DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 31
·11909-11915
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IF 4.569
Siyu Chen,Yanan Xu,Hongbin Du
SiOx is one of the most promising anode materials for lithium-ion batteries (LIBs), due to its high theoretical capacity and low cost. However, the huge volume expansion and low electron/ion diffusion rate hinder its further commercial applications. Herein, a simple molecular polymerization method is developed to synthesize N,P co-doped SiOx–C composites (denoted as SiOx–C@CNT), in which SiOx and carbon are uniformly dispersed at the atomic level, and the embedded carbon nanotubes improve the lithium ion diffusion kinetics. Benefiting from the unique structure, the SiOx–C@CNT composites exhibit a high reversible capacity of 848 mA h g−1 at 0.1 A g−1 and long cycling stability (84.0% capacity retention after 1500 cycles). More impressively, the LiCoO2∥SiOx–C@CNT full battery also exhibits stable cycle life (only 4.7% capacity loss after 300 cycles at 1 C). These results show the application potential of the SiOx–C@CNT anode in LIBs.
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Nano Energy
·
2021
·
IF 17.881
Zhenyu Xu,Fenghua Zhou,Huizhen Yan,Guorong Gao,Huijing Li,Rui Li,Tao Chen
Human-machine interaction is crucial for mobile communications, Internet of Things , intelligent medical care, and intelligent robots. There is an increasing interest to develop the next generation of flexible human-machine interactive devices based on stretchable ionic conductive polymer gels . However, due to the nature of polymer gels, the devices turn brittle and the ionic conductivity dramatically drops at subzero temperatures, thus restricted their applicable temperature range. Herein, anti-freezing organohydrogels consist of polyacrylamides/nano-clays networks absorbed with ethylene glycol (EG)/water were designed. The anti-freezing binary solution provides excellent properties for organohydrogels at − 30 °C, including tensile modulus of 29.2 kPa, an ultimate tensile strain of 700%, the ionic conductivity of 1.5 × 10 −3 S m −1 , transparency of 91%, and rapid self-healing. The flexible organohydrogels electrodes were assembled with elastomers to prepare triboelectric nanogenerators (TENGs), which were further attached on fingers to develop human-machine interactive keyboards. The voltage signals produced by the keyboards in contact with many surfaces were collected, coded, and interpreted as letters and punctuations, then displayed on a monitor. We demonstrated typing by using the self-powered flexible keyboard at − 30 °C. This work may benefit the development of anti-freezing soft materials, self-powered sensors, and wearable human-machine interaction communication device systems.
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Nano Research
·
2021
·Vol. 15
·期 3
·1949-1958
·
IF 8.897
Zhao Chen,Guo Shien,Li Qi,Liu Jianan,Zheng Mang,Xiao Xudong,Jiang Baojiang,Fu Honggang
Fenton or photocatalytic degradations of organic contaminants are recognized as promising approaches to address the increasing environmental pollution issues. Herein, we develop the effective synergistic catalysis reaction of Fenton and photocatalysis based on a loofah sponge-like Fe 2 O x /C nanocomposite, which exhibits excellent nitrobenzene photocatalytic degradation property. It is noted that Fe 2 O 3 nanoparticles with surface Fe 2+ species were encapsulated with an ultrathin carbon layer (denoted as Fe 2 O x /C) via a supramolecular self-sacrificing template and following thermal treatment process. The experimental results indicated that the thin layer carbon coating not only inhibited the Fe iron leaching from the Fe 2 O x but also prompted the separation and transferring of electrons-hole pairs. The introduction of Fe 2 O x /C enables the Fenton reaction to induce a rapid Fe 2+ /Fe 3+ cycle, and meanwhile, together with the photocatalytic reaction to produce continuous active substances for the subsequent degradation catalytic reaction without successive H 2 O 2 , resulting in the inexpensive and the effective photocatalytic procedure. As a result, 100% nitrobenzene (100 mg/L) was degraded and 97% of the organic carbon was mineralized in 90 min using the Fe 2 O x /C (0.1 g/L) at a low H 2 O 2 dosage (0.50 mM), under air mass (AM) 1.5 irradiation. Theoretical calculations confirmed that the Fe 2 O x /C-600 with thin carbon layer promoted the dissociation of H 2 O 2 and the ·OH desorption. The synergistic catalysis of this work may provide new ideas for low-cost and more efficient treatment of pollutants.
