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Journal of Colloid and Interface Science
Academic Press
Journal of Colloid and Interface Science

Academic Press

0021-9797

Journal of Colloid and Interface Science/Journal Journal of Colloid and Interface ScienceSCIAHCIISTPEI
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    BiO(OH)(x)I1-x solid solution with rich oxygen vacancies: interlayer guest hydroxyl for improved photocatalytic properties

    Ji, HuanhuanHu, ChunZhang, SaiZhang, Lili...
    12页
    查看更多>>摘要：A series of BiO(OH)(x)I1-x solid solution (SS) catalysts were successfully prepared by ion exchange of I- and OH- between the [Bi2O2](2+) layers. The morphology and microstructure were studied in depth using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and Brunauer-Emmett-Teller (BET) method, etc. Tunable absorption in the visible-light region was achieved by changing the proportion of OH- to I-. Due to the etching effect of OH-, oxygen vacancies (OVs) greatly increased for the SS catalysts, and were confirmed by X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance spectroscopy (DRS), and electron paramagnetic spectroscopy (EPR). The unique composition of OH-, I-, OV, and [Bi2O2](2+) layers in BiO(OH)(x)I1-x materials resulted in diverse photoexcitations. The BiO(OH)(0.45)I-0.55 photocatalyst displayed a 10-fold-improved 2-chlorophenol (2-CP) degradation rate compared to BiOI. The interfacial reaction process by the photoinduced valence-band holes and conduction-band electrons proved to be a more efficient pathway for organic pollutant degradation by the BiO(OH)(x)I1-x SS photocatalyst. The OVs in the SS photocatalyst facilitated photoexcited and electron migration and transformation. (C) 2021 Published by Elsevier Inc.
      原文链接:
    • NSTL
    • Elsevier

    A generalizable strategy for constructing ultralight three-dimensional hierarchical network heterostructure as high-efficient microwave absorber

    Li, ChenLi, ZihanQi, XiaosiGong, Xiu...
    10页
    查看更多>>摘要：Using previous models and theories to construct and develop high-efficient microwave absorbers (MAs) should be a strategic and effective ways to optimize the electromagnetic wave attenuation. Herein, the ultralow density and flexible graphene oxide foam (GOF) and reduced graphene oxide foam (RGOF)/MoS2 nanosheets were designed and fabricated by the method of chemical vapor deposition and hydrothermal reaction. The obtained GOF and RGOF/MoS2 samples exhibited very excellent microwave absorption properties while their densities were merely 0.0082 and 0.0084 g.cm(3), respectively. More importantly, benefiting from the excellent synergistic effect between RGOF and MoS2, the designed RGOF/MoS2 well inherited the combined advantages of GOF and MoS2 in terms of strong absorption abilities, broad absorption bandwidth and thin matching thicknesses. The values of minimum reflection loss and effective frequency bandwidth for RGOF/MoS2 sample could reach up to -62.92 dB with the matching thickness of 2.27 mm and 4.48 GHz with the matching thickness of 2.12 mm, which were very desirable for high-performance MAs. Moreover, the obtained results indicated that the microwave absorption properties of RGOF/MoS2 sample could be further optimized by regulating the MoS2 content. Therefore, a new and effective strategy was proposed to develop high efficiency MAs with ultra-lightweight, wide band, thin thickness and strong absorption capabilities. (C) 2021 Elsevier Inc. All rights reserved.
      原文链接:
    • NSTL
    • Elsevier

    Yolk-shell ZnO@C-CeO2 ternary heterostructures with conductive N-doped carbon mediated electron transfer for highly efficient water splitting

