Floating hollow carbon spheres for improved solar evaporation

Celzard, Alain; Pasc, Andreea; Schaefer, Sébastien; Mandel, Karl; Ballweg, Thomas; Li, Sijin; Medjahdi, Ghouti; Nicolas, Vincent; Fierro, Vanessa

doi:10.1016/j.carbon.2019.01.101

Cited by 23 publications

(16 citation statements)

References 60 publications

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“…The corresponding Raman spectra demonstrated the same, but also that these materials are not graphitisable either, unless transition metals are added as graphitisation catalyst, which was not the case here. Typical Raman spectra of carbons based on tannin and tannin-sugar produced at 900°C can be found elsewhere (Celzard et al, 2019;Braghiroli et al, 2017), and prove that the present materials are definitely highly disordered, i.e. very poorly crystallised, carbons.…”

Section: Figuresupporting

confidence: 60%

“…Concerning the morphology, carbon spheres have a wide range of applications, depending on their diameter, pore texture and surface chemistry. For example, they can be used in batteries (Park et al, 2018) or supercapacitors (Zhou et al, 2015), as catalysts (Frusteri et al, 2016, Maciá-Agulló et al, 2010 or even as boosters to produce pure water as we reported recently (Celzard et al, 2019).…”

Section: Figurementioning

confidence: 98%

“…Ultimate analyses of samples were carried out in a CHONS elemental analyser (Vario El cube, Elementar) as reported elsewhere (Celzard et al, 2019). Temperature-Programmed Desorption (TPD) experiments were performed with a custom-built set-up, consisting of a tubular quartz reactor placed inside an electric furnace.…”

Section: Materials Characterisationmentioning

confidence: 99%

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Synthesis and properties of carbon microspheres based on tannin–sucrose mixtures treated in hydrothermal conditions

Sánchez-Sánchez

Braghiroli

Izquierdo

et al. 2020

Industrial Crops and Products

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Sustainable carbon materials have been synthesised by use of inexpensive natural precursors, tannin and sucrose, mixed in aqueous solution in various proportions (from 0:1 to 1:0), and then submitted to hydrothermal carbonisation (HTC) at various pH (from 2 to 8) and temperatures (160, 180 or 200°C). The resultant hydrochars were finally pyrolysed at 900°C under nitrogen flow to produce highly porous carbon materials with BET areas as high as 810 m2/g without activation. The effects of the initial tannin/sucrose weight ratios and of the HTC conditions were investigated in terms of final particle size (from 1 to 10 µm), carbon yield (from 30 to 45%), composition (C from 88 to 93 wt. %; O from 6 to 10 wt. %), surface chemistry (C from 88 to 98 at. %; O from 2 to 12 at. %) and porous texture (NLDFT surface areas and micropore volumes from 840 to 1420 m2/g and from 0.23 to 032 cm3/g, respectively). All these parameters were discussed and correlated with the electrochemical properties of the same materials. Special attention was paid to the separate roles of porosity and surface chemistry, and on the reversibility of the electrochemical reactions.

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Section: Figuresupporting

confidence: 60%

Section: Figurementioning

confidence: 98%

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Synthesis and properties of carbon microspheres based on tannin–sucrose mixtures treated in hydrothermal conditions

Sánchez-Sánchez

Braghiroli

Izquierdo

et al. 2020

Industrial Crops and Products

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“…The intensity of the D 1 band (I D1 ) is higher than that of the G band (I G ) for the examined CFs, including the ones (GR2, GR4, GP6 and GP8) manufactured with a higher final heat-treatment temperature, above 2000 • C. For the corresponding CFs pairs (see Figure S4), this I D1 /I G ratio increases gradually, which is an additional indication that these CFs are in the carbonisation regime, whereas in the graphitisation regime, one should expect the contrary [38]. Again, it is likely that only lateral graphite nanocrystallite growth occurs with a supposed lack of the tri-periodic stacking of carbon layers.…”

Section: Raman Spectroscopy Analysismentioning

confidence: 91%

“…where λ is the wavelength of the used radiation (λ = 0.7093 Å) and θ is the Bragg angle of the (002) reflection, was thus used to obtain the value of d 002 , whereas L c was calculated from the conventional Scherrer equation [38]:…”

Section: X-ray Diffraction (Xrd)mentioning

confidence: 99%

Structural Characterisation and Chemical Stability of Commercial Fibrous Carbons in Molten Lithium Salts

et al. 2019

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The growing trend towards sustainable energy production, while intermittent, can meet all the criteria of energy demand through the use and development of high-performance thermal energy storage (TES). In this context, high-temperature hybrid TES systems, based upon the combination of fibrous carbon hosts and peritectic phase change materials (PCMs), are seen as promising solutions. One of the main conditions for the operational viability of hybrid TES is the chemical inertness between the components of the system. Thus, the chemical stability and compatibility of several commercial carbon felts (CFs) and molten lithium salts are discussed in the present study. Commercial CFs were characterised by elemental analysis, X-ray diffraction (XRD) and Raman spectroscopy before being tested in molten lithium salts: LiOH, LiBr, and the LiOH/LiBr peritectic mixture defined as our PCM of interest. The chemical stability was evaluated by gravimetry, gas adsorption and scanning electron microscopy (SEM). Among the studied CFs, the materials with the highest carbon purity and the most graphitic structure showed improved stability in contact with molten lithium salts, even under the most severe test conditions (750 °C). The application of the Arrhenius law allowed calculating the activation energy (in the range of 116 to 165 kJ mol−1), and estimating the potential stability of CFs at actual application temperatures. These results confirmed the applicability of CFs as porous hosts for stabilising peritectic PCMs based on molten lithium salts.

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Recent Advances of Green Electricity Generation: Potential in Solar Interfacial Evaporation System

Wang,

Cao,

Cui

et al. 2024

Advanced Materials

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Solar‐driven interfacial evaporation (SDIE) has played a pivotal role in optimizing water‐energy utilization, reducing conventional power costs, and mitigating environmental impacts. The increasing emphasis on the synergistic co‐generation of water and green electricity through SDIE is particularly noteworthy. However, there is a gap of existing reviews that have specifically focused on the mechanistic understanding of green power from WEC systems, the structure‐activity relationship between efficiency of green energy utilization in WEC and materials design in SDIE. Particularly it lacks a comprehensive discussion to address the challenges faced in these areas along with potential solutions. Therefore, this review aims to comprehensively assess the progress and future perspective of green electricity from water‐electricity co‐generation (WEC) systems by investigating the potential expansion of SDIE. Firstly, it provides a comprehensive overview about materials rational design, thermal management and water transportation tunnels in SDIE. Then it summarizes diverse energy sources utilized in the SDIE process, including steaming generation, photovoltaics, salinity gradients effect, temperature gradients effect, and piezoelectric effect. Subsequently, it explores factors that affect generated green electricity efficiency in WEC. Lastly, this review proposes challenges and possible solution in the development of WEC. The timely emergence of this review will promote the sustainable use of energy.This article is protected by copyright. All rights reserved

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Floating hollow carbon spheres for improved solar evaporation

Cited by 23 publications

References 60 publications

Synthesis and properties of carbon microspheres based on tannin–sucrose mixtures treated in hydrothermal conditions

Synthesis and properties of carbon microspheres based on tannin–sucrose mixtures treated in hydrothermal conditions

Structural Characterisation and Chemical Stability of Commercial Fibrous Carbons in Molten Lithium Salts

Recent Advances of Green Electricity Generation: Potential in Solar Interfacial Evaporation System

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