Graphene-carbon nanotube papers for energy conversion and storage under sunlight and heat

Mu, Jiuke; Hou, Chengyi; Wang, Hongzhi; Li, Yaogang; Zhang, Qinghong

doi:10.1016/j.carbon.2015.08.027

Cited by 23 publications

(8 citation statements)

References 38 publications

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“…To date, macroscopic assembled, free‐standing, and chemically stable graphene papers (GPs) have been demonstrated as promising materials in many emerging fields. Noteworthy examples include ultrahigh‐power‐density supercapacitors, multistimuli responsive (light, temperature, and moisture) actuators, programmable instant self‐folding walking devices, thermal management for high‐power electronics and portable devices, electronic skin for sensing human touch, energy conversion and storage devices, electrothermal application and deicing, and planar lighting . The superior chemical/mechanic stability, high thermal conductivity, and low electrical resistance of graphene also make it a suitable material for PTM, and yet has been rarely reported.…”

Section: Introductionmentioning

confidence: 99%

Ultrathin, Washable, and Large‐Area Graphene Papers for Personal Thermal Management

Guo

Dun

et al. 2017

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117

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Freestanding, flexible/foldable, and wearable bifuctional ultrathin graphene paper for heating and cooling is fabricated as an active material in personal thermal management (PTM). The promising electrical conductivity grants the superior Joule heating for extra warmth of 42 °C using a low supply voltage around 3.2 V. Besides, based on its high out-of-plane thermal conductivity, the graphene paper provides passive cooling via thermal transmission from the human body to the environment within 7 s. The cooling effect of graphene paper is superior compared with that of the normal cotton fiber, and this advantage will become more prominent with the increased thickness difference. The present bifunctional graphene paper possesses high durability against bending cycles over 500 times and wash time over 1500 min, suggesting its great potential in wearable PTM.

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Section: Introductionmentioning

confidence: 99%

Ultrathin, Washable, and Large‐Area Graphene Papers for Personal Thermal Management

Guo

Dun

et al. 2017

Small

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192

117

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“…Despite the immense solar thermal energy provided by the sun, the negligible temperature gradient and susceptibility of the temperature to fluctuation in local environmental factors 18,19 (e.g., wind) impede efficient solar thermoelectric transformation. 20 To handle such challenges, numerous light and thermal management strategies, e.g., optical concentration, flat-plate design, evacuated tube, and so on, 21−24 have been proposed to fabricate high-performance solar harvesters by boosting and sustaining high localized temperatures. However, the sophisticated, tedious preparation methods and high fabrication cost restrict practical, large-scale implementation.…”

Section: ■ Introductionmentioning

confidence: 99%

Spray-On Carbon Black Nanopowder/Polyvinylidene Fluoride-Based Solar–Thermal–Electric Generators to Power Electronic Devices

Huang

Wang

et al. 2022

ACS Appl. Nano Mater.

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Solar-driven generators are an emerging power generation technology due to the use of sunlight as a green and renewable energy source. However, the complex, tedious, and costly fabrication processes impede large-scale practical application. In this work, we demonstrate a unique solar-thermal generator for efficient solar–thermal–electric conversion to enable real-time, outdoor charging applications using green solar energy. Our solar absorber comprises a cost-effective layer of nanoscale carbon black powders/polyvinylidene fluoride (CB/PVDF) mixture that can be easily sprayed onto the hot end of a commercial thermoelectric device for large-scale fabrication of the solar generator. The solar–thermal conversion of the CB/PVDF solar absorber can be enhanced by designing hierarchical, micro/nano-sized porous structures for better light penetration and utilization and using an insulating sponge cover to promote heat localization and avert potential environmental fluctuations. These design criteria are necessary to achieve a stable and high electrical output (3.3 mW under 1 sun), even under diverse operating conditions such as different ambient temperatures (0–25 °C) and various sunlight intensities (1–7 sun). As a proof-of-concept application, our generators can be connected in series/parallel and further integrated with a voltage conversion module to enable the efficient and instantaneous charging of modern electronic devices using green solar energy, notably at a charging rate of about 5% per hour. Our unique design is anticipated to expedite the development of an efficient, portable solar generator with the aim to decentralize green power generation, which is beneficial in remote places that do not have access to the electrical grid.

