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Boron-doped rice husk-derived c/SiOx composites as high-property anode for Li-ion batteries

IONIcS 2022年第9期28卷 4159-4167页

作者： Zhang, Haibang Yang, Zexu Zhang, Ning Qiao, Kaiyuan Liu, Yunying He, Wenxiu cui, Jinlong Sun, Juncai Dalian Maritime Univ Inst Mat & Technol Linghai Rd 1 Dalian 116026 Peoples R China Inner Mongolia Univ Sci & Technol Aerogel Funct Nanomat Lab Aerding Rd 7 Kundulun Dist 014010 Baotou Peoples R China

For conversion of renewable biomass, boron (B)-doped porous c/SiOx composites (B@c/SiOx) were prepared from rice husks and H3BO3 via a simple annealing process. The introduction of B induces the extrinsic defects and additional active sites, tunes the chemistry of carbon skeleton, and improves electrochemical performance of composites. The B-doped c skeleton substantially relieves volume change of SiOx and enhances the electronic conductivity of composites. The unique porous structure, large specific surface area, and B-doping endow B@c/SiOx with the high cycling capacity, excellent rate property, and exceptional cycling stability. Moreover, B doping can significantly decrease the Li+ migration barrier in c matrix of c/SiOx. When applied as Li-ion batteries anode, the optimized electrode harvests a cycling capacity of 1040 mAh g(-1) under 0.1 A g(-1) after 100 cycles with an elevated initial coulombic efficiency (cE) of 70.2%, and long cycle life up to 1000 cycles with a capacity of 610 mAh g(-1) under 1.0 A g(-1). This research sheds light on the thoughts of biomass-derived materials for sustainable energy storage devices.

关键词： c SiOx composites B-doped Rice husks High-property Anodes

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Brazing of c/c composite and TiAl Alloy Using TiNiSi Filler Metal Added cu Interlayer

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JOURNAL OF MATERIALS ENGINEERING AND PERFORMANcE 2022年第2期31卷 1277-1284页

作者： Li, Shengnan Du, Dong Jiu, Yongtao Qin, Jian Liu, Quanming Long, Weimin Tsinghua Univ Dept Mech Engn Beijing 100084 Peoples R China Zhengzhou Res Inst Mech Engn Co Ltd State Key Lab Adv Brazing Filler Met & Technol Zhengzhou 450001 Peoples R China China Innovat Acad Intelligent Equipment Ningbo C Ningbo 315700 Peoples R China

A novel Ti-Ni-Si brazing filler metal was designed and fabricated to braze the c/c composite and c/c composite, and c/c composite and TiAl intermetallic alloy at 1060 degrees c for 10 min. The interfacial microstructures and mechanical properties were investigated, and the enhancing mechanism of the joint strength was elucidated. The results showed that a perfect interface joint was achieved by using TiNiSi to braze the c/c composite. Ductile Ti3Sic2 carbide was formed at the interface, which is beneficial to the joint bonding effect. The direct joining between the c/c composite and TiAl alloy using TiNiSi filler metal was unsuccessful, which was attributed to the high content of intermetallic compounds and hard-brittle phases in the brazed joint. The addition of a cu interlayer to the joint can adjust the interfacial structure and reduce the content of brittle compounds, leading to a complete connection between the c/c composite and TiAl alloy. The interfacial transition layer on the c/c composite side mainly consisted of Ti3Sic2, Ti3Alc ductile ceramic phases, and Tic phase, which enhanced the performance of the brazed joint. The average shear strength at room temperature was 18.8 MPa, with the maximum value of 23.6 MPa, and the average shear strength at 600 degrees c was 25.8 MPa.

关键词： c c composite interlayer TiAl intermetallic compound Ti3Sic2 ductile ceramic phase

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High- Speed Tensile Deformation Behavior of a Metastable 18cr-6Ni-0.2N-0.1c Steel

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ISIJ INTERNATIONAL 2022年第10期62卷 2054-2060页

作者： Oe, Masashi Tsuchida, Noriyuki Ishimaru, Eiichiro Kawa, Masatomo Univ Hyogo 2167 Shosha Himeji Hyogo 6712280 Japan Univ Hyogo Grad Sch Engn 2167 Shosha Himeji Hyogo 6712280 Japan Nippon Steel Stainless Steel Corp Res & Dev Ctr 3434 Shimata Hikari 7438550 Japan

