INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
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IF 7.139
Songyin Yu,Fei Wang,Jianchun Jiang,Xinyi Luo,FeiFei Xing,Taotao He,Junfeng Feng,Xiaoxiang Jiang
The Co catalysts for lipid hydrotreatment into green diesel commonly has a poor dispersion of Co and big Co particle size due to metal agglomeration, limiting its catalytic performance. To solve this problem, three Co catalysts on activated carbon (AC), Al 2 O 3 , and nitrogen-doped carbon (NC) are prepared, among which the Co/NC is synthesized by using the Co metal-organic framework (MOF) as the precursor. In the hydrotreatment of oleic acid , the Co/NC catalyst attained 99.6% conversion and 99.6% alkane yield, much higher than Co/AC (76.8% and 14.9%) and Co/Al 2 O 3 (96.3% and 18.7%). From the characterizations of the catalyst, the excellent performance is ascribed to its lamellar structure , large specific surface area, and high dispersion of Co sites, providing massive Co-active sites for hydrotreatment reaction. Moreover, the catalytic performance of Co/NC under various hydrotreatment temperatures with different feedstocks is investigated.
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Journal of Sustainable Metallurgy
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2022
·Vol. 8
·期 3
·1090-1103
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IF 3.068
Jin Yonglong,Gao Lihua,He Zhijun,Sun Yujia
An economic and effective strategy synchronously utilizing blast furnace bag dust (BF-BD) and converter-removing dust (C-RD) by carbothermic reduction roasting is reported to achieve separation and recovery of iron and zinc. In this paper, the effect of operating parameters on the recovery rate and remove rate of Fe and Zn from BD and GD was initially studied by synergetic carbothermic roasting reduction. The optimized parameters include a reduction temperature pf 1200 °C, a reduction time of 90 min, a FC/O of 2.0, and a proportion of C-RD/BF-BD of 7:3, and the removal efficiency of Zn and metallization degree of Fe reached 98.35% and 90.58%, respectively. The phase transformation and stepwise reduction behavior of wüstite (ZnO) x (FeO) 1− x , spinel Zn x Fe 1− x Al 2 O 4 , olivine Zn x Fe 2− x SiO 4 , and gehlenite Zn z Fe 2− x SiAl 2 O 7 are systematically investigated by SEM–EDS, XRD, TG/DTG, and thermodynamic analyses. It was found that the formation of wüstite (ZnO) x (FeO) 1− x as an intermediates plays an crucial role in the formation of metallic Zn–Fe–C alloy. Phase transformation and reduction mechanisms of C-RD and BF-BD and the interfacial reaction formation mechanism of wüstite (ZnO) x (FeO) 1− x were discussed and clarified in synergistic carbothermic reduction process. Graphical Abstract
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Deyang Yu,Ya’nan Meng,Liangyu Liu,Yunpeng Wu,Xiaoyang Liu
Metal molybdates have attracted considerable attention owing to the development and application of electrochemical energy storage materials and catalysts. However, a long reaction period is normally required during the preparation process of metal molybdates such as classic hydrothermal method . Herein, two groups of dual-cationic metal molybdates, Co x Ni 1−x MoO 4 and Co x Ca 1−x MoO 4 (0≤ x ≤1), were synthesized via a facile and rapid microwave-assisted method. The reaction time was shortened to 30 min via microwave irradiation. The additional redox reactions and increased pore structures induced by extra cation helped the dual-cationic metal molybdates to improve the capacity and extend the cycling span. The optimal electrode in each group was used as the positive electrode, and an active carbon (AC) electrode was used as the negative electrode to assemble the alkaline aqueous battery-supercapacitor hybrid (BSH) device, respectively. The two assembled BSH devices exhibited excellent application prospects and could achieve the highest energy density of 11.1 Wh kg −1 and 8.4 Wh kg −1 , respectively. Apart from promising BSH devices, this research also provides a green and rapid synthesis strategy for fabricating other molybdenum-based materials for exceptional properties.
