MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
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2023
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IF 6.4
Weiqiang Hu,Lianfeng Wei,Yanchao Li,Wen Zhang,Zongqing Ma,Chenxi Liu,Yongchang Liu
Oxide dispersion strengthened (ODS) refractory metals , represented by tungsten and molybdenum alloy , possesses many excellent properties such as high-temperature strength , outstanding thermal microstructure stability and good resistances to oxidation and corrosion. However, in traditional preparation technologies, these ex-situ oxides usually form poor oxide/matrix interface relationships and keep coarse sizes at grain boundaries (GBs), which prominently limit the improvement of alloy mechanical properties until now. In this work, we skillfully employed novel phase interface engineering to successfully construct completely coherent oxide/matrix interfaces in ODS Mo alloys through the newly formed ternary phase oxide nanoparticles or diffusion layers. Furthermore, these ODS Mo alloys are characterized by ultrafine grains, ultrafine subgrains, small and dispersed intragranular and intergranular particles. An amount of oxygen impurities can also be depleted via phase interface engineering, thus purifying Mo matrix. The phase interface engineering endows ODS Mo alloys with ultrahigh strength, excellent ductility and excellent hot machinability , which illuminates a new research direction for those ex-situ oxide dispersion strengthened alloys with excellent mechanical properties.
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CERAMICS INTERNATIONAL
·
2019
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IF 3.45
Liang Cheng,Rui Gao,Biaojie Yan,Zhenliang Yang,Bingqing Li,Qingdong Xu,Pengchuang Liu,Mingfu Chu,Bin Bai,Pengcheng Zhang
UO 2 –Mo composites are expected to be candidate materials for use as enhanced thermal fuel in the next generation of high-level safety reactors. Nevertheless, the UO 2 matrix tends to create micro-cracks caused by thermal stress generated during the sintering process. A novel type of UO 2 –Mo-SiC w composite is fabricated by spark plasma sintering (SPS) to enhance the thermal-mechanical properties of UO 2 . In the composite, SiC w is dispersed uniformly in the UO 2 matrix to form microspheres , and Mo is distributed in a three-dimensional network to form heat-conduction channels. Micro-cracks in the UO 2 matrix are significantly suppressed in the UO 2 –Mo composite, since only a small amount of SiC w is incorporated into the UO 2 . Indentation testing indicates a great capability of the SiC w to sharply enhance the crack propagation resistance of the UO 2 matrix. The estimated indentation fracture toughness reaches 0.91 MPa m 1/2 with the incorporation of 0.5 vol% SiC w , representing a 68.5% improvement over the value of 0.54 MPa m 1/2 obtained for the UO 2 –Mo composite. The thermal conductivity of the UO 2 –4Mo composite at 1000 °C was enhanced by approximately 54.3%, 60.1% and 67.2% for a SiC w content of 0.5, 2, and 4 vol%, respectively, compared with pure UO 2 . These results provide new insight for further improving the safety and lifespan of UO 2 fuel in reactors.
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RSC Advances
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2019
·Vol. 9
·期 27
·15629-15634
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IF 3.049
Jie Qi,Dechao Kong,Danyang Liu,Lun Pan,Ying Chen,Xiangwen Zhang,Ji-Jun Zou
Bismuth vanadate photoanode has shown great potential for photoelectrochemical (PEC) catalysis, but it needs to be further modified because of its relatively low charge-separation efficiency and poor stability. Herein, the bimetallic phosphide NiCoP decorated Mo–BiVO4 is fabricated through the electrodeposition and drop-casting method, which significantly improves the charge separation and surface oxidation reaction. Therefore, the fabricated NiCoP/Mo–BiVO4 photoanode exhibits a low onset potential of 0.21 V (vs. RHE) and high photocurrent of 3.21 mA cm−2 at 1.23 V (vs. RHE), which is 3.12 times higher than that of pure BiVO4. Importantly, the decoration of NiCoP significantly improve the stability of BiVO4 photoanode.
