Li–S Batteries: All‐Solid‐State Printed Bipolar Li–S Batteries (Adv. Energy Mater. 40/2019)

Kim, Se‐Hee; Kim, Jung‐Hui; Cho, Sung‐Ju; Lee, Sang Young

doi:10.1002/aenm.201970154

Cited by 96 publications

(138 citation statements)

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“…I ph , I dark , ε ox , and d are photocurrent, dark current, the dielectric permittivity, and thickness of the insulating SiO 2 layer, respectively (see the Supporting Information). [45] Based on the transfer data shown in Figure 5a, an N d = 7.1 × 10 12 cm −2 can be calculated under zero V g , which is almost the same as that derived from the Raman spectra. The increased doping density caused by the photogenerated carriers suppresses x w by around 100 times (around 60 nm, as shown in the Supporting Information).…”

Section: Interface Interactionssupporting

confidence: 70%

“…The on/off ratio of the graphene-only device is ≈3.5, which is comparable to previous reports. [34,37,44] The positive Dirac voltage (V Dirac ) of 60 V indicates a p-type character of the pristine graphene, [37,45] which is in agreement with the Raman shift. The photoresponse of the pristine graphene is negligible in the white light illumination condition, as shown in Figure S6 in the Supporting Information.…”

Section: Interface Interactionsmentioning

confidence: 65%

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Single‐Crystal Hybrid Perovskite Platelets on Graphene: A Mixed‐Dimensional Van Der Waals Heterostructure with Strong Interface Coupling

Liu

You

Faraji

et al. 2020

Adv Funct Materials

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Van der Waals (vdW) heterostructures open up excellent prospects in electronic and optoelectronic applications. In this work, mixed‐dimensional metal‐halide perovskite/graphene heterostructures are prepared through selective growth of CH3NH3PbBr3 platelets on patterned single‐layer graphene using chemical vapor deposition. Preferred growth of single‐crystal CH3NH3PbBr3 platelets on graphene surfaces is achieved, which is accompanied by significant photoluminescence quenching. Raman spectra reveal that perovskite platelets cause p‐type doping in the graphene layer. A significant Fermi level decrease of 272 meV in graphene is estimated, which corresponds to a high doping density of 7.5 × 1012 cm−2. Surface potentials measured by Kelvin probe force microscopy indicate a negatively charged perovskite surface under illumination, which is consistent with the upward band bending deduced from conducting atomic force microscopy measurements. Moreover, a field‐effect phototransistor is fabricated using the perovskite/graphene heterostructure channel, and the increased Dirac voltage under illumination confirms an enhanced p‐type character in graphene. These findings enrich the understanding of strong interface coupling in such mixed‐dimensional vdW heterostructures and pave the way toward novel perovskite‐based optoelectronic devices.

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Section: Interface Interactionssupporting

confidence: 70%

Section: Interface Interactionsmentioning

confidence: 65%

Single‐Crystal Hybrid Perovskite Platelets on Graphene: A Mixed‐Dimensional Van Der Waals Heterostructure with Strong Interface Coupling

Liu

You

Faraji

et al. 2020

Adv Funct Materials

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show abstract

“…[54,66,67] This dependency indicates that narrower patterns and higher doping are required to induce plasmon resonances at higher frequencies. In particular, the doping level in Figure 3e was controlled by capacitor-like electrostatic gating, which is preferable over the use of ionic gels, [66,68,69] photodoping, [70] or chemical doping [67,71] for highspeed modulation and functional integration.…”