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CHEMICAL ENGINEERING SCIENCE
·
2021
·
IF 4.311
Cunyin Zhang,Leibin Guo,Chengwei Deng,Haili Huang,Yuanhui Cheng
Aqueous zinc-based flow battery has advantages of low cost, high safety and abundant reservoir, showing a good application prospect. However, zinc dendrites remain a big issue to their cycling stability. Herein, we construct a multi-structured semi-solid anode by packaging multi-layered graphite felt and zinc slurry based on microporous carbon wrapped nano-ZnO ( [email protected] ). [email protected] is prepared by polymerizing dopamine on nano-ZnO and followed calcination . Microporous carbon shells act as restriction spaces, forbidding either oxidized or reduced zinc species flow out, but also serve as the first electron network. Meanwhile, carbon black and graphite felt function as the second and third electron networks. Besides, trace alkaline solutions deliver hydroxyl ions. Thus, the redox of zinc species proceeds in microporous carbon shells without zinc dendrites. Resultantly, semi-solid anode has high electrochemical activity and stability in zinc-iron flow batteries. The average efficiency is 74.8％ with negligible fluctuations over 840 h (460 cycles).
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Peng Zhang,Cheng Peng,Hui Li,Jing Huang,Yan Wang,Youqing Yu,Shimin Ding,Songli Liu,Yanchun Zhao
Reactive species, such as hydroxyl radicals (·OH), holes (h + ) and superoxide radicals (·O 2 − ), are considered as the main active substances involved in the photocatalytic degradation of organic pollutants. However, to the best of our knowledge, the effect of the photon energy on the generation of these species has never been examined in detail. In this study, the photocatalytic production of ·OH, h + and ·O 2 − over niobium pentoxide (Nb 2 O 5 ) was investigated as a function of the excitation wavelength. The ESR results clearly show that all three active species can be generated at 355 nm for both pure and C-doped Nb 2 O 5 . At 532 nm, which is well beyond the absorption edge of Nb 2 O 5 (399 nm), only h + and •O 2 − are produced over pure Nb 2 O 5 , while at the same time all three species can be produced over C-doped Nb 2 O 5 . The results of the trapping experiments indicate that •O 2 − and h + are the main reactive species that are responsible for the photocatalytic degradation. The photogenerated holes play a crucial role in the wavelength range of 365–420 nm but become less active with increasing wavelength. •O 2 − shows little dependence on wavelength and is consistently active at all wavelengths between 365 and 630 nm, in particular, for C-doped Nb 2 O 5 . It is concluded that the presence of localized states within the forbidden gap has a profound impact on the photocatalytic activity in the visible-wavelength region.
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MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Yuxuan Qin,Chen Hang,Liping Huang,Haiyun Cheng,Junqing Hu,Wenyao Li,Jianghong Wu
In this study, Sn@C composite was fabricated from ZnSn(OH) 6 through a green thermal calcination method. For the first time, this composite was used as a modifier on glassy carbon electrode (GCE) to construct an electrochemical biosensor to detect acetaminophen (AC). The Sn@C sensor exhibited distinctly enhanced performance in electrochemical response to AC compared with bare GCE, GCE modified with Sn and GCE modified with graphene. The linear range is 0.2–100 μM and the limit of detection (LOD) is 0.020 μM based on DPV analysis. The excellent electrochemical behavior can be ascribed to the outstanding conductivity of metal Sn and carbon, and the strong adsorption of the carbon layer to AC. Most importantly, the chemical interaction between Sn and C through Sn-C bond facilitated the electron transfer process in the electrooxidation of AC. Finally, the Sn@C sensor was successfully applied in pharmaceutical samples and spiked serum samples to detect AC with satisfactory recoveries.
