Journal of Advanced Ceramics
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2022
·Vol. 11
·期 12
·1988-2000
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IF 11.534
Qiu Peng,Liu Bo,Wu Lei,Qi Huiying,Tu Baofeng,Li Jian,Jia Lichao
Slow oxygen reduction reaction (ORR) involving proton transport remains the limiting factor for electrochemical performance of proton-conducting cathodes. To further reduce the operating temperature of protonic ceramic fuel cells (PCFCs), developing triple-conducting cathodes with excellent electrochemical performance is required. In this study, K-doped BaCo 0.4 Fe 0.4 Zr 0.2 O 3− δ (BCFZ442) series were developed and used as the cathodes of the PCFCs, and their crystal structure, conductivity, hydration capability, and electrochemical performance were characterized in detail. Among them, Ba 0.9 K 0.1 Co 0.4 Fe 0.4 Zr 0.2 O 3− δ (K10) cathode has the best electrochemical performance, which can be attributed to its high electron (e − )/oxygen ion (O 2− )/H + conductivity and proton uptake capacity. At 750 °C, the polarization resistance of the K10 cathode is only 0.009 Ω·cm 2 , the peak power density (PPD) of the single cell with the K10 cathode is close to 1 Wcm −2 , and there is no significant degradation within 150 h. Excellent electrochemical performance and durability make K10 a promising cathode material for the PCFCs. This work can provide a guidance for further improving the proton transport capability of the triple-conducting oxides, which is of great significance for developing the PCFC cathodes with excellent electrochemical performance.
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DIAMOND AND RELATED MATERIALS
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2022
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IF 3.806
Xuehan Xiao,Zongxue Yu,Zhong Yang,Juan Wang,Qingcan Xiang Ximei Zhu
The treatment of oilfield wastewater has been a problem for oil workers for a long time. Indeed, it is economical, efficient and environmental friendly to treat oilfield wastewater with membrane. However, the contamination and stability of membrane limit the application of membranes. This study focuses on improving the long-term integrated treatment of oilfield wastewater by commercial PVDF membranes in different environments. Sepiolite(Sep)@MnO 2 composites were synthesized by hydrothermal method . SEP@MnO 2 and graphene oxide(GO) were left on the commercial PVDF membrane after vacuum filtration. Then the membrane was subjected to 120 vacuum thermal reduction. The prepared Sep@MnO 2 /RGO composite membrane showed good separation result and flux for different proportion of oilfield wastewater. Moreover, it can remove some common salt (NaCl,MgSO 4 , CaCl 2 , MgCl 2 ) and heavy metal ions (Ni 2+ , Fe 3+ , Cr 6+ ) in oilfield wastewater. Even more valuable, a few addition of H 2 O 2 to oilfield wastewater caused an oxidation reaction and the produced in situ microbubbles greatly enhance the antifouling property of the membrane. After 15 cleaning tests and 12 h of cycling, the membrane still showed strong separation ability. Compared with other oil-water separation membranes reported, this membrane demonstrated a longer and better separation effectively. All the work promotes the application of membrane separation technology in oilfield wastewater treatment . Hopefully, the application of in-situ microbubble method on membrane will solve the problem of membrane pollution in oilfield wastewater treatment.
