soma Dutta

Abstract The intricacies in identifying the appropriate material system for energy storage applications have been the biggest struggle of the scientific community. Countless contributions by researchers worldwide have now helped us identify the possible snags and limitations associated with each material/method. This review intends to briefly discuss state of the art in energy storage applications of dielectric materials such as linear dielectrics, ferroelectrics, anti-ferroelectrics, and relaxor ferroelectrics. Based on the recent studies, we find that the eco-friendly lead-free dielectrics, which have been marked as inadequate to compete with lead-based systems, are excellent for energy applications. Moreover, some promising strategies to improve the functional properties of dielectric materials are discussed.


2021 ◽  
Vol 346 ◽  
pp. 02040
Author(s):  
Vladimir Kostin ◽  
Danila Ksenofontov ◽  
Olga Vasilenko ◽  
Alexander Byzov

The purpose of this work is a comparative study of the possibilities of various types of coercimeters to assess the functional properties of ferromagnetic materials. Conducted research have shown that the limitation of the maximum measured value of the coercive force using an attached transducer with a U-shaped electromagnet is due to the lower value of the magnetic resistance of the tested workpiece. The upper limit of measurements of the coercive force using a two-pole transducer is determined by the magnitude of the tangential component of the magnetic field only by the possibility of magnetizing the tested object.


2020 ◽  
Vol 36 (2) ◽  
pp. 96-102
Author(s):  
Daniel J. Brinkmann ◽  
Harald Koerger ◽  
Albert Gollhofer ◽  
Dominic Gehring

Footwear bending stiffness is known to positively affect performance in agility maneuvers due to improved energy storage and propulsion based on a stiffer foot–shoe complex. However, the functional properties of the forefoot and midfoot differ. Therefore, the present study investigates the effect of the interface of longitudinal bending stiffness and the ratio of forefoot to midfoot bending stiffness on agility performance and foot biomechanics. A total of 18 male soccer players performed 2 agility tasks in footwear conditions that were systematically modified in forefoot and midfoot bending stiffness. Results revealed that higher longitudinal bending stiffness caused more foot exorotation at the initial ground contact (P < .05), less torsion (P < .001), and an anterior shift in the point of force application during push off (P = .01). In addition, the authors observed decreased forefoot bending (P < .05) and increased torsion (P < .01) in footwear with a higher forefoot–midfoot ratio. Finally, the agility performance was significantly impaired by 1.3% in the condition with the highest forefoot–midfoot ratio (P < .01). The high forefoot–midfoot ratio, that is, a stiff forefoot in combination with a soft midfoot, seemed to shift the flex line from anterior to posterior that may explain the performance impairment.


2018 ◽  
Vol 5 (4) ◽  
pp. 711-741 ◽  
Author(s):  
Valeriy Ishchuk ◽  
Danil Kuzenko ◽  
Vladimir Sobolev ◽  
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Author(s):  
Tejs Vegge ◽  
Jakob G. Howalt ◽  
Steen Lysgaard ◽  
Jón Steinar G. Mýrdal ◽  
Nicolai Bork ◽  
...  

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