ITO nanoparticles break optical transparency/high-areal capacitance trade-off for advanced aqueous supercapacitors

Bellani, Sebastiano; Najafi, Leyla; Tullii, Gabriele; Ansaldo, Alberto; Oropesa‐Nuñez, Reinier; Prato, Mirko; Colombo, Massimo; Antognazza, Maria Rosa

doi:10.1039/c7ta09220b

Cited by 27 publications

(33 citation statements)

References 114 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…After folding at both these θ values, the device exhibited a 6% increase of the capacitance, without significant variation of the coulombic efficiency. The increase of capacitance can be tentatively attributed to a favorable mesoscopic rearrangement of the active materials in the folded electrodes …”

Section: Resultsmentioning

confidence: 96%

Scalable Production of Graphene Inks via Wet‐Jet Milling Exfoliation for Screen‐Printed Micro‐Supercapacitors

Bellani

Petroni

Castillo

et al. 2019

Adv Funct Materials

Self Cite

198

165

View full text Add to dashboard Cite

The miniaturization of energy storage units is pivotal for the development of next-generation portable electronic devices. Micro-supercapacitors (MSCs) hold great potential to work as on-chip micro-power sources and energy storage units complementing batteries and energy harvester systems. Scalable production of supercapacitor materials with costeffective and high-throughput processing methods is crucial for the widespread application of MSCs. Here, wet-jet milling exfoliation of graphite is reported to scale up the production of graphene as a supercapacitor material. The formulation of aqueous/alcohol-based graphene inks allows metal-free, flexible MSCs to be screen-printed. These MSCs exhibit areal capacitance (C areal ) values up to 1.324 mF cm −2 (5.296 mF cm −2 for a single electrode), corresponding to an outstanding volumetric capacitance (C vol ) of 0. 490 F cm −3 (1.961 F cm −3 for a single electrode). The screen-printed MSCs can operate up to a power density above 20 mW cm −2 at an energy density of 0.064 µWh cm −2 . The devices exhibit excellent cycling stability over chargedischarge cycling (10 000 cycles), bending cycling (100 cycles at a bending radius of 1 cm) and folding (up to angles of 180°). Moreover, ethylene vinyl acetate-encapsulated MSCs retain their electrochemical properties after a home-laundry cycle, providing waterproof and washable properties for prospective application in wearable electronics.

show abstract

Section: Resultsmentioning

confidence: 96%

Scalable Production of Graphene Inks via Wet‐Jet Milling Exfoliation for Screen‐Printed Micro‐Supercapacitors

Bellani

Petroni

Castillo

et al. 2019

Adv Funct Materials

Self Cite

198

165

View full text Add to dashboard Cite

show abstract

“…Interestingly, the capacitance of the device increased by 15 % and 26 % at θ of 90° and 180°, respectively. This behaviour can be ascribed to a favourable nano/mesoscopic reorganization of the morphology of the electrode films in the presence of a compressive strain occurring during folding …”

Section: Resultsmentioning

confidence: 99%

“…This behaviour can be ascribed to a favourable nano/mesoscopic reorganization of the morphology of the electrode films in the presence of a compressive strain occurring during folding. [145]…”

Section: Figure 5 Galvanostatic Charge/discharge Measurements Of Thementioning

confidence: 99%

Flexible Graphene/Carbon Nanotube Electrochemical Double‐Layer Capacitors with Ultrahigh Areal Performance