The present study investigated the high-speed deformation behavior of 6Ni-0.2N-0.1c steel. 0.2% proof stress (0.2% PS) of the 6Ni-0.2N-0.1c steel increased with an increase in strain rate ((epsilon) over dot) but tensile strength (TS) indicated almost the same value at (epsilon) over dot above 10(-1) s(-1). Uniform elongation (***) largely decreased with an increase in (epsilon) over dot. TS and *** of the 6Ni-0.2N-0.1c steel at 103 s(-1) were almost the same as those of SUS304 steel. When the effect of (epsilon) over dot on mechanical properties was compared between the 6Ni-0.2N-0.1c and SUS304 steels, the strain rate dependence on 0.2% PS was larger in the 6Ni-0.2N-0.1c steel and that on TS was different at (epsilon) over dot above 10(0) s(-1). And the decrease of *** with an increase in (epsilon) over dot was larger in the 6Ni-0.2N-0.1c steel. The decrease of *** at 10(3) s(-1) was discussed from the viewpoint of change of flow stress at the maximum load point with an increase in (epsilon) over dot. The estimated results proposed that austenite phase hardly transformed into deformation-induced martensite (alpha') up to the maximum load point at 10(3) s(-1) in the 6Ni-0.2N-0.1c steel. The tensile properties of the 6Ni-0.2N-0.1c steel are largely influenced by the higher strength of alpha'. It is difficult for the 6Ni-0.2N-0.1c steel to produce TRIP effect at high strain rates because the deformation-induced martensitic transformation is suppressed.

关键词： TRIP metastable austenitic stainless steel N c high speed deformation strain rate

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constructing sandwich structure of Nb-substituted Na3V2(PO4)3/c nanoparticles enwrapped on three-dimensional graphene with superior sodium storage property

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cERAMIcS INTERNATIONAL 2022年第22期48卷 33957-33966页

作者： chen, Bifen Peng, Zhenbo Yuan, Zhengyong Ningbo Polytech Chem Engn Coll Ningbo 315800 Peoples R China

Poor intrinsic conductivity has been a principal limiting factor for Na3V2(PO4)3 (NVP) cathode material. Herein, a synergistic strategy of Nb5+ substitution and constructing with three-dimensional rGO lamella is proposed for the first time to optimize the characteristics of NVP. The introduction of Nb5+ generates beneficial carriers and vacancies that optimize the electronic structure of NVP system. Meanwhile, rGO substrate can construct an effective conductive network for the facilitated electronic transportation and form a stabilized SEI layer after cycling to protect the active particles from being collapsed. This double treatment significantly improves the kinetic characteristics of NVP. Moreover, theoretical calculations indicate that beneficial Nb5+ doping can effectively reduce the band gap between conductive and valence bands, as well as decline the energy barrier of migration for Na+. Notably, the modified Nb0.15-NVP/c@rGO exhibits impressive electrochemical performance. It delivers a capacity of 107.9 mAh g-1 and keeps a value of 102.6 mAh g-1 after 500 cycles at 2c with a high retention of 95.35%. It submits a capacity value of 97.2 mAh g-1 at 20c, 82.92% reversible capacity (80.6 mAh g-1) could be retained after 2000 cycles. Even at 120 and 300c, this material still performs high values of 84.9 and 71.3 mAh g-1, indicating the superior rate capability.

关键词： Sandwich structure Nb-doped c Graphene Sodium storage property

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Modeling and experimental study on electrical impedance response to damage accumulation in 2D c/Sic composites

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JOURNAL OF THE EUROPEAN cERAMIc SOcIETY 2022年第10期42卷 4144-4153页

作者： Huo, Yanyan Yang, Qiang chen, Sian Meng, Songhe Zhao, Jingyu Jiang, Jieyu Harbin Inst Technol Natl Key Lab Sci & Technol Natl Def Adv Composites Harbin 150001 Peoples R China Harbin Inst Technol Postdoctoral Res Ctr Mat Sci & Technol Harbin 150001 Peoples R China Natl Univ Def Technol Sci & Technol Adv Ceram Fibers & Composites Lab Changsha 410073 Peoples R China

The electrical properties of c/Sic composites could be used for online and in-situ damage monitoring. To investigate alternating current (Ac) impedance response to damage in the c/Sic composites, monotonic and incremental cyclic tensile tests were performed. Both Ac impedance and acoustic emission (AE) techniques were applied to clarify the damage evolution during the tests. The relationship between damage and electrical impedance response was investigated and validated via macroscopic equivalent circuit models. The effects of longitudinal deformation and damage on Ac impedance characteristics, including impedance magnitude and phase angle, were obtained from the models. Results showed that the longitudinal deformation increases the impedance magnitude and the phase angle, and the damage causes the impedance magnitude to increase and the phase angle to decrease. The phase angle is significantly sensitive to fiber breakage, which makes the Ac-based method more suitable for online damage monitoring and final failure warning.

