JOURNAL OF RARE EARTHS
·
2022
·
IF 4.632
Ningyuan Wang,Xiaoqiang Wang,Yue Liu,Zhongbiao Wu
Traditional vanadium-based selective catalytic reduction (SCR) deNO x catalyst can hardly adapt to the gas conditions (much high NO 2 /NO x ratio at lower temperature) of the start-up and low loading periods for a gas turbine . Therefore, a W–Ti-CeO x catalyst with NO x storage and reduction (NSR) function was developed in this work for gas turbine exhaust NO x elimination. The experimental results reveal that W–Ti-CeO x catalyst exhibits high NO 2 adsorption capacity at relatively low temperature while that is quite low for V–W/TiO 2 . The abundant surface Ce 3+ species can be mainly responsible for its high adsorption ability owing to the reaction between NO 2 and Ce 3+ to form nitrate/nitrite species and NO. Meanwhile, the adsorption capacity of W–Ti-CeO x can easily regenerate at medium–high temperature and NH 3 -SCR reaction. Furthermore, W–Ti-CeO x also shows good NH 3 -SCR activity, which can fulfill the deNO x process at high temperature. The addition of W and Ti into ceria can enhance the surface acidity and redox ability, thereby increasing the SCR activity. This work proposes a novel storage-reduction strategy for NO x elimination throughout the operation of gas turbines.
研究领域:
环境工程
·
催化
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Xianmin Gong,Shijun Xu,Yiling He,Kaijun Wei,Quangang Chen,Qing Yuan,Yi He,Yi Fan,Xingtao Cheng
Metal-based composite coatings have been widely studied for their excellent properties. In order to improve the properties of nickel tungsten boron (Ni–W–B) matrix, Ni–W–B/PC coatings were prepared by electrodeposition in the presence of polydopamine functionalized VC (P–VC) and cerium oxide (CeO2) nanoparticles. The effect of cerium oxide content in the nanomaterials on the properties of Ni–W–B coatings was investigated. The results showed that the prepared coatings were dense, uniform, and crack-free, and the best performance was achieved at a cerium oxide content of 2 g/L. The addition of CeO2 nanoparticles can fill the tiny defects in the coating and optimize the coating structure. The addition of these two materials refines the size of the coating grains. In terms of coating performance, the corrosion resistance of the composite coating was enhanced with the addition of CeO2 at a certain P–VC concentration, and the total impedance of the composite coating was 24,030 Ω·cm2, which was 4.8 times higher than that of the Ni–W–B coating and 1.7 times higher than that of the Ni–W–B/P–VC coating. In addition, the hardness of the Ni–W–B/PC-2 composite coating reached 1033.93 HV at a CeO2 content of 2 g/L. The wear resistance of this composite coating was also optimized. Compared with the Ni–W–B/P–VC composite coating, the average coefficient of friction was reduced by 8.8%, and the wear resistance of the composite coating was further improved, which was attributed to the synergistic effect of the two materials. Moreover, the Ni–W–B/PC film has excellent hardness and corrosion resistance, which is promising for the application in harsh environments.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Yuanrong Zhang,Shuaitao Li,Xun Hu,Yanfen Fang,Ran Duan,Qifeng Chen
The construction of heterointerface in photocatalyst is an efficient approach to boost the separation and utilization efficiency of charge carriers, which is challenging and crucial in photocatalysis. Here, the construction of melon-structured carbon nitride/ N -doped WO 3 (MCN/NW x ) heterojunction photocatalyst was achieved by a method of prealcoholysis combined with thermal polymerization, where N -doping of WO 3 was achieved in-situ in the formation of heterojunction. The promoted charge separation efficiency was realized through the charge transfer from the conduction band of N -doped WO 3 to the valence band of the MCN. Density functional theory calculation results showed that the formation of the W–N heteroatom-interface led to the increase of density of states at the heterointerface and decrease of the band gap. The MCN/NW x nanocomposite featured a metallic band structure of the nanocomposite photocatalysts, resulting in the enhanced photocatalytic activity . The photocatalytic hydrogen evolution activity of the MCN/NW 2 was enhanced about 2.5 times than that of MCN. This research provides a novel insight into the construction of a novel heteroatom-junction that boosts the separation efficiency of charge carriers, and thereby improves the photocatalytic activity.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Weiwei Zhang,Ziwei Yuan,Ao Sun,Jiacheng Liu,Meng Xiao