Section: Free Space Light Modulationmentioning

confidence: 99%

Functional Mid‐Infrared Polaritonics in van der Waals Crystals

Kim

Menabde

Brar

et al. 2019

Advanced Optical Materials

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Despite high scientific and technological potential, nanophotonics research in the mid‐infrared regime remains relatively less explored compared to other frequency bands, largely because the mid‐infrared requires a totally different set of optical materials. Polaritons in layered 2D materials, or van der Waals (vdW) crystals, provide a new set of building blocks for mid‐infrared nanophotonics. Herein, the recently reported polaritonic properties of various vdW crystals are summarized in the context of their mid‐infrared applications. Both polaritons in vdW crystals with naturally anisotropic atomic structures as well as tunable plasmon polaritons in vdW semimetals are discussed. The extreme field confinement of 2D polaritons (confinement factors ≈100) enhances both their radiative heat transfer as well as the optical coupling to the vibrational modes of molecules, allowing for highly sensitive chemical detection. Their tunable properties, meanwhile, enable dynamic modulation of mid‐infrared light to realize dynamic phase shifters, mid‐infrared modulators, and spectrally tunable thermal emitters. By vertically stacking vdW crystals, it is possible to create a large variety of new effective materials with substantially different polaritonic properties compared to their building blocks.

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“…Noble metals, such as Au [11] Pt [12] Pd [13] Ru [14] etc., exhibit a much higher catalytic activity toward ORR/OER, but their expensive prices prohibit their applications. Carbon-based material often shows high catalytic activity toward ORR but they will react with the discharge product Li 2 O 2 to form Li 2 CO 3 [15] which is more difficult to decompose, leading to poor cyclability.…”

Section: Porous Urchin-like Co 3 O 4 Microspheres As An Efficient Bifmentioning

confidence: 99%

Porous Urchin‐like Co₃O₄ Microspheres as an Efficient Bifunctional Catalyst for Nonaqueous and Solid‐State Li−O₂ Batteries

et al. 2018

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Porous urchin‐like Co3O4 microspheres consisting of nanowires (NWs) have been obtained through a hydrothermal synthesis. This unique porous structure not only increases the number of active sites for reactions, but also provides more storage space for the discharge product Li2O2. When used as a cathode catalyst for Li−O2 batteries with nonaqueous electrolyte, the cell exhibits a much higher initial specific discharge capacity of 9013.1 mA h g−1, better rate capability and cycling stability. Furthermore, rechargeable solid‐state Li−O2 cells were prepared with a hybrid solid electrolyte (HSE) membrane composed of inorganic Li7La3Zr2O12 particles and PVDF‐HFP both as electrolyte and separator, and Co3O4‐NWs microspheres used as a catalyst for the air electrode. The solid‐state Li−O2 cell with this catalyst shows a high initial specific capacity of 8000 mA h g−1, close to that of the cell with liquid electrolyte. It also shows a better stability with low polarization.

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Li–S Batteries: All‐Solid‐State Printed Bipolar Li–S Batteries (Adv. Energy Mater. 40/2019)

Cited by 96 publications

References 0 publications

Single‐Crystal Hybrid Perovskite Platelets on Graphene: A Mixed‐Dimensional Van Der Waals Heterostructure with Strong Interface Coupling

Single‐Crystal Hybrid Perovskite Platelets on Graphene: A Mixed‐Dimensional Van Der Waals Heterostructure with Strong Interface Coupling

Functional Mid‐Infrared Polaritonics in van der Waals Crystals

Porous Urchin‐like Co₃O₄ Microspheres as an Efficient Bifunctional Catalyst for Nonaqueous and Solid‐State Li−O₂ Batteries

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Li–S Batteries: All‐Solid‐State Printed Bipolar Li–S Batteries (Adv. Energy Mater. 40/2019)

Cited by 96 publications

References 0 publications

Single‐Crystal Hybrid Perovskite Platelets on Graphene: A Mixed‐Dimensional Van Der Waals Heterostructure with Strong Interface Coupling

Single‐Crystal Hybrid Perovskite Platelets on Graphene: A Mixed‐Dimensional Van Der Waals Heterostructure with Strong Interface Coupling

Functional Mid‐Infrared Polaritonics in van der Waals Crystals

Porous Urchin‐like Co3O4 Microspheres as an Efficient Bifunctional Catalyst for Nonaqueous and Solid‐State Li−O2 Batteries

Contact Info

Product

Resources

About

Porous Urchin‐like Co₃O₄ Microspheres as an Efficient Bifunctional Catalyst for Nonaqueous and Solid‐State Li−O₂ Batteries