Lubricants
·
2024
·Vol. 12
·期 9
·319
·
IF 3.1
Yaping Xing,Zhiguo Liu,Weiye Zhang,Zhengfeng Jia,Weifang Han,Jinming Zhen,Ran Zhang
In this study, MoS2nanosheets have been prepared and treated ultrasonically with silver ammonia solutions. The MoS2/Ag precursor was reduced using dopamine (DA) as reducing and linking agent at room temperature, and it was subjected to a hydrothermal treatment to produce MoS2/Ag nanocomposites (denoted as MoAg). The MoAg samples were functionalized with N-oleoylethanolamine to improve dispersion in the base oil component of additives. Use of the functionalized MoAg (denoted as Fc-MoAg) as a lubricant additive for steel balls resulted in effective friction reduction and anti-wear. This work avoids ion exchange during exfoliation, and the Ag+has been reduced to nano-silver particles by dopamine to enlarge the layer spaces of MoS2. Taking the case of lubrication with base oil containing Fc-Mo0.6Ag15, the wear scar diameters and coefficients of friction of the steel balls were 0.428 and 0.098 mm, respectively, which were about three-fifths base oil. In addition, MoS2/Cu and MoS2/Ni nanocomposites were synthesized and the tribological properties associated with steel/steel balls assessed. The results demonstrate that all MoS2/metal composites exhibit enhanced tribological behavior in the steel/steel pair tests. Both nanocomposite synergy and the tribofilm containing sulfide, oxide, carbide, and other compounds play important roles in achieving reduced friction and improved anti-wear. The friction and wear properties of base oil containing Fc-MoAg and commercial additives were evaluated using a four-ball wear tester with steel/steel, steel/zirconia and zirconia/zirconia pairs. The base oil containing Fc-MoAg delivered smaller coefficients of friction (COFs) and/or scarring groove depths than those observed with the use of pure base oil and base oil containing commercial additives.
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Materials
·
2024
·Vol. 17
·期 12
·2795
·
IF 3.1
Fei Wang,Tiexin Cheng,Guangdong Zhou
Ethanol possesses high economic value, but as an industrial waste, it poses harm to human health and the environment. The paper describes the preparation of a thermoplastic polyurethane-poly(n-isopropylacrylamide) (TPU-PNIPAM) copolymer designed to selectively uptake alcohol in aqueous solution. The material was created by bonding TPU and PNIPAM together through intermolecular hydrogen bonds, enhancing its hydrophobic properties and making it easier to interact with alcohol molecules. As the amount of PNIPAM in TPU increases, the number of hydrophobic isopropyl groups in TPU-PNIPAM also increases, leading to an enhanced selective uptake ability of TPU-PNIPAM for alcohols in aqueous solution. When the temperature reaches 55 °C, the hydrophobic groups in TPU-PNIPAM are more exposed, further enhancing the selective uptake ability of TPU-PNIPAM for alcohols in aqueous solution. TPU-PNIPAM demonstrates selective preferential uptake for various concentrations and types of alcohol in aqueous solutions. The material’s selective uptake performance for alcohols increases with their hydrophobicity, so TPU-PNIPAM exhibited the best adsorption performance for a 10 wt% n-propanol solution under the combined effect of steric hindrance. In addition, TPU-PNIPAM exhibited selective adsorption for other organic solvents, which demonstrated the universality of TPU-PNIPAM in removing contaminants from aqueous solutions.
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Advanced Energy Materials
·
2025
·
IF 26
Xinyuan Li,Jianchao Jia,Yongqiang Dai,Xuanshuo Zhang,Lifeng Guan,Dehui Zhang,Fei Wang,Qianming Wang,Wei Zeng
The design of high-performance n-type ionic thermoelectric cells (i-TE cells) tailored for harvesting low-grade thermal energy presents significant challenges. In this study, an n-type i-TE cell exhibiting substantial negative thermopower and a high output energy density is developed by leveraging the synergistic interplay between thermal diffusion within an ionic hydrogel electrolyte and redox reactions at the electrode interface. Specifically, a gel network featuring dual positive groups is synthesized by cross-linking quaternized chitosan and guanidine molecules via glutaraldehyde, with thermal diffusion further enhanced by incorporating crown ether for complexation. Additionally, NiCo(CO 3 )(OH) 2 , a material known for its high hydrophilicity, is utilized as the anode to facilitate rapid ion and electron transfer at the electrode interface. The integration of optimized thermal diffusion within polycationic electrolytes with electrode interface-enhanced ion/electron transport mechanisms significantly improves the sustained output performance and thermoelectric conversion efficiency of the i-TE cell. Notably, the thermopower (Seebeck coefficient) of this n-type i-TE cell achieves a value of −26.04 mV K −1 , and its 2 h output energy density reached 1301.61 J m −2 under a temperature difference (ΔT) of 15 K. These findings offer a novel design paradigm for high-performance n-type i-TE cell.
