Flexible carbon dots composite paper for electricity generation from water vapor absorption

Li, Qijun; Zhou, Ming; Yang, Qingfeng; Yang, Mingyang; Wu, Qian; Zhang, Zhixun; Yu, Jianwen

doi:10.1039/c8ta02505c

Cited by 55 publications

(28 citation statements)

References 27 publications

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“…The close relationship between humidity and charge transfer resistance reflects affinity of water molecules onto the electrode surface, particularly docking of the adsorbed water molecules upon the polar residues (primarily OH and COOH units) on the C-dots’ surface [ 46 , 47 ]. As such, higher concentrations of physically adsorbed water molecules upon the C-dot-IDE surface would give rise to smaller Rct due to the conductive nature of water molecules [ 48 ].…”

Section: Resultsmentioning

confidence: 99%

Sniffing Bacteria with a Carbon-Dot Artificial Nose

et al. 2021

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Highlights Novel artificial nose based upon electrode-deposited carbon dots (C-dots). Significant selectivity and sensitivity determined by “polarity matching” between the C-dots and gas molecules. The C-dot artificial nose facilitates, for the first time, real-time, continuous monitoring of bacterial proliferation and discrimination among bacterial species, both between Gram-positive and Gram-negative bacteria and between specific strains. Machine learning algorithm furnishes excellent predictability both in the case of individual gases and for complex gas mixtures. Abstract Continuous, real-time monitoring and identification of bacteria through detection of microbially emitted volatile molecules are highly sought albeit elusive goals. We introduce an artificial nose for sensing and distinguishing vapor molecules, based upon recording the capacitance of interdigitated electrodes (IDEs) coated with carbon dots (C-dots) exhibiting different polarities. Exposure of the C-dot-IDEs to volatile molecules induced rapid capacitance changes that were intimately dependent upon the polarities of both gas molecules and the electrode-deposited C-dots. We deciphered the mechanism of capacitance transformations, specifically substitution of electrode-adsorbed water by gas molecules, with concomitant changes in capacitance related to both the polarity and dielectric constants of the vapor molecules tested. The C-dot-IDE gas sensor exhibited excellent selectivity, aided by application of machine learning algorithms. The capacitive C-dot-IDE sensor was employed to continuously monitor microbial proliferation, discriminating among bacteria through detection of distinctive “volatile compound fingerprint” for each bacterial species. The C-dot-IDE platform is robust, reusable, readily assembled from inexpensive building blocks and constitutes a versatile and powerful vehicle for gas sensing in general, bacterial monitoring in particular.

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Section: Resultsmentioning

confidence: 99%

Sniffing Bacteria with a Carbon-Dot Artificial Nose

et al. 2021

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“…It has been found that commercial printing paper, pure cellulose films, and filler-free filter paper have abundant polarized oxygen groups that can release free protons allowing them to be used to generate electricity in moist conditions. [95,164] These MEGs are based on the ionic diffusion gradient mechanism, but the gradient in ion concentration and the electric field readily collapse, yielding transient voltage pulses when exposed to moisture (Figure 12). It is relevant that paper incorporating power generation units can also be assembled into various shapes and structures such as books, origami, and Chinese traditional paper fans (Figure 12a), with capabilities of harvesting energy from ambient moisture.…”

Section: Biofiber-based Megs For Transient Electricity Outputmentioning

confidence: 99%

Moisture‐Enabled Electricity Generation: From Physics and Materials to Self‐Powered Applications

et al. 2020

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Ongoing efforts to develop this energy have led to the creation of a variety of novel technologies based on photovoltaic, [12,13] piezoelectric, [14,15] triboelectric, [16,17] and thermoelectric principles. [18,19] Devices based on these technologies are readily incorporated into self-powered, battery-free electronic systems. This also acts to eliminate the harm to the environment caused by the use of conventional batteries. [20,21] As recyclable resource, water is not only indispensable to life but also constitutes the largest energy carrier on Earth (Figure 1a). As 71% of the Earth's surface is covered by water and 35% of solar energy incident on the Earth is absorbed by water, petawatts of energy are received in this way. [22] As the water resource is clean and sustainable, the energy contained in even a small fraction of the water on Earth can meet the current global energy demand if this energy can be efficiently harvested. Terrestrial water exists in vapor and liquid form including moisture, rain, clouds, lakes, rivers, and oceans. It also forms the basis for biological systems. Even though there is a long history of electricity generation from running water, most technologies only utilize the gravitational and kinetic energy in liquid water. [23] Such systems are inherently incompatible with the development of self-powered devices. The development of nanomaterials has enabled technology for the extraction of electrical energy from moisture, leading to The exploration of the utilization of sustainable, green energy represents one way in which it is possible to ameliorate the growing threat of the global environmental issues and the crisis in energy. Moisture, which is ubiquitous on Earth, contains a vast reservoir of low-grade energy in the form of gaseous water molecules and water droplets. It has now been found that a number of functionalized materials can generate electricity directly from their interaction with moisture. This suggests that electrical energy can be harvested from atmospheric moisture and enables the creation of a new range of self-powered devices. Herein, the basic mechanisms of moisture-induced electricity generation are discussed, the recent advances in materials (including carbon nanoparticles, graphene materials, metal oxide nanomaterials, biofibers, and polymers) for harvesting electrical energy from moisture are summarized, and some strategies for improving energy conversion efficiency and output power in these devices are provided. The potential applications of moisture electrical generators in self-powered electronics, healthcare, security, information storage, artificial intelligence, and Internet-of-things are also discussed. Some remaining challenges are also considered, together with a number of suggestions for potential new developments of this emerging technology.

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“…For instance, graphene, various carbons, polymers, and biomolecules have all been demonstrated as potential electrokinetic converting materials for nano-hydroelectrics. 13,18,19 This ubiquity in materials selection provides a greater freedom for designing nano-hydroelectrics to target specific design requirements. Moreover, recent developments have made it possible to harvest energy from the vapor state as well, greatly expanding the versatility of nano-hydroelectrics.…”

Section: Introductionmentioning

confidence: 99%

Towards Watt-scale hydroelectric energy harvesting by Ti₃C₂T_x-based transpiration-driven electrokinetic power generators

Bae

Kim

et al. 2022

Energy Environ. Sci.

101

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Flexible carbon dots composite paper for electricity generation from water vapor absorption

Abstract: A scalable fabrication method for flexible moisture-electric energy transformation devices by dispersing or printing carbon dots on paper is reported.

Cited by 55 publications

References 27 publications

Sniffing Bacteria with a Carbon-Dot Artificial Nose

Sniffing Bacteria with a Carbon-Dot Artificial Nose

Moisture‐Enabled Electricity Generation: From Physics and Materials to Self‐Powered Applications

Towards Watt-scale hydroelectric energy harvesting by Ti₃C₂T_x-based transpiration-driven electrokinetic power generators

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Flexible carbon dots composite paper for electricity generation from water vapor absorption

Abstract: A scalable fabrication method for flexible moisture-electric energy transformation devices by dispersing or printing carbon dots on paper is reported.

Cited by 55 publications

References 27 publications

Sniffing Bacteria with a Carbon-Dot Artificial Nose

Sniffing Bacteria with a Carbon-Dot Artificial Nose

Moisture‐Enabled Electricity Generation: From Physics and Materials to Self‐Powered Applications

Towards Watt-scale hydroelectric energy harvesting by Ti3C2Tx-based transpiration-driven electrokinetic power generators

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Product

Resources

About

Towards Watt-scale hydroelectric energy harvesting by Ti₃C₂T_x-based transpiration-driven electrokinetic power generators