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CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Shunzhang You,Dao-Sheng Liu,Minghui Ye,Yufei Zhang,Yongchao Tang,Xiaoqing Liu,Cheng Chao Li
Aqueous zinc-ion batteries (ZIBs), the next promising energy technology with outstanding specific capacity, environmental friendliness, and safety, suffer from the dendritic growth and corrosion of Zn anode along with the release of hydrogen. To solve these issues, the graphite intercalation compounds of molybdenum chloride (MoCl 5 − GICs) are used as multi-functional interface layers to protect Zn anodes, inhibiting the parasitic reaction to improve the Coulombic efficiency (CE) of ZIBs. The MoCl 5 − GICs-coated Zn (Zn@MGs) exhibits the uniform deposition of Zn 2+ ions and enhances the transmission of Zn 2+ ions, given that the interfacial protection of MoCl 5 − GICs possesses high transference number of Zn 2+ ions (0.316), good ionic conductivity (9.45 × 10 −4 S cm −1 ), and low desolvated activation energy (1.88 kJ mol −1 ). Consequently, the symmetric Zn@MGs cell shows an excellent cycling stability for 2000 h at a current density of 1 mA cm −2 within an areal capacity of 1 mAh cm −2 . And it also delivers a long lifespan of 1300 h cycling at a high current density of 5 mA cm −2 . Paired with a NaV 3 O 8 ·1.5H 2 O (NVO) cathode, the Zn@MGs‖NVO full cell exhibits a splendid capacity retention of 63.8 % after 3000 cycles at 5 A g −1 . Therefore, the strategy of constructing multi-functional interface layer is a valuable method to facilitate the development of ZIBs.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Zetian Zhang,Yang Liu,Ze Liang,Fufen Li,Yong Yong,Zhengjun Li
Preparation of phase change materials with energy collection, conversion and storage functions is considered to be an important way to solve the energy shortage problem. Hence, a novel phase change capsule (EP@MGO) with photothermal conversion function was innovatively designed. In the process of preparing EP@MGO, the modified graphene oxide (MGO) layer was covalently anchored on the surface of the phase change capsule encapsulated by silica shell (EP) through Si-O-Si bonds, in which MGO was obtained by modifying GO nanosheets with isocyanate propyl triethoxysilane. The as-prepared EP@MGO microcapsule presents favorable latent heat storage capacity, with enthalpy of 139.8 J/g and high encapsulation efficiency of 83.6%. Besides, the thermal stability, leakage-proof property, durability, and thermal reliability of EP@MGO were enhanced significantly due to the physical protection effect provided by the SiO 2 -MGO double-layer shell. Moreover, the covalently MGO-grafted silica shell endows EP@MGO with high thermal conductivity (1.603 W/m·K), which improves its thermal management efficiency. More importantly, EP@MGO exhibits the potential ability to effectively utilize ultraviolet and visible light . In detail, the absorbance of EP@MGO increased by ∼192% in the ultraviolet and visible light region (200–800 nm), and the photothermal conversion efficiency under near infrared (NIR) region as high as 64.4%, which has negligible change (64.2%) even after 50 times heating-cooling cycle. Therefore, the phase change capsule EP@MGO provides a new idea for realizing efficient utilization of solar energy, and exhibits the application potential in biomedical treatment, smart textiles , and solar thermal collector.
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ENVIRONMENTAL TECHNOLOGY
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2022
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IF 3.475
Qiwen Jiang,Jialu Liu,Tiantian Qi,Yanhua Liu
The photocatalytic reduction of methylene blue was recognized as an economical and effective way for dye removal. To enhance photocatalytic activity under visible-light condition, fluorine and graphene synergistically modified TiO2 (F-TiO2/rGO) nanocomposites were successfully prepared by sol–gel method. Characterization results showed F ions played an essential role in the formation of TiO2 nanoparticles. Between the fluorine sources selected, NH4F was more optimal than NaF doping on the grounds that the existence of Na+ ion was an inevitable factor for the production of brookite. F-TiO2/rGO nanocomposite obtained by adding 5%at NH4F significantly narrowed the bandgap energy from approximately 3.17 to 2.41 eV. Box–Behnken design was adopted to optimize the MB photo-degradation process by F(5%NH4F)-TiO2/rGO nanocomposites under different reaction conditions. Moreover, the antibacterial behaviour of this novel material was also investigated by Escherichia coli (E. coli) bacteria under visible light. The morphology changes of E. coli cells were directly observed by field emission scanning electron microscope and further confirmed that the excellent sterilization of F-TiO2/rGO nanocomposites resulted from the active species. The outstanding photocatalytic performance and antibacterial behaviour of F-TiO2/rGO nanocomposite was attributed to the synergistic effect of photocatalytic redox reaction and adsorption. These results indicated F(5%NH4F)-TiO2/rGO nanocomposite was a promising antibacterial photo-adsorbent for wastewater treatment improvement.
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Energy Reports
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2022
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IF 4.937
Lili Jiang,Le Zhao,Guangyuan Chen,Meixia Li,Ruijia Zhang
In this study, octadecylamine/graphite foam composite phase change materials (ODA/GF CPCMs) were prepared by vacuum impregnation; octadecylamine (ODA) was used as the phase change materials (PCMs), and graphite foam (GF) was used as the support material. Polyurethane (PU) foam obtained after hydrolysis in 40 wt% NaOH solution at 80 °C for 30 min was the template for the GF; therefore, the prepared GF has many interpenetrating pore structures, providing many adsorption sites for PCMs. For the ODA/GF-3 CPCMs with 15 wt% graphite addition, the loading of ODA is as high as 92.3%, the thermal stability is excellent, the melting temperature is 52.1 °C, and the latent heat of fusion is 218. 1 J/g, which is 1.1 times that of pure ODA. The thermal conductivity of ODA/GF-3 CPCMs is 0.725 W/m•K, which is 2.2 times that of pure ODA. These results indicate that ODA/GF CPCMs have good thermal properties, and their competitiveness in the field of energy storage is greatly improved due to their excellent performance.
