JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Nan Xin,Yifei Li,Guihua Tang,Longyun Shen
High-efficient and environment-friendly thermoelectric materials have attracted much attention. The single crystal tin selenide (SnSe) has a record high thermoelectric figure of merit ( ZT ) of 2.6 at ~800 K. Polycrystalline SnSe has better mechanical-strength but inferior ZT values than the single crystal, attribute to the paradoxically higher thermal conductivity ( κ ). In this work, we synthesized K x Sn 1−x Se (x = 0, 0.01, 0.02, 0.03 and 0.04) by doping K 2 CO 3 . A large number of point defects and dislocations generated with CO 2 volatilization, which possibly reduces κ . Based on this process, the K x Sn 1−x Se powders were followed by the hydrogen reduction with 4% H 2 − 96% Ar atmosphere to reduce tin oxide and potassium oxide which have high κ . These strategies lead to an ultra-low κ 0.32 Wm −1 K −1 in K 0.03 Sn 0.97 Se at 798 K. The effects of K doping on electronic transport performance of SnSe were studied by density functional theory calculation and experimental measurement. Doing K can narrow the band gap, increase hole concentration and enhance the electrical conductivity ( σ ) of SnSe. At 298 K, the σ of K x Sn 1−x Se increased by more than 2.5 times compared with the pristine SnSe. In high temperature region (623 K< T < 823 K), the σ is mainly affected by thermal excitation. High doping level of K (x = 0.03 and 0.04) suppresses the thermal excitation and limits the maximum of ZT . As the result, A high ZT of 1.06 is obtained at 798 K from K 0.01 Sn 0.99 Se perpendicular to the pressing direction, which is 103.8% larger than that of pristine SnSe. In addition, the hot-pressing polycrystalline K x Sn 1−x Se remains obvious lamellar morphology and show anisotropy. The σ and κ of K x Sn 1−x Se samples perpendicular to the pressure direction are much higher than those of the samples parallel to the pressure direction. This anisotropy decreases with the increasing K content.
研究领域:
材料科学
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能源科学
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产品关联
DOI
高影响因子
JOM
·
2023
·Vol. 76
·期 2
·969-975
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IF 2.6
Liu Hanning,Liu Peidong,Tian Qinghua,Dong Zhaowang,Chen Yubing,Guo Xueyi
Fe-36Ni invar alloys (Invar 36 alloys), which have a low thermal expansion coefficient (CTE) and good mechanical properties, are typically produced through a high-pollution smelting process. A green and quick-process method for the two-step hydrogen reduction of a designed mixture of Fe 2 O 3 and NiO powders was developed to prepare Fe-36 wt.%Ni alloys. A dense Fe-36 wt.%Ni alloy with an oxygen content of 0.20 wt.% was successfully produced. A single γ -FeNi phase was identified at 1000°C, whereas grains and twins became more evident at 1100°C. The final alloy exhibited excellent mechanical properties at room temperature, showing a hardness of 154 HV, a tensile strength of 486 MPa, a yield strength of 251 MPa, and a fracture strain of 21%.
研究领域:
材料科学
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冶金工程
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结构合金
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DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2024
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IF 10.8
Kang Liu,Zibo Xu,Mengmeng Wang,Daniel S. Alessi,Yuanzhi Tang,Daniel C. W. Tsang
Resource recovery from retired electric vehicle lithium-ion batteries (LIBs) is a key to sustainable supply of technology-critical metals. However, the mainstream pyrometallurgical recycling approach requires high temperature and high energy consumption. Our study proposes a novel mechanochemical processing combined with hydrogen (H2) reduction strategy to accelerate the breakdown of ternary nickel cobalt manganese oxide (NCM) cathode materials at a significantly lower temperature (450 °C). Particle refinement, material amorphization, and internal energy storage are considered critical success factors for the accelerated decomposition of NCM cathode materials. In our proposed approach, NCM cathode materials can develop active sites with carbon defects (Cv) and oxygen vacancies (Ov), which improve the reduction and breakdown of H2. The adsorbed H2 on the surface of NCM decomposes into H* and combines with oxygen to form OH species, which can be facilitated by Ov via the enhanced charge transfer. The introduced Cv can enhance H2 cracking and generate *C–H species to promote the thermal decomposition of NCM. The presence of defects proves to foster the preferential reduction of Mn(IV) by H2, leading to a lower activation energy for the NCM decomposition (from 139 to 110 kJ/mol) with less H2 consumption. Life cycle assessment suggests a reduction of 4.42 kg CO2 eq for the recycling of every 1.0 kg of retired batteries. This study can promote material circularity and minimize the environmental burden of mining technology-critical metals for a low-carbon transition.