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ADVANCED MATERIALS
·
2021
·Vol. 33
·期 49
·2104330
·
IF 30.849
Yali Sun,Pengfei Qiu,Wei Yu,Jianjun Li,Hongling Guo,Li Wu,Hao Luo,Rutao Meng,Yi Zhang,Shengzhong (Frank) Liu
As a low-cost substitute that uses no expensive rare-earth elements for the high-efficiency Cu(In,Ga)(S,Se) 2 solar cell, the Cu 2 ZnSn(S,Se) 4 (CZTSSe) solar cell has borrowed optimization strategies used for its predecessor to improve its device performance, including a profiled band gap and surface inversion. Indeed, there have been few reports of constructing CZTSSe absorber layers with surface inversion to improve efficiency. Here, a strategy that designs the CZTSSe absorber to attain surface modification by using n-type Ag 2 ZnSnS 4 is demonstrated. It has been discovered that Ag plays two major roles in the kesterite thin film devices: surface inversion and front gradient distribution. It has not only an excellent carrier transport effect and reduced probability of electron-hole recombination but also results in increased carrier separation by increasing the width of the depletion region, leading to much improved V OC and J SC . Finally, a champion CZTSSe solar cell renders efficiency as high as 12.55%, one of the highest for its type, with the open-circuit voltage deficit reduced to as low as 0.306 V (63.2% Shockley-Queisser limit). The band engineering for surface modification of the absorber and high efficiency achieved here shine a new light on the future of the CZTSSe solar cell.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Zichen Song,Xinxin Zhang,Jianqiu Zhu,Xiaolei Wang,Wenqian Wang,Xiangbo Ma,Jiantao Fu,Jian-Qiang Wang,Guiling Wang,Zhiyu Ren,Honggang Fu
While copper complexes intrinsically provide Cu sites for electrocatalytic CO 2 reduction (ECR), their efficacy toward multicarbon products (C 2+ ) remains fundamentally limited by the operational instability of reactive Cu valence states and the inability to synchronously optimize *CO intermediate generation and C-C coupling within symmetric coordination environments. Herein, we judiciously design a single-crystal N, O co-coordinated copper complex (Cu(ICA) 2 ) featuring asymmetric N 2 -Cu-O 2 centers that precisely modulate the electronic structure and local adsorption environment. The Cu-N bonds stabilize partially reduced Cu δ⁺ sites while weakening Cu-O interactions, thus balancing structural integrity with catalytic reactivity. This asymmetric dual-site coordination concurrently hosts distinct *CO intermediates (atop-adsorbed *CO at Cu sites and bridge-adsorbed *CO at Cu-N sites), enabling cooperative C-C coupling into C 2 products. The catalyst achieves a record 69.2 % Faradaic efficiency for C 2 products at 400 mA cm −2 and 57.4 % for C 2 H 4 at 500 mA cm −2 in 1.0 M KOH, rivaling the state-of-the-art Cu-based complexes. In situ characterization and DFT calculations mechanistically corroborate that bridge-adsorbed *CO at Cu-N sites drives energetically favorable hydrogenation and C-C coupling pathways. This work establishes a coordination-asymmetry design principle for constructing robust molecular catalysts capable of efficient CO 2 -to-C 2+ conversion.