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COLLOIDS AND SURFACES B-BIOINTERFACES
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2022
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IF 5.999
Jinxin Liu,Zixi Zheng,Jialu Luo,Pan Wang,Gaohui Lu,Jianming Pan
Development of wound dressings that not only have multiple advantages including good biocompatibility, barrier properties, adhesive properties , but also exhibit anti-bacterial, anti-infection, and promote cell adhesion , accelerated wound healing process, remains challenging in the skin tissue engineering. In this work, a noninvasive adhesive biofoam with interconnectivity structure and antibacterial property was first-time designed through solid surfactant stabilized high internal phase emulsion (HIPE) template , where bacteriostatic Zn-CuO@GO nanosheets dynamic assemble with 4-vinylphenylboronic acid at the oil/water interface as cooperative emulsifier . Taking advantage of the cooperative assembly of the PBA/Zn-CuO@GO, the biofoams display microfibrousity and interconnectivity to facilitate material-cellular interaction as well nutrient exchange, and can effectively inhibit the growth of E. coli and S. aureus. Meanwhile, phenylboronic acid functional groups not only endow biofoam reversible adhesive property though dynamic phenylboronic acid/cis-diol interaction, but also facilitate the rearrangement of Zn-CuO@GO nanosheets in more uniform way at emulsion interface. Taken together, the biofoams can strongly adhere to the wound bed reducing the risk of infection and accelerate earlier tissue regeneration , which exhibit great potential in bioengineering application.
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Materials Today Communications
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2022
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IF 3.662
Feng Ouyang,Xiaoli Zhang,Tao Wang,Qi Shuai
The accurate determination of glucose in the human body is highly desired because excessive ingestion of glucose may lead to obesity, diabetes and other diseases. This work demonstrates a fluorescent probe for sugar detection using the unique affinity of boronates for cis -diols. The fluorescent sensing system is composed of two components: 1) Aminated graphene oxide (GON) decorated with phenylboronic acid (BPA) and 1,1′-ferrocenedicarboxylic acid (FCA) as a fluorescence quencher (FCA–GON–BPA); and 2) fluorophores of a cis -diol modified tetraphenylethylene derivative (TPBD) with aggregation-induced emission (AIE) characteristics as the luminescence. FCA–GON–BPA can selectively bind cis -diol-containing fluorogens, such as TPBD, resulting in fluorescence quenching of the probe system. Upon addition of glucose, a new cyclic boronate ester is formed, resulting in the cis -diol-containing fluorogen dissociating from the quenched system, and TPBD fluorescence is recovered. The probe has an obvious response to the presence of glucose and a low limit of detection (LOD, 4.36 mg/mL).
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Membranes
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2022
·Vol. 12
·期 10
·938
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IF 4.562
Haoyu Wang,Zhiyun Han,Yanjuan Liu,Maojin Zheng,Zhenbang Liu,Wei Wang,Yingying Fan,Dongxue Han,Li Niu
Developing efficient and recyclable membranes for water contaminant removal still remains a challenge in terms of practical applications. Herein, a recyclable membrane constituted of polyacrylonitrile-graphene and oxide-polydopamine was fabricated and demonstrated efficient adsorption capacities with respect to heavy metal ions (62.9 mg g−1of Cu2+ion, CuSO450 mg L−1) and organic dye molecules (306.7 mg g−1of methylene blue and 339.6 mg g−1of eriochrome black T, MB/EBT 50 mg L−1). The polyacrylonitrile fibers provide the skeleton of the membrane, while the graphene oxide and polydopamine endow the membrane with hydrophilicity, which is favorable for the adsorption of pollutants in water. Benefitting from the protonation and deprotonation effects of graphene oxide and polydopamine, the obtained membrane demonstrated promotion of the selective adsorption or desorption of pollutant molecules. This guarantees that the adsorbed pollutant molecules can be desorbed promptly from the membrane through simple pH adjustment, ensuring the reusability of the membrane. After ten adsorption–desorption cycles, the membrane could still maintain a desirable adsorption capacity. In addition, compared with other, similar membranes reported, this composite membrane displays the highest mechanical stability. This work puts forward an alternative strategy for recyclable membrane design and expects to promote the utilization of membrane techniques in practical wastewater treatment.Keywords:wastewater treatment;pH-dependent;membrane
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Frontiers in Bioengineering and Biotechnology
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2022
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IF 6.064
Li Jianfeng,Liu Xiao,Crook Jeremy M.,Wallace Gordon G.
