JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
·
2024
·
IF 2.5
Zhangqiao Zhou,Qi Li,Meiqi Wen,Ruilin Zhou,Xian Wang
The coatings play a crucial role in enhancing the performance of soft magnetic composites (SMCs). This study aims to create coatings for Fe-Ni-Mo SMCs using polysilazane (PSZ) as the precursor. The transformation mechanism of the PSZ/resin mixture is studied by analyzing functional groups and chemical bonds at various temperatures. During the self-polymerization process of PSZ at 350 °C, N–H, C = C–H, Si-H bonds, –CH 3 , and Si-CH 3 groups undergo crosslinking reactions to form C–C and Si-N bonds. When the temperature reaches 600 °C, PSZ polymer cleavage, O-Si-C and Si-N-Si bond dominate in the coating. Additionally, PSZ can effectively enhance the heat resistance of silicone resin through its reaction with Si-OH groups, which has a significant effect on increasing the resistivity of SMCs and reducing high frequency core loss. Optimizing the PSZ content to 0.5 wt% enhances the magnetic properties of Fe-Ni-Mo SMCs, resulting in a μ e of 74.0 at 100 kHz and a corresponding core loss ( P cv ) of 547.7 mW/cm 3 at 100 kHz/100 mT. The findings provide valuable insights for optimizing PSZ content to improve magnetic performance in SMCs.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Mao Zhou,Ruizhuo Ouyang,Yuhao Li,Yuqing Miao
3D microspheres from the in situ synthesis, growth and organization of Ni-Mo-S nanoparticles (NPs) on porous Ti plate were obtained through a typical hydrothermal method . The Ni-Mo-S/Ti electrode exhibited excellent electrocatalytic performance for hydrogen evolution reaction (HER) in strong acid electrolyte. HER occurs at the relatively low onset potential of −4 mV with high current of 10 mA/cm 2 at low overpotential of 30 mV in 0.5 M H 2 SO 4 . Furthermore, the Ni-Mo-S/Ti exhibited excellent electrocatalytic stability over an extended period of 60000 s without obvious current decrease observed. The multinary composition , 3D microsphere-like structure from nanoparticles, porous supporting substrate, the good conductivity of Ti and good electron transfer between electrode and catalysts, all of them are combined to contribute to the high HER electrocatalytic activity of the Ni-Mo-S/Ti. The good stability comes from the stability of catalysts and Ti themselves, and the tight contact between catalysts and supporting electrode.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Xinkuai He,Zhousi Hu,Ruqing Guo,Yiren Li,Luye Wu
One of the most critical challenges in the field of hydrogen production through water electrolysis technique is the design, development and manufacture of electrode materials with low-cost, highly electrocatalytic activity and stability. We employ the galvanostatic deposition technique to prepare the honeycomb structured Co−Ni−Mo alloy electrocatalysts from ethylene glycol (EG) system, in which the honeycomb structure presents highly intrinsic electrocatalytic activity for hydrogen evolution reaction (HER). The electrochemical behavior of Co 2+ , Ni 2+ and Mo 6+ reductions and the co-deposition behavior of Co-Ni, Co-Mo, Ni-Mo and Co-Ni-Mo alloys is reported. Benefiting from the composition engineering by alloying with Mo atoms, as well as the simultaneous existence of a suitable honeycomb structure, these Co 58 Ni 23 Mo 19 deposits obtained at an optimal parameter exhibit prominent electrocatalytic durability and activity with a η 10 of 51 mV for HER in a 1.0 M KOH. More importantly, the formation model of the honeycomb structured Co-Ni-Mo alloy deposits is proposed. This work suggests a simple and economical method for the preparation of a 3-dimensional catalytic electrode.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 15
·3633
·
IF 4.2
Shihao You,Jing Di,Tao Zhang,Yufeng Chen,Ruiqin Yang,Yesong Gao,Yin Li,Xikun Gai
To explore advanced oxidation catalysts, peroxymonosulfate (PMS) activation by Co-Ni-Mo/carbon nanotube (CNT) composite catalysts was investigated. A compound of NiCo2S4, MoS2, and CNTs was successfully prepared using a simple one-pot hydrothermal method. The results revealed that the activation of PMS by Co-Ni-Mo/CNT yielded an exceptional Rhodamine B decolorization efficiency of 99% within 20 min for the Rhodamine B solution. The degradation rate of Co-Ni-Mo/CNT was 4.5 times higher than that of Ni-Mo/CNT or Co-Mo/CNT, and 1.9 times as much than that of Co-Ni/CNT. Additionally, radical quenching experiments revealed that the principal active groups were1O2, surface-bound SO4•−, and •OH radicals. Furthermore, the catalyst exhibited low metal ion leaching and favorable stability. Mechanism studies revealed that Mo4+on the surface of MoS2participated in the oxidation of PMS and the transformation of Co3+/Co2+and Ni3+/Ni2+. The synergism between MoS2and NiCo2S4reduces the charge transfer resistance between the catalyst and solution interface, thus accelerating the reaction rate. Interconnected structures composed of metal sulfides and CNTs can also enhance the electron transfer process and afford sufficient active reaction sites. Our work provides a further understanding of the design of multi-metal sulfides for wastewater treatment.