研究领域:
材料科学
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环境科学
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能源工程
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产品关联
DOI
PubMed
高影响因子
CARBON
·
2023
·
IF 10.9
Zhou Yang,Jin Zhang,Changfeng Wang,Hanzhong Cui,Li Yang,Huiyan Zhang,Renguo Guan
Graphene has been recognized as reinforcement and/or protective coating for metal materials due to its unique electronic, mechanical properties and chemical inertness . Challenges of graphene agglomeration and weak graphene/metal interfacial bonding still exist during preparation. Here we report a novel method combining capillary-assisted self-assembly with nascent hydrogen reduction technique to one step coat Al foil with layered-stacking graphene. Al foil constructed slit is filled with graphene oxide (GO) suspensions and the generation of nascent hydrogen occurs at the GO/Al interface. The capillary force drives the GO flakes to layer-by-layer assemble on Al foil, as well as increases the reduction depth of GO. X-ray photoelectron spectroscopy (XPS) reveals that the reduced GO (rGO) binds with Al is not just through van der Waals forces, but with a strong interaction of developing C–O–Al bonds. The hydroxyl groups on GO plays an essential role in the formation of such C–O–Al configuration. Al foil coated with rGO through this capillary-assisted self-assembly with nascent hydrogen reduction method show good corrosion resistance compared to the pristine Al and directly drop-casted GO on Al. The proposed method can be readily applied to the fabrication of graphene/metal composites with improved interfaces.
研究领域:
材料科学
·
表面化学
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产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
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2024
·
IF 2.6
Wang Jian Ming,Chu Xue Qing,Zeng Han
Hemoglobin (Hb)-based electrodes were fabricated using a Co-based complex with cobalt nitrate hexahydrate and 2-methylimidazole as fundamental elements to accommodate enzymes via the conventional solvothermal method. The binding of redox protein molecules to metal–organic framework-based complexes occurred through a synergistic effect of hydrogen bonding and competitive complexation, resulting in a partially oriented arrangement of metalloprotein molecules with enhanced hydrophilicity. The Hb–Co complex was formed via a typical electrostatic quenching mode with a moderate binding capacity. The native heme site within Hb and the cofactor of the enzyme ligated with ZIF-67 were involved in the electron shuttle process. The former electro-active site displayed favorable electrochemical activity (apparent heterogeneous electron transport rate: 0.1 s –1 ). The inherent configuration of the cofactor in the protein and abnormal electrocatalytic activity of the incorporated protein were considerably maintained. The electrocatalytic efficiency could be affected by both the protein and the Co-based complex. The key step in restraining the electrochemical sensing performance was the H 2 O 2 mass transfer procedure. Graphical abstract The schematic illumination to the preparation procedure of hemoglobin-based electrode on the basis of Co element based MOF material: ZIF-67 as protein carrier via the collaborative effect of the hydrogen bond interaction and the competitive coordination between heme protein and elements in ZIF-67 as well as hemoglobin-induced electro-catalytic H 2 O 2 reduction.
研究领域:
生物化学
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材料科学
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电化学
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产品关联
DOI
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2018
·Vol. 28
·期 6
·2730-2741
·
IF 1.754
Zeng Han,Zhang Yu He,Ma Ting Mei,Huo Wen Shan
As-prepared magnetic nano-composite with Fe 3 O 4 as core and carboxymethylated Chitosan as shell was proposed to act as matrix to co-immobilize electron relay and myoglobin by the means of chemical coupling. Subsequently Mb based bio-cathode was fabricated through the procedure of drop-casting in the presence of external magnet and was examined its performance in direct electron transferring and catalysis in electro-reduction of H 2 O 2 with spectrometric and electro-chemical methods. Analysis in results indicated adjacent complexations between hetero-atoms in polymer and cofactors in enzyme/redox site of electron mediator would pose great impact on spectroscopic and electrochemical features of immobilized protein. These interactions would alter the path of electron shuttle and mechanism of catalysis.
