CORROSION SCIENCE
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2022
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IF 7.72
Jin Huang,Jian Zhang,Tingting Luo,Ruxia Liu,QinQin Wei,Guoqiang Luo,Qiang Shen
Corrosion test of Mo in LiF-LiCl-LiBr salt with different SO 4 2 content have been studied. MoO 2 , Mo 3 S 4 and MoS 2 was formed after corrosion. The SO 4 2- will corrode the grain boundary of Mo and lead to the decomposition of large Mo grain. Moreover, the formation of different corrosion products will lead to significant changes in volume and destroy the stable oxide layer which could be protective. The Mo will be severely corroded in LiF-LiCl-LiBr molten salt with a higher content of SO 4 2- .
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高影响因子
MOLECULES
·
2022
·Vol. 27
·期 21
·7617
·
IF 4.927
Xiaodong Fang,Xiangguo Wang,Ling Ouyang,Longcheng Zhang,Shengjun Sun,Yimei Liang,Yongsong Luo,Dongdong Zheng,Tairan Kang,Qian Liu,Feng Huo,Xuping Sun
The development of efficient electrochemical seawater splitting catalysts for large-scale hydrogen production is of great importance. In this work, we report an amorphous Co-Mo-B film on Ni foam (Co-Mo-B/NF) via a facile one-step electrodeposition process. Such amorphous Co-Mo-B/NF possesses superior activity with a small overpotential of 199 mV at 100 mA cm−2for a hydrogen evolution reaction in alkaline seawater. Notably, Co-Mo-B/NF also maintains excellent stability for at least 24 h under alkaline seawater electrolysis.Keywords:amorphous Co-Mo-B film;alkaline seawater electrolysis;hydrogen evolution reaction
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高影响因子
Journal of Cleaner Production
·
2022
·
IF 11.072
Meng Liu,Xiangzhe Yan,Lezhu Su,Hang Dong,Zhan Hu,Yuanqi Peng,Liqian Guan,Junjie Zhang,Zhi Zhou,Yongfa Zhu,Nan Zhou
Pyrolysis technology has been focused on waste plastics for recycling. However, there is rare research for reusing pyrolysis products (carbon nanotubes). Based on pyrolysis technology of waste polypropylene (PP) plastic, carbon nanotube coated Fe–Mo/MgO nanomaterial (CNT@Fe–Mo/MgO) was prepared by chemical vapor deposition to remove Gram-pathogenic bacteria. The addition of Mo and MgO promoted the cracking of PP plastic and the formation of MWCNTs. The as-obtained CNT@Fe–Mo/MgO can stimulate H 2 O/O 2 to produce abundant ·OH, ·O 2 − and 1 O 2 radicals, which probably resulting from the synergistic effect of delocalization of CNTs and REDOX pair of Fe 3 O 4 . Consequently, the removal rate of Escherichia coli and Staphylococcus aureus by CNT@Fe–Mo/MgO composite catalyst can reach 100% within 2h, without the help of any additional energy or active oxidant. At the same time, the material is remarkable stability and reusability with complete removal of pathogens after six cycles. This study not only provides a method for the synthesis of highly effective sterilizers , but also opens up a new direction for the application of functional carbon nanocomposites prepared by pyrolysis of waste plastics.
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Molecular Catalysis
·
2021
·
IF 5.062
Freeman Bwalya Kabwe,Jian Qiang Zhong,Wei Jun Huang,Cun Jun Li,Chun Hui Zhou
Mo, V and W oxides supported on montmorillonite (Mt) have shown good activity in catalytic glycerol oxidehydration. However, these catalysts deactivate rapidly due to coking. Understanding the role of Mo, V and W oxides in coke formation is essential to overcome the coking problem. Herein, individual and combination of Mo, V and W oxides supported on Mt were investigated to reveal the contribution of Mo, V and W oxides to coke formation. Among single metal oxide catalysts, Mo-Mt and W-Mt suffered more from coke formation than V-Mt. A mixture of Mo 5+ and Mo 6+ in the Mo-Mt catalyst hindered full oxidation during the oxidehydration, thus promoting coking. The oxidation of V 4+ to V 5+ helped diminish coke in mixed Mo-V-Mt and W-V-Mt. This work is expected to provide new information for designing high-performance Mo, V and W oxide catalysts with superior coke resistance.
