CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Nidu Wang,Jianghua Huang,Li Chen,Yujie Wang,Dongguang Wang,Shuying Gao,Zhouhao Zhu,Baoying Guo,Hengcong Tao
Constructing 2D geometric structure and optimize electronic structure of transition metal oxide have been demonstrated to be effective strategy to reinforce its electrochemical dinitrogen reduction reaction (NRR) performances. But combining these two advantages into metal oxide based electrocatalyst simultaneously to achieve synergic effects remains one technological challenge but very significant. Here, a self-sacrificing template coupling with Fe doped strategy were proposed to optimize the geometric and electronic structure of Zr-based electrocatalyst. Experimental results revealed that the optimal sample 2Fe-YSZ was endowed with uniform 2D heterostructures, rich oxygen vacancy and increased electronic density, which induced by the framework Fe element. These traits thus confer the 2Fe-YSZ produced through extensive exposure to extra active sites, significantly boosting the absorption and activation of N 2 molecules. And the DFT calculation further validates the promotive effect of framework Fe. As expected, in the electrocatalytic NRR test, 2Fe-YSZ demonstrated high Faradaic efficiency (38.89 %) and NH 3 yield rate (19.58 μg h −1 mg −1 ) at − 0.5 V in 0.1 M HCl, comparable to most Zr-based electrocatalytic materials for ambient NRR. This geometric/electronic structure engineering strategy could provide an idea the rational design of efficient NRR catalysts.
研究领域:
材料科学
·
电催化
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Bowen Zhang,Junyi Gong,Keyan Wei,Shuai Yue,Cairong Jiang,Jianjun Ma
Aqueous tape calendering offers the advantage of a simple fabrication process, inexpensive equipment, and environmental friendliness. Polyvinyl alcohol (PVA), as a polymer, is a conventional binder for aqueous tape calendering. In this innovative work, we aim to achieve a suitable process for tape calendering, by studying mechanical properties of the PVA polymer film with a series of plasticizers . The results show that the elongation at break of the PVA film reaches a maximum of 828.26%, using a triple plasticizer of glycerol, polyethylene glycol (PEG) 200, and PEG 400. With an optimized ratio of the binder to the plasticizer, a YSZ sheet with a relative density of 98% and a conductivity of 0.043 S cm −1 at 800 °C is obtained by sintering at 1400 °C, demonstrating comparable performance to those of the YSZ electrolytes by dry pressing. SEM reveals that the sintered YSZ body is dense, and has no visible open and closed pores. The mechanical properties characterization of the PVA polymer film adopted in this paper has instructive significant instruction for tape calendering and tape casting methods.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Xiaodong Wei,Guoliang Hou,Yulong An,Pan Yang,Xiaoqin Zhao,Huidi Zhou,Jianmin Chen
6-8 wt% yttria-stabilized zirconia (YSZ) has been widely employed as thermal barrier coating (TBC) to protect the high-temperature components of aero-engine and gas-turbine. However, the phase transition and sintering densification at high temperature seriously limit its application above 1200 °C. On account of this, CeO 2 and Sc 2 O 3 were doped into the YSZ by solid-state reaction sintering method in this paper. The effects of doping on the crystal structure, phase transition behavior and sintering resistance were investigated on the basis of XRD, Raman and FESEM , and the evolution of thermal properties of the ceramics was also analyzed. The results indicated that doped CeO 2 increases the cell volume and tetragonal degree, but doped Sc 2 O 3 was opposite. Co-doping caused not only significant difference in atomic mass and radius but also the formation of a large number of oxygen vacancies in the ceramics. Therefore, CeScYSZ showed the lowest thermal conductivity (1.53 W‧m −1 ‧K −1 ), which was about 23% lower than that of YSZ (2.00 W‧m −1 ‧K −1 ). More importantly, the oxygen vacancy also effectively stabilized the octet lattice, while the increase of lattice energy caused by Sc-O bond made it difficult for ions to misplace, which finally well prevented the transformation from t phase to m phase. There was no detrimental m -ZrO 2 phase formation in the CeScYSZ after 120 h at 1500 °C. Besides, Co-doping could simultaneously overcome the poor sintering resistance caused by single CeO 2 doping and the lower thermal expansion coefficient caused by single Sc 2 O 3 doping, thus the CeScYSZ should be an ideal long-acting thermal protection material at higher temperatures.