研究领域:
生物化学
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材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2013
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IF 2.672
Bang Lin Li,Jing Rong Chen,Hong Qun Luo,Nian Bing Li
Silver nanoclusters (AgNCs) synthesized by using polyethyleneimine as a stabilizing scaffold have been confirmed as a novel material to exhibit high electrocatalytic activity for the reduction of hydrogen peroxide in this paper. The novel hydrogen peroxide electrochemical sensor was originally prepared based on the excellent electrocatalytic activity for the reduction of hydrogen peroxide at the polyethyleneimine-templated silver nanoclusters modified glassy carbon electrode (PEI/AgNCs–GCE). To achieve the optimum electrocatalytic activity for the reduction of hydrogen peroxide, the pH of the buffer solution and concentration of immobilizing AgNCs solution were optimized. Under optimum conditions, the PEI/AgNCs–GCE revealed a highly linear response to H 2 O 2 in the concentration of 10–1440 μmol L −1 with a detection limit of 1.8 μmol L −1 . Compared to some silver nanoparticles modified electrodes, the novel electrochemical sensor based on AgNCs exhibited a better electrocatalytic activity for the reduction of H 2 O 2 and a lower detection limit for the determination of H 2 O 2 .
研究领域:
分析化学
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生物医学工程
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纳米材料科学
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产品关联
DOI
高影响因子
CHEMICAL PAPERS
·
2022
·Vol. 76
·期 5
·2703-2719
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IF 2.146
Sun Ke Wei,Wang Fang,Ma Ting Mei,Zeng Han
Core–shell structure nano-composite made up of Ag nano-wire and metal organic framework material (MOF) was proposed to accommodate Hemoglobin (Hb) molecules. Influences of mutual interactions between Hb and components of core–shell nano-complex on direct electrochemistry and electro-catalytic efficiency on H 2 O 2 reduction of nano-composite with Hb attachment is the main objective of this exploration in this submission. The microscopy, spectrometry and electro-chemical techniques were used to achieve such goal in this paper. The experimental results revealed that the abutting ligation between Hb and Ag nano-wire would lead to the prominent alteration in configuration of heme site in Hemoglobin molecule. However such combination would not increase the active energy of substrate electro-reduction seriously. The quasi-reversible redox process with one proton and single electron participation for Hb-based electrode should be imputed to a typical thin-film confining pattern with normalized rate constant of heterogeneous electron shuttle at 6.6 × 10 –2 s −1 . Mass transferring step of electro-active species in nano-complex with Hb detention (normalized rate at 1.2 × 10 –4 s −1 ) should be regarded as the key factor in restraining the efficiency of enzyme-induced catalysis. Graphical abstract
研究领域:
材料科学
·
生物化学
·
电化学
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产品关联
DOI
高影响因子
Nuclear Science and Techniques
·
2016
·Vol. 27
·期 4
·1-6
·
IF 0.641
Kong Li-Xia,Wang Lan-Jie,Su Lan-Lan,Zhao Zhi-Jie,Yan Zhong-Dan,Zhang Gong-Jun,Zhou Xing-Fei
Palladium nanoparticles (Pd NPs) were fabricated by using insulin amyloid fibrils (INSAFs) as biotemplates. Atomic force microscopy measurements showed that ultra-small Pd NPs were well adsorbed and dispersed on surfaces of INSAFs. X-ray photoelectron spectroscopy confirmed the partial reduction of Pd ion into metallic Pd(0) probably due to the presence of Cys groups on surface of the insulin fibrils. The electrochemical performance of Pd/INSAFs to reduction of H 2 O 2 was further evaluated by cyclic voltammetry. The remarkably high electrocatalytic activity, low detection limitation and excellent stability make the Pd/INSAFs a promising bio-nanoelectrocatalyst.
