JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 7
·3066-3077
·
IF 4.5
Liu Xiang,He Zhanglong,Li Tao,Wang Xiaodong,Zhao Chen,Liu Shan,Liu Yuling,Fan Zheqiong,He Hao
MnO 2 is a promising catalyst for oxygen reduction and metal–air batteries due to the natural abundance, low cost and nontoxicity. Improving its activity is an important challenge for its large-scale commercialization. Defect engineering and heteroatom doping are the most effective means and can be easily operated through plasma treatment at different atmospheres. In this work, defects on MnO 2 are manufactured via rapid plasma treatment at Ar atmosphere while both defects and N-doping are simultaneously fabricated at N 2 atmosphere. N–MnO 2 exhibits a greatly enhanced ORR activity with a half-wave potential of 0.84 V, a limiting current density of 6.7 mA cm −2 and the number of transferred electrons of 3.9. In neutral Mg-air battery, N–MnO 2 -based battery exhibits a max power density of 124.3 mW cm −2 at a current density of 255.4 mA cm −2 and excellent stability under different working condition. These superior performances of N–MnO 2 to Ar–MnO 2 and pristine α -MnO 2 demonstrate that the defects and N-doping by plasma treatment at N 2 atmosphere significantly enhance the oxygen reduction activity. This work reveals the relationship between microstructure and oxygen reduction reaction and supplies a new idea for the developing economical and efficient oxygen reduction reaction catalysts for metal–air batteries. Graphical
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Materials Horizons
·
2017
·Vol. 4
·期 2
·274-280
·
IF 10.706
Ke Zhang,Mingzeng Peng,Wei Wu,Junmeng Guo,Guoyun Gao,Yudong Liu,Jinzong Kou,Rongmei Wen,Ying Lei,Aifang Yu,Yang Zhang,Junyi Zhai,Zhong Lin Wang
Flexible functional devices based on two dimensional (2D) materials are extremely suitable for malleable, portable and sustainable applications, such as health monitoring, electronic skin and optoelectronics. In this work, we developed a flexible photodetector based on a p-CuO/n-MoS2 heterojunction with an enhancement in photocurrent and detection sensitivity. Because of the non-centrosymmetric structure in monolayer MoS2, the piezo-potential induced by applied strain adjusts the band structure at the heterojunction interface and broadens the depletion region based on the piezo-phototronic effect. The border depletion can be discreetly used to improve the photo-generated carrier separation and transport to enhance photoresponse performance. When illuminated by a 532 nm laser, the photocurrent of the heterojunction can be enhanced 27 times under a tensile strain of 0.65% compared to strain free conditions and the detection sensitivity can reach up to 3.27 × 108 Jones. As a result, our research provides a new strategy for novel design and performance optimization of 2D material heterostructures in the application of optoelectronics.
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Nano-Micro Letters
·
2020
·Vol. 13
·期 1
·1-15
·
IF 12.264
Tian Yuhui,Xu Li,Li Meng,Yuan Ding,Liu Xianhu,Qian Junchao,Dou Yuhai,Qiu Jingxia,Zhang Shanqing
Interface engineering of heterogeneous CoS/CoO nanocrystals and N-doped graphene composite facilitates high-performance oxygen reduction reaction and oxygen evolution reaction.
Density functional theory calculations and experimental results confirm the enhanced electrocatalytic performances via the proposed interface engineering.
The bifunctional oxygen electrocatalyst exhibits excellent performances in rechargeable Zn–air batteries.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Zhijia Liao,Zhenyu Yuan,Hongliang Gao,Fanli Meng
In this study, porous sheet-like nanostructured Co 3 O 4 -CuO-CuOHF composites with great n-butanol sensing properties were synthesized by the biotemplate method and hydrothermal method . The effect of various contents of Co 3 O 4 -CuO-CuOHF sensor performance was systematically investigated, in which the best performance was achieved for the composite with 0.03 g Co 3 O 4 addition. The response of the best content Co 3 O 4 -CuO-CuOHF composite sensor to 100 ppm n-butanol at 180 ℃ is 120, which is 8 times higher than that of the CuO-CuOHF sensor. The composite sensor has excellent selectivity for n-butanol and responds 3.75–25 times higher to n-butanol than other target gases. It is detectable up to 500 ppb n-butanol and has potential promise for low concentration detection. Furthermore, it has outstanding stability and resistance to humidity. The gas sensing mechanism was analyzed by UV–visible diffuse reflectance spectroscopy, EPR oxygen vacancies and X-ray photoelectron spectroscopy, which indicated that the abundant oxygen vacancies , the physical adsorption of polar hydroxyl bonds, the electronegative fluorine substitution and the special microstructure of the composite contributed to its gas-sensitive performance.