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Journal of Materials Chemistry A
·
2021
·Vol. 10
·期 3
·1547-1559
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IF 12.732
Ran Liu,Gaiping Du,Bin Liao,Weixin Xiao,Zhenguo An,Jingjie Zhang
Due to their multiple dissipation mechanisms, low density and easily tailored impedance matching, heterogeneous hollow structures are promising candidates for microwave absorbents towards wideband absorption and lightweight design. In this work, a new type of hollow microspheres with a porous carbon shell embedded with crystalline FeCo alloy nanoparticles have been prepared via a stepwise spray drying–calcination strategy. The effects of both the FeCo/C molar ratio and the calcination temperature on the structure and property of the porous hollow microspheres (PHMs) have been studied. It is found that the effective absorption bandwidth of the as-prepared FeCo/C PHMs surpassed 7.44 GHz at a matching thickness of 2.64 mm, which covers the full Ku-band. Moreover, with an elevated calcination temperature, high microwave absorbing performance can be achieved at a much reduced matching thickness. A probable absorbing mechanism has been proposed involving the synergistic effect of the hollow interior, the porous shell structure, and the electric and magnetic dissipation due to the coexistence of carbon and magnetic metals. This work opens a new pathway to synthesize microwave absorbents with a heterogeneous hollow structure, and may shed some light on the design and controlled preparation of other hollow structures with various shell compositions.
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JOURNAL OF HAZARDOUS MATERIALS
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2021
·
IF 10.588
Huiwang Dai,Wenjun Zhou,Wei Wang,Zhiqi Liu
In this study, three Co/N-C catalysts were prepared by pyrolysis of bimetallic zeolitic imidazole frameworks with different Co/Zn ratio, and the critical active Co species in peroxymonosulfate (PMS) activation was investigated. The three catalysts had distinct cobalt species but similar N configuration and graphitization degree. The Co species were distributed as single atoms (Co SAs) at a Co/Zn molar ratio of 1:8, while Co nanoclusters (Co NCs) and Co nanoparticles (NPs) would be formed with further increase in Co content. The degradation efficiency of BPA did not show correlation with the increasing of Co content in catalyst. Based on the catalytic performance comparison and reactive species detection, Co SAs was identified as active sites, which could interact with PMS to generate 1 O 2 via path of PMS→HOO*→O*→ 1 O 2 . However, the role of NCs and NPs in directly activating PMS was negligible. In addition, the increase of Co content in Co/N-C catalyst would result in mass cobalt leaching, which enhanced the BPA degradation via homogeneous catalytic reactions with Co IV as reactive species. It is an effective way to design the Co/N-C catalyst with high catalytic activity and stability via regulating the formation of Co SAs.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yongxin Qian,Yang Tao,Wang Li,You Li,Tian Xu,Jinian Hao,Qinghui Jiang,Yubo Luo,Junyou Yang
Electronic packaging materials with efficient heat dissipation and anti-electromagnetic-interference performance are highly desirable to realize the long-term stable operation of highly integrated electronic devices. Such combined functions of heat dissipation and anti-electromagnetic-interference are achieved here by filling 3D CNF@C-Ni network skeleton in epoxy resins (EP). The CNF@C-Ni is a carbon nanofibers network skeleton embedded with micron flower-like C-Ni particles and has been obtained by carbonizing nickel metal–organic frameworks (Ni-MOF) embellished bacterial cellulose. The 3D CNF@C-Ni network skeleton provides a highly efficient heat transfer channel for EP, rendering a high thermal conductivity of 0.5 W·m −1 K −1 at room temperature for the 5 wt% CNF@C-Ni filled EP, ~2.8 times higher than that of pristine EP. In addition, the flower-like C-Ni particles realize an optimization in the impedance matching of CNF@C-Ni/EP, enabling a high electromagnetic wave absorption performance in the wave-transparent epoxy resins. In particular, a lowest reflection loss value of −49.77 dB at 13.44 GHz with a maximum effective bandwidth of 5.44 GHz (from 12.08 to 17.52 GHz) has been achieved in the 5 wt% CNF@C-Ni filled epoxy resins with a thickness of 2.2 mm. Such a new dual-functionated epoxy resin with combined high electromagnetic wave absorption and thermal management performance shows great potential in manufacturing of highly integrated electronic devices.