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Petroleum Science
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2022
·
IF 4.757
Xue-Man Wang,Cheng-Long Wen,Yu Fan
Hierarchical SAPO-11 molecular sieve (ACS-11) was successfully synthesized employing the Al 2 O 3 /carbon (Al 2 O 3 /C) composite obtained through the pyrolysis of Al-based metal-organic framework (Al-MOF-96) as mesoporogen. Unlike other carbon-based mesoporogens with strong hydrophobicity, the Al 2 O 3 /C interacts with phosphoric acid and generates the AlPO 4 /C structure, which promotes the Al 2 O 3 /C dispersion in the synthesis gel of SAPO-11 and avoids the phase separation between them. The Al 2 O 3 /C as mesoporogen decreases the crystallite size of SAPO-11 via preventing the aggregation of SAPO-11 crystals. Additionally, the addition of Al 2 O 3 /C improves the Si distribution in the ACS-11 framework. Consequently, ACS-11 has smaller crystallites, more mesopores, and a greater amount of medium Brønsted acid centers than the conventional microporous SAPO-11 and the SAPO-11 synthesized using activated carbon as mesoporogen. The corresponding Pt/ACS-11 catalyst exhibits the maximal selectivity to multi-branched C 10 isomers (23.28%) and the minimal cracking selectivity (15.83%) in n-decane hydroisomerization among these catalysts. This research provides a new approach for preparing hierarchical silicoaluminophosphate molecular sieve-based catalysts to produce high-quality fuels.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Jiao Shen,Feng Cheng,Yichi Chen,Zeyu Li,Yang Liu,Yue Yuan,Peng Zhou,Wen Liu,Bo Lai,Yongli Zhang
In this study, vanadium trioxide (V 2 O 3 ) was adopted to activate PMS via a Fenton-like reaction to degrade metronidazole (MNZ). The V 2 O 3 -PMS system can almost completely degrade MNZ at 30 min with 42.4% TOC removal. Comparative tests reveal that V 2 O 3 stands out among a variety of heterogeneous catalysts, including metallic oxides and carbon materials. Sulfate radicals (SO 4 •− ) and hydroxyl radicals ( • OH) derived from PMS decomposition are major reactive oxygen species, based on quenching tests, electron spin resonance (ESR) analysis, the steady-state concentrations of radicals ([SO 4 •− ] ss = 5.1 × 10 -13 M and [ • OH] ss = 4.0 × 10 -14 M), and kinetics model. The process of stepwise electron transfer from vanadium species to PMS to produce reactive radicals was proved by small-molecule simulation experiments and pickling experiments of vanadium oxides. Possible pathways of MNZ degradation were proposed based on the results of LC-MS and Fukui function, including two stages of the hydroxylation and bond cleavage of nitro and the subsequent ring-opening. This study reveals the high reusability and practicability of the V 2 O 3 -PMS system over a relatively wide pH range, which puts forward a new vision on V 2 O 3 induced Fenton-like reactions and a new reference method for the removal of medical organic contaminants in water.
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Nature Communications
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2022
·Vol. 13
·期 1
·1-12
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IF 17.694
Song Jianing,Zhang Wenluan,Sun Zhengnan,Pan Mengyao,Tian Feng,Li Xiuhong,Ye Ming,Deng Xu
To fight against global warming, subambient daytime radiative cooling technology provides a promising path to meet sustainable development goals. To achieve subambient daytime radiative cooling, the reflection of most sunlight is the essential prerequisite. However, the desired high solar reflectance is easily dampened by environmental aging, mainly natural soiling and ultraviolet irradiation from sunlight causing yellowish color for most polymers, making the cooling ineffective. We demonstrate a simple strategy to use titanium dioxide nanoparticles, with ultraviolet resistance, forming hierarchical porous morphology via evaporation-driven assembly, which guarantees a balanced anti-soiling and high solar reflectance, rendering anti-aging cooling paint based coatings. We challenge the cooling coatings in an accelerated weathering test against simulated 3 years of natural soiling and simulated 1 year of natural sunshine, and find that the solar reflectance only declined by 0.4% and 0.5% compared with the un-aged ones. We further show over 6 months of aging under real-world conditions with barely no degradation to the cooling performance. Our anti-aging cooling paint is scalable and can be spray coated on desired outdoor architecture and container, presenting durable radiative cooling, promising for real-world applications.