In the current work, CeO 2 nanoparticles were embedded in Ni-W alloy matrix by pulse electrochemical deposition on copper substrate to optimize their microstructure and corrosion resistance. The effects of CeO 2 concentration and deposition time on Ni-W/CeO 2 composite coating were investigated for optimized structure and improved corrosion resistance. The composite coatings present nodular-like surfaces with dense and compact growth profiles, containing 63.03–67.88 wt% Ni, 28.73–31.87 wt% W and 0.25–8.24 wt% Ce. The content of incorporated CeO 2 in coatings increased with the increase of CeO 2 concentration in electrolyte. The addition of CeO 2 particles has refined the grains of the prepared coating. The surface became rougher with the extension of electrodeposition time. Ni-W/CeO 2 composite coating electrodeposited at 10 g L −1 CeO 2 for 60 min possessed the highest corrosion resistance, indicating enhanced corrosion protection and long-term stability. This premium coating can be applied in harsh environments to prolong the lifespan of machinery, equipment, and parts in marine, vehicle, aerospace, and chemical industries.
研究领域:
材料科学
·
电化学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2021
·
IF 3.171
Zhen He,Yu Zhou,Yuxin Wang,Pingyi Guo,Wensen Jiang,Caizhen Yao,Xin Shu
Several Ni-W-P-TiO 2 nanocomposite coatings were developed by the sol-enhanced electroplating method. The phase and elemental compositions of coatings were determined, and the surface and cross-section morphology were characterized. The mechanical and corrosion performance were systematically tested. The results revealed the addition of 5 ml·L −1 TiO 2 sol caused a compact coating surface, while higher concentrations of TiO 2 reduced the coating thickness and led to the inferior surface microstructure. The comparison in physiochemical properties of prepared coatings confirmed the superior performance of the Ni-W-P-TiO 2 nanocomposite coating at 5 ml·L −1 TiO 2 sol addition. Under this condition, the best mechanical properties were achieved when abrasive wear was the dominating wear-resistance mechanism, and the best corrosion resistance was obtained due to its smooth and compact surface microstructure.
研究领域:
材料科学
·
电化学
·
表面工程
✓ 已验证
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2025
·
IF 6.3
Zhengjie Chen,Chengchen Feng,Lin Jiang,Yujie Ke,Xiaoxue Han,Xinghai Liu
Smart window promises to enhance the building energy efficiency by dynamically controlling the indoor solar irradiation. In this study, a new thermochromic smart films for smart window applications were proposed. This film is based on polyvinylpyrrolidone (PVP)-coated tungsten-doped VO 2 (W-VO 2 ) and polyurethane acrylate (PUA). It is demonstrated that the PVP-coating technique plays a vital role in improving the optical properties of the film and the dispersion of W-VO 2 in PUA. The optimized 3D-printed Kirigami-structured films exhibit favorable tensile properties and improved optical properties. Furthermore, an innovative device has been developed to enable automatic adjustment of the film stretch rate in response to the angle of sunlight, ensuring the smart window's dynamic response to sunlight. The film's solar transmittance varies between 48.50 % and 78.56 % during stretching, accompanied by a solar modulation up to 30.05 %. In the indoor and outdoor demo experiments, the temperature drops by 5.2 °C and 4.8 °C, respectively, compared to a PUA film window. The work developed a new film for energy-efficient smart windows and provides a systematic technological route from materials synthesis, structural optimization, system digital control, to practical demo assessment, which promises to facilitate the development of VO 2 -based materials and energy-efficient windows.