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ACS Applied Energy Materials
·
2021
·
IF 6.024
Jingran Xiao,Borui Du,SiYuan Hu,Jun Zhong,Xingyu Chen,Yanghong Zhang,Dongren Cai,Shu-Feng Zhou,Guowu Zhan
It is well-known that sluggish surface charge transfer on a cocatalyst-free hematite photoanode limits its solar conversion efficiency in photoelectrochemical (PEC) water splitting. Here, Mo is used as a codopant synergistically with Sn in α-Fe2O3 to solve this problem. Besides causing a slight narrowing of bandgap, morphological change, and even sublimation loss of α-Fe2O3, Mo doping also imports low-valent Fe due to charge compensation with MoV/VI as indicated by X-ray photoelectron spectroscopy and Bader charge computation, which increases the densities of donor and surfaces states. Although rate law analysis demonstrates slight retardation of surface reaction kinetics, strongly inhibited charge recombination in surface states by Mo doping still contributes to improving the photocurrent density and reducing the onset potential of α-Fe2O3 and Sn–Fe2O3 photoanodes. An optimized Mo/Sn–Fe2O3 photoanode can realize a low onset potential of 0.68 V vs a reversible hydrogen electrode (VRHE) and a photocurrent density of 1.97 mA cm–2 at 1.23 VRHE, enhanced by 58% and 20 times compared to Sn–Fe2O3 and α-Fe2O3, respectively. It is demonstrated that Mo doping promotes charge transfer which differs from most traditional n-type dopants that facilitate charge separation but inhibit charge transfer. This report expands the n-type dopant family of α-Fe2O3 for efficient PEC water splitting.
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CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Yikai Lu,Zixuan Li,Yanling Xu,Linqian Tang,Shengjie Xu,Di Li,Jianjun Zhu,Deli Jiang
Developing non-precious metal electrocatalysts with high activity and stability are of great significance to achieve overall water splitting. In this work, cobalt-molybdenum nitride nanosheet arrays grown on Ni foam (CoMoN x NSAs/NF) were prepared via a facile hydrothermal and nitridation process. The resulting CoMoN x NSAs/NF not only has a specific large surface area and provides more active sites but also possesses good electrical conductivity, contributing to the fast reaction kinetics. Furthermore, the synergistic effect between Co 2 N and Mo 2 N cooperatively enhance the charge transfer, thus further improving the electrocatalytic activity. Benefiting from these merits, the optimal CoMoN x -500 NSAs/NF exhibits excellent activities for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) with overpotentials of 91 and 231 mV at the current density of 10 mA cm −2 , respectively. Moreover, the CoMoN x -500 NSAs/NF||CoMoN x -500 NSAs/NF couple requires a low cell voltage of 1.55 V at the current density of 10 mA cm −2 , which is much superior to many other reported transition metal nitrides catalysts. This present work provides a reference for the design of bimetallic nitrides with superior electrocatalytic performance for overall water splitting.
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JOM
·
2020
·Vol. 72
·期 3
·1279-1285
·
IF 2.054
Xia Yang,Zhao Jinlong,Dong Zhaowang,Guo Xueyi,Tian Qinghua,Liu Yong
Cobalt-chrome-molybdenum (Co-Cr-Mo) alloy possesses outstanding strength, wear, and corrosion resistance and is a good material candidate for making dental and orthopedic implants. Spherical Co-Cr-Mo powder for additive manufacturing is usually costly due to the high-temperature melting processes and low yield of the powder with desirable particle size in the conventional melt-atomization process. A novel process for making spherical Co-Cr-Mo alloy powder through a simple meltless granulation and sintering process is described herein. The results indicate that the compositional segregation problem can be overcome and high-temperature operation avoided. Segregation-free powder was obtained after sintering above 1200°C. The powder was purified during sintering in a hydrogen atmosphere. The hydrogen purification mechanism is discussed with the aid of thermodynamic modeling using HSC Chemistry software. The oxygen content in the final powder can be controlled to < 0.2 wt.% for powder with particle size < 107 µ m. The final powder retained good spherical morphology.
