Thermoelectricity in the context of renewable energy sources: joining forces instead of competing

Andrei, Virgil; Bethke, Kevin; Rademann, Klaus

doi:10.1039/c6ee00247a

Cited by 49 publications

(31 citation statements)

References 48 publications

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“…4, after the time elapse of 6-8 hours (i.e., t E 0.1Át), the NP distribution in the bulk is much closer to that in the initial state than in the Soret equilibrium one. This makes us speculate that the experimentally determined stationary state Seebeck S st e is not equal to the Soret equilibrium Seebeck S Eq e as described in eqn (5). Similar simulation results were obtained by Putnam et al 36 for colloidal solutions (not ferrofluids) with a comparable Soret coefficient.…”

Section: Stationary Seebeck Coefficientsupporting

confidence: 72%

“…Thermoelectric effects exist in many solid and liquid materials, but the most efficient thermoelectric converters (generator or coolers) today are all based on low-gap semiconductors. [1][2][3][4][5] Complementary to the solid thermoelectric technologies, liquid-based thermoelectrochemical cells, or simply, thermocells are attracting increasing attention as a cheap and scalable alternative. [6][7][8][9] Thermocells produce an electrical current through redox reactions when two electrodes are maintained at different temperatures.…”

Section: Introductionmentioning

confidence: 99%

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Can charged colloidal particles increase the thermoelectric energy conversion efficiency?

Salez

Huang

Rietjens

et al. 2017

Phys. Chem. Chem. Phys.

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a Currently, liquid thermocells are receiving increasing attention as an inexpensive alternative to conventional solid-state thermoelectrics for low-grade waste heat recovery applications. Here we present a novel path to increase the Seebeck coefficient of liquid thermoelectric materials using charged colloidal suspensions; namely, ionically stabilized magnetic nanoparticles (ferrofluids) dispersed in aqueous potassium ferro-/ferricyanide electrolytes. The dependency of thermoelectric potential on experimental parameters such as nanoparticle concentration and types of solute ions (lithium citrate and tetrabutylammonium citrate) is examined to reveal the relative contributions from the thermogalvanic potential of redox couples and the entropy of transfer of nanoparticles and ions. The results show that under specific ionic conditions, the inclusion of magnetic nanoparticles can lead to an enhancement of the ferrofluid's initial Seebeck coefficient by 15% (at a nanoparticle volume fraction of B1%). Based on these observations, some practical directions are given on which ionic and colloidal parameters to adjust for improving the Seebeck coefficients of liquid thermoelectric materials.

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Section: Stationary Seebeck Coefficientsupporting

confidence: 72%

Section: Introductionmentioning

confidence: 99%

Can charged colloidal particles increase the thermoelectric energy conversion efficiency?

Salez

Huang

Rietjens

et al. 2017

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

show abstract

“…As society's energy demands increase, the production and storage of sustainable energy becomes a critical issue. [1][2][3][4] While photovoltaic (PV) modules may cover this demand on their own, large scale applications still require alternatives to batteries and supercapacitors for a more effective energy storage and transport. [1,2,[5][6][7][8][9] From this perspective, solar fuels (e.g.…”

Section: Introductionmentioning

confidence: 99%

Scalable Triple Cation Mixed Halide Perovskite–BiVO₄ Tandems for Bias‐Free Water Splitting

Andrei

Hoye

Crespo‐Quesada

et al. 2018

Advanced Energy Materials

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154

210

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Strong interest exists in the development of organic-inorganic lead halide perovskite photovoltaics and of photoelectrochemical (PEC) tandem absorber systems for solar fuel production. However, their scalability and durability have long been limiting factors. In this work, we reveal how both fields can be seamlessly merged together, to obtain scalable, bias-free solar water splitting tandem devices. For this purpose, state-of-the-art cesium formamidinium methylammonium (CsFAMA) triple cation mixed halide perovskite photovoltaic cells with a nickel oxide (NiO x) hole transport layer are employed to produce Field's metal-epoxy encapsulated photocathodes. Their stability (up to 7 h), photocurrent density (-12.1±0.3 mA cm −2 at 0 V vs. RHE) and reproducibility enables a matching combination with robust BiVO 4 photoanodes, resulting in 0.25 cm 2 PEC tandems with an excellent stability of up to 20 h and a bias-free solar-to-hydrogen efficiency of 0.35±0.14%. The high reliability of the fabrication procedures allows scaling of the devices up to 10 cm 2 , with a slight decrease in bias-free photocurrent density from 0.39±0.15 mA cm −2 to 0.23±0.10 mA cm −2 due to an increasing series resistance. To characterise these devices, a versatile 3D-printed PEC cell was also developed. The modular PEC cell represents an affordable alternative to existing designs and can be easily adjusted for a broad range of samples. Overall, these findings shed further light on the factors required to bring both perovskite photovoltaics and photoelectrocatalysis into large-scale applications, revealing some key aspects for device fabrication, operation and implementation.

