scholarly journals Electron-Ion Coupling Mechanism to Construct Stable Output Performance Nanogenerator

Research ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Yan-Yuan Ba ◽  
Jing-Fu Bao ◽  
Xin-Tian Liu ◽  
Xiao-Wen Li ◽  
Hai-Tao Deng ◽  
...  
Keyword(s):  
Relative Humidity ◽  
Environmental Influence ◽  
High Energy ◽  
Coupling Mechanism ◽  
Electrical Measurements ◽  
Ion Conduction ◽  
Large Power ◽  
Output Performance ◽  
Electrostatic Induction ◽  
Electrical Output

Recently, triboelectric nanogenerators (TENGs) have been promoted as an effective technique for ambient energy harvesting, given their large power density and high energy conversion efficiency. However, traditional TENGs based on the combination of triboelectrification effect and electrostatic induction have proven susceptible to environmental influence, which intensively restricts their application range. Herein, a new coupling mechanism based on electrostatic induction and ion conduction is proposed to construct flexible stable output performance TENGs (SOP-TENGs). The calcium chloride doped-cellulose nanofibril (CaCl2-CNF) film made of natural carrots was successfully introduced to realize this coupling, resulting from its intrinsic properties as natural nanofibril hydrogel serving as both triboelectric layer and electrode. The coupling of two conductive mechanisms of SOP-TENG was comprehensively investigated through electrical measurements, including the effects of moisture content, relative humidity, and electrode size. In contrast to the conventional hydrogel ionotronic TENGs that require moisture as the carrier for ion transfer and use a hydrogel layer as the electrode, the use of a CaCl2-CNF film (i.e., ion-doped natural hydrogel layer) as a friction layer in the proposed SOP-TENG effectively realizes a superstable electrical output under varying moisture contents and relative humidity due to the compound transfer mechanism of ions and electrons. This new working principle based on the coupling of electrostatic induction and ion conduction opens a wider range of applications for the hydrogel ionotronic TENGs, as the superstable electrical output enables them to be more widely applied in various complex environments to supply energy for low-power electronic devices.

1D nanorod-like porous carbon with simultaneous high energy and large power density as a supercapacitor electrode material

RSC Advances ◽  
2016 ◽  
Vol 6 (56) ◽  
pp. 51332-51336 ◽  
Author(s):  
Yanli Tan ◽  
Qiuming Gao ◽  
Jiandong Xu ◽  
Zeyu Li
Keyword(s):  
Power Density ◽  
Porous Carbon ◽  
High Energy ◽  
Aqueous System ◽  
Porous Carbon Material ◽  
Koh Activation ◽  
Supercapacitor Electrode ◽  
Large Power ◽  
System P ◽  
Porous Coordination Polymer

1D nanorod-like porous carbon material synthesized by pyrolysis of porous coordination polymer following with KOH activation exhibits long cyclic stability and simultaneous high energy and large power density in the 6 M KOH aqueous system.

Thermal Performance Comparison between Single and Double Storey Terrace Houses in Melaka, Malaysia

2016 ◽  
Vol 835 ◽  
pp. 416-422
Author(s):  
Fahanim Abdul Rashid ◽  
Asrul Mahjuddin Ressang Aminuddin ◽  
Norafida Ab. Ghaffar
Keyword(s):  
Relative Humidity ◽  
Thermal Comfort ◽  
Case Studies ◽  
Thermal Performance ◽  
High Energy ◽  
Performance Comparison ◽  
Building Envelope ◽  
The Difference ◽  
Economic Developments ◽  
Housing Typology

Over the past decade many studies were conducted to investigate the thermal performance of terraced houses in Malaysia. It was found that this housing typology failed to address the need for thermal comfort and alternatives to the narrow frontage with deep plan have been proposed with simulated good thermal performance. Although this is good progress for new generation of terraced houses, millions of units of terraced houses are still in use and new units with the outdated existing plans continued to get built due to consistently very high demand due to progressive urbanisation and rapid economic developments. Therefore, it is imperative that the thermal comfort issue for existing terraced houses is dealt with and through this paper a comparison between single and double storey terraced houses is made through analysis of indoor environmental monitoring (ambient temperature, relative humidity and air velocity) of two (2) selected case studies in Merlimau, Melaka. Contrary to popular belief, it is found that there is no statistical difference between both sets of indoor temperature and relative humidity between the case studies. This finding is indicative of the consistent and stable temporal temperature highs and lows in a 24 hour cycle despite the difference in indoor volume and distance between the ground floor and the roof cavity. Much of the reason is due to the materiality of the terraced houses construction and unsealed and uninsulated building envelope. Therefore, further research into improving the thermal performance of existing terraced houses of any typology have to be conducted to allow thermal comfort and to reduce reliance on high energy consuming air-conditioning.

