Fabrication and characterization of novel silicon-compatible high-density capacitors

Sharma, Himani; Sethi, Kanika; Raj, P. Markondeya; Tummala, Rao

doi:10.1007/s10854-011-0431-9

Cited by 10 publications

(1 citation statement)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…13 Since then interest in electrostatic capacitors (ESCs) at the nanoscale has increased substantially. 14,[48][49][50][51][52] Furthermore, because they store strictly electronic charge on conducting surfaces, ESCs have exceptional power handling capability, reaching the megawatt range, and easily surpassing that of electrochemical storage devices (supercapacitors or batteries). Nanosynthesis has enabled these nanoscale devices to be fabricated in parallel arrays that perform effectively and reliably as ESCs.…”

Section: Electrostatic Capacitorsmentioning

confidence: 99%

Perspective: hybrid systems combining electrostatic and electrochemical nanostructures for ultrahigh power energy storage

Haspert

Gillette

Lee

et al. 2013

Energy Environ. Sci.

View full text Add to dashboard Cite

Time-varying energy profiles of renewable sources, electric vehicles, end user demands, portable devices, novel military applications and more, require high power as well as high energy density in storage systems. Electrochemical capacitors (EECs), with higher power than batteries, benefit from nanostructured geometries that further increase their power capability. Nanostructured electrostatic capacitors (ESCs) are known to have much higher power capability than EECs, though lower energy density. The physical and chemical mechanisms by which EECs and ESCs function in charge/discharge are completely different, as are their electrical specifications and constraints. We consider for the first time how the contrasting characters of electrochemical and electrostatic nanostructured capacitors might be combined in a heterogeneous hybrid circuit to achieve better power and energy performance than either device alone. While the benefits of hybrid circuits have been previously considered for electrochemical devices -i.e., battery and electrochemical capacitorthis perspective article demonstrates for the first time that hybrid storage circuits of heterogeneous devices can exploit the very high power of electrostatic devices, in concert with electrochemical devices. Using response surface models from our own experimental results with nanostructured ESC and ECC devices, we develop a hybrid simulation model combining the two types of devices, recognizing the intrinsic nonlinearities and constraints of each. We demonstrate that charge capture by the ESC and subsequent rapid transfer to the ECC compensates for the lower power capability of the ECC while avoiding energy loss by ESC leakage currents. Although more sophisticated models and simulations are warranted in the future, these initial results underscore the opportunity that ESC devices and hybrid circuits offer for storage applications which require ultrahigh power performance. Broader contextHigh to ultra-high power energy storage, along with suitably large energy density, is a critical focus of materials and systems research for renewable energy integration, power levelling, transportation, wireless and portable electronics applications and more. While new materials and new material combinations have been able to achieve signicant improvements, combinations of different devices with complementary performance parameters may be able to compensate for some of the limitations of each individual storage device type. In order to take advantage of recent research advances synergistic combinations of devices are needed which can manage widely varying mechanisms of charge storage, non-linearities, and different failure regimes. While hybrid combinations of batteries and supercapacitorsboth electrochemical deviceshave been studied before, no combination of an electrochemical and an electrostatic device has been reported. Its fundamental energy-power characteristics and prospective applications are explored and discussed for high to ultra-high power energy storage device in this p...

show abstract