Increased power factors of organic–inorganic nanocomposite thermoelectric materials and the role of energy filtering

2017 ◽  
Vol 5 (30) ◽  
pp. 15891-15900 ◽  
Author(s):  
Zhiming Liang ◽  
Mathias J. Boland ◽  
Kamal Butrouna ◽  
Douglas R. Strachan ◽  
Kenneth R. Graham
Keyword(s):  
Thermoelectric Materials ◽  
Large Energy ◽  
Energy Barriers ◽  
Energy Filtering

Enhancements in the performance of organic–inorganic nanocomposite thermoelectrics may be obtained with both small and large energy barriers at the organic–inorganic interfaces.

Insights into the synergistic role of metal–lattice oxygen site pairs in four-centered C–H bond activation of methane: the case of CuO

2016 ◽  
Vol 6 (11) ◽  
pp. 3984-3996 ◽  
Author(s):  
Jithin John Varghese ◽  
Quang Thang Trinh ◽  
Samir H. Mushrif
Keyword(s):  
Activation Energy ◽  
Copper Oxide ◽  
Bond Activation ◽  
Lattice Oxygen ◽  
Oxide Surfaces ◽  
Energy Barriers ◽  
Metal Lattice ◽  
Oxygen Site ◽  
Site Pair

Of the three mechanisms for activation of methane on copper and copper oxide surfaces, the under-coordinated Cu–O site pair mediated mechanism on CuO surfaces has the lowest activation energy barriers.

scholarly journals Unique Role of Refractory Ta Alloying in Enhancing the Figure of Merit of NbFeSb Thermoelectric Materials

2017 ◽  
Vol 8 (1) ◽  
pp. 1701313 ◽  
Author(s):  
Junjie Yu ◽  
Chenguang Fu ◽  
Yintu Liu ◽  
Kaiyang Xia ◽  
Umut Aydemir ◽  
...  
Keyword(s):  
Thermoelectric Materials ◽  
Figure Of Merit ◽  
Unique Role

scholarly journals Hydrogen diffusion out of ruthenium—an ab initio study of the role of adsorbates

2020 ◽  
Vol 22 (15) ◽  
pp. 7935-7941
Author(s):  
Chidozie Onwudinanti ◽  
Geert Brocks ◽  
Vianney Koelman ◽  
Thomas Morgan ◽  
Shuxia Tao
Keyword(s):  
Ab Initio ◽  
Hydrogen Diffusion ◽  
Ab Initio Study ◽  
Energy Barriers ◽  
Near Surface

The energy barriers to hydrogen diffusion from near-surface interstitial sites in ruthenium are determined by the presence of adsorbates.

scholarly journals Design of Nano-Structured Micro-Thermoelectric Generator: Load Resistance and Inflections in the Efficiency

Entropy ◽  
2019 ◽  
Vol 21 (3) ◽  
pp. 224
Author(s):  
Carlos Badillo-Ruiz ◽  
Miguel Olivares-Robles ◽  
Jose Chanona-Perez
Keyword(s):  
Thermoelectric Materials ◽  
Fossil Fuels ◽  
Load Resistance ◽  
Structure Type ◽  
Temperature Dependent ◽  
Temperature Ranges ◽  
Operation Control ◽  
Micro Thermoelectric Generator ◽  
Nanostructured Thermoelectric Materials

In recent years the interest for the harvest of energy with micro thermoelectric generators ( μ TEG) has increased, due to its advantages compared to technologies that use fossil fuels. There are three ways to improve the performance of the device, by modifying its structure, type of material and operation control. In this study, the role of the load resistance R L on the performance of a μ TEG with nanostructured materials is investigated. The interaction of the load resistance with the thermoelements exhibits interesting features, arising from the coupling of the temperature-dependent electrical and thermal transport properties at different temperature ranges and the architecture of nanostructured thermoelectric materials. This coupling results in inflections on the efficiency, i.e., maximum and minimum values of the efficiency at higher temperatures, 600–900 K. We show the explicit dependence of the performance of the μ TEG in terms of the load resistance and discuss the underlying physics. The unusual features of the efficiency of nanostructured thermoelectric materials are a result of the behavior of the power factor and the nonequilibrium properties of the system. We also analyze the effect of the geometric shape of the thermoelements on the device. We determine the performance of the μ TEG, evaluating the generation power and its efficiency. The results show that the efficiency of the device can decrease or increase depending on the value of R L , while the power decreases with an increase of the load resistance.

A method to calculate the probability distribution for systems with large energy barriers

1996 ◽  
Vol 213 (1-3) ◽  
pp. 63-76 ◽  
Author(s):  
Ola Engkvist ◽  
Gunnar Karlström
Keyword(s):  
Probability Distribution ◽  
Large Energy ◽  
Energy Barriers

On the role of the termolecular reactions 2O2 + H2 → 2HO2 and 2O2 + H2 → H + HO2 + O2 in formation of the first radicals in hydrogen combustion: ab initio predictions of energy barriers

2017 ◽  
Vol 19 (3) ◽  
pp. 2175-2185 ◽  
Author(s):  
M. Monge-Palacios ◽  
Homayoon Rafatijo
Keyword(s):  
Ab Initio ◽  
Barrier Height ◽  
Hydrogen Combustion ◽  
Initial Reaction ◽  
Energy Barriers

We have identified a new initial reaction in hydrogen combustion with a low barrier height and thus competitive: 2O2 + H2 → 2HO2.

The Role of Electron-Phonon Interaction in Heavily Doped Fine-Grained Bulk Silicons as Thermoelectric Materials

2016 ◽  
Vol 2 (8) ◽  
pp. 1600171 ◽  
Author(s):  
Tiejun Zhu ◽  
Guanting Yu ◽  
Jing Xu ◽  
Haijun Wu ◽  
Chenguang Fu ◽  
...  
Keyword(s):  
Thermoelectric Materials ◽  
Phonon Interaction ◽  
Fine Grained ◽  
Electron Phonon Interaction ◽  
Heavily Doped
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