scholarly journals Neuromorphic van der Waals crystals for substantial energy generation

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Sungsoon Kim ◽  
Sangjin Choi ◽  
Hae Gon Lee ◽  
Dana Jin ◽  
Gwangmook Kim ◽  
...  
Keyword(s):  
Energy Conversion ◽  
High Speed ◽  
Rational Design ◽  
Large Scale ◽  
Ion Selectivity ◽  
Diffusion Flux ◽  
Van Der Waals ◽  
Energy Conversion Efficiency ◽  
Ion Diffusion ◽  
Nanofluidic Channels

AbstractControlling ion transport in nanofluidics is fundamental to water purification, bio-sensing, energy storage, energy conversion, and numerous other applications. For any of these, it is essential to design nanofluidic channels that are stable in the liquid phase and enable specific ions to pass. A human neuron is one such system, where electrical signals are transmitted by cation transport for high-speed communication related to neuromorphic computing. Here, we present a concept of neuro-inspired energy harvesting that uses confined van der Waals crystal and demonstrate a method to maximise the ion diffusion flux to generate an electromotive force. The confined nanochannel is robust in liquids as in neuron cells, enabling steady-state ion diffusion for hundred of hours and exhibiting ion selectivity of 95.8%, energy conversion efficiency of 41.4%, and power density of 5.26 W/m2. This fundamental understanding and rational design strategy can enable previously unrealisable applications of passive-type large-scale power generation.

scholarly journals MODEL EXPERIMENT AND FIELD TEST OF PW-OWC TYPE WAVE POWER EXTRACTING BREAKWATER

2017 ◽  
pp. 2
Author(s):  
Kenichiro Shimosako ◽  
Taro Arikawa ◽  
Masahide Takeda ◽  
Kazuyoshi Kihara ◽  
Yasushi Hosokawa ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Conversion Efficiency ◽  
Field Test ◽  
Large Scale ◽  
Energy Conversion Efficiency ◽  
Primary Energy ◽  
Wave Power ◽  
Medium Scale ◽  
The Past ◽  
Wave Power Conversion

Many research studies on wave power conversion have been conducted in Japan over the past 30 years, but the outgrowth of these studies have yet to be put to practical use. In this study, medium-scale and large-scale hydraulic model experiments as well as prototype field test on a new oscillating water column with a projecting wall (PW-OWC) wave power extracting breakwater were carried out in order to investigate the efficiency of energy conversion. The primary energy conversion efficiency of the PW-OWC converter is about 10% larger than that of the standard OWC type used in the medium-scale experiments. The primary energy conversion efficiency of the large scale experiments is about 20-30-% smaller than that of the medium scale experiments. The secondary energy conversion efficiency ranges from 0.20 to 0.42 and becomes small when the wave period is short and the wave height is large.

Research Progress of Quantum Dot Solar Cell

2013 ◽  
Vol 320 ◽  
pp. 693-697
Author(s):  
Wei Cui ◽  
Chong Wang ◽  
Yu Yang
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Quantum Dot ◽  
Energy Conversion ◽  
Conversion Efficiency ◽  
Large Scale ◽  
Energy Conversion Efficiency ◽  
Research Progress ◽  
Cds Quantum Dot ◽  
Sensitized Solar Cells

The solar energy is the most promising energy to solve energy crisis and environmental problem. Quantum dot can be applied to solar cells in two structures of QDSC to improve the energy conversion efficiency. The two structures are p-i-n type QDSC and quantum dots sensitized solar cells. The energy conversion efficiency of p-i-n type QDSC may increase up to 45%. Both CdSe and CdS quantum dot can be used as the sensitizer of the QDSSC and each of them has its demerits and merits, but the conversion efficiency of QDSSC is low if they were used respectively. Thus, in order to overcome their demerits respectively, we could try to combine their merits. QDSC is the most promising technique to solve the problems of solar cell. But before large-scale application their efficiency and stability should be improved.

scholarly journals Characterization of energy conversion of multiferroic PFN and PFN:Mn

