Graphene oxide as a versatile platform for emerging hydrovoltaic technology

Jiao, Shipu; Li, Yang; Li, Jiaxuan; Abrha, Halayit; Liu, Miao; Cui, Jinran; Wang, Jiao; Dai, Yexin; Liu, Xianhua

doi:10.1039/d2ta04830b

Cited by 13 publications

(4 citation statements)

References 69 publications

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“…However, in earlier reports of carbon nanomaterials, researchers typically used carbon black particles or graphene films with dense stacking layers. For example, Zhou et al fabricated porous carbon black particle films by the flame synthesis method and reported the electrical output of 0.89 V open-circuit voltage and hundreds of nanoamps short-circuit current under humidity conditions .…”

Section: Introductionmentioning

confidence: 99%

Hygroelectric Generator Based on Antisymmetric Modification of Graphene Spheres with Ionic Hydrogels

Jiang

et al. 2023

ACS Appl. Nano Mater.

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The moisture-enabled electric generators (MEGs) have attracted wide attention in recent years due to their advantages such as green energy, small size, and simple fabrication process. However, carbon black particles with poor electrical conductivity are often used as the power generation layer in current reports, and their functional group concentration gradient is small, which limits the output power density and working time. In this paper, a high-performance MEG has been designed and fabricated by asymmetric deposition of ionic hydrogels on the surface of graphene spheres. Compared with carbon black particles, graphene spheres have better electrical conductivity. Compared with lamellar graphene, graphene spheres provide larger specific surface area and more abundant nanochannels. Hygroscopic ionic hydrogel captures moisture to provide the water environment (1.32 mg cm −2 h −1 water can be captured at 98% RH). On the other hand, ions can also be directionally transported under the ion concentration gradient to improve the device output performance. The device finally obtains a 0.34 V open-circuit voltage and a 1 μA short-circuit current under 98% RH, and the electrical output has no obvious attenuation even after 5 h of operation. The designed device can not only power the small bulb but also be used as a self-powered humidity sensor to monitor the indoor humidity changes in real time.

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Section: Introductionmentioning

confidence: 99%

Hygroelectric Generator Based on Antisymmetric Modification of Graphene Spheres with Ionic Hydrogels

Jiang

et al. 2023

ACS Appl. Nano Mater.

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“…To use GO as a low-electrical-conductance humidity sensor, we should use the capacitance change rather than the resistance change to detect humidity changes. However, a capacitive-signal-based humidity sensor has a complex structure, unlike a resistive-signal-based humidity sensor, which has a single conductive layer as the sensing layer. ,, Furthermore, since the number of functional groups in rGO is tailorable, the performance of an rGO sensor can be adjusted by varying the number of functional groups, which would influence the interaction of the sensor with moisture in the air. , Since SF has low electrical conductance, the advantage of rGO/SF-based sensors over GO/SF-based sensors can be attributed to the rGO/SF composite’s significantly improved electrical conductance owing to rGO.…”

Section: Introductionmentioning

confidence: 99%

“…41,45,46 Furthermore, since the number of functional groups in rGO is tailorable, the performance of an rGO sensor can be adjusted by varying the number of functional groups, which would influence the interaction of the sensor with moisture in the air. 47,48 Since SF has low electrical conductance, the advantage of rGO/SF-based sensors over GO/SF-based sensors can be attributed to the rGO/SF composite's significantly improved electrical conductance owing to rGO.…”

Section: Introductionmentioning

confidence: 99%

Robust, Ultrathin, and Highly Sensitive Reduced Graphene Oxide/Silk Fibroin Wearable Sensors Responded to Temperature and Humidity for Physiological Detection

Cho

Lee

et al. 2023

Biomacromolecules

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Skin temperature and skin humidity are used for monitoring physiological processes, such as respiration. Despite advances in wearable temperature and humidity sensors, the fabrication of a durable and sensitive sensor for practical uses continues to pose a challenge. Here, we developed a durable, sensitive, and wearable temperature and humidity sensor. A reduced graphene oxide (rGO)/silk fibroin (SF) sensor was fabricated by employing a layer-by-layer technique and thermal reduction treatment. Compared with rGO, the elastic bending modulus of rGO/SF could be increased by up to 232%. Furthermore, an evaluation of the performance of an rGO/SF sensor showed that it had outstanding robustness: it could withstand repeatedly applied temperature and humidity loads and repeated bending. The developed rGO/SF sensor is promising for practical applications in healthcare and biomedical monitoring.

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“…Three-dimensional analysis of graphene and graphene oxides and their synthesis were studied by Singh [4], while Jahan [5] explored the sorption behaviour of graphene oxide and reduced graphene oxide towards methylene blue and found that reduced graphene oxide has a higher sorption capacity than graphene oxide. Hydrovolcanic technology was used by Jiao et al [6] to study the versatile nature of graphene oxides. Aluminium and its compounds comprise about 8% of the Earth's surface; aluminium occurs naturally in silicates, cryolite, and bauxite rock.…”

Section: Introductionmentioning

confidence: 99%

An influence of temperature jump and Navier’s slip-on hybrid nano fluid flow over a permeable stretching/shrinking sheet with heat transfer and inclined MHD

Sachhin,

Mahabaleshwar,

Huang

et al. 2023

Nanotechnology

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This research article, explores the influence of an inclined magnetic field on the fluid flow over a permeable stretching/shrinking surface with heat transfer. The study use water as a conventional base fluid, with graphene oxide (GO) and Aluminum oxide (Al2O3) nanoparticles submerged to create a nanofluid, the system of governing nonlinear partial differential equations converted into ordinary differential equations via suitable similarity conversions. This allow for the unique solution for stretching sheet/shrinking sheets to be obtained, along with the corresponding temperature solution in terms of the hypergeometric function, several parameters are included in the investigation and their contribution is graphically explained to examine physical characteristics such as radiation, inclined magnetic field, solution domain, volume fraction parameter, and temperature jump. Increasing the volume fraction and thermal radiation increases the thermal boundary layer, increasing the magnetic field parameter and inverse Darcy number increases the temperature and decays the velocity profile. The present work has many useful applications in engineering, biological and physical sciences, as well as in cleaning engine lubricants and thrust-bearing technologies.

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Graphene oxide as a versatile platform for emerging hydrovoltaic technology

Abstract: Abstract：Hydrovoltaic technology can harvest sustainable energy and clean water directly from various environments, providing a novel way to alleviate global environmental problems and energy crisis. A wide variety of hydrovoltaic...

Cited by 13 publications

References 69 publications

Hygroelectric Generator Based on Antisymmetric Modification of Graphene Spheres with Ionic Hydrogels

Hygroelectric Generator Based on Antisymmetric Modification of Graphene Spheres with Ionic Hydrogels

Robust, Ultrathin, and Highly Sensitive Reduced Graphene Oxide/Silk Fibroin Wearable Sensors Responded to Temperature and Humidity for Physiological Detection

An influence of temperature jump and Navier’s slip-on hybrid nano fluid flow over a permeable stretching/shrinking sheet with heat transfer and inclined MHD

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