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Materials Today Energy
·
2020
·
IF 5.604
Ziqi Zhang,Linchuan Cong,Zhuochen Yu,Lina Qu,Weimin Huang
Hydrogen is one of the most desirable sources with large energy density . Electrocatalysis of hydrogen evolution reaction is a promising way to produce hydrogen since it can be powered by renewable energy such as solar and wind energy . However, the mainstream electrocatalyst is noble metal (Pt/Ru/Ir), which is expensive and rare. It is necessary to develop non-noble metal catalysts toward HER from the perspective of sustainable development and long-term environmental conservation. Therefore, this paper provides a cheap and feasible way to synthesize the Fe–Ni bimetallic N-doped carbon framework (Fe–Ni@NCF). The prepared Fe–Ni@NCF exhibits the desired overpotential of 219 mV at 10 mA cm −2 in alkaline and 259 mV at 10 mA cm −2 in acidic solution, respectively. Besides, it exhibits similar current density loss as commercial Pt/C after 10,000 segments of CVs, which suggests satisfactory durability.
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Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2023
·
IF 3.6
Wen Ding,Xiaozhong Wu,Zhichao Miao,Jin Zhou,Shuping Zhuo
As an inexpensive and renewable anode material with the advantages of less intercalation-induced exfoliation, superior molecularly doping performance, and outstanding rate capacity, hard carbon material attracts extensive attention in lithium-ion batteries (LIBs) and potassium-ion batteries (KIBs). In this work, a series of glucosamine hard carbon microspheres (GCMs) are synthesized through facile and inexpensive hydrothermal and pyrolysis procedures. The obtained hard carbon microspheres as anode material provide favorable dual functionality for both LIBs and KIBs. The electrochemical performance of GCMs electrodes at various carbonation temperatures is fully evaluated. The as-prepared GCM-900 is an admirable anode for LIBs, with good reversible capacity (407.8 mAh/g at 0.1 A/g after 200 cycles) and rate performance. Correspondingly, the GCM-1100 is good for KIBs (269.9 mAh/g at 0.05 A/g and 161.9 mAh/g after 100 cycles at 0.1 A/g).
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Petroleum Science
·
2021
·Vol. 18
·期 2
·654-666
·
IF 4.09
Wen Cheng-Long,Xu Jun-Dong,Wang Xue-Man,Fan Yu
To enhance the gasoline octane number, low-octane linear n-alkanes should be converted into their high-octane di-branched isomers via n-alkane hydroisomerization. Therefore, hierarchical SAPO-11-based catalysts are prepared by adding different contents of sodium dodecylbenzene sulfonate (SDBS), and they are applied in n -nonane hydroisomerization. When n (SDBS)/ n (SiO 2 ) is less than or equal to 0.125, the synthesized hierarchical molecular sieves are all pure SAPO-11, and as the SDBS content increases, the submicron particle size decreases, and the external surface area (ESA) increases. Additionally, these hierarchical SAPO-11 have smaller submicron particles and higher ESA values than conventional SAPO-11. When n (SDBS)/ n (SiO 2 ) is greater than 0.125, with increasing SDBS content ( n (SDBS)/ n (SiO 2 ) = 0.25), the synthesized SAPO-11 contains amorphous materials, which leads to a decline in the ESA; with the further increase in SDBS content ( n (SDBS)/ n (SiO 2 ) = 0.5), the products are all amorphous materials. These results indicate that in the case of n (SDBS)/ n (SiO 2 ) = 0.125, the synthesized SAPO-11 molecular sieve (S–S 3 ) has the most external Brønsted acid centers and the highest ESA of these SAPO-11, and these advantages favor generation of the di-branched isomers in hydrocarbon hydroisomerization. Among these Pt/SAPO-11 catalysts, Pt/S–S 3 displays the highest selectivity to entire isomers (83.4%), the highest selectivity to di-branched isomers (28.1%) and the minimum hydrocracking selectivity (15.7%) in n -nonane hydroisomerization.