研究领域:
生物材料学
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电化学
·
纳米生物学
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DOI
高影响因子
Polymers
·
2023
·Vol. 15
·期 11
·2574
·
IF 5
Donghan Li,Chen Yang,Ping Li,Lu Yu,Shufa Zhao,Long Li,Hailan Kang,Feng Yang,Qinghong Fang
Functional liquid fluoroelastomers are in high demand in new energy fields. And these materials have potential applications in high-performance sealing materials and as electrode materials. In this study, a novel high-performance hydroxyl-terminated liquid fluoroelastomer (t-HTLF) with a high fluorine content, temperature resistance, and curing efficiency was synthesised from a terpolymer of vinylidene fluoride (VDF), tetrafluoroethylene (TFE), and hexafluoropylene (HFP). A carboxyl-terminated liquid fluoroelastomer (t-CTLF) with controllable molar mass and end-group content was first prepared from a poly(VDF-ter-TFE-ter-HFP) terpolymer using a unique oxidative degradation method. Subsequently, an efficient “one-step” reduction of the carboxyl groups (COOH) in t-CTLF into hydroxyl groups (OH) was achieved via the functional-group conversion method using lithium aluminium hydride (LiAlH4) as the reductant. Thus, t-HTLF with a controllable molar mass and end-group content and highly active end groups was synthesised. Owing to the efficient curing reaction between OH and isocyanate groups (NCO), the cured t-HTLF exhibits good surface properties, thermal properties, and chemical stability. The thermal decomposition temperature (Td) of the cured t-HTLF reaches 334 °C, and it exhibits hydrophobicity. The oxidative degradation, reduction, and curing reaction mechanisms were also determined. The effects of solvent dosage, reaction temperature, reaction time, and ratio of the reductant to the COOH content on the carboxyl conversion were also systematically investigated. An efficient reduction system comprising LiAlH4can not only achieve an efficient conversion of the COOH groups in t-CTLF to OH groups but also the in situ hydrogenation and addition reactions of residual double bonds (C=C) groups in the chain, such that the thermal stability and terminal activity of the product are improved while maintaining a high fluorine content.Keywords:liquid fluoroelastomer;LiAlH4;reduction;hydroxyl
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Science-Advanced Materials and Devices
·
2025
·
IF 6.8
Bao Chen Han,Xue Qing CHU,Han ZENG
The co-mixture of graphene oxide and metal organic framework material is proposed to act as bio-macromolecule supporter. Hemoglobin based electrode is prepared via the conventional drip-casting method and heme protein molecules are incorporated into nano-complex. The role of oxygen-containing groups onto graphene oxide in the mutual interactions between elements within nano-composite as well as the integrated hemoglobin and its impact on the enzyme-involved electro-catalysis are the primary objective in the current manuscript. The analysis in the experimental results manifests that the existence of oxygen-containing groups onto GO would contribute to the improvement in the orderliness of nano-complex with hemoglobin molecule and the formation of amphiphilic micelle-like structure with hydrophobic outer surface and hydrophilic core. The mutual interaction between graphene oxide and metal organic framework would alleviate the binding strength of hemoglobin with metal organic framework to distort the aboriginal configuration of heme site within protein molecule. The synergistic effect of multiple interactions between metal organic framework and graphene oxide with oxygen-containing groups leads to the disappearance in the electro-chemical signal for the electro-active sites in graphene oxide. The interaction between elements of nano-complex would depress the electro-activity of redox sites in nano-composite and the integrated heme protein could play the role of the primary electro-active species in nano-complex with protein accommodation. The existence of oxygen-containing groups onto graphene oxide could slow down the charge transportation process via the mutual interaction between heme protein and graphene oxide to restrain the electro-catalytic efficiency.
研究领域:
生物化学
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材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2024
·
IF 2.4
Ying Shi Yu,Chu Xue Qing,Zeng Han
This study proposes a composite consisting of zinc-heteroaromatic chemical framework material and hollow carbon-based material, designed to host hemoglobin. A heme protein-based electrode is developed using the complex with protein entrapment. The competitive coordination of heme protein with carbon-based carrier results in a novel intermediate with distinctive spectrometric and electrochemical features. The interaction between redox protein supporter and heme protein would give birth to the predominant influences the configuration of the cofactor within the protein. The article elucidates the role of the intermediate species in heme protein-induced electrocatalysis. Two simultaneous redox processes occur on the heme protein-based electrode. The intermediate species exhibits the favorable heterogeneous electron transfer dynamics (the normalized rate constant: 4.2 s −1 ). The analysis in the enzyme-involved electro-catalysis suggests that the substrate diffusion dominates the sensing efficiency of the electrochemical sensor.
研究领域:
生物化学
·
电化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
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