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PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2017
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IF 3.582
Yuanyuan Zhao,Qunwei Tang,Benlin He,Peizhi Yang
Creation of robust and stable electrocatalysts is a persistent objective for high-efficiency hydrogen evolution by water splitting. We present here the experimental realization of one-dimensional Mo incorporated W 18 O 49 nanofibers (NFs) by a template-free solvothermal method . When utilized as electrocatalysts for hydrogen evolution through water splitting, the preliminary results demonstrate that the optimized catalytic electrode from 1 at% Mo doped W 18 O 49 NFs yields an onset overpotential of 89 mV and Tafel slope of 49 mV dec −1 as well as maximal exchange current density up to 1.60 × 10 −2 mA cm −2 . An overpotential as low as 462 mV is required to attain current density of 50 mA cm −2 in comparison with 587 mV for pristine W 18 O 49 NFs. Moreover, the Mo doped W 18 O 49 NFs display relative stability by applying a potential of 503 mV and a current density of 80 mA cm −2 over 24 h in 0.5 M H 2 SO 4 aqueous solution, making them promising in practical applications.
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JOURNAL OF SOLID STATE CHEMISTRY
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2024
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IF 3.2
Xiaoqi Xie,Mingang Fan,Hongli Du,Li Feng,Chao Liu
Recently, ZnCdS has become an attractive visible-light-driven photocatalyst due to its tunable band gap and suitable band edge position. However, fast recombination of photo-generated carriers in ZnCdS still restricting its industrial application. In this paper, a novel and high-efficiency MgTi 2 O 5 /ZnCdS composite was constructed by in situ growth of ZnCdS nanoparticles on MgTi 2 O 5 . The photocatalytic activity of the Mg 2 TiO 5 /ZnCdS composite was evaluated using methyl orange (MO), tetracycline (TC), and methylene blue (MB). The results show that the as-prepared hybrid exhibited highly efficient photocatalytic activity under visible light irradiation, and the degradation efficiencies in 1 h reach about 93 %, 96.2 % and 94.5 % for MO, TC and MB, respectively, while the pure ZnCdS show only 60 % degradation efficiency under the same conditions, respectively. The improved photocatalytic activity could be attributed to the high efficient charge separation and fast charge transport in the MgTi 2 O 5 /ZnCdS composite, which are mainly due to the built-in electron field formed at the joint of the Mg 2 TiO 5 /ZnCdS heterojunction.
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Catalysis Science & Technology
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2024
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IF 4.4
Liuqing Wang,Jinsheng Li,Qinglei Meng,Meiling Xiao,Changpeng Liu,Wei Xing,Jianbing Zhu
The insufficient performance of non-noble metal catalysts in alkaline media is a prominent issue that limits the widespread adoption of electrocatalytic water splitting. In this study, we present an efficient Mo doping strategy to boost the electrocatalytic performance of NiFe layered double hydroxide (LDH) through modulating the electronic structure of active Ni sites. The optimized Mo doped NiFe-LDH (denoted as NiFeMo-2) exhibits significantly improved activity, showing a smaller overpotential of 262 mV at 10 mA cm−2 compared to NiFe-LDH (344 mV). X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR) spectra demonstrate that the incorporation of Mo not only increases the electron cloud density of Ni, but also induces more oxygen vacancies. Due to these structural modifications, the oxygen evolution reaction (OER) kinetics is dramatically enhanced, confirmed by in situ electrochemical impedance spectroscopy (EIS). Moreover, in situ Raman spectroscopy shows that the Mo doping can facilitate the formation of active NiOOH species at a lower potential, thus accelerating the OER kinetics. The in situ differential electrochemical mass spectrometry (DEMS) technique with 18O isotope labelling, tetraalkylammonium cation (TMA+) chemical probe, and ethanol oxidation reaction suggest that the NiFeMo-LDH catalyst primarily follows the adsorbate evolution mechanism (AEM) pathway, the promoted dehydrogenation process with the modulation of *OH adsorption. This study reports a high-performance non-noble metal OER electrocatalyst and unveils the origins of metal doping to enhance the OER kinetics.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