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“…For an optimal thermoelectric power conversion, a high Seebeck coefficient is required, as well as a high electrical conductivity and a low thermal conductivity of the material . These properties are also crucial for combinations of different renewable energy sources, which will become more important for the future of energy and environmental science, as it has been recently pointed out . To enable such hybrid devices, the combination of active thermoelectric materials and inactive supporting material has to be optimized.…”

Section: Applications For Functionalized Cellulosementioning

confidence: 99%

“…Similarly, other technologies which harness mechanical stress or friction (i.e., triboelectricity, piezoelectricity) can be also employed directly for sensing, or as power supplies for low power sensors, benefitting again from the excellent properties of functionalized cellulose. For example, a combination of nitrated and methylated cellulose nanofibrils has been used for highly efficient triboelectric nanogenerators.…”

Section: Applications For Functionalized Cellulosementioning

confidence: 99%

Functionalized Cellulose for Water Purification, Antimicrobial Applications, and Sensors

Bethke

Palantöken

Andrei

et al. 2018

Adv Funct Materials

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217

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As the most abundant natural polymer, cellulose presents a unique advantage for large-scale applications. To fully unlock its potential, the introduction of desired functional groups onto the cellulose backbone is required, which can be realized by either chemical bonding or physical surface interactions. This review gives an overview of the chemistry behind the state-of-the-art functionalization methods (e.g., oxidation, esterification, grafting) for cellulose in its various forms, from nanocrystals to bacterial cellulose. The existing and foreseeable applications of the obtained products are presented in detail, spanning from water purification and antibacterial action, to sensing, energy harvesting, and catalysis. A special emphasis is put on the interactions of functionalized cellulose with heavy metals, focusing on copper as a prime example. For the latter, its toxicity can either have a harmful influence on aquatic life, or it can be conveniently employed for microbial disinfection. The reader is further introduced to recent sensing technologies based on functionalized cellulose, which are becoming crucial for the near future especially with the emergence of the internet of things. By revealing the potential of water filters and conductive clothing for mass implementation, the near future of cellulose-based technologies is also discussed.not suitable for drinking water treatment in rural areas or not applicable on a large scale. Other methods involving materials which have high adsorption capacities for pollutants, for example activated charcoal have been explored. [27,28] Nevertheless, there are no universal adsorbents for all pollutants, meaning that superior alternatives are still required. In recent years, biodegradable adsorbents such as cellulose and chitosan have attracted much attention for the removal of heavy metals.In particular cellulose has a number of advantages, which include high abundance, low cost, easy access, nontoxicity and biodegradability. It is particularly suited for the removal of low concentrations of heavy metals which occur in contaminated ground or tap water. [26] Beyond the aspects of copper removal from water, in this review we indicate how the metal's increased toxicity for microbial life can present an advantage for medical applications. Moreover, we also take a closer look at further applications of functionalized cellulose, including catalysis and sensing, which can make a great impact regarding energy conversion and management. The inclusion of conductive cellulose sensors within the internet of things global network is of particular interest, since an accurate weather forecast can provide swift adjustments in the usage of the often intermittent renewable energy sources. In order to understand what confers functionalized cellulose its versatility for broad applications, we first exemplify the functionalization techniques on a molecular basis.

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Thermoelectricity in the context of renewable energy sources: joining forces instead of competing

Abstract: 3-in-1: combining thermoelectrics, photovoltaics and water splitting catalysts in one device.

Cited by 49 publications

References 48 publications

Can charged colloidal particles increase the thermoelectric energy conversion efficiency?

Can charged colloidal particles increase the thermoelectric energy conversion efficiency?

Scalable Triple Cation Mixed Halide Perovskite–BiVO₄ Tandems for Bias‐Free Water Splitting

Functionalized Cellulose for Water Purification, Antimicrobial Applications, and Sensors

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Thermoelectricity in the context of renewable energy sources: joining forces instead of competing

Abstract: 3-in-1: combining thermoelectrics, photovoltaics and water splitting catalysts in one device.

Cited by 49 publications

References 48 publications

Can charged colloidal particles increase the thermoelectric energy conversion efficiency?

Can charged colloidal particles increase the thermoelectric energy conversion efficiency?

Scalable Triple Cation Mixed Halide Perovskite–BiVO4 Tandems for Bias‐Free Water Splitting

Functionalized Cellulose for Water Purification, Antimicrobial Applications, and Sensors

Contact Info

Product

Resources

About

Scalable Triple Cation Mixed Halide Perovskite–BiVO₄ Tandems for Bias‐Free Water Splitting