et al. 2019

Self Cite

View full text Add to dashboard Cite

The fabrication of electrochemical double‐layer capacitors (EDLCs) with high areal capacitance relies on the use of elevated mass loadings of highly porous active materials. Herein, we demonstrate a high‐throughput manufacturing of graphene/carbon nanotubes hybrid EDLCs. The wet‐jet milling (WJM) method is exploited to exfoliate the graphite into single‐few‐layer graphene flakes (WJM‐G) in industrial volumes (production rate ca. 0.5 kg/day). Commercial single‐/double‐walled carbon nanotubes (SDWCNTs) are mixed with graphene flakes in order to act as spacers between the flakes during their film formation. The WJM‐G/SDWCNTs films are obtained by one‐step vacuum filtration of the material dispersions, resulting in self‐standing, metal‐ and binder‐free flexible EDLC electrodes with high active material mass loadings up to around 30 mg cm−2. The corresponding symmetric WJM‐G/SDWCNTs EDLCs exhibit electrode energy densities of 539 μWh cm−2 at 1.3 mW cm−2 and operating power densities up to 532 mW cm−2 (outperforming most of the reported EDLC technologies). The EDCLs show excellent cycling stability and outstanding flexibility even in highly folded states (up to 180°).

show abstract

“…In line with such demands, many efforts have been focused on the preparation of TCO nanoparticles (NPs) and the development of their optimal solution approaches . Generally, high‐quality and monodisperse TCO NPs, including indium tin oxide (ITO), indium zinc oxide, aluminum‐doped zinc oxide, and gallium‐doped zinc oxide, have been synthesized using bulky/insulating organic ligands (e.g., oleic acid, oleylamine, tetrabutylammonium hydroxide) in organic media, and the resultant TCO NP–based electrodes have been successfully prepared through inkjet printing, roll‐to‐roll deposition, and spin coating of TCO NPs onto flat glass substrates . However, despite such progress, a few important factors need to be further considered for the preparation of next‐generation TCO NP–based electrodes.…”

Section: Introductionmentioning

confidence: 99%

Layer‐by‐Layer Assembled Oxide Nanoparticle Electrodes with High Transparency, Electrical Conductivity, and Electrochemical Activity by Reducing Organic Linker‐Induced Oxygen Vacancies

Cho

Song

Cheong

et al. 2020

Small

View full text Add to dashboard Cite

Solution‐processable transparent conducting oxide (TCO) nanoparticle (NP)–based electrodes are limited by their low electrical conductivity, which originates from the low level of oxygen vacancies within NPs and the contact resistance between neighboring NPs. Additionally, these electrodes suffer from the troublesome trade‐off between electrical conductivity and optical transmittance and the restricted shape of substrates (i.e., only flat substrates). An oxygen‐vacancy‐controlled indium tin oxide (ITO) NP‐based electrode is introduced using carbon‐free molecular linkers with strong chemically reducing properties. Specifically, ITO NPs are layer‐by‐layer assembled with extremely small hydrazine monohydrate linkers composed of two amine groups, followed by thermal annealing. This approach markedly improves the electrical conductivity of ITO NP‐based electrodes by significantly increasing the level of oxygen vacancies and decreasing the interparticle distance (i.e., contact resistance) without sacrificing optical transmittance. The prepared electrodes surpass the optical/electrical performance of TCO NP‐based electrodes reported to date. Additionally, the nanostructured ITO NP films can be applied to more complex geometric substrates beyond flat substrates, and furthermore exhibit a prominent electrochemical activity. This approach can provide an important basis for developing a wide range of highly functional transparent conducting electrodes.

show abstract

ITO nanoparticles break optical transparency/high-areal capacitance trade-off for advanced aqueous supercapacitors

Abstract: Indium tin oxide nanoparticles break optical transparency/high-areal capacitance trade-off for advanced aqueous supercapacitors.

Cited by 27 publications

References 114 publications

Scalable Production of Graphene Inks via Wet‐Jet Milling Exfoliation for Screen‐Printed Micro‐Supercapacitors

Scalable Production of Graphene Inks via Wet‐Jet Milling Exfoliation for Screen‐Printed Micro‐Supercapacitors

Flexible Graphene/Carbon Nanotube Electrochemical Double‐Layer Capacitors with Ultrahigh Areal Performance

Layer‐by‐Layer Assembled Oxide Nanoparticle Electrodes with High Transparency, Electrical Conductivity, and Electrochemical Activity by Reducing Organic Linker‐Induced Oxygen Vacancies

Contact Info

Product

Resources

About