Monocharged electret based liquid-solid interacting triboelectric nanogenerator for its boosted electrical output performance

Nano Energy ◽  
2020 ◽  
Vol 70 ◽  
pp. 104541 ◽  
Author(s):  
Sunmin Jang ◽  
Moonwoo La ◽  
Sumin Cho ◽  
Yeongcheol Yun ◽  
Jun Hyuk Choi ◽  
...  
Keyword(s):  
Triboelectric Nanogenerator ◽  
Output Performance ◽  
Electrical Output

scholarly journals Insights into the origin of the high energy-conversion efficiency of F1-ATPase

2019 ◽  
Vol 116 (32) ◽  
pp. 15924-15929 ◽  
Author(s):  
Kwangho Nam ◽  
Martin Karplus
Keyword(s):  
Single Molecule ◽  
Atp Hydrolysis ◽  
Theoretical Models ◽  
Adenosine Diphosphate ◽  
Energy Conversion Efficiency ◽  
High Energy ◽  
Structural Deformation ◽  
Coupling Mechanism ◽  
Surprising Result ◽  
X Ray Crystallography

Our understanding of the rotary-coupling mechanism of F1-ATPase has been greatly enhanced in the last decade by advances in X-ray crystallography, single-molecular imaging, and theoretical models. Recently, Volkán-Kacsó and Marcus [S. Volkán-Kacsó, R. A. Marcus, Proc. Natl. Acad. Sci. U.S.A. 112, 14230 (2015)] presented an insightful thermodynamic model based on the Marcus reaction theory coupled with an elastic structural deformation term to explain the observed γ-rotation angle dependence of the adenosine triphosphate (ATP)/adenosine diphosphate (ADP) exchange rates of F1-ATPase. Although the model is successful in correlating single-molecule data, it is not in agreement with the available theoretical results. We describe a revision of the model, which leads to consistency with the simulation results and other experimental data on the F1-ATPase rotor compliance. Although the free energy liberated on ATP hydrolysis by F1-ATPase is rapidly dissipated as heat and so cannot contribute directly to the rotation, we show how, nevertheless, F1-ATPase functions near the maximum possible efficiency. This surprising result is a consequence of the differential binding of ATP and its hydrolysis products ADP and Pi along a well-defined pathway.

Amphiphobic triboelectric nanogenerators based on silica enhanced thermoplastic polymeric nanofiber membranes

Nanoscale ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 4527-4536 ◽  
Author(s):  
Shan Yan ◽  
Keyi Dong ◽  
Jianwei Lu ◽  
Wei Song ◽  
Ru Xiao
Keyword(s):  
Harsh Environment ◽  
Output Performance ◽  
Nanofiber Membranes ◽  
Triboelectric Nanogenerators ◽  
Electrical Output

The high electrical output performance and excellent droplet-repellency of amphiphobic TENG based on silica enhanced thermoplastic polymeric nanofiber membranes will make it more favorable to be utilized in a harsh environment.

scholarly journals Study of Aluminum Wires Treated with MoB2 Nanoparticles

2018 ◽  
Vol 2 (3) ◽  
pp. 50 ◽  
Author(s):  
David Florián-Algarín ◽  
Angelisse Ramos-Morales ◽  
Michelle Marrero-García ◽  
Oscar Suárez
Keyword(s):  
Pure Aluminum ◽  
High Energy ◽  
Mechanical And Thermal Properties ◽  
X Ray Diffraction ◽  
Electrical Measurements ◽  
Mechanically Alloyed ◽  
Bending Tests ◽  
High Energy Ball Mill ◽  
Energy Ball ◽  
Microstructure Of The Material

This research focuses on the fabrication of aluminum wires treated with MoB2 nanoparticles and their effect on selected mechanical and thermal properties of the wires. These nanoparticles were obtained by fragmentation in a high-energy ball mill and then mechanically alloyed with pure aluminum powder to form Al/MoB2 pellets. The pellets were added to molten pure aluminum (99.5%) at 760 °C. Afterwards, the treated melt was cast into cylindrical ingots, which were cold-formed to the desired final diameter with intermediate annealing. X-ray diffraction and optical microscopy allowed characterizing the structure and microstructure of the material. The wires underwent tensile and bending tests, as well as electrical measurements. Finally, this research demonstrated how the mechanical properties of aluminum wires can be enhanced with the addition of MoB2 nanoparticles with minimal effects on the material resistivity.

Moisture Buffering Potential of Plasters for Energy Efficiency in Modern Buildings

2017 ◽  
Author(s):  
Jan Fořt ◽  
Magdaléna Doleželová ◽  
Robert Černý
Keyword(s):  
Relative Humidity ◽  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Open Porosity ◽  
Building Materials ◽  
High Energy ◽  
Building Envelopes ◽  
Moisture Buffering ◽  
Ventilation Systems

Moisture level significantly affects durability of constructions, their thermal performance and quality of indoor air. Since building envelopes are subjected to a moisture gradient, additional ventilation systems are employed to maintain relative humidity on the desired level. Although modern advanced ventilation systems provide sufficient air exchange rate, their wider application is in conflict with sustainability development principles due to high energy demands. Moreover, according to the European legislation related to the Nearly Zero Energy Buildings (European Directives 2002/91/EC and 2010/31/EU), air tightness of building envelopes in order to provide high thermal resistance leads to large moisture loads in building interiors. Among other factors, a high level of relative humidity has negative effect on the work efficiency and health of building inhabitants. A detailed insight into building materials behavior during cyclic moisture loading was accessed within this study. The moisture buffering values of three interior plasters were investigated in order to describe influence of plasters on moderation of indoor environment. Particular materials were loaded according to the NORDTEST protocol by 8/16 h loading schema at 70/30% RH. Here, the excellent moisture buffer classification was obtained for lightweight perlite plaster (PT) with the highest total open porosity. However, contrary to the higher total open porosity of renovation plaster (PS), the core plaster (CP) achieved higher moisture buffer capacity than PS. This discrepancy refers to the influence of the pore size distribution which is, besides the total open porosity, essential for a detailed characterization of moisture buffering potential of building materials. Based on the results of Mercury intrusion porosimetry, a correlation between pore size distribution and moisture buffer value was revealed.

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