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ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 21
·2107314
·
IF 19.924
Zhichao Xie,Chenyu Zhuge,Yanfei Zhao,Wei Xiao,Yujun Fu,Dongliang Yang,Shunpeng Zhang,Yingtao Li,Qi Wang,Yazhou Wang,Wan Yue,Iain McCulloch,Deyan He
Artificial synaptic devices are the basic composition units for neuromorphic computing processors that realize massive parallel computing. However, the n-type organic transistors have failed to achieve good performance as an artificial synaptic device for neuromorphic computing until now. Here, a vertical three-terminal n-type organic artificial synapse (TNOAS) using a lithium ion-based organic dielectric and the n-type donor–acceptor (D–A) conjugated polymer-naphthalene-1,4,5,8-tetracarboxylic-diimide-thiophene-vinyl-thiophene (NDI-gTVT) as the channel is proposed. The TNOAS achieves nonvolatile conductance modulation with high current density operation (≈10 KA cm −2 ) at low voltage and mimics the basic functions of biological synapses, such as long-term synaptic plasticity and paired-pulse facilitation. The minimum energy consumption of a response event triggered by a single action potential is 6.16 pJ, which can be comparable with p-type counterparts. Moreover, simulation using handwritten digital datasets exhibit a high recognition accuracy of 94%.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Liqing Ai,Weikang Lin,Limei Ai,Yannan Li,Mengyi Qiang,Xiaoya Wang,Min Shi,Zhengbao Yang,Xi Yao
The integration of soft, conformable components and rigid microelectronics or devices is a critical frontier in stretchable hybrid device development. However, engineering interconnects capable of tolerating high-stress concentrations and preventing debonding failures remain a key challenge. Here a stretchable conductive interconnect derived from the liquid metal conductor with supramolecular confinement is reported, capable of reliably connecting soft and rigid parts through a simple “Heat-Press-N-Go” method. Leveraging the dynamic bonding nature of supramolecular polymers, when confined within liquid metal compartments, not only effectively stabilizes the conductive path of the stretchable interconnect, but also offers high adhesion to diverse surfaces, reaching an exceptional electrical stretchability of up to 2800%. As proof of concept, this interconnect is used to assemble wearable devices including reconfigurable stretchable circuits, multifunctional sensors, and on-skin electromyography, exhibiting high signal integrity and mechanical durability. The “Heat-Press-N-Go” chip and circuit integration offers the boundless potential to enhance the adaptability, convenience, and versatility of on-skin and wearable electronics across various applications.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·Vol. 34
·期 24
·2313719
·
IF 18.5
Yingchao Wei,Zheng Ma,Wang Li,Chengjun Li,Boyu Yang,Chengwei Sun,Shuangfu Gang,Wenguang Zhang,Hui Long,Xin Li,Qinghui Jiang,Dan Zhang,Yubo Luo,Junyou Yang
Exploring N-type High-entropy materials with both high thermoelectric and mechanical properties is highly desirable for all-high-entropy thermoelectric generators (TEGs) since the thermoelectric and mechanical properties of N-type one are largely behind its P-type counterparts. Herein, a new rock-salt structure N-type high entropy thermoelectric AgBiPbSe 2 S is introduced with a bandgap of ≈0.43 eV. The atomic radii difference of each component results in a large lattice distortion of 0.246, leading to a low thermal conductivity of 0.36 W m −1 K −1 at 823 K. The figure of merit ( ZT ) reaches 0.6 for AgBiPbSe 2 S at 823 K. Moreover, Ag 2 Se precipitates are included in AgBiPbSe 2 S to filter low energy carriers for high Seebeck coefficients and to scatter phonons with nanoscale wavelength for ultralow lattice thermal conductivities. Consequently, a peak ZT of ≈1.18 at 823 K and an average ZT of 0.60 at 400–823 K are obtained for Ag 1.02 BiPbSe 2 S. More importantly, high mechanical properties are also obtained in Ag 1.02 BiPbSe 2 S, of which the Vickers hardness and flexural strength are ≈209 Hv and 32 MPa, respectively, originating from the enhanced lattice friction by chemical short-range disorder (i.e., high entropy effect) and dispersion strengthening caused by Ag 2 Se nanoprecipitates.