Tissue engineered constructs can serve as in vitro models for research and replacement of diseased or damaged tissue. As an emerging technology, 3D bioprinting enables tissue engineering through the ability to arrange biomaterials and cells in pre-ordered structures. Hydrogels, such as alginate (Alg), can be formulated as inks for 3D bioprinting. However, Alg has limited cell affinity and lacks the functional groups needed to promote cell growth. In contrast, graphene oxide (GO) can support numerous cell types and has been purported for use in regeneration of bone, neural and cardiac tissues. Here, GO was incorporated with 2% (w/w) Alg and 3% (w/w) gelatin (Gel) to improve 3D printability for extrusion-based 3D bioprinting at room temperature (RT; 25°C) and provide a 3D cellular support platform. GO was more uniformly distributed in the ink with our developed method over a wide concentration range (0.05%–0.5%, w/w) compared to previously reported GO containing bioink. Cell support was confirmed using adipose tissue derived stem cells (ADSCs) either seeded onto 3D printed GO scaffolds or encapsulated within the GO containing ink before direct 3D printing. Added GO was shown to improve cell-affinity of bioinert biomaterials by providing more bioactive moieties on the scaffold surface. 3D cell-laden or cell-seeded constructs showed improved cell viability compared to pristine (without GO) bio-ink-based scaffolds. Our findings support the application of GO for novel bio-ink formulation, with the potential to incorporate other natural and synthetic materials such as chitosan and cellulose for advanced in situ biosensing, drug-loading and release, and with the potential for electrical stimulation of cells to further augment cell function.
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CHEMICAL ENGINEERING SCIENCE
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2022
·
IF 4.889
Wan-Jing Yu,Zhiyuan Liu,Qiongyu Dai,Maria A. Tsiamtsouri,Tianhui An,Hui Tong
Niobium-oxide based materials are well-known in electrochemical energy area because of their unique structural advantage, which can realize fast ion insertion/extraction and interfacial pseudo-capacitance effects. However, instinct poor electrical conductivity and terrible volume change of Nb 2 O 5 under lithiation/delithiation have hindered its practical application. Here, a three-dimensional (3D) graphene network has been constructed by a simple hydrothermal reaction and utilized to buffer the severe structural variation of Nb 2 O 5 . Meanwhile, silver nanoparticles have been incorporated into this 3D structure through silver-mirror reaction, by which the charge-transfer ability of the composite (Ag-Nb 2 O 5 @rGO) can be significantly improved. The obtained Ag-Nb 2 O 5 @rGO can contribute a charge capacity of ∼ 208.0 mAh/g at 0.5C and ∼ 106.6 mAh/g up to 20C. Meanwhile, superior cyclic performance with ∼ 80 % capacity retention after 500 cycles at 2.5C can be achieved. This demonstrates that the Ag-Nb 2 O 5 @rGO composite can work as a high-performance anode for electrochemical energy devices.
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ELECTROCHIMICA ACTA
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2022
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IF 7.336
Shuyan Shao,Tao Wen,Ziqun Wang,Xiaoshuang Yin,Ying Liu,Wenzhong Yang,Yun Chen
Electrocatalytic reduction of CO 2 to formate is an extremely attractive route. Here, we developed a SnSe 2 -graphene composite catalyst, and SnSe 2 nanosheets were linked to graphene by Sn-O-C bonds to form complicated hierarchical nanosheet structure. Due to the intrinsic activity of SnSe 2 and the modification of graphene, the catalyst performed excellent electrocatalytic efficacy for the reduction of CO 2 to formate, with a maximum Faraday efficiency up to 95.1% at -0.9 V (vs. RHE) and a current density of 11.8 mA cm −2 under the optimal conditions. Kinetic experiments indicated that the SnSe 2 -graphene composite achieved efficient formate selectivity for CO 2 reduction by increasing the initial transfer rate of electrons to the CO 2 molecule.
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