研究领域:
环境科学
·
材料科学
·
化学工程
·
水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2023
·
IF 5.5
Yiming Hu,Wenchang Li,Lin Li,Jinhong Wu,Shizhan Sheng,Huihua Wang
Developing impressive and low-cost electrocatalysts for hydrogen evolution reaction (HER) is the key for large-scale application of hydrogen production . Herein, a series of non-noble Ni-Mo-P coatings were achieved in the ChCl-EG electrolyte through a facile electrodeposition method under different experimental conditions. The 0.6Ni-0.21Mo-0.066 P coating fabricated at 30 mAcm −2 exhibits an impressive HER catalytic activity for delivering a current density of 10 mAcm −2 at only an overpotential of 57 mV in 1 M KOH electrolyte, ascribing to the synergistic effect of Ni, Mo and P elements and regulated electron structures, as well as large electrochemical active areas produced in the ChCl-EG electrolyte. Moreover, the 0.6Ni-0.21Mo-0.066 P coating demonstrates a pronounced electrocatalytic stability toward HER in the long-term test due to its obviously small inners tress. The outstanding HER performance of 0.6Ni-0.21Mo-0.066 P coating, along with facile and scalable fabrication method, highlights the potential application in the field of electrocatalytic water splitting.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2020
·
IF 8.821
Sen Xue,Weimin Zhang,Qing Zhang,Jinhong Du,Hui-Ming Cheng,Wencai Ren
Water electrolysis in alkaline electrolyte is a promising technology for large-scale hydrogen production . However, the hydrogen evolution reaction (HER) is quite sluggish in alkaline electrolyte. Developing highly active and stable non-noble metal electrocatalysts is highly desired to solve this issue but of great challenge. Here, we report a catalyst constructed by Ni–Mo–N nanoparticles decorated on nitrogen-doped reduced graphene oxide (Ni–Mo–N/NG). Due to the high intrinsic electrocatalytic activity of heterostructured Ni–Mo–N nanoparticles and synergistic effects between the nanoparticles and graphene, the catalyst exhibits excellent HER electrocatalytic activity with zero onset potential and 46.6 and 159.8 mV overpotentials for 10 and 100 mA cm −2 , respectively, in alkaline electrolyte at low mass loading. Such electrocatalytic performances exceed those of many reported non-noble metal catalysts even with much higher mass loading, demonstrating the great potential of our Ni–Mo–N/NG catalysts for hydrogen production by water electrolysis.
研究领域:
材料科学
·
电化学
·
催化
·
能源材料
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Sijie Liu,Renda Wang,Ping Yu,Kun Liang,Li Wang,Mengyu Gao,Yang Si,Chuang Zhu,Fangfang Ge,Bingsheng Li
In this study, molybdenum (Mo) coatings were deposited on 304 stainless steel (304SS) plates using magnetron sputtering. Subsequently, the samples were annealed at 800 °C under vacuum for varying durations to enhance adhesion strength and thermal stability. Immersion tests were conducted at 700 °C for up to 800 h. After 200 h of immersion, the weight loss of the annealed Mo-coated 304SS was significantly reduced from approximately 11 mg/cm 2 to about 0.44 mg/cm 2 . The Mo-enriched layer effectively suppressed the outward diffusion of alloy elements and facilitated the formation of Cr 2 O 3 by trapping Cr in the interdiffusion layer. Additionally, the Mo 3 Fe 3 O phase formed on the coating surface via diffusion reaction exhibited certain corrosion-resistant properties. Obvious interfaces emerged within the interdiffusion layer, and their formation mechanisms were analyzed. After four thermal cycles (with a 200-h interval), partial delamination of the Mo-enriched layer in the annealed Mo-coated 304SS was observed. This may have resulted from the substantial growth stress of Cr 2 O 3 and the significant mismatch in thermal expansion coefficient between Mo coating and 304SS.
研究领域:
材料科学
·
腐蚀工程
·
表面工程
·
可再生能源
·
冶金学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Panpan Wang,Wenquan Cui,Huan Wang,Weijia An,Shuo Zhao,Hongxia Guo
Hydrogen production by photoelectrocatalytic (PEC) decomposition of water is a promising pathway for green hydrogen acquisition. The construction of highly efficient and low-cost HER catalyst is the key to the commercialization of hydrogen production. Ni–Mo–B/TNTs (titanium dioxide nanotubes) nanocatalysts were prepared by a one-step electrodeposition method. Due to the synergistic effect of the nonmetallic B and the transition metal Ni–Mo, the composite photoelectrode exhibited a low overpotential and high stability in an alkaline electrolyte. Density functional theory (DFT) calculations confirmed that the ternary catalyst Ni–Mo–B/TNTs significantly optimized the adsorbed hydrogen intermediates, lowered the free-energy barriers of hydrogen adsorption, and facilitated the desorption of H 2 , which resulted in an enhancement of HER activity.