关键词： c Sic composites Electrical impedance Damage monitoring Macroscopic equivalent circuit model

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Low residual stress c/c composite-titanium alloy joints brazed by foam interlayer

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cERAMIcS INTERNATIONAL 2022年第4期48卷 5260-5266页

作者： Guo, Wei Li, Kui Zhang, Hongqiang Zhu, Ying Shen, Xiaoyu Zhang, Lei Sun, Huawei Zhong, Sujuan Long, Weimin Beihang Univ Sch Mech Engn & Automat Beijing 100191 Peoples R China AECC Hunan Aviat Powerplant Res Inst Zhuzhou 412002 Peoples R China China Acad Space Technol Beijing 100081 Peoples R China Zhengzhou Res Inst Mech Engn State Key Lab Adv Brazing Filler Met & Technol Zhengzhou 450001 Peoples R China China Innovat Acad Intelligent Equipment Ningbo C Ningbo 315700 Peoples R China

Metallic foam was introduced as an interlayer to improve the performance of the brazed c/c composite-titanium alloy joint, and the interfacial microstructure and residual stress of the brazed joint were investigated. compared with the brazed joint without foam, introducing foam interlayer could achieve the uniform bonding interface, and Ag-based solid solution (Ag(s,s)) became more dispersed and smaller in the center of the brazing seam. The thickness of reaction layer close to c/c composite side was less than 1 mu m. Some cu-based solid solution (cu(s,s)) was detected, indicating that cu foam still existed after brazing. The residual stress and its distribution calculated by finite element method (FEM), and the residual stress of the brazed joint decreased from 293 MPa to 228 MPa. The introduction of the foam interlayer could obtain homogeneous microstructure, change stress distribution, and improve mechanical properties of the brazed joints.

关键词： Brazing Residual stress Foam interlayer c c composite Titanium alloy

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Effects of the c/N ratio on the microbial community and lignocellulose degradation, during branch waste composting

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BIOPROcESS AND BIOSYSTEMS ENGINEERING 2022年第7期45卷 1163-1174页

作者： Xie, Yuqing Zhou, Liuyan Dai, Jinping chen, Jing Yang, Xinping Wang, Xiaowu Wang, Zhifang Feng, Lei Xinjiang Acad Agr Sci Inst Microbiol Applicat Urumqi 830000 Peoples R China Xinjiang Key Lab Special Environm Microbiol Urumqi 830000 Peoples R China

Aerobic composting is an efficient and environmentally friendly method of converting organic waste into nontoxic fertilizers or soil quality enhancers. The quality of the resultant compost depends greatly upon the composition of the substrate used. The initial carbon-to-nitrogen (c/N) ratio of the substrate is an important factor affecting the composting process. This study elucidated how initial c/N ratios affect the biodegradation of lignocellulose, due to changes in microbial community structure. Four different c/N ratios (20:1, 25:1, 30:1, and 35:1) were examined during a 35-day composting process. The degradation of cellulose, hemicellulose, and lignin was highest (35.7%, 30.6%, and 19.1% respectively) at a 30:1 c/N ratio;after 30 days, the 25:1 c/N ratio ranked second in terms of lignocellulosic degradation rate. The 30:1 c/N ratio further promoted the growth of functional microorganisms responsible for lignocellulose degradation (Luteimonas, Sphingobium, Trichoderma, chaetomium, and Rosellinia), while the growth of dominant pathogenic microbes (Erwinia and Ulocladium) decreased significantly. These results confirm that the initial c/N ratio of the substrate has a significant effect on the microbial community and degradation of organic matter, during walnut branch composting. This process could therefore offer an alternative means of efficient recycling and recovery of waste branches.

关键词： composting Lignocellulose degradation c N ratio carbon emissions Microbial community

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A chromium carbide coating in-situ formed on c/c composites by the novel reactive wetting strategy to enhance oxidation resistance

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JOURNAL OF THE EUROPEAN cERAMIc SOcIETY 2022年第14期42卷 6435-6444页

作者： Guo, Xiajun Si, Xiaoqing Liu, Yongxu Zhao, Wendi Wang, Xiaoyang Li, chun Qi, Junlei cao, Jian Harbin Inst Technol State Key Lab Adv Welding & Joining Harbin 150001 Peoples R China

A chromium carbide (cr-c) coating in-situ formed on the c/c substrate is successfully prepared by a novel reactive wetting strategy. The interfacial microstructure and oxidation resistance of coated c/c composites are investigated in detail. The as-prepared coating mainly consists of cr23c6 and cr7c3, forming a tight joining with the c/c substrate. compared to uncoated samples, the oxidation weight loss of coated c/c composites is sub-stantially reduced at high temperatures. Furthermore, the hardness of coated c/c composites is significantly increased, enhancing their ability to resist external damage. This reactive wetting strategy can also be used to prepare uniform coatings on c/c composites with complex grooved structure or large size. Surprisingly, coated c/c composites possess a low weight gain of 3.7% due to thin coating (< 10 mu m), which can maintain their advantage of low density.