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Nano Energy
·
2021
·
IF 17.881
Boyang Yu,Han Xiao,Yilin Zeng,Shiyou Liu,Dirui Wu,Pei Liu,Jinhua Guo,Wenke Xie,Jiangjiang Duan,Jun Zhou
Emerging thermocells have the commercialized potential for directly harvesting low-grade heat. Although a huge progress in p-type thermocells, their n-type counterpart has seriously lagged, becoming a major bottleneck for practical utilization of their integrated devices. Here, we developed a novel Cu-based thermosensitive crystallization and 3D multi-structured electrodes to synergistically boost the thermodynamic and kinetic characteristics of the n-type thermocell. As a result, the optimized Cu/Cu 2+ -based system achieved an exceptionally high value for the Seebeck coefficient (1.66 mV K –1 ) and the power density (3.5 W m –2 ), accompanied with a much competitive cost-performance metric (~$3.28 W –1 ), all of which were superior to the p-type benchmark. Furthermore, a high-performance p-n junction of thermocells was demonstrated with a 14.5 times enhancement of output, paving the way for advancing the integrated devices.
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Nanoscale
·
2024
·
IF 5.8
Yuke Zheng,Yunliang Dai,Yiwen Fu,Xiaojuan Zhang
Structural construction and heteroatom doping are deemed effective strategies for designing a high-performance microwave absorbing composite to eliminate electromagnetic hazards. Herein, a series of core–shell structural carbon@N-doped carbon (C@NC) nanospheres were successfully fabricated without employing additional modifying agents and sophisticated operation. After incorporating them into a polyvinylidene fluoride (PVDF) matrix, the C@NC/PVDF composites possess tunable wave attenuation capacity obtained by regulating the coating layer thickness and filler loading. Benefitting from the design strategy of the core–shell structure and N-doped C, the C@NC-2/PVDF composites displayed the broadest effective absorption bandwidth of 6.29 GHz (11.71–18 GHz) under a filler content of only 10 wt% at 2.01 mm. Additionally, the minimum reflection loss value of C@NC-3/PVDF composites achieves −62.87 dB within the same mass ratio at a thickness of 2.35 mm. The excellent wave dissipation ability is attributed to the combination of optimized impedance matching and synergistically enhanced multiple loss mechanisms including conduction loss, interfacial polarization as well as dipolar polarization. This work offers a ponderable paradigm for the deeper exploitation of high-efficiency carbon absorbers.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Fei Wang,Guangcai Ma,Guofeng Cheng,Wenqing Hu,Zengtao Lv,Bin Chen,Wenbin Li,Yumeng Zang,Pengshan Liu,Zhuo Zhang
In this work, an efficient and stable photo-assisted electrocatalyst of N-doped CoNiOOH for overall seawater splitting are proposed. The doped N atoms triggered local contractions of lattice, thereby, promoted the morphologies of products to evolve from nanoflowers to nanowires (NWs), and the obvious electrocatalytic enhancements. Especially under the illumination of AM 1.5 G, the U30-NWs exhibited a photo-assisted cathodic current density from −2.0 to −4.0 mA cm −2 at −0.05 V vs RHE, and also an anodic stability for more than 48 hours in seawater . Our studies reveal that the doped N atom could accumulate more electrons than O atom, leading to the degradation of Co and Ni 3d and O 2p states on either side of Fermi level , thus a p-type feature with the widened band gap and improved UV–visible light absorption. Meanwhile, the corrosion resistance was thus improved due to the chemical stable N-Co(Ni)-N bonds. This work provides a practical strategy towards the H 2 production via photo-assisted electrocatalytic seawater splitting.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xue Wu,Hui Li,Fei Ge,Wenlin Xu,Hailong Lu,Minghao Zhou
Upgrading of lignin-derived bio-oil to value-added biofuel was of great significance for efficient utilization of renewable resources and reducing the use of fossil fuels. Hydrodeoxygenation (HDO) was considered to be a promising technology for the conversion of lignin-derived bio-oil. Herein, we reported a novel method for the preparation of lignin-MOF derived N-doped catalysts, which was then successfully introduced into the upgrading of lignin-derived phenols and lignin depolymerization. All catalysts were well characterized and Co/CN-0.5–750 exhibited excellent performance during the catalytic HDO process. The optimized catalyst demonstrated highly efficient active hydrogen generation from isopropanol. Moreover, it could afford the best vanillin (VAN) conversion (100 %) and highest 2-Methoxy-4-methylphenol (MMP) yield (92 %) under the mild reaction conditions (180 °C, 0.5 MPa nitrogen, 2 h). It was confirmed that the excellent performance was related to nitrogen doping. This study could provide some useful insights for the hydrodeoxygenation of lignin and its derivative.
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