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FUEL
·
2025
·
IF 7.5
Dan Zhang,Maowei Luo,Xianming Zhu,Faisal Irshad,Hamzah A.S.M. Yaseen,Chao Mu,Yong Wang,Shengping Wang,Xinbin Ma
CO 2 hydrogenation to formate is a crucial process for achieving carbon neutrality. A biomass-derived N and P co-doped carbon-supported Pd catalyst (Pd/CNP) was fabricated. N and P co-doping could enhance the catalytic performance by modulating Pd electron cloud density (the Pd 0 /(Pd 2+ +Pd 0 ) ratio), promoting Pd dispersion, and increasing the content of pyrrole-N, which promoted the dissociation of H 2 and the adsorption and activation of CO 2 . Due to the strong interaction between Pd and the heteroatoms of N and P, the Pd/CNP catalyst exhibited the highest catalytic activity (TON = 1655) in samples with different doping and pyrolysis temperatures. Kinetic analysis showed that Pd/CNP reduced the activation energy of CO 2 hydrogenation to formate compared with that of Pd/C. The kinetic equation of Pd/CNP is R’= k·M NEt3-CO2 0.65 ·P H2 1.21 (NEt 3 refers to triethylamine), and NEt 3 -CO 2 is a better choice of carbon source for hydrogenation than bicarbonate and CO 2 , which is obviously different from that of Pd/C catalyst.
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Polymers
·
2026
·Vol. 18
·期 15
·1890
·
IF 5.8
Ley Boon Sim,Jia Han,Yongming Zeng,Haoqi Wang,Yujia Qin,Weiwei Wang,Haiping Yang,Aygul Kadir
Numerous previous investigations have exploited single-component aluminum hydroxide, silica, or phosphorus-containing organic agents to improve the fire resistance of epoxy resin. Existing literature confirms that ATH relies on endothermic dehydration and inorganic barrier layers to suppress combustion, while phosphorus organics exert radical quenching effects in the gas phase. However, separate use of these fillers generally requires high loading to achieve satisfactory flame retardancy, which inevitably weakens the mechanical properties of the epoxy matrix; few studies integrate N, P, and Si elements into ATH via chemical grafting to realize synergistic flame retardancy at low filler dosage, and the dual heat-transfer regulation effect of formed SiO2-Al2O3inorganic residues has rarely been systematically discussed in prior reports. This study presents an organic–inorganic hybrid flame retardant, SPDP-PTMS@ATH, synthesized by grafting N,P,Si-containing organic groups onto Al(OH)3. The modified ATH retained its layered structure, as confirmed by FTIR, XPS, SEM, and XRD. At only 5 wt.% loading in epoxy, the additive significantly enhanced flame retardancy and smoke suppression: LOI increased to 33.5% (34% higher than pure EP), UL-94 reached V-0 rating, and peak HRR, THR, COPR, TSR, CO2PR, and SPR are reduced by 30.2%, 30.8%, 33.1%, 26.9%, 25.86%, and 15%, respectively. Char analysis revealed a denser, more graphitized structure with fewer defects. Moreover, tensile strength and elongation at break improved by 22.0% and 47.5%, respectively. This work demonstrates that low-loading SPDP-PTMS@ATH simultaneously boosts fire safety, smoke suppression, and mechanical performance, offering a cost-effective and sustainable route to high-performance epoxy composites.