2013 ◽  
Vol 7 (4) ◽  
pp. 167-173 ◽  
Author(s):  
Lucjan Kozielski ◽  
Dariusz Bochenek
Keyword(s):  
Energy Conversion ◽  
High Speed ◽  
Ferroelectric Properties ◽  
Pyrochlore Phase ◽  
Energy Conversion Efficiency ◽  
Modern Technology ◽  
Point Of View ◽  
Synthesis Process ◽  
Multiferroic Materials

Characterization of energy conversion of multiferroic materials is concerned with multifunctional properties of materials, a topic that is fascinating from the scientific point of view and important for the modern technology. The complex characterization of multiferroic structures suffers at present from lack of a systematic experimental approach and deficiency of multifunctional magnetoelectric properties testing capabilities. Compactness and high frequency energy conversion capacity are the main reasons of invention and improvement of sophisticated materials which are prepared for high-speed computer memories and broadband transducer devices. As a consequence, one can easily notice an intense search for new materials for generation, transformation and amplification of magnetic and electric energies. In this scenario, the combination of excellent piezoelectric and magnetic properties makes lead iron niobate Pb(Fe1/2Nb1/2)O3 (PFN) an attractive host material for application in integrated magnetoelectric energy conversion applications. PFN multiferroic materials are attractive for commercial electroceramics due to high value of dielectric permittivity and magnetoelectric coefficients as well as relatively easy synthesis process. However, synthesis of PFN ceramics is mostly connected with formation of the secondary unwanted pyrochlore phase associated with dramatic decrease of ferroelectric properties. The authors have successfully reduced this negative phenomenon by Mn doping and finally present high piezoelectric and magnetoelectric energy conversion efficiency in fabricated PMFN ceramics.

Composition Engineering of Organic–Inorganic Perovskites Prepared in Air for Highly Efficient Energy Conversion

2020 ◽  
Vol 15 (5) ◽  
pp. 592-598
Author(s):  
Yang Li ◽  
Ruiquan Liao
Keyword(s):  
Solar Energy ◽  
Energy Conversion ◽  
Conversion Efficiency ◽  
Large Scale ◽  
Carrier Transport ◽  
Perovskite Solar Cells ◽  
Clean Energy ◽  
Energy Conversion Efficiency ◽  
Fabrication Process ◽  
Scale Production

The global energy crisis significantly raises the research on renewable energy materials and devices both in academic and industrial community. Besides the electrochemical energy such as batteries, the solar energy is another choice to develop renewable clean energy. During the last ten years, the perovskite solar cells (PSCs) has been a hot research topic and developed fast. However, large-scale production of PSCs is still hindered by the high cost of their fabrication process, because the perovskite films are known to be sensitive to oxygen and water. Therefore, developing a composition engineering in air for PSCs with high solar energy conversion efficiency is urgently required in the field. Herein, it is found that the crystallization and morphology of CH3NH3PbI3 (MAPbI3) perovskite films prepared in air are dependent on the processing methods. The perovskite grain size becomes larger when the concentration of CH3NH3I (MAI) solution was increased from 20 mg/mL to 70 mg/mL, which is beneficial for charge carrier transport and device performance. Thanks to the optimal perovskite fabrication process, the champion PSC has been fabricated in open air and it shows a power conversion efficiency (PCE) of 14.9%. More importantly, the PSC fabricated with our method shows good stability. This work provides an effective composition engineering to fabricate PSCs in air with both high PCE and stability.

Van der Waals bilayer antimonene: A promising thermophotovoltaic cell material with 31% energy conversion efficiency

Nano Energy ◽  
2017 ◽  
Vol 38 ◽  
pp. 561-568 ◽  
Author(s):  
Meiqiu Xie ◽  
Shengli Zhang ◽  
Bo Cai ◽  
Yu Gu ◽  
Xuhai Liu ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Conversion Efficiency ◽  
Van Der Waals ◽  
Energy Conversion Efficiency ◽  
Cell Material

scholarly journals Investigation on Electromagnetic Models of High-Speed Solenoid Valve for Common Rail Injector