·
IF 8.1
Dan Wang,Hanlin Wang,Juanjuan Fan,Hancheng Zhu,Akira Fujishima,Xintong Zhang
Photoelectrochemical (PEC) performance of photoanode is limited by the cascade-dynamic processes, mainly including light absorption , charge separation, and surface reaction. This work adopted a strategy of nanocones modification on FTO substrate (FTO-NC) to enhance light utilization and photoelectrons collection for improved PEC water splitting . Comparative studies showed that FTO-NC enhanced the light scattering, promoting the conversion process of photon to electron/hole and enlarging the effective surface area of BiVO 4 for surface reaction. Meanwhile, cooperative Mo-doping and Co-MOF decoration improved the bulk electron transportation in BiVO 4 , hole migration towards the electrode surface , and accelerated the water oxidation reaction of photogenerated holes. The photocurrent density of FTO-NC/BiVO 4 -Mo/MOFs reached 3.56 mA cm −2 , 6.14 times that of pristine BiVO 4 . The IPCE of FTO-NC/BiVO 4 -Mo/MOFs photoanode achieve 60% at 1.23 V vs. RHE, demonstrating a significantly enhanced light utilization performance. This work presents new insight into boosting cascade-dynamic processes through collaborative strategies for highly efficient PEC water-splitting.
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Surfaces and Interfaces
·
2024
·
IF 5.7
Xiaoning Tong,Junli Wang,Yuantao Yang,Zhenwei Liu,Jing Wang,Can Zhang,Qingxiang Kong,Ruidong Xu,Linjing Yang
Currently, hydrogen production through water electrolysis stands out as one of the most promising methods. However, the efficiency of hydrogen production is limited by the anodic oxygen evolution reaction , which involves a four-electron transfer process. Therefore, the development of an efficient and durable anode catalyst is important to reduce energy consumption and increase the hydrogen production rate. Herein, the Mo-doped Ni 3 S 2 nanopillar structures were successfully synthesized by hydrothermal process on nickel foam (NF). Subsequently, nanosheets of CoFe-layered double hydroxides (LDH) thin films were deposited to obtain the CoFe-LDH/Mo-Ni 3 S 2 /NF catalyst. Physical characterization results revealed polycrystalline properties of the CoFe LDH nanosheets , while a non-homogeneous interface was also formed with Mo-doped Ni 3 S 2 nanopillars. The contact angle verified the excellent hydrophilicity , which allowed the rapid release of oxygen bubbles. In terms of electrocatalysis , the catalyst exhibited an overpotential of only 227 mV at 10 mA/cm 2 and demonstrated remarkable current density retention after 100 h. The catalyst was also characterized by good retention of the current density at 10 mA/cm 2 . This work provided the strategy for designing efficient, inexpensive and durable catalysts.
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Journal of Energy Chemistry
·
2025
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IF 14.9
Cenyu Yang,Chen Hu,Xiaoyu Wu,Yao Pang,Xiaofang Liu,Jianglan Shui
Metallic single-atom catalysts (SACs) have demonstrated high activity and potential in enhancing the hydrogen storage properties of MgH 2 . However, previous reports primarily focus on supported SACs, which often suffer from insufficient contact between single-atom active sites and hydrogen storage materials. In this study, the precursor Mo(CO) 6 is uniformly dispersed on the surface of MgH 2 via impregnation adsorption, leading to the formation of alloy-type Mo single atoms after hydrogenation/dehydrogenation activation. This alloy structure enables zero-distance contact between catalytic sites and the hydrogen storage material, facilitating electron exchange and hydrogen transfer between the Mo sites and MgH 2 . The MgH 2 loaded with Mo single atoms (Mo 1 -MgH 2 ) exhibits excellent hydrogen absorption and desorption properties, with the initial hydrogen release temperature lowered from 323 to 218 °C. At 250 °C, Mo 1 -MgH 2 absorbs over 6.77 wt% of hydrogen within 1 min and releases over 5.85 wt% within 4 h. During 10 cycles of hydrogenation and dehydrogenation reactions, Mo 1 -MgH 2 maintains nearly 100% capacity and shows stable kinetics. This work provides new insights into the design and fabrication of catalysts for hydrogen storage materials.