    Celebi, NuraySalimi, Kouroush
    10页
    查看更多>>摘要：Herein, carbon-incorporated yolk-shell ZnO@C-CeO2 ternary heterostructures are employed as visible light responsive photocatalyst for highly efficient photoelectrochemical (PEC) water splitting. Compared to conventional ZnO/CeO2 semiconductors, introduction of a thin PDA shell layer assures the generation of a conductive N-doped graphitic carbon layer after a calcination post-treatment with mesoporous hollow morphologies. The evaluation of PEC water splitting performance of ZnO@C-CeO2 photoanodes reveals the maximum photocurrent density as 7.43 mA/cm(2) at 1.18 V RHE under light whereas almost no response is recorded at dark. These superior PEC H-2 evolution performance strongly implies efficient charge separation, facilitated charge transfer between photoanode and electrolyte inter-face as well as within the semiconductor bulk by means of rapid electron transfer ability of N-doped graphitic carbon layer and prolong life time of light inside yolk-shell structure. Furthermore, considerable depression in PL intensity of ZnO@C-CeO2 photoanodes compared to ZnO clearly reveals a higher photon absorption due to the reflection of light in hollow region and increase in electron hole separation effi-ciency. Moreover, plausible Z-scheme charge transfer mechanism using ZnO@C-CeO2 photoanodes under visible light illumination is verified using radical trapping experiments and X-ray photoelectron spectroscopy (XPS) methods, suggesting new generation of heterostructures for sufficient conversion of sun-light to H-2 fuels. (C) 2021 Elsevier Inc. All rights reserved.
      原文链接:
    • NSTL
    • Elsevier

    The kinetic of calcium silicate hydrate formation from silica and calcium hydroxide nanoparticles

    Camerini, RachelPoggi, GiovannaRidi, FrancescaBaglioni, Piero...
    11页
    查看更多>>摘要：Hypothesis: The mechanism of calcium silicate hydrate (CSH) formation, a relevant component of cement, the largest used material by mankind, is well documented. However, the effects of nano-sized materials on the CSH formation have not yet been evaluated. To this aim, a kinetic study on CSH formation via the "pozzolanic reaction" of nanosilica and calcium hydroxide nanoparticles, and in the presence of hydroxypropyl cellulose (HPC) as hydration regulator, is reported in this paper. Experiments: The reagents were mixed with water and cured at 10, 20, 30 and 40 degrees C. The reaction kinetics was studied with differential scanning calorimetry (DSC). A Boundary Nucleation and Growth model (BNGM) combined with a diffusion-limited model was used to analyze the data, yielding induction times, reaction rates, activation energies, nucleation and linear growth rates, and the related diffusion coefficients. Findings: The rate constants k(B) and k(G), which are, respectively, the rate at which the nucleated boundary area transforms, and the rate at which the non-nucleated grains between the boundaries transform, increase with temperature. Their different temperature dependence accounts for the prevailing effect of nucleation over nuclei growth at progressively lower temperatures. The nucleation rate, I-B, is strongly enhanced when using nanomaterials, while the linear growth rate, G, is limited by the tightly packed structure of the transforming matrix. HPC influences the kinetics between 10 and 30 degrees C; at 40 degrees C the temperature effect becomes predominant. HPC delays induction and acceleration periods, increases E-a(k(B)), and enhances the reaction efficiency during the diffusion regime, by retaining and delivering water over the matrix, thus allowing a higher water consumption in the hydration reaction of CSH. (C) 2021 Elsevier Inc. All rights reserved.
      原文链接:
    • NSTL
    • Elsevier

    In-situ oxidation of Palladium-Iridium nanoalloy anchored on Nitrogen-doped graphene as an efficient catalyst for methanol electrooxidation