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Jianhui Zhao ◽  
Liyun Fan ◽  
Peng Liu ◽  
Leonid Grekhov ◽  
Xiuzhen Ma ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Magnetic Materials ◽  
Conversion Efficiency ◽  
High Speed ◽  
Energy Conversion Efficiency ◽  
Solenoid Valve ◽  
Electromagnetic Energy ◽  
Soft Magnetic Materials ◽  
Soft Magnetic ◽  
Drive Current

A novel formula easily applied with high precision is proposed in this paper to fit the B-H curve of soft magnetic materials, and it is validated by comparison with predicted and experimental results. It can accurately describe the nonlinear magnetization process and magnetic saturation characteristics of soft magnetic materials. Based on the electromagnetic transient coupling principle, an electromagnetic mathematical model of a high-speed solenoid valve (HSV) is developed in Fortran language that takes the saturation phenomena of the electromagnetic force into consideration. The accuracy of the model is validated by the comparison of the simulated and experimental static electromagnetic forces. Through experiment, it is concluded that the increase of the drive current is conducive to improving the electromagnetic energy conversion efficiency of the HSV at a low drive current, but it has little effect at a high drive current. Through simulation, it is discovered that the electromagnetic energy conversion characteristics of the HSV are affected by the drive current and the total reluctance, consisting of the gap reluctance and the reluctance of the iron core and armature soft magnetic materials. These two influence factors, within the scope of the different drive currents, have different contribution rates to the electromagnetic energy conversion efficiency.

scholarly journals Analysis of Dynamic Characteristics and Power Losses of High Speed on/off Valve with Pre-Existing Control Algorithm

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4901
Author(s):  
Qi Zhong ◽  
Xiele Wang ◽  
Geng Xie ◽  
Huayong Yang ◽  
Cheng Yu ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Dynamic Characteristics ◽  
Hydraulic System ◽  
High Speed ◽  
Control Algorithm ◽  
Energy Conversion Efficiency ◽  
Power Losses ◽  
Closing Time ◽  
Energy Characteristics ◽  
Overall Performance

A high-speed on/off valve (HSV) is generally the core component of a digital hydraulic transmission system. Therefore, its dynamic characteristics often restrict the overall performance of the digital hydraulic system. Most of the current studies focus on the optimization on the dynamic characteristics or the energy characteristics, few studies have comprehensively considered the two characteristics of the valve together. In this paper, a pre-existing control algorithm (PECA) is proposed to improve the dynamic characteristics of the HSV, and simultaneously optimize the power losses of the HSV to improve its energy conversion efficiency. The results show that, compared with the traditional single-voltage driven strategy, the opening time of the PECA decreases by 29.4%, the closing time decreases by 59.6%, and the energy conversion rate increases by 7.9%.

scholarly journals Triboelectric Nanogenerators for Harvesting Wind Energy: Recent Advances and Future Perspectives

Energies ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6949
Author(s):  
Jiaqi Li ◽  
Jie Chen ◽  
Hengyu Guo
Keyword(s):  
Energy Harvesting ◽  
Wind Energy ◽  
Energy Conversion ◽  
Large Scale ◽  
Coupling Effect ◽  
Mechanical Energy ◽  
Energy Conversion Efficiency ◽  
Green Energy ◽  
Structure Design ◽  
Triboelectric Nanogenerator

Throughout the world, wind energy is widely distributed as one of the most universal energy sources in nature, containing a gigantic reserve of renewable and green energy. At present, the main way to capture wind energy is to use an electromagnetic generator (EMG), but this technology has many limitations; notably, energy conversion efficiency is relatively low in irregular environments or when there is only a gentle breeze. A triboelectric nanogenerator (TENG), which is based on the coupling effect of triboelectrification and electrostatic induction, has obvious advantages for mechanical energy conversion in some specific situations. This review focuses on wind energy harvesting by TENG. First, the basic principles of TENG and existing devices’ working modes are introduced. Second, the latest research into wind energy-related TENG is summarized from the perspectives of structure design, self-power sensors and systems. Then, the potential for large-scale application and hybridization with other energy harvesting technologies is discussed. Finally, future trends and remaining challenges are anticipated and proposed.

Sign in / Sign up

Export Citation Format

Share Document