研究领域:
材料科学
·
高温材料
·
陶瓷材料
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2019
·Vol. 25
·期 12
·6043-6050
·
IF 2.289
Diao Quan,Zhang Xiaomei,Li Jie,Yin Yuna,Jiao Mingli,Cao Jian,Su Chaohua,Yang Kai
The phenol-formaldehyde (PF) resin microspheres were firstly used as the template in the sensing electrode (SE) preparation process of sensors based on Y 2 O 3 stabilized ZrO 2 (YSZ). The PF resin microspheres were synthesized by a facile hydrothermal method. The high char yield and the few morphological changes of PF resin microspheres before and after sintering at 900 °C indicated the perfect thermal stability at high temperature. The sensors using MnCr 2 O 4 admixed with various contents PF microspheres (0 wt%, 5 wt%, 10 wt%, and 20 wt%) were fabricated and their sensing performances on NO 2 gas were also investigated. The sensor with sensing electrode prepared by MnCr 2 O 4 with 10 wt% PF showed the best NO 2 sensing performance with a response of 110.8 mV to 100 ppm NO 2 as well as the higher sensitivity (87.4 mV/decade) with the NO 2 concentration ranging from 10 to 500 ppm at 550 °C. According to the mixed-potential mechanism, the porous electrode is good for gas penetration, so the gas can easily reach the MnCr 2 O 4 /YSZ/gas triple phase boundary (TPB) to participate in the electrochemical reactions. Additionally, the sensor exhibited excellent selectivity and repeatability, which indicated its potential application in the NO 2 detection.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Nan Zhang,Qingkui Li,Kaijun Yang,Hailong Wang,Jinpeng Zhu,Zhuang Ma,Lihong Gao,Yanbo Liu,Yang Liu,Jilin He
Core-shell structured cermet powders with thermal conductivity anisotropy have been brought into focus because they have a great potential application as the horizontal thermal diffusion layer material in multilayer thermal protective coating (TPC). In this contribution, core-shell structured YSZ@Cu cermet powders were fabricated by electroless deposition (ED) of Cu on yttria-stabilised zirconia (YSZ) powder. The surface of YSZ powder was uniformly coated with a thin Cu shell of approximately 2 μm. Through X-ray photoelectron spectra (XPS) analysis, it was found that trace CuO and Cu 2 O oxides formed on the surface of Cu shell. Results of thermal spraying adaptability analysis show the flowability of core-shell structured YSZ@Cu cermet powder improved to 56.8 s/50 g, which conforms better to the basic requirements of thermal spraying material. By differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) tests, the YSZ@Cu powder had good thermal stability. In particular, between 25 and 500 °C, the anisotropy thermal conductivity rose higher than 1.8 and it remained stable at approximately 1.6 with temperature as high as 900 °C. All these features promise it a high-performance thermal conductivity anisotropy material.
研究领域:
材料科学
·
热管理技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Xingya Zhu,Wenting He,Yiqian Guo,Liangliang Wei,Dongrui Liu,Hongbo Guo,Hui Peng
Calcium-magnesium-alumina-silicate (CMAS) deposits significantly accelerate the degradation of thermal barrier coatings (TBCs) in advanced aeroengines, thereby posing a substantial threat to aviation safety. In this study, (Gd 0.2 Y 0.8 ) 3 Al 5 O 12 (GYAG)/YSZ double-ceramic-layer thermal barrier coatings (TBCs), comprising dense GYAG on top and columnar YSZ beneath, were fabricated via plasma spray-physical vapor deposition (PS-PVD) in a single-step process to mitigate CMAS attack. High-temperature exposure tests at 1250 °C demonstrated the excellent phase stability of GYAG coating and interface stability of GYAG/YSZ coating. The interactions between CMAS and GYAG/YSZ coatings were investigated. Results showed that CMAS melt infiltration was suppressed. GYAG coating reacted rapidly with CMAS to crystallize apatite, garnet and anorthite phases with high-melting-point. These crystalline phases are alternatively distributed and collectively inhibit CMAS infiltration. The doping of Gd in GYAG coating facilitated precipitation of apatite, which is crucial for CMAS resistance enhancement.