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CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Weikang Zheng,Zongyang Li,Guanjie Lu,Tongxin Yang,Menghong Li,Chaohe Xu,Ronghua Wang
Lithium-ion capacitors (LICs) possess high energy density and power density simultaneously. However, for balancing electrochemical performance, mechanical properties and safety issues, the development of high-performance electrodes and electrolytes is still a challenge in this field. Herein, a 3D nitrogen-doped carbonaceous foam (N C) was synthesized by chemical vapor deposition (CVD), and the covering of poly(vinylidene fluoride- co -hexafluoropropylene) (PVDF-HFP) dramatically increase its flexibility without decreasing the electrochemical performance. The complete quasi-solid-state LICs using N C/PVDF-HFP as anode, N C/activated carbon (AC)/PVDF-HFP as cathode and PVDF-HFP as the skeleton of gel electrolyte are fabricated and shows good cycle stability (72.2 % after 2000 cycles). Meanwhile, the power density of the LIC can reach up to 342.5 W/kg when the energy density is 209.3 Wh/kg, and the power density can reach as high as 7632.2 W/kg at energy density of 77.6 Wh/kg, which is higher than many other dual-carbon and quasi-solid-state LICs.
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CARBON
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2022
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IF 11.307
Yangkai Sun,Dan Xu,Shurong Wang
The rational design of the pore structure of carbon materials is of great significance for solving the low specific capacitance and poor rate performance of supercapacitors . Herein, we propose a multiple heteroatom-doped three-dimensional (3D) interconnected carbon material obtained from the self-assembly of biomass derivatives including chitosan and sodium lignosulfonate with the assistance of boric acid. The amino group of chitosan protonated by boric acid can form electrostatic adsorption and hydrogen bonding with the sulfonic acid group of sodium lignosulfonate to form a carbon network structure. Boric acid also acts as a template, and in combination with KOH activation, further promotes the formation of the hierarchical porous structure , resulting in the as-prepared carbon possessing a high specific surface area of 2700.65 m 2 g −1 . As the electrode material in 6 M KOH electrolyte, it manifests a decent specific capacitance of 332 F g −1 at 1 A g −1 in the three-electrode system, while the symmetric electrode achieves a high energy density of 17.7 W h kg −1 at 166.4 W kg −1 . Moreover, the contribution rate of the fast and slow kinetic process, as well as the fast diffusion of electrolyte ions are deeply revealed through the ultrafast charge/discharge and the ion diffusion kinetics analysis , respectively. The symmetric electrode in PVA/KOH gel electrolyte maintains 97% capacitance retention and 100% Coulombic efficiency over 10000 cycles, indicating excellent cycling stability.
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CORROSION SCIENCE
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2022
·
IF 7.72
Zihao Wen,Zhongyu Tang,Hong Meng,Yanhui Chu
(Hf 0.25 Zr 0.25 Nb 0.25 Ti 0.25 )(C 0.5 O 0.5 ) high-entropy oxycarbides (HECO-1) with good oxidation resistance, as a promising new class of high-entropy ceramics, were synthesized by a facile carbothermic reduction method for the first time. The results showed that the as-synthesized HECO-1 samples had the single-phase rock-salt structure and high compositional uniformity. Compared to the as-synthesized (Hf 0.25 Zr 0.25 Nb 0.25 Ti 0.25 )C high-entropy carbides , the as-synthesized HECO-1 samples possessed the higher initial oxidation temperature and slower oxidation rate to show the better oxidation resistance , making them the promising applications in extreme environments, which was attributed to their higher oxidation activation energy and Gibbs free energy of oxidation reaction.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Wei Guo,Tao Yang,Lianjie Huang,Shuang Wang,Jinping Li
In this study, a MnNiO 3 /Ni 6 MnO 8 composite is synthesized under the hydrothermal condition of 120–160 ℃ through different growth time. The three-dimensional (3D) flower-like MnNiO 3 /Ni 6 MnO 8 nanospheres are successfully obtained under the reaction condition of 140 ℃ for 10 h. The unique 3D spherical structure of MnNiO 3 /Ni 6 MnO 8 with mesopores can facilitate the transport of electrolyte ions and generate more redox active sites. The specific capacity of MnNiO 3 /Ni 6 MnO 8 can reach 70.6 mAh/g at 1 A/g, and reserve 70.1% even at 10 A/g. What's more, the MnNiO 3 /Ni 6 MnO 8 composite displays excellent cycling stability that the capacity has almost no degradation after 6000 cycles at 3 A/g. In addition, the energy storage mechanism of MnNiO 3 /Ni 6 MnO 8 is also studied and the results show that it is a battery type electrode material dominated by diffusion-controlled process . Moreover, the as-prepared MnNiO 3 /Ni 6 MnO 8 nanospheres are further used to assemble a hybrid device. The device can provide a specific energy of 22.3 Wh/kg at a specific power of 1074.7 W/kg. The specific capacity of 122% is kept after 10000 cycles at 8 A/g, revealing its superior cycling stability. As expected, the commercial LEDs with different colors can be lit up by MnNiO 3 /Ni 6 MnO 8 //AC device, indicating that the as-prepared MnNiO 3 /Ni 6 MnO 8 electrode has good application potential.