研究领域:
材料科学
·
催化
·
纳米技术
·
氢能
·
电化学
·
理论化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 19
·9228-9235
·
IF 9.931
Teng Wang,Rumei Jin,Xiuqi Wu,Jie Zheng,Xingguo Li,Kostya Ostrikov
A highly efficient Ni–Mo bimetallic catalyst for the hydrogen evolution reaction can be obtained from a molybdate incorporated Ni-MOF by thermal decomposition in NH3. The catalyst is composed of crystalline Ni nanoparticles doped with amorphous low valence Mo oxide encapsulated in thin N-doped carbon layers, showing excellent HER performance, featuring a very low overpotential for the HER (η20 = 58 mV), low Tafel slope (57 mV dec−1) and excellent long term stability. The catalyst apparently outperforms N-doped carbon encapsulated Ni catalysts without Mo doping, emphasizing the critical synergetic effect of Mo doping and the surface N-doped carbon thin layer on promoting the performance of Ni based HER catalysts.
研究领域:
材料科学
·
催化
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Huazhen Cao,Zhizhou Yue,Huibin Zhang,Guangya Hou,Yiping Tang,Guoqu Zheng
Electrodeposition of refractory metals is a challenging issue in the electroplating field owing to their low reduction potential. Electrodeposition of molybdenum in MoCl 5 -BMIMPF 6 by a cyclic scanning regime was introduced in this paper. Ni-Mo and Pt/Ni-Mo deposits were prepared by underpotential deposition to induce the bulk deposition of molybdenum. The coatings were observed and characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS). The electrochemical behavior of metallic molybdenum in ionic liquids was studied by cyclic voltammetry and chronoamperometry. The results show that the initial nucleation/growth process of molybdenum in MoCl 5 -BMIMPF 6 follows three-dimensional progressive nucleation with diffusion-controlled growth, and the nucleation rate of molybdenum is slow in the ionic liquid system. The effects of supporting electrolytes and sputtering Pt/Ni electrodes were particularly studied. A yellow-brown uniform coating with more refined crystalline grains was obtained on the Ni surface by the addition of NaF due to its positive role in the mass transfer process and good complexing actions that promote nucleation. A gray-white coating with metallic luster was successfully fabricated on the surface of sputtered Pt/Ni because the substrate with a high work function is benign to molybdenum growth at a lower temperature and more positive potentials.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ACS Catalysis
·
2022
·
IF 13.7
Xiangze Du,Xiaomei Lei,Linyuan Zhou,Yong Peng,Yan Zeng,Huiru Yang,Dan Li,Changwei Hu,Hermenegildo Garcia
In the context of the preparation of liquid fuels derived from biomass with zero CO2 footprint, fatty acids appear as suitable feedstocks. However, reduction of carboxylic acid groups usually requires harsh reaction conditions and the development of efficient solid catalysts. Herein, bimetallic Ni–Mo nitrides have been obtained by a procedure not involving nitridation of the corresponding oxide, but reductive decomposition of the tris(ethylenediamine)nickel molybdate at temperatures between 550 and 700 °C. Successful formation of the Ni3Mo3N nitride is confirmed by X-ray diffraction. Ni3Mo3N samples are found to be efficient catalysts for the hydrodeoxygenation of palmitic acid to C15/C16 alkanes with a combined selectivity over 90 and 100% palmitic acid conversion and higher activity than analogous Ni–Mo nitrides obtained by NH3 nitridation of NiMoO4. Ni3Mo3N is found recyclable with only a slight decay in the catalytic activity upon consecutive reuses attributable to the neutralization of acid sites. The present results show an opportunity that bimetallic nitrides offer as robust advanced solid catalysts for reactions of biomass conversion requiring harsh conditions.
研究领域:
化学工程
·
催化材料
·
可再生资源转化
✓ 已验证
DOI
高影响因子
JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
·
2023
·Vol. 34
·期 7
·987-991
·
IF 1.4
Su Xiao-Ping,Zhao Le,Wang Xiang-Tong,Wang Zhao,Wang Zhi-Chao,Shen Tao,Zhang Ping
Different Al2O3 carriers were synthesized by co-precipitation and sol-gel method. From them, 4%NiO-20%MoO3/Al2O3 catalysts were prepared by incipient wetness impregnation. The catalysts were characterized by X-ray diffraction analysis (XRD), N2 adsorption-desorption, NH3 temperature programmed desorption (TPD) and H2-temperature programmed reduction (TPR) and subsequently used for selective hydrogenation of naphthalene to high-value tetralin. The results showed that Ni-Mo/so-ge Al2O3 (900) exhibited better catalytic performance than Ni Mo/commercial Al2O3, achieving 99.56% naphthalene conversion and 99.43% tetralin selectivity.
研究领域:
催化化学
·
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）