Development and Characterization of Mesoporous Silicate–LiCl Composite Desiccants for Solid Desiccant Cooling Systems

Xu, Zheng; Ge, T.S.; Hu, Liguo; Wang, Ruzhu

doi:10.1021/ie504948j

Cited by 37 publications

(11 citation statements)

References 29 publications

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“…Different from the Au cathode, which has an average particle diameter around 0.5–0.8 μm, the Pt black used in this study has an average primary particle diameter of 6.5 nm, which suggests a mesoporous electrode structure. As shown in the measurements of carbon particles with mesoporous structure by Zheng et al ., the presence of mesopore will lead to a shift of condensation of a porous material towards RH conditions much lower than 100 % due to capillary condensation. The shape of the isotherms suggests unrestricted multilayer water adsorption on the Pt black and negligible hysteresis due to capillary condensation in mesopores.…”

Section: Resultsmentioning

confidence: 97%

Ionic Conductivity over Metal/Water Interfaces in Ionomer‐Free Fuel Cell Electrodes

Zhang

Babu

et al. 2019

ChemElectroChem

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Ion conduction and oxygen reduction reaction (ORR) kinetics at metal/water interfaces are important in determining the performance of proton exchange membrane fuel cells (PEMFCs). However, the coupled ion transport and electrochemical reactions in ionomer‐free domains of catalyst layers are still unclear. In this work, we deconvolute the ion transport and oxygen reduction reaction (ORR) by studying metal/water interfaces of platinum (Pt) and gold (Au) ionomer‐free porous cathodes. In our experiments, a conventional membrane electrode assembly (MEA) was used for electrochemical characterization of ionomer‐free electrodes. Cyclic voltammetry (CV) and polarization curve measurements at different relative humidity (RH) conditions show that active surface area and ORR current density increases with RH. We also use microstructured electrode scaffold (MES) apparatus for measurement of the ionic conductivity in the cathode. The results show that the ionic conductivity increases with the RH and water coverage. The potential dependence of ionic conductivity for Au approximately follows the classical Guoy‐Chapman electrical double layer (EDL) behavior, while the ionic conductivity of the Pt electrode did not show a strong potential dependence, indicating that it could also be affected by other mechanisms, such as formation of surface oxide and diffusion of adsorbed hydrogen on its surface.

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Section: Resultsmentioning

confidence: 97%

Ionic Conductivity over Metal/Water Interfaces in Ionomer‐Free Fuel Cell Electrodes

Zhang

Babu

et al. 2019

ChemElectroChem

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“…Dehumidification capacity is one of the crucial performance indexes in a DCHE system, which can be affected by average humidity removal during an effective dehumidification process. Average humidity removal and dehumidification capacity can be calculated by in which D avg means the average humidity removal, g/g; Q d means the dehumidification capacity, g/h; m a means the mass flow rate of inlet air, g/s; w ai and w ao mean the inlet and outlet air humidity ratios, respectively, g/g; and t d means the effective dehumidification time (please refer to ref for detailed information), s.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of Alginate–Silica Gel Composites for Adsorption Dehumidification

Chen

Lin

2020

Ind. Eng. Chem. Res.

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Desiccant coated heat exchanger (DCHE)-based adsorption dehumidification systems have great potential for energy conservation and emission reduction. The selection of desiccant materials can greatly impact the overall performance of DCHE systems. However, the unsatisfied adsorption quantity of widely used silica gel at middle relative humidity range and the possible corrosion problem of salt-supported silica gel are bottlenecks for the engineering application. A strategy for synthesizing novel alginate–silica gel composites that have fair adsorption quantity without corrosion is demonstrated. Textural properties suggested that silica gel particles can be well distributed in the surface of composite samples with the liquid–solid mixing and post cross-linking method. Dynamic water adsorption test showed that the composite with a sodium alginate-to-silica gel mass ratio of 5:1 possessed the best water adsorption kinetics. Water adsorption quantity difference of the composite between a typical adsorption condition (80% RH) and a regeneration condition (30% RH) is more than twice that of silica gel. Dehumidification capacities of the composite-coated DCHE were 34–60% higher than those of a silica gel-coated DCHE under set simulation conditions. This method offers a promising way of material synthesis for researchers who are interested in the area of coatings, separations, dehumidification, etc.

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“…1,2 With the increased need for indoor comfort, energy consumed in air treatment in a hot summer accounts for ∼30% of total energy consumption. 3,4 How to improve energy efficiency in air-conditioning technologies has drawn increased attention.…”

Section: Introductionmentioning

confidence: 99%

“…Food, clothing, shelter, and transportation require energy. Meanwhile, the globe confronts with great challenges in energy consumption. , With the increased need for indoor comfort, energy consumed in air treatment in a hot summer accounts for ∼30% of total energy consumption. , How to improve energy efficiency in air-conditioning technologies has drawn increased attention.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Application of UiO-66 in Desiccant-Coated Heat Exchanger-Based Desiccant Cooling Systems

Tan

et al. 2021

Ind. Eng. Chem. Res.

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Dehumidification performance of a high-efficient compact desiccant cooling component named desiccant-coated heat exchanger (DCHE) highly depends on coated desiccant materials. Currently, mesoporous silica gels and salt-supported silica gels have been extensively studied. Silica gels have limited adsorption quantity in the middle relative pressure range, while salt-supported silica gels have potential threat of corrosion. In this work, a metal–organic framework UiO-66 that can achieve good adsorption quantity without corrosion is reported. The equilibrium adsorption test shows that UiO-66 has promising water uptake, especially in the relative pressure range of 0.35–0.65. The adsorption kinetics test displays that UiO-66 exhibits desirable dynamic water uptakes and adsorption rate constant. Dehumidification capacities of a DCHE using UiO-66 are estimated via a mathematical model and compared with silica gel- (SG) and LiCl-supported silica gel (SG/LiCl). Simulation results show that UiO-66 has better dehumidification performance than both SG- and SG/LiCl-coated samples for semiarid and semihumid climates when outdoor temperature is lower than 36 °C. Especially, when the temperature and relative pressure of inlet air are set as 30 °C and 0.35, respectively, its dehumidification capacity can be 2.7 times the amount of the SG-coated one and 1.3 times of the SG/LiCl-coated one. However, it should be more prudent in choosing UiO-66 under hot and humid climates.

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Development and Characterization of Mesoporous Silicate–LiCl Composite Desiccants for Solid Desiccant Cooling Systems

Cited by 37 publications

References 29 publications

Ionic Conductivity over Metal/Water Interfaces in Ionomer‐Free Fuel Cell Electrodes

Ionic Conductivity over Metal/Water Interfaces in Ionomer‐Free Fuel Cell Electrodes

Synthesis and Characterization of Alginate–Silica Gel Composites for Adsorption Dehumidification

Preparation and Application of UiO-66 in Desiccant-Coated Heat Exchanger-Based Desiccant Cooling Systems

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