研究领域:
材料科学
·
能源技术
·
建筑科技
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Xiaoqiang Xiong,Xiaodong Jing,Qianqian Zhao,Xi Yang,Qun Wang,Guoguo Tan,Tongyun Zhao,Huayang Gong
We successfully synthesized W-type/Spinel composite ferrites containing Co and Zn ions (W/ x S ( x = 0.5, 1, 2, 4, 8)) via “one-pot” sol-gel auto-combustion method. By setting up the comparison groups, the enhanced absorption performance of the composite ferrite materials compared with the single-phase material is clearly demonstrated. The “one pot” synthesis makes the co-existence of Co 2+ and Zn 2+ in the W-phase and S-phase lattices, resulting in composite ferrites with excellent soft magnetic and microwave absorption properties. SEM-EDS characterization revealed that Co and Zn were roughly evenly distributed in the W and S phase. Benefitting from the increased saturation magnetization and decreased magnetocrystalline anisotropy caused by Zn substitution, composite ferrites with excellent soft magnetic properties were obtained at appropriate Co/Zn ratios. W-type/Spinel composite ferrites exhibit tunable magnetic loss characteristics via changing the total Co/Zn molar ratios. On account of the broadband high magnetic loss characteristics, the well comprehensive microwave absorption properties were obtained. For W/0.5S, a minimum reflection loss of −70.46 dB (d = 1.76 mm) is obtained. For W/2S, a maximum effective absorption bandwidth of 10.67 GHz (d = 2.15 mm) is obtained. This work will provide new ideas for improving the microwave absorption performance of existing ferrite materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
Nano-Micro Letters
·
2023
·Vol. 15
·期 1
·1-19
·
IF 26.6
Wang Huawei,Gao Jialong,Chen Changli,Zhao Wei,Zhang Zihou,Li Dong,Chen Ying,Wang Chenyue,Zhu Cheng,Ke Xiaoxing,Pei Jiajing,Dong Juncai,Chen Qi,Jin Haibo,Chai Maorong,Li Yujing
A hybrid electrocatalyst consisting of PtNi-W alloy nanocrystals loaded on carbon surface with atomically dispersed W sites was realized.
Single-atomic W formed protonic acid sites and established an extended proton transport network at the catalyst surface.
Peak power density is enhanced by 64.4% compared to that with the commercial Pt/C catalyst in fuel cell as cathode at ultra-low loading of 0.05 mg Pt cm −2 .
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2023
·
IF 5.4
Jiamin Zhong,Shihong Zhang,Yi He,Yi Fan,Zhiyuan Li,Liping Yan,Huilian Zhou,Xinyu Cheng,Jinxue Song,Hongjie Li
In this paper, graphene oxide (GO) and furan epoxide graphene (FGO) were synthesized using graphene (G) as raw materials, and added to Ni-W-P coating as nano-reinforced materials, and various composite materials were successfully prepared by electroless plating , and the effects of G, GO and FGO as nano-reinforced materials on the surface morphology , wear resistance, corrosion resistance and microhardness of Ni-W-P coatings were studied and discussed. The experimental results show that the surface morphology of Ni-W-P-FGO coating is the most complete and dense, without obvious surface defects . In the friction test, Ni-W-P-FGO composite coating has the narrowest wear section, the wear amount is 311.617 μm 2 /N (minimum) and the average friction coefficient is the smallest (0.203) and it shows the best corrosion resistance in the corrosion resistance test, with the lowest corrosion current density (i corr = 0.7095 μA/cm 2 ) and the largest corrosion resistance (Rt = 66,554 Ω·cm 2 ).
研究领域:
材料科学
·
表面工程
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2024
·
IF 4.2
Dezhi Wang,Yanzhen Lu,Ye Gao,Shuai Ma,Xin Li,Zhuangzhi Wu
With the rapid development of the photovoltaic industry, tungsten alloys have been selected to replace the high‑carbon steel to fabricate the busbars for diamond wire saws due to their superior mechanical properties, and the La 2 O 3 doped tungsten alloy has been widely used. However, the yield of eligible W alloy wires is not very high due to serious wire breakage problems during the production process, especially in the solid-liquid mixing route. To discover the possible reason, the commonly produced lanthanum tungstate (La 30 W 17 O 96 ) in the solid-liquid mixing route has been systematically studied in the work, and its possible influence on the mechanical properties is also explored. It is found that the La 30 W 17 O 96 leads to the formation of brittle second phases at grain boundaries (GBs), which weakens the intergranular bonding, resulting in a significant decrease in the compressive strength of tungsten alloys, manifested as intergranular fracture. Transmission electron microscopy (TEM) analysis reveals that these second phases are consisted of polycrystalline La 6 W 2 O 15 , La 2 W 3 O 12 and amorphous states, and the La 30 W 17 O 96 can decompose into a more stable structure during sintering. This work highlights the destructive effect of La 30 W 17 O 96 on the intrinsic properties of tungsten alloys and provides a new perspective for solving the problem of tungsten wire breakage.