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CRYSTENGCOMM
·
2025
·
IF 2.6
Shengke Tang,Ding Li,Xiang Wu
The exploration of high-active and durable transition metal phosphides (TMPs) electrocatalysts is important for the development of green and sustainable energy technology. However, the poor stability and expensive prices of the catalysts restrict their applications in electrolysis of water. Doping metal atoms can improve the total performance of TMPs. Herein, we prepare several Mo doped Co0.4Fe1.6P materials through one step hydrothermal route. The Mo-Co0.4Fe1.6P-5% sample possesses 73 mV@10 mA cm-2 and 260 mV@50 mA cm-2 for HER and OER, respectively. Moreover, it delivers 1.787 V at 100 mA cm-2 for electrolysis of water. The catalysts also present a cycle life of 300 h. It demonstrates a facile approach to engineer high-performance non-precious metal electrocatalysts toward efficient water splitting.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2019
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IF 4.175
Fei Chen,Mingyong Jia,Yulong She,Yueqi Wu,Qiang Shen,Lianmeng Zhang
In this paper, aluminum nitride (AlN) and molybdenum (Mo) were used for fabrication of AlN/Mo functionally graded materials by spark plasma sintering (SPS). In order to study the influence of microstructure on mechanical properties in AlN/Mo FGMs, the FGMs with different composition exponent p value were analyzed by indentation and bending test . The results showed that the specimens with p < 1 exhibited a metal-rich graded structure comparing to specimens with p ≥ 1. The radial bending and shear strength of AlN/Mo FGMs reached maximum when p < 1, which are 369.78 MPa and 48.01 MPa respectively. Moreover, comparing with the porosity and the ceramic/metal interface, the distribution of the two components is the most important factor for improvement of bending and shear strength. The more the hard metal network content in the graded layer, the higher the bending and shear strength of AlN/Mo FGMs.
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JOURNAL OF THE AIR & WASTE MANAGEMENT ASSOCIATION
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2021
·
IF 2.235
Menglei Zhang,Hao Song,Chenghang Zheng,Shaojun Liu,Zhenglong Lin,Yi Liu,Weihong Wu,Xiang Gao
Recycling of valuable metals from spent catalysts in a green way is gaining extensive interest for economic and environment reasons. In this study, we developed novel hydrophobic deep eutectic solvents to extract Mo from spent catalysts. The hydrophobic DESs have been designed and synthesized by mixing one molar of the quaternary ammonium salt and two molars of various saturated fatty acids with different carbon chain lengths. The extraction ability and extraction mechanism of these DESs were studied, some factors influencing the extraction efficiency, including the structure of hydrogen bond acceptors and hydrogen bond donors, initial aqueous pH, reaction time and temperature, phase ratios were investigated. It is found that the synthesized hydrophobic DESs exhibit excellent extraction performance toward Mo, where the Mo distribution ratio is more than 2200 in the presence of other metals, corresponding to an extraction efficiency of 99% at optimal reaction conditions. This work reveals a distinct class of materials, guiding an effective and green way for spent catalyst treatment.Implications: Novel hydrophobic deep eutectic solvents have been developed to extract Mo from spent catalysts, the synthesized hydrophobic DESs possess several advantages, such as green, low price, low toxicity, and biodegradability. It exhibits excellent extraction performance under an optimized extraction condition. This work reveals a distinct class of materials, guiding a promising way for green and economical utilization of spent catalysts.
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