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“…Over the past few years, nanowires [1][2][3][4][5] or nanotubes 6,7 as the building blocks for one dimensional (1D) materials have attracted enormous research interests for high performance devices 5,8 due to their notable properties of high surface area to volume ratio. The main challenge of nanoscale devices to daily applications is the formation of Schottky contacts between metallic and semiconducting interfaces causing a loss in electron transport 9,10 .…”

Section: Introductionmentioning

confidence: 99%

“…Over the past years, nanowires − or nanotubes , have attracted enormous research interest for high performance devices , and great advances have been made. Well controlled synthesis protocols allow fabricating structures with high aspect ratios and small diameters, leading to a large surface to volume ratio that can be important, for example, in sensor applications. , The nanowire (NW) geometry provides the interesting possibility of fabricating axial heterostructures that can be easily accessed electrically by contacting the NW edges.…”

Section: Introductionmentioning

confidence: 99%

In-Situ Transmission Electron Microscopy Imaging of Aluminum Diffusion in Germanium Nanowires for the Fabrication of Sub-10 nm Ge Quantum Disks

Luong

Robin

Pauc

et al. 2020

ACS Appl. Nano Mater.

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Aluminum-germanium nanowires (NWs) thermal activated solid state reaction is a promising system as very sharp and well defined one dimensional contacts can be created between a metal and a semiconductor, that can become a quantum dot if the size becomes sufficiently small. In the search for high performance devices without variability, it is of high interest to allow deterministic fabrication of nanowire quantum dots, avoiding sample variability and obtaining atomic scale precision on the fabricated dot size. In this paper, we present a reliable fabrication process to produce sub-10 nm Ge quantum dots (QDs), using a combination of ex-situ thermal annealing via rapid thermal annealing (RTA) and in-situ Joule heating technique in a transmission electron microscope (TEM). First we present in-situ direct joule heating experiments showing how the heating electrode could be damaged due to the formation of Al crystals and voids at the vicinity of the metal/NW contact, likely related with electro-migration phenomena. We show that the contact quality can be preserved by including an additional ex-situ RTA step prior to the in-situ heating. The in-situ observations also show in real-time how the exchange reaction initiates simultaneously from several locations underneath the Al contact pad, and the Al crystal grows gradually inside the initial Ge NW with the growth interface along a Ge(111) lattice plane. Once the reaction front moves out from underneath the contact metal, two factors jeopardize an atomically accurate control of the Al/Ge reaction interface. We observed a local acceleration of the reaction interface due to the electron beam irradiation in the transmission electron microscope as well as the appearance of large jumps of the interface in unpassivated Ge wires while a smooth advancement of the reaction interface was observed in wires with an Al2O3 protecting shell on the surface. Carefully controlling all aspects of the exchange reaction, we demonstrate a fabrication process combining ex-situ and in-situ heating techniques to precisely control and produce axial Al/Ge/Al NW heterostructures with an ultra-short Ge segment down to 8 nanometers. Practically, the scaling down of Ge segment length is only limited by the microscope resolution.

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Graphene-carbon nanotube papers for energy conversion and storage under sunlight and heat

Cited by 23 publications

References 38 publications

Ultrathin, Washable, and Large‐Area Graphene Papers for Personal Thermal Management

Ultrathin, Washable, and Large‐Area Graphene Papers for Personal Thermal Management

Spray-On Carbon Black Nanopowder/Polyvinylidene Fluoride-Based Solar–Thermal–Electric Generators to Power Electronic Devices

In-Situ Transmission Electron Microscopy Imaging of Aluminum Diffusion in Germanium Nanowires for the Fabrication of Sub-10 nm Ge Quantum Disks

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