Institutional Repository of Institute of Process Engineering, CAS (IPE-IR）
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Construction of Co3O4/CeO2 heterostructure nanoflowers facilitates deployment of oxygen defects to enhance the oxygen evolution kinetics
No full textThe bottom-up design strategy can more rationally optimize the composition and structure of the materials to impart excellent oxygen evolution reaction (OER) performance. Heterostructures can modulate electronic behavior through interface construction to optimize materials properties for superior OER performance. In this paper, we created abundant Co3O4/CeO2 phase interfaces to tune the grain size, the electronic con-figuration of cobalt sites, and the content of oxygen defects in Co3O4, which increases the number of active sites, enhances the electronic conductivity of the material, and optimized the adsorption energy for reaction intermediates. Moreover, the assembly of nanograins into nanoflowers with a three-dimensional hier-archical pore structure can provide more effective active sites, abundant pores and channels for mass transport, and discrete cavities for in-depth reactions of intermediates. The construction of Co3O4/CeO2 heterostructure nanoflowers (CoCe HNFs) contributes to the excellent OER performance of the catalyst. (c) 2022 Elsevier B.V. All rights reserved
Poly(ionic liquid) boosts overall performance of electrocatalytic reduction of low concentration of CO gas
No full textElectrocatalytic reduction of CO (CORR) provides a feasible way for not only CO2 conversion via tandem CO2-to-CO-to-C2+ process but also CO utilization from industrial exhaust gases. In this work, poly(ionic liquid) modified Cu catalyst (Cu@PIL) was employed as the electrocatalyst to convert low concentration CO gas to high-value C2+ products. An over 90 % faradaic efficiency of C2+ products (FEC2+) was obtained at a constant current density of 125.0 mA cm(-2) within a broad range of feedstock concentrations from 100.0 to 40.0 vol%. Remarkably, excellent comprehensive performance was achieved with feeding CO gas as less as 5.0 vol%, delivering a high FEC2+ of 71.1 % with high CO conversion (67.4 %) and high energetic efficiency (29.1 %). Mechanistic studies suggest the local enrichment of CO via adsorption and accelerated mass transfer by porous PIL layer as well as the suppression of hydrogen evolution reaction enables the CO-to-C2+ transformation with diluted CO gas
Dual-site eutectic ionic liquids based microemulsion for boosting selective dimerization of isobutene
No full textOligomerization is one of the efficient routes for making use of C4 olefins to produce high value-added chemicals. However, high reagent conversion is usually accompanied by low dimer product selectivity, and vice versa. Ionic liquids (ILs) with intense interaction between Lewis and Bronsted acidic sites were demonstrated to be excellent catalysts for butene oligomerization. Furthermore, it was found that eutectic IL could be formed by strong hydrogen bond when alcohol was added to the IL, which exhibited enhanced butene solubility and thus improved catalytic performance. Moreover, microemulsion could be constructed by adding an IL emulsifier into the IL catalyst, and the improved interfacial area further enhanced efficient contact between butene and catalyst. Combining the strategies of employing dualsite eutectic IL as the catalyst and microemulsion formation, butene conversion could reach 98%, while dimer selectivity was 91%, resolving the contradiction that high conversion and target product selectivity cannot be achieved simultaneously
A regenerative core-shell LTA@LDH adsorbent for indoor dehumidification and its improved adsorption performance
No full textDehumidification is vital for human health and environmental sustainability. However, traditional moisture adsorbents have the problems like low adsorption capacity, high regeneration energy consumption and negative impacts to environment. As a result, it is demanding to develop environmentally friendly adsorbents with desirable adsorption capacity and convenient regeneration. Herein, a Linde type A zeolite@Mg-Al layered double hydroxides (LTA@LDH) with core-shell structure is synthesized by a facile in-situ co-precipitation method and used for indoor dehumidification. The LTA@LDH with hierarchically porous structure presents advantageous synergism of micro-mesopores, and exhibits a better adsorption and desorption performance than the pure LTA. The whole water uptake capacity of LTA@LDH is 0.339 g.g- 1 in relative humidity 95 % & 30 degrees C, much higher than that of pure LTA (0.248 g.g(-1)). The desorption activated energy of LTA@LDH is 53.92 kJ.mol(-1), nearly half of pure LTA (88.63 kJ.mol(-1)), indicating its superior desorption performance. The adsorption activity of LTA@LDH remains unchanged after fifteen consecutive adsorption-regeneration cycles. Based on various characterizations, a three-stage dehumidification model of LTA@LDH was proposed to reveal its unique sorption behaviors: (1) capillary condensation mainly in LTA's micropores; (2) mono-layer order water absorbed in LDH's mesopores; and (3) multi-layer water absorbed in LDH's mesopores. This work provides a new approach to design and develop zeolite-based adsorbents by introducing LDH and designing unique core-shell structure
Lanthanide complexes functionalized carbon dot nanocomposites as lubricant additives for improving tribological performance
No full textA novel nanocomposite, CDs-La-EDTA, was synthesized by bonding carbon dots to the functional sites of rare earth complexes, and its tribological characteristics were evaluated as lubricant additives. The results showed that the mean friction coefficient and the wear scar diameter of lubricating oil containing 0.15 wt% CDs-La-EDTA were reduced by 14% and 22%, respectively, compared with those of the base oil. Furthermore, the dual lubrication mechanism of the nanocomposite was proposed. The rolling or sliding effect of rare earth nanofibrous rods and the mending effect of carbon dot particles contributed to excellent lubrication performance