研究领域:
材料科学
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表面工程
·
航空发动机
·
高温材料
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涂层技术
·
无机非金属材料
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES COMMUNICATIONS
·
2017
·
IF 0
Ying Bai,Xue Mao,Jun Song,Xia Yin,Jianyong Yu,Bin Ding
Study of high-efficiency and free secondary pollution TiO 2 based photocatalyst has become the one of the most urgent problems in improving the decolorization effect of the waste water from printing and dyeing mill. In this work, a novel self-standing Ag 2 O@YSZ-TiO 2 p-n nanoheterojunction nanofibrous membrane was designed for ultraviolet (UV) photocatalyst by a facile combination of electrospinning technique and precipitation process. Moreover, the UV photocatalytic performance of the flexible AZT p-n nanoheterojuction nanofibrous membranes with a band gap energy of 2.89 eV and good reversibility of 5 cycles, was superior to the commercial catalyst P25 for photocatalytic degradation of methylene blue. Furthermore, the photocatalytic mechanism of the flexible Ag 2 O@YSZ-TiO 2 nanofibrous photocatalyst was proposed by the electron transition in Ag 2 O/TiO 2 p-n nanoheterojunction, which showed a new insight to development of flexible and high-efficiency nanoheterojunction nanocrystalline photocatalytic membranes.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2016
·
IF 1.34
Shan-guang SONG,Shi-lei TAN,Xiao-xiao QI,Wei WANG,Li-li WANG
YSZ/(Ni, Al) composite coatings were deposited on Inconel600 superalloy with ball peening (BP) and without (non BP) treatment using the electrophoretic deposition (EPD) technique, followed by vacuum sintering method. The structures and phase evolution of the coatings were studied with X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS). The relation between microstructures and properties of the BPs-coated samples was discussed. The results show that the adhesion strength and gain mass of the BPs-coated samples with isothermal oxidation at 1100 °C for 100 h are 3.3 N and 0.00817 mg/cm 2 , respectively, while those of the non-BPs-coated sample are 2.6 N and 0.00559 mg/cm 2 , respectively. The EDS mapping analysis indicates that an obvious outward diffusion of Cr from the substrate to BPs coated samples occurs after isothermal oxidation. The BPs-coated sample shows the superior adhesion and oxidation resistance compared with non-BPs-coated samples.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2017
·Vol. 17
·期 4
·2613-2619
·
IF 1.483
Feng Zhao,Qi Jianqi,Huang Zhangyi,Xie Xiumin,Wei Nian,Lu Tiecheng
Single-phase nano-crystalline yttria-stabilized zirconia (YSZ) powder was prepared by co-precipitation method using zirconium oxychloride (ZrOCl2 · 8H2O) and yttrium nitrate (Y(NO3)3 · 6H2O) as raw materials and ammonium
bicarbonate (NH4HCO3) and liquor ammonia (NH4OH) as the precipitators. In order to get the powder with favorable dispersibility, polyethylene glycol (PEG, HO(CH2CH2O)
n
H) with different molecular weights and amounts was
used as a dispersant agent in the synthesis process and its effects on the YSZ powder was investigated. The scanning electron micrograph (SEM) images showed that the degree of agglomeration and the mean crystal size of YSZ powder varied with the amount and the molecular weight of PEG. The
appropriate amount and molecular weight of PEG were given by comparing the dispersibility and crystal size distribution of powders. In the process, one also could find that the promotion of dispersion was insensitive to the molecular weight, and all PEG (400–2000) can exert an ability
to reduce the agglomeration. The proper amount of PEG400, PEG600, PEG1000, PEG2000 was 3 wt%, 3 wt%, 2 wt%, 2 wt%, respectively. The transmission electric microscope studies in conjunction with the XRD analyzes verified the low degree of agglomeration and the size of YSZ powder varied between
10~20 nm.