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MACROMOLECULAR BIOSCIENCE
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2022
·Vol. 22
·期 9
·2200179
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IF 5.859
Meng Wang,Jianping Zhao,Yixuan Luo,Qianyi Liang,Yisi Liu,Gang Zhong,Yin Yu,Fei Chen
Bioprinting is an emerging technology for fabricating cell-laden scaffolds with custom shapes that resemble the complex architecture of human tissues, however, construction of mechanically competent tissue grafts which mimic irregular cartilage defect is still a big challenge. Here, 3D printing of short fiber-reinforced double-network bioink to generate anatomically accurate and mechanical tunable scaffold for cartilage regeneration is reported. Poly(lactic acid) (PLLA) short fibers are first prepared by electrospinning and then fragmented through aminolysis reaction. Composite inks are constructed with an incorporation of fragmented microfibers with varied amounts and lengths into oxidized alginate bioink. The results show that incorporation of PLLA short fibers not only improves the printing fidelity but also facilitates in generating mechanically strong constructs. By incorporating gelatin methacryloyl (GelMA) and optimizing the bioink composition, the fabricated constructs with a compressive stress of ≈150 kPa even after 100 cyclical compression loading (up to 40% of strain) are achieved. In addition, this mechanically reinforced alginate/GelMA double-network bioink displays good biocompatibility and supports bone marrow-derived stromal cell chondrogenesis in vitro. Collectively, these findings demonstrate this approach is capable of printing engineered grafts which resemble the irregular size and mechanical properties of cartilage and thus hold potential for functional tissue regeneration.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Yuan Chen,Hao Guo,Fan Yang,Ning Wu,Junye Zhang,Liping Peng,Bingqing Liu,Zhilan Pan,Wu Yang
A metal porous carbon (Ni@NC) supported nickel/cobalt layered double hydroxide (NiCo-LDH) (Ni@NC@NiCo-LDH) with a cauliflower morphology was synthesized by a successive double template method . At first a nickel metal-organic framework (Ni-MOF) was prepared and used as a sacrifice template to produce metal porous carbon (Ni@NC). Then the prepared conductive porous carbon material was exploited as a substrate for in-situ growing of ZIF-67 on its surface. Lastly the obtained Ni@NC@ZIF-67 was further used as a sacrifice template to prepare the final electrode material Ni@NC@NiCo-LDH by Ni 2+ etching and co-precipitation. The cooperation of Ni@NC with excellent conductivity and NiCo-LDH with superior pseudocapacitive property yielded a synergistic effect , which effectively improved the electrochemical performance of the resulted electrode material. And the special flower morphology exposed more redox active sites and provided proper charge transport path for enhanced electrochemical performance. The prepared Ni@NC@NiCo-LDH exhibited a high specific capacitance of 1761.8 F·g −1 at the current density of 1 A·g −1 . The assembled Ni@NC@NiCo-LDH//AC asymmetric supercapacitor also displayed an acceptable energy density (39.27 Wh·kg −1 at the power density of 757.21 W·kg −1 ) and ultrahigh cycling stability (94.74% capacitance retention after 25000 cycles at 10 A g −1 ).
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