关键词： c c composites chromium carbide coating Oxidation resistance cr2O3

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Alteration in Wnt signaling mediates induction of transgenerational toxicity of polystyrene nanoplastics in c. elegans

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NANOIMPAcT 2022年 28卷 100425页

作者： Xu, Ruoran Hua, Xin Rui, Qi Wang, Dayong Nanjing Agr Univ Coll Life Sci Nanjing 210095 Peoples R China Southeast Univ Med Sch Nanjing 210009 Peoples R China

Polystyrene nanoparticles (PS-NPs) have a potential toxicity on offspring after the exposure. However, the molecular basis for PS-NP in inducing transgenerational toxicity remains largely unknown. In this study, the role and the underlying mechanism of germline Wnt signaling in regulating transgenerational toxicity of PS-NPs were determined using an in vivo animal model of caenorhabditis elegans. Exposure to PS-NP (1-100 mu g/L) increased expression of Wnt ligand LIN-44 and decreased expression of Wnt receptor MIG-1. After the exposure, the transgenerational PS-NP toxicity on locomotion behavior and brood size were inhibited in lin-44(RNAi) nematodes, while enhanced in mig-1(RNAi) nematodes. The resistance to transgenerational PS-NP toxicity induced by RNAi of lin-44 in P0 generation (P0-G) was inhibited by RNAi of mig-1 in F1-G. In addition, after PS-NP exposure, germline RNAi of lin-44 at P0-G could increase the mig-1 expression in F1-G. Exposure to PS-NP (1-100 mu g/L) further decreased expressions of Dishevelled proteins of DSH-1/2, increased APc complex component APR-1, and decreased expression of BAR-1/beta-catenin. Meanwhile, transgenerational PS-NP toxicity was enhanced by RNAi of dsh-1, dsh-2, or bar-1 and inhibited by RNAi of apr-1, suggesting that the DSH-1/2-APR-1-BAR-1 signaling cascade acted downstream of Wnt receptor MIG-1 to control transgenerational PS-NP toxicity. Moreover, BAR-1 acted upstream of DVE-1 to activate mitochondrial unfolded protein response (mt UPR) against the transgenerational PS-NP toxicity. Our data highlights the potential link between alteration in germline Wnt signaling and induction of transgenerational nanoplastic toxicity in organisms.

关键词： Wnt Polystyrene nanoparticle Transgenerational toxicity c elegans

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One-dimensional recoverable ZnFe2O4/c/MnO2/BiOI magnetic composite with enhanced photocatalytic performance for organic dyes degradation

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ENVIRONMENTAL ScIENcE AND POLLUTION RESEARcH 2022年第42期29卷 63233-63247页

作者： Ma, Mingliang chen, Yan Jiang, Jiabin Bi, Yuxin Liao, Zijian Ma, Yong Qingdao Univ Technol Sch Civil Engn Qingdao 266033 Peoples R China Shandong Univ Sci & Technol Sch Mat Sci & Engn Qingdao 266590 Peoples R China

Excessive discharge of toxic dyes is detrimental to ecological system and human health. Therefore, an effective photocatalyst must be designed and developed to degrade dyes from wastewater. Herein, a novel one-dimensional (1D) flower-like recoverable ZnFe2O4/c/MnO2/BiOI magnetic composite photocatalyst was synthesized via electrospinning technique combined with hydrothermal method. The photocatalytic activities of composite photocatalyst were evaluated by degrading methyl orange (MO) and Rhodamine B (RhB) under simulated light irradiation. The efficiency of ZnFe2O4/c/MnO2/BiOI photocatalyst in visible light for 150 min reached 91% (MO) and 120 min reached 94% (RhB). Moreover, the degradation rate of MO still remained 78% after five cycles. The design of 1D magnetic flower-like composite provided a new strategy for preparing photocatalysts possessing excellent photocatalytic efficiency and cyclic stability.

关键词： ZnFe2O4 c MnO2 BiOI Magnetic composite photocatalyst 1D structure Flower-like cyclic stability

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