    Shu, JunhaoLi, RuxiaLian, ZhuomingZhang, Wei...
    10页
    查看更多>>摘要：Palladium (Pd)-based materials have been widely used as catalysts for the methanol oxidation reaction (MOR). Unfortunately, the catalytic activity was limited by structure, carbon monoxide intermediates (COads) tolerance and stability. It was currently difficult to be used in large-scale commercial production. Herein, to further improve their electrocatalytic activity, a facile oxidation method to achieve in-situ oxidation of palladium-iridium (PdIr) alloy on nitrogen-doped graphene (NGS) is used, which is named as Pd-Ir-O/NGS. The new catalyst exhibits remarkable MOR activity (1374.8 mA mg-1), COads tolerance (the onset oxidation potential reach 0.725 V) and stability (the current density retention rate after 500 cycles of cyclic voltammetry is 44.9%). As a catalyst for MOR, the Pd-Ir-O/NGS has more outstanding electrocatalytic performance compared with commercial Pd/C and other counterparts. The mechanism study shows that the excellent catalytic performance is attributed to (1) the synergistic electronic effect of PdIr-O due to the introduction of Ir and O, (2) the insertion of O into PdIr alloy that kinetically accelerated the oxidation of poisoning methoxy intermediates and (3) the vital roles of unique three-dimensional (3D) structure of NGS with abundant nitrogen atoms. Our findings herald a new paradigm for the modification of palladium-based materials for MOR and provide an alternative design principle for novel 3D carbon-based material for various application. (c) 2021 Elsevier Inc. All rights reserved.
      原文链接:
    • NSTL
    • Elsevier

    Sulfur contributes to stable and efficient carbon-based perovskite solar cells

    Liu, CaiyunHe, ZhenLiu, AnminCai, Rui...
    6页
    查看更多>>摘要：The power conversion efficiency (PCE) of perovskite solar cells (PSCs) is already higher than those of other thin-film photovoltaic technologies, but the stability issue limits their applications. The introduction of sulfur-based compounds in PSCs could contribute to their stability. Herein, sulfur-based compounds have been embedded into each functional layer to stabilize carbon-based PSCs (C-PSCs). Results showed that the simultaneous introduction of sulfur-based compounds could decrease the trap states of perovskite film, enlarge the grain size of perovskite, and accelerate the charge transfer and extraction, leading to an improved performance. Comparing with the device without sulfide (10.77%), all sulfide C-PSCs obtained a PCE of 15.38%. The stability test showed much better resistance to humidity and thermal stress for all sulfide C-PSCs. They could retain 80% of initial PCE after aging about 700 hat relative humidity (RH) 45% +/- 10% and 80 degrees C. (c) 2021 Published by Elsevier Inc.
      原文链接:
    • NSTL
    • Elsevier

    Enhanced light-to-thermal conversion performance of all-carbon aerogels based form-stable phase change material composites

    Li, AnWang, ChengjunWang, LinqiangLiang, Weidong...
    11页
    查看更多>>摘要：The exploitation of excellent performance form-stable phase change material composites (FS-PCMCs) with enhanced photothermal conversion efficiency and high phase change latent heat is of great significance for thermal energy storage. In this work, a new type of FS-PCMCs with superior light-to-thermal conversion performance were created by impregnation of organic phase change material (1-hexadecylamine (HDA) and 1-tetradecylamine (TDA)) into the graphene aerogel (GA) and all-carbon aerogel (GCA) through a simple direct infusion. The multiwalled carbon nanotubes (MWCNTs) are wound around the inner wall of the GA layer to form a three-dimensional (3D) porous network structure to support fatty amine (FAs), thus achieving shape stability before and after phase transition. Moreover, the FSPCMCs has extremely high phase transition enthalpy (203.1-248 kJ.kg(-1)) and good recyclability. More importantly, due to the high absorbance of GCA, it can enhance its light absorption capacity and reduce thermal radiation. The light-to-thermal conversion efficiency of the FS-PCMCs is 72.36%-88.25%. Taking the improvement of the comprehensive properties of the FS-PCMCs, the results of this work may open up a way for rational design and preparation of high-performance FS-PCMCs with enhanced storage capacity and light-to-thermal conversion efficiency for the efficient utilization of solar energy. (C) 2021 Elsevier Inc. All rights reserved.
      原文链接:
    • NSTL
    • Elsevier

    One step synthesis of N, P co-doped hierarchical porous carbon nanosheets derived from pomelo peel for high performance supercapacitors

