Diamond-coated silicon wires for supercapacitor applications in ionic liquids

Gao, Fang; Lewes-Malandrakis, Georgia; Wolfer, Marco; Müller‐Sebert, W.; Gentile, P.; Aradilla, David; Schubert, Thomas; Nebel, Christoph E.

doi:10.1016/j.diamond.2014.10.009

Cited by 75 publications

(49 citation statements)

References 26 publications

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“…The gravimetric SC of 1.03 F/g~20 mV/s, 0.95 F/g~50 mV/s, and 0.90 F/g ~100 mV/s was obtained, normalized to the weight of both TiN and Si-NR. Those results are better than silicon nanowire supercapacitor (36.7 F/cm 2 ) [26], and carbon coated silicon nanowire electrode (105 F/cm 2 ) [41], also compare well with the results for diamond coated silicon nanowire electrode (1.5 mF/cm 2 ) [42]. As for Si/TiN electrode, 0.21, 0.18, and 0.15 mF/cm 2 were delivered at the corresponding test conditions.…”

Section: Resultssupporting

confidence: 79%

Nano fabricated silicon nanorod array with titanium nitride coating for on-chip supercapacitors

Øhlckers

Müller

et al. 2016

Electrochemistry Communications

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We demonstrate high aspect ratio silicon nanorod arrays by cyclic deep reactive ion etching (DRIE) process as a scaffold to enhance the energy density of a Si-based supercapacitor. By unique atomic layer deposition (ALD) technology, a conformal nano layer of TiN was deposited on the silicon nanorod arrays as the active material.The TiN coated silicon nanorods as a supercapacitor electrode lead to a 6 times improvement in capacitance compared to flat TiN film electrode.

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Section: Resultssupporting

confidence: 79%

Nano fabricated silicon nanorod array with titanium nitride coating for on-chip supercapacitors

Øhlckers

Müller

et al. 2016

Electrochemistry Communications

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“…18,25,27,40 Three of these publications were published in the last two years. As mentioned above, the earliest report on the surface capacitance of porous diamond comes from the year 2000, with a value of ∼200 μF cm −2 .…”

Section: For Supercapacitor Applicationsmentioning

confidence: 97%

Diamond-Based Supercapacitors: Realization and Properties

Gao

Nebel

2015

ACS Appl. Mater. Interfaces

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In this Spotlight on Applications, we describe our recent progress on the fabrication of surface-enlarged boron-doped polycrystalline diamond electrodes, and evaluate their performance in supercapacitor applications. We begin with a discussion of the fabrication methods of porous diamond materials. The diamond surface enlargement starts with a top-down plasma etching method. Although the extra surface area provided by surface roughening or nanostructuring provides good outcome for sensing applications, a capacitance value <1 mF cm or a surface-enlargement factor <100 fail to meet the requirement of a practical supercapacitor. Driven by the need for large surface areas, we recently focused on the tempated-growth method. We worked on both supported and free-standing porous diamond materials to enhance the areal capacitance to the "mF cm" range. With our newly developed free-standing diamond paper, areal capacitance can be multiplied by stacking multilayers of the electrode material. Finally, considering the fact that there is no real diamond-based supercapacitor device up to now, we fabricated the first prototype pouch-cell device based on the free-standing diamond paper to evaluate its performance. The results reveal that the diamond paper is suitable for operation in high potential windows (up to 2.5 V) in aqueous electrolyte with a capacitance of 0.688 mF cm per layer of paper (or 0.645 F g). Impedance spectroscopy revealed that the operation frequency of the device exceeds 30 Hz. Because of the large potential window and the ability to work at high frequency, the specific power of the device reached 1 × 10 W kg. In the end, we made estimations on the future target performance of diamond supercapacitors based on the existing information.

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“…To improve C s of diamond EDLCs with respect to higher C g , generating diamond electrodes with large surface areas is a promising and efficient approach. Surface nanostructuring of diamond using top-down technique [9][10][11] , overgrowth of other nanostructures using bottom-up approach [13][14] , and surface coating of diamond with other nanomaterials 15 have been proved to be possible methodologies. Moreover, due to the wider working potential window of BDD (e.g.…”

Section: Performance Of Diamond Edlcsmentioning

confidence: 99%

Electrochemical Supercapacitors from Diamond

Yang

Zhuang

et al. 2015

J. Phys. Chem. C

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Boron doped diamond has been utilized as an electrode material to construct an electric double layer capacitor (EDLC) as well as an electrode support to form a pseudocapacitor. In a 1.0 M NaSO 4 solution, the capacitance of diamond EDLC is in the range of 3.6-7.0 µF cm -2 , comparable with those of EDLCs based on other carbon materials. During a charge/discharge process for 1000 cycles at a scan rate of 100 mV s -1 , the capacitance only decreases 5%, indicating high stability and a long life-time of such an EDLC. To improve the capacitance of diamond EDLCs, diamond was coated with a MnO 2 film to construct a pseudosupercapacitor. The MnO 2 films were electrodeposited at a constant potential of 0.9 V vs. Ag/AgCl in 0.2 M MnSO 4 solution. The mass of MnO 2 deposited per unit area, so-called the area density, calculated from the deposition charge, was controlled via the deposition time. The MnO 2 films were characterized using various techniques like SEM, XPS, and Raman spectroscopy, etc. In a 1.0 M NaSO 4 solution, the capacitance of the MnO 2 /diamond based pseudosupercapacitor rises with an increase of the mass of MnO 2 on diamond. Its maximum capacitance was found to be reached at a MnO 2 area density of 24 µg cm -2 . The capacitance obtained from voltammetry is 384 µF, or 326 F g -1 at a scan rate of 10 mV s -1 , which is comparable with the value of 406 µF, or 349 F g -1 , obtained from charge/discharge process at a current density of 3 A g -1 in the potential range 0 to 0.8 V. The capacitance was reduced by 34% after 1000 subsequent charge/discharge cycles carried out at a scan range of 100 mV s -1 .The comparison of the performance of the MnO 2 /diamond pseudosupercapacitor with that of those pseudosupercapacitors based on MnO 2 and other carbon materials indicates that diamond could be suitable for electrochemical supercapacitor applications.

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Diamond-coated silicon wires for supercapacitor applications in ionic liquids

Cited by 75 publications

References 26 publications

Nano fabricated silicon nanorod array with titanium nitride coating for on-chip supercapacitors

Nano fabricated silicon nanorod array with titanium nitride coating for on-chip supercapacitors

Diamond-Based Supercapacitors: Realization and Properties

Electrochemical Supercapacitors from Diamond

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