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PubMed
高影响因子
Journal of Energy Chemistry
·
2026
·
IF 15.6
Jingyu Sun,Li Zhang,Fengbo Li,Zhen Cao,Meiyu Liu,Fajun Yang,Shaobin Li
The vanadium disulfide (VS 2 ) possesses great potential as an excellent zinc-ion energy storage material due to low diffusion barrier and reversible redox activity. However, its high-rate zinc-ion storage capability is limited by nanosheet restacking, structural fragility, and vanadium dissolution. Herein, a synergistic strategy integrating oxygen-induced coordination reinforcement with C–N structural and conductive network reinforcement is proposed to realize thermodynamic-kinetic stabilization of VS 2 cathodes. The incorporation of oxygen converts unstable V–S bonds into a stronger, more ordered V–O coordination, reconstructing the ligand field and stabilizing the vanadium valence state, which effectively inhibits dissolution. Concurrently, the polydopamine (PDA)-derived C–N provides stable anchoring sites to immobilize vanadium species, while CNT frameworks build efficient electron/ion transport pathways and buffer volume strain. The DFT calculations and synchrotron analyses verify the ligand-field reconstruction and vanadium stabilization mechanism. Consequently, the VS 2 /V 2 O 3 -NC/MWCNTs-C (denoted as VSO-NC/MWCNTs-C) delivers a high capacity of 358.89 mA h g −1 at 0.5 A g −1 , excellent rate capability of 242.22 mA h g −1 at 10 A g −1 , along with a high energy/power density of 388.64 Wh kg −1 /1000 W kg −1 , maintaining excellent stability over 6000 cycles at 10 A g −1 . This work offers an atomic-level coordination engineering strategy for advanced V-based cathodes for zinc-ion energy storage. The VSO-NC/MWCNTs-C cathode exhibits stable structural integrity, accelerated Zn 2+ transport, and significantly suppressed vanadium dissolution, delivering high capacity, fast kinetics, and long-life cycling for next-generation zinc-ion energy storage. Download: Download high-res image (301KB) Download: Download full-size image
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CHEMICAL ENGINEERING SCIENCE
·
2026
·
IF 5.1
Wenxuan Xu,Shouzhi Chen,Rui Tian,Tao Yu,Junqiang Wang,Wenjing Wang,Fuzhi Guo,Fei He,Shaopeng Rong
n-Propylamine, a toxic nitrogen-containing volatile organic compound (NVOC), poses health and environmental risks alongside intense odours. Its photothermal catalytic oxidation is effective, but the synergy between photocatalysis and thermocatalysis remains unclear. This study compared five MnO 2 catalysts with different tunnel structures (α, β, γ, δ, τ) for ambient-temperature self-heating photothermal oxidation of n-propylamine. Remarkable crystal phase-dependent catalytic performance was observed, with α-MnO 2 exhibiting superior activity achieving 93.6% CO 2 yield and, notably, 100% N 2 selectivity without detectable NO x emissions. Mechanistic studies reveal a photothermal coupled catalysis mechanism: light-induced excitation weakens Mn–O bonds and activates lattice oxygen, while the photothermal effect simultaneously promotes charge transfer and drives thermocatalytic decomposition. Furthermore, in-situ DRIFTS combined with mass spectrometry and ion chromatography elucidated a bifurcated degradation pathway: C–N bond cleavage yielding propyl radicals (undergoing stepwise oxidation to CO 2 via alcohols, aldehydes, and carboxylic acids) and amino radicals (selectively converted to N 2 via photo-iSCR or NH 3 -SCO mechanisms); concurrently, a dehydrogenation route produces propionitrile as a transient intermediate that eventually feeds into the main oxidation cascade. This work provides fundamental insights into the crystal structure-dependent photothermal catalytic performance and establishes a comprehensive mechanistic framework for n-propylamine oxidation, offering rational guidelines for designing high-performance catalysts for NVOC abatement.
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FLUID PHASE EQUILIBRIA
·
2026
·
IF 2.7
Jian-an Wang,Jiahao Shi,Junyu Feng,Qingsong An,Shengshan Bi
High-pressure density data of n -alkanols are essential for the design of biodiesel blended fuels and fuel injection in marine engines. However, reliable experimental data for n -alkanols (C4–C7) under high pressures (up to 200 MPa) remain scarce. In this study, a high-pressure density measurement system based on the variable-volume method was established, achieving a combined expanded uncertainty of 0.27% ( k = 2). The densities of n -alkanols (C4–C7) were measured over the temperature range of 303.15–383.15 K and pressures up to 200 MPa. The measured data were accurately correlated using the Tammann-Tait equation, and the derived thermodynamic properties were obtained. Then, the parameters of the Perturbed-Chain Statistical Associating Fluid Theory (PC-SAFT) equation of state (EoS) for n -alkanols were optimized using the 2B association scheme. Within the experimental range, the average absolute relative deviation (AARD) between the calculated and experimental densities was <0.1%, demonstrating the applicability of the model for ultra-high-pressure volumetric calculations. This study addresses the gap in high-pressure property data for n -alkanols (C4–C7) and provides a critical experimental and modeling foundation for the development of efficient and clean marine power systems. Download: Download high-res image (351KB) Download: Download full-size image
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