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Journal of Functional Foods
·
2021
·
IF 4.451
Huan Liu,Xinyu Meng,Lei Li,Xueyi Hu,Yun Fang,Yongmei Xia
Vitamin C has often been applied in capsule due to its sensitivity to oxygen, and it is only stable at acidic conditions; although most encapsulation of vitamin C has been carried out in neutral environment. Herein, hybrid fatty acid vesicles were constructed from conjugated linoleic acid (CLA) and saturated fatty acids (SFA) to encapsulate vitamin C in aid of sodium dodecyl sulfate under acidic conditions, with significantly improved encapsulation efficiency and sustain release of VC. The CLA-SFA and the encapsulated VC synergistically presented dramatic higher antioxidant activity in positive relation with chain length of the SFA. The possible mechanism that the SFA improved encapsulation was proposed. The SFA made larger and thicker vesicles, and the enhancement was in positive relation with chain length of the SFA, although SFA slightly broadened the vesiculation pH windows towards alkaline direction. Meanwhile, the prepared hybrid fatty acid vesicles presented good stability at room temperature.
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Inorganic Chemistry Frontiers
·
2021
·Vol. 8
·期 17
·3998-4005
·
IF 6.569
Weiwei Liu,Meng Xu,Menghua Zhu
Maximum energy storage in minimum charging time is increasingly important to evaluate the performance of lithium ion batteries (LIBs). High rate electrode materials require high ion and electron transport ability. Niobium tungsten oxides as emerging materials are employed as anodes for LIBs and show desirable rate performance owing to their high Li+ diffusion coefficients. However, most studies focus on the preparation and performance of niobium tungsten oxides at the nanoscale while electrode materials in micro grade result in high tap density and smaller electrode thickness with a shorter electron pathway under the same mass loading. Herein, Nb18W16O93/C spheres in micro grade with a carbon layer coating on Nb18W16O93 nanograins are synthesized via a facile solvothermal method. Owing to the enhanced electronic conductivity and protection of structural integrity by the carbon layer, the Nb18W16O93/C anode exhibits excellent rate performance with 182.8 mA h g−1 at a high rate of 5C with a capacity retention of 81% (based on 225.7 mA h g−1 at 0.2C). In addition, superior cycling stability is shown with a capacity retention of 85.6% at 1C after 100 cycles and 68% at 5C after 300 cycles. This stable anode material with advanced rate capability shows huge competitiveness as a candidate for fast charging materials of LIBs.
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CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2021
·
IF 1.134
Qiu-Mei FENG,Li QIN,Peng ZHANG,Dan LI,Ming-Kai LIU,Po WANG
Building a precise, sensitive, and selective sensing platform is highly significant for microRNA (miRNA) detection. Herein, an innovative ratiometric electrochemical biosensor sensitized with carbon nanoparticles-functionalized SnS 2 nanoflowers ( [email protected] 2 NFs) and enzyme-assisted target recycling was explored for analysis of miRNA-21. In this strategy, the application of hierarchical [email protected] 2 NFs structure as electrode material not only enhanced the surface loading capability for subsequent reactions but also improved the interfacial electron transfer. After introducing enzyme-assisted target recycling, single-target miRNA-21 could initiate the cleavage of multiple capture DNA strands by duplex-specific nuclease (DSN), leading to numerous rest single-strand DNAs on the electrode. Two probes, methylene blue-labeled probe 1 (probe 1-MB) and ferrocene-labeled probe 2 (probe 2-Fc), could selectively and competitively hybridize with the capture DNA and the rest single-strand DNA, depending on the completeness of DNA hybridization. By measuring the peak current intensity ratio of Fc and MB, miRNA-21 was quantified in a wide concentration range from 1 fmol/L to 10 pmol/L, with a detection limit of 300 amol/L. Moreover, this sensing system showed good analytical performance in the presence of interfering sequences and complex matrices, illuminating excellent selectivity and practical application potential of the hierarchical [email protected] 2 NF sensing interface.
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