研究领域:
材料科学
·
冶金学
·
机械工程
✓ 已验证
DOI
高影响因子
Nanoscience and Nanotechnology Letters
·
2017
·Vol. 9
·期 6
·867-872
·
IF 1.889
Du Jingjing,Song Ya,Feng Yahui,Li Na,Tan Haihu,Li Changyun,Xu Lijian
Hierarchically nanoporous Ti–SiO2 particles were synthesized by dissolving template method, and the hierarchically nanoporous Au@Ti–SiO2 particles were further prepared by in-situ synthesis method using NaBH4 as reducing agent. The
components of the hierarchically nanoporous Au@Ti–SiO2 particles and Ni–W–Co alloy electrode were investigated by energy dispersive spectrometer (EDS). In addition, the hierarchically nanoporous Au@Ti–SiO2/Ni–W–Co composite electrode
was fabricated by the method of composite electrodeposition using hierarchically nanoporous Au@Ti–SiO2 particles as composite nanoparticles. Finally, the electrocatalytic activities for hydrogen evolution of different electrodes were investigated. Results showed that, the
mass fractions of Ni, W and Co were 62.78%, 11.75% and 25.47% respectively in the coating of Ni–W–Co alloy electrode. The mass fractions of Au and Ti were 0.94% and 4.21% respectively in the hierarchically nanoporous Au@Ti–SiO2 particles which indicated that the
Au nanoparticles were successfully doped into the hierarchically nanoporous Ti–SiO2 particles. And the results of electrocatalytic activity study showed that, Co and W have good electrocatalytic activity for hydrogen evolution, which can greatly improve the electrocatalytic
activity for hydrogen evolution. The electrocatalytic activity of Ni–W–Co alloy electrode was superior than that of Ni electrode and Ni-Walloy electrode. The electrocatalytic activity for hydrogen evolution of hierarchically nanoporous Au@Ti–SiO2/Ni–W–Co
composite electrode was improved because of adding Au@Ti–SiO2 and reached the optimal value when the concentration of nanoporous Au@Ti–SiO2 particles was 1.6 g/L.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Science China-Materials
·
2023
·Vol. 66
·期 8
·3213-3222
·
IF 8.1
Wen Zihao,Meng Hong,Jiang Shengda,Tang Zhongyu,Liu Yiwen,Chu Yanhui
Developing superior oxidation resistance of high-entropy diborides is critical for extending their potential applications in harsh environments. Herein, we developed non-equimolar (Hf,Zr,Ta,W)B 2 high-entropy diborides with superior oxidation resistance by adjusting W contents for the first time. The as-fabricated (Hf 0.28 Zr 0.28 Ta 0.28 W 0.15 )B 2 samples are predicted to possess superior oxidation resistance at 1473–1773 K through the oxidation depth quantitative analysis obtained by machine learning, which is attributed to the reason that the moderate WO 3 can effectively inhibit the volatilization of B 2 O 3 . Furthermore, a four-layered structure is found in the generated product layers at 1773 K, which is due to the preferential oxidation of Hf and Zr elements at low oxygen partial pressure and the different diffusion activation energies of oxide products. The preferential oxidation of Hf and Zr elements is further demonstrated by the computational phase stability diagrams, and oxygen adsorption energies and charge transfer between oxygen atoms and different metal adsorption sites via first-principles calculations. Such superior performance endows (Hf 0.28 Zr 0.28 Ta 0.28 W 0.15 )B 2 with potential applications as ultrahigh-temperature structural materials.
研究领域:
材料科学
·
高温材料
·
计算材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）