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
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Yuan Li,Xu Zhang,Yanting Tian,Xueying Wu,Lei Wang,Jiping Zhu
The electrochemical performance of Ca 3 Co 4 O 9+δ (CCO) oxygen electrode with La 0.6 Sr 0.4 FeO 3-δ (LSF) interlayer in YSZ-based reversible solid oxide cells (RSOCs) was investigated in present work. Results proved that CCO oxygen electrode with LSF interlayer had a superior stability under alternating anodic and cathodic polarization . Both the polarization resistance and overpotential of the CCO electrode with LSF interlayer were significantly reduced compared to that with Ce 0.9 Gd 0.1 O 1.95 (GDC) interlayer, which confirmed the improvement of the redox reactivity of the oxygen electrode. The maximum power density of Ni-YSZ/YSZ/LSF/CCO fuel cell was 1276 mW cm −2 at 800 °C. An electrolysis current density of 1695 mA cm −2 was achieved at 1.5 V and 50% H 2 O. The hydrogen production rate of the electrolysis cell improved by 2 times than that with the GDC interlayer. Results made clear reliability of LSF as an interlayer in YSZ-based RSOCs.
研究领域:
材料科学
·
能源工程
·
电化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yansong Liu,Yongsheng Liu,Yunlei Lv,Yixin Dong,Yejie Cao,Yanxia Du
Multiscale porous yttria-stabilized zirconia (YSZ) ceramics were fabricated via digital light processing (DLP), employing polymethyl methacrylate (PMMA) microspheres as a pore-forming agent. The evolution of microstructure and properties of ceramics, including compressive strength and thermal conductivity, was systematically investigated. The results showed that the porosity and density of the ceramics were 56.43-3.95% and 2.63-5.82 g/cm 3 , respectively, within the sintering temperature range of 1200-1600 °C. Correspondingly, the compressive strength and thermal conductivity of ceramics were 71.00-315.95 MPa and 0.51-2.68 W/(m·K), respectively. At lower sintering temperatures (≤ 1400 °C), multiscale pores formed inside the ceramics due to the decomposition of photosensitive resin and PMMA microspheres. The existence of multiscale pores further reduced the thermal conductivity by an average of 46.08%. In contrast, at higher sintering temperatures (≥ 1500 °C), the density and the mechanical properties of ceramics were significantly improved. In particular, the increase in porosity depended primarily on the increase in pore-forming agent content when the submicron pores disappeared.
研究领域:
材料科学
·
陶瓷
·
增材制造
·
微观结构分析
·
力学性能
·
热学性能
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2023
·
IF 5.3
Yixue Yang,Qiang Hu,Guimin Zhang,Xun Xie,Yuxin Liu,Liming Zhou,Kejing Wu,Houfang Lu,Bin Liang
Supported Ni on yttria stabilized zirconia (YSZ) is the most widely used anode for a solid oxide fuel cell (SOFC), where Ni particles are easy to agglomerate at a high temperature of 1400 °C and reductive hydrothermal environments. In this study, Ni particles are successfully dispersed on YSZ through strong interaction between Ni and SiO2. The thin and amorphous SiO2 films, grown by low-temperature chemical vapor deposition (CVD), become spherical particles of nickel silicates uniformly dispersed on the YSZ skeleton after sintering at 1400 °C. Also, the SiO2-anchored Ni particles supported on YSZ (Ni/YSZ-SiO2) are obtained via direct reduction. The electrochemical performance of the Ni/YSZ-SiO2 anode shows a higher power density of approximately 18% than an unmodified Ni/YSZ anode, which resulted from the longer effective TPB area assigned to the highly dispersed Ni particles. The microstructure containing SiO2-anchored Ni particles exhibits high stability under testing and reductive hydrothermal conditions. Accordingly, the method of growing a SiO2 layer via low-temperature CVD is considered as a probable route for the preparation of the Ni/YSZ electrode material with a well-defined microstructure.
研究领域:
材料科学
·
能源工程
✓ 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）