CERAMICS INTERNATIONAL
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2022
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IF 5.532
Chenyang Xu,Baosong Li,Zhengwei Liu,Ziwei Yuan,Zhen Zhang,Shengquan Chen
Nanocrystalline Ni–Mo and Ni–Mo–ZrO 2 coatings were designed and successfully fabricated via electrodeposition process in direct current mode. Impacts of molybdate and ZrO 2 nanoparticles , cathodic current density ( i c ) on surface, structure and performance of Ni–Mo alloy were analyzed. Electrochemical behaviors were evaluated by electrochemical impedance method in sodium chloride solution. A more compact and consistent surface morphology was prepared by introducing molybdate in nickel. Grain sizes of Ni–Mo alloy decreased as molybdate increased from 2 to 6 g L −1 , and enlarged as i c increased. After incorporation of ZrO 2 , the grains initially decreased to 12 nm and later increased to 18 nm. The structure of the deposit is a face-centered cubic phase. With the increase of molybdate content, the preferential Ni (220) crystal plane was changed to oriented (111) plane. The Ni–Mo alloy comprises 91 wt% Ni and 5.4 wt% Mo. R a of Ni–Mo–ZrO 2 was 73 ± 4 nm. Ni–Mo alloys obtained at 20 mA cm −2 and 2 g L −1 molybdate possess the best corrosion-resistant behavior. Incorporation of ZrO 2 can strengthen electrochemical stability and anti-wear behavior of Ni–Mo alloy. The inclusion of ZrO 2 refined the grain size from 18 to 12 nm. The Ni–Mo/ZrO 2 coatings electrodeposited under 2–4 g L −1 Na 2 MoO 4 ·2H 2 O, 20–40 mA cm −2 , 10–15 g L −1 ZrO 2 have excellent wear and corrosion resistance.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
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2023
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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
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电化学
✓ 已验证
DOI
高影响因子
SOLID STATE SCIENCES
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2022
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IF 3.752
Shijun Xu,Yi He,Siming Yan,Teng He,Hongjie Li,Xiao Guo,Yi Fan
Hydrogen energy is the most promising clean energy at present and hydrogen production by electrocatalytic water splitting is the frontier technology of alternative energy in the future. Herein, the Ni–Mo alloy supported with nickel foam (NF) was prepared by hydrogen reduction strategy at high temperature. The catalytic activity and stability of NiMo@NF-x catalyst (x stands for temperature) with multistage (sheet/particle) array structure were studied under different temperatures. The performance of the catalyst was evaluated by contact angle and related electrochemical characterization. It was found that the surface of NiMo@NF-550 catalyst prepared at 550 °C had superhydrophilic and superaerophobic properties, which contributed to the deactivation of bubbles from the surface of the electrode and improved the efficiency of the catalytic reaction. Moreover, the multi-stage array structure of sheet/particle will form a greater specific surface area than the plain sheet structure, offering more reaction sites. These results indicate that the self-supported superhydrophilic and superaerophobic Ni–Mo catalysts have excellent electrocatalytic hydrogen evolution ability.
研究领域:
材料科学
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能源科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2025
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IF 8.3
Xinkuai He,Genfa Zeng,Jingjing Yang,Yiren Li,Luye Wu
The electrochemical reduction behavior in the preparation of Ni–Mo alloy catalysts using benzyl alcohol (BA) and ethylene glycol (EG) mixed solvents is studied via CV. These studies indicate that the mechanism of Ni–Mo co-deposition corresponds to a typical induced co-deposition mechanism, in which Ni 2+ can facilitate the Mo 6+ reduction while Mo 6+ can suppress the Ni 2+ reduction in the mixed solvents. SEM micrographs reveal that these Ni–Mo alloy catalysts exhibit dense structures composed of 'hillock'-shaped granules, and the size of these granules can be tuned by adjusting the Mo content. XRD pattern reveals that the Ni–Mo catalysts present a nanocrystalline structure with an average crystallite size of 48.7 nm. The experimental data demonstrate that increasing the Mo content in the Ni–Mo alloy catalyst from 5.36 to 11.62 wt% significantly enhances the HER performance. Particularly, the catalyst containing 11.62 wt% Mo demonstrates superior catalytic efficiency in 1 M KOH, requiring an overpotential of merely 58 mV to reach a current density of 10 mA cm −2 .
研究领域:
电化学
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催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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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
Energy Technology
·
2024
·
IF 3.6
Xueli Zhang,Shan Hu,Fangyuan Zhang,Shuchen Xing,Huilin Hu,Jinhua Ye,Defa Wang
As a promising technology to mitigate global carbon emissions, photothermal catalytic CO 2 reduction remains a great challenge in increasing the conversion efficiency and regulating the product selectivity. Herein, a series of phase-separated Ni–Mo alloy catalysts for efficient photothermal CO 2 reduction with tunable CO selectivity is reported. With the increase of Mo content, the evolution rate and selectivity of CO increases. The optimal catalyst Ni 1 Mo 1 achieves 32.1% CO 2 conversion with 98.0% of CO selectivity and 71.1 mmol g cat −1 h −1 of CO evolution rate under a 300 W xenon lamp irradiation. Further increasing the Mo content reduces the CO evolution rate while maintaining the high CO selectivity. In the mechanistic study, it is revealed that the Ni–Mo alloy with an appropriate Ni/Mo ratio (e.g., Ni 1 Mo 1 ) possesses a modified electronic structure with more negative d-band center, which increases the light absorption, reduces the H 2 dissociation, and favors the CO desorption, thereby leading to efficient and selective photothermal reduction of CO 2 to CO. In this work, a viable strategy to design nickel-based catalysts is provided for efficient and selective photothermal CO 2 reduction via composition-mediated modification of electronic structure.
研究领域:
材料科学
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环境科学
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化学工程
✓ 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
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腐蚀工程
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表面工程
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可再生能源
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冶金学
✓ 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）