    Li, GuifangLi, YawenChen, XiaofenHou, Xinyi...
    11页
    查看更多>>摘要：Ammonium dihydrogen phosphate (NH4H2PO4) was used as an activator and co-dopant to induce the synthesis of N, P co-doped porous carbon nanosheets (NPCNs) from pomelo peel for using as high-performance supercapacitors. Pomelo peel has a unique sponge-like structure in which NH4H2PO4 particles can be evenly embedded. The pore structure and heteroatomic doping amount of NPCNs were controlled by adjusting the pyrolysis temperature. As a result, the optimal sample exhibits high specific capacitance (314 +/- 2.6 F g(-1)) and rate capability (82% of capacitance retention at 20 A g(-1)). NPCNs750 was further employed in a symmetrical supercapacitor (NPCNs-750//NPCNs-750 SSC) with 2 M Li2SO4 electrolyte, and exhibits a high energy density of 36 +/- 1.5 W h kg(-1) at a power density of 1000 W kg(-1), with excellent cycling stability with 99% retention after 10,000 cycles. A series of excellent results show that this pollution-free and cost-effective method can be used for the design and preparation of high-performance supercapacitor electrode materials. (C) 2021 Elsevier Inc. All rights reserved.
      原文链接:
    • NSTL
    • Elsevier

    Highly selective hydrogenation of phenol to cyclohexanone over a Pd-loaded N-doped carbon catalyst derived from chitosan

    Wu, QiongWang, LuZhao, BaozhengHuang, Lang...
    9页
    查看更多>>摘要：A highly stable Pd-loaded N-doped carbon catalyst (ACN(pd)) for phenol hydrogenation was prepared from chitosan by hydrothermal carbonization. ACN(pd) does not require a reduction step before catalytic use due to the Pd in the as-prepared catalyst mainly exists in the form of Pd-0 (80%). The carbon support involves N-containing groups such as pyridinic nitrogen and pyrrolic nitrogen, which could provide basic sites to adsorb phenol effectively. The as-fabricated ACN(pd) shows high catalytic performance with turnover frequency (TOF) of 29.34 h(-1). Accordingly, a phenol conversion of 100% and a cyclohexanone selectivity of 99.1% are achieved in 5 h at 100 degrees C and 1 MPa H-2. This outstanding performance is attributed to the synergetic effects of the Pd particles, the N-functional groups, and the Lewis acid sites on the support. The carbon support presents intrinsic Lewis acid sites due to its electrophilicity, and Pd doping further increases the strength of such acid sites as it causes electron-deficient structural features. Moreover, the Lewis acid sites inhibit the over-hydrogenation from cyclohexanone to cyclohexanol. This study provides new insights into the application of functional biomass-based carbon materials as catalyst supports. (C) 2021 Elsevier Inc. All rights reserved.
      原文链接:
    • NSTL
    • Elsevier

    Determination of dynamic interactions of droplets in continuous fluids using droplet probe

    Lan, WenjieCai, DizongHu, XiaojieJing, Shan...
    10页
    查看更多>>摘要：Hypothesis: Interactions between droplets are of fundamental importance for understanding phenomena involving droplet collision and coalescence that determine multiphase flow behavior. The quantitative understanding of these interactions is essential for the manipulation and control of emulsions or complex fluids. The existing methods for interaction force determination are typically based on expensive mechanical probes and fine distance control. Therefore, further development of new techniques for interaction force determination is expected to be beneficial for research on surface force. Experiments: In this study, droplet deformation during the interaction between two droplets was captured and analyzed to determine the interaction force. The approach speed of the two droplets was controlled by the injection rate of the fluid. The dynamic interaction force between two tetradecane droplets in various aqueous solutions was determined using the newly developed method, and the effects of twophase physical properties and operating conditions on the measurement errors were investigated. Findings: The droplet profile deformation was first applied as a probe to detect the interaction force. The measurement results were in good agreement with those obtained using the precise weighing sensor of a commercial interfacial tensiometer (K100, Kruss, Germany). The newly developed method was reliable, simple, and did not require the use of expensive devices. Furthermore, droplet deformability was found to be the key parameter in determining the total interaction force between the droplets. (c) 2021 Elsevier Inc. All rights reserved.
      原文链接:
    • NSTL
    • Elsevier