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INORGANIC CHEMISTRY
·
2020
·
IF 4.825
Haonan Liu,Hongping Wu,Hongwei Yu,Zhanggui Hu,Jiyang Wang,Yicheng Wu
Mo(VI)-containing phosphates are widely used in catalyses, ion batteries, and nonlinear optical (NLO) crystals. However, few strategies can effectively guide the syntheses of the Mo(VI)-containing phosphates. In this paper, three new Mo(VI)-containing phosphates, Cs3Mo12PO40, LiK(MoPO6)2, and Sr(MoPO6)2, with different dimensions have been successfully synthesized by adjusting the Mo/P ratios. Interestingly, Cs3Mo12PO40 is a classic Keggin-type polyoxometalate composed of zero-dimensional (0D) [Mo12PO40]3– clusters, whereas LiK(MoPO6)2 and Sr(MoPO6)2 have three-dimensional (3D) [MoO2O4P]∞ frameworks consisting of MoO6 octahedra and PO4 tetrahedra in a 1/1 ratio. Detailed structural comparisons of Mo(VI)-containig phosphates indicate that the Mo/P ratios have a significant effect on the structural dimensions. Further, the optical properties and thermal stabilities of Cs3Mo12PO40, LiK(MoPO6)2, and Sr(MoPO6)2 are also determined.
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ACS Catalysis
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2020
·
IF 12.35
Hai-Bin Wang,Jia-Qi Wang,Rui Zhang,Chuan-Qi Cheng,Kang-Wen Qiu,Yi-jie Yang,Jing Mao,Hui Liu,Miao Du,Cun-Ku Dong,Xi-Wen Du
Highly effective catalysts are of great importance for artificial nitrogen fixation. Inspired by the natural nitrogenase, we biomimetically designed an inorganic catalyst, Mo(IV)-doped FeS2, for electroreduction of dinitrogen to ammonia. The Mo(IV) ions favor the adsorption and activation of N2, while the FeS2 substrate depresses the competitive hydrogen evolution reaction, and the two factors jointly endow the catalyst with a high Faraday efficiency of 14.41% at −0.2 V versus RHE.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
·
IF 4.939
Yutong Wang,Lun Pan,Yixin Chen,Guoqiang Shen,Li Wang,Xiangwen Zhang,Ji-Jun Zou
Ni-based alloys are considered as the efficient catalyst for hydrogen-storage materials decomposition. Herein, we applied an in-situ melt-quenching method to dope Mo in Ni-based alloy for catalytic hydrogen evolution from hydrogen-storage materials. Importantly, Mo doped Ni-based catalyst exhibits more than 6 times higher TOF value than that of pure Ni both in AB hydrolysis and hydrazine decomposition, because Mo acts as an electron donor to improve the reducibility of Ni. Hydrogen evolution kinetics were studied over a range of temperatures (303–353 K) and initial feed concentrations (catalyst/hydrogen-storage materials (wt/wt) ratios = 0.2–10). Under optimal reaction conditions, the H 2 evolution rate reaches 1.92 mol H 2 /(mol cat min) and 0.05 mol H 2 /(mol cat min) in the hydrolysis of ammonia borane and decomposition of hydrazine, which are 6.42 and 6.44 times higher than undoped Ni catalyst, respectively. And the apparent activation energy of ammonia borane hydrolysis and hydrazine decomposition were evaluated to be 26.66 ± 3.31 kJ/mol and 40.01 ± 3.38 kJ/mol, respectively.
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Nanoscale
·
2020
·Vol. 12
·期 32
·17045-17052
·
IF 6.895
Jun Xu,Changji Fang,Zhiqian Zhu,Jingwen Wang,Bansui Yu,Junjun Zhang
Two-dimensional (2D) lamellar ReS2 nanosheets are considered a promising electrocatalyst for the hydrogen evolution reaction (HER) but suffer from poor intrinsic conductivity and catalytically inert basal planes. In this work, sub 50 nm hierarchical Mo-doped ReS2 nanospheres consisting of numerous few-layered and defect-rich nanosheets are designed and synthesized as robust and efficient HER catalysts. On the one hand, the small size of the hierarchical structure, the disordered basal planes and the expanded interlayer endow the nanosheets with plentiful defects, thereby resulting in abundant exposed active sites. On the other hand, Mo-doping offers the nanosheets with some electronic benefits of unsaturated electrons, improved intrinsic conductivity, and optimized hydrogen adsorption free energy (ΔGH) of the basal planes. Owing to the synergistic effects, the 10%Mo-ReS2 catalyst exhibits an optimized catalytic activity with striking kinetic metrics of a small Tafel slope of 62 mV dec−1, a low overpotential of 81 mV at 10 mA cm−2, and a long operation stability of 50 h, and its performance is among the best of ReS2-based catalysts. This work provides a new approach for gaining the structural and electronic benefits of ReS2 catalysts by combinational nanoscale engineering and heteroatom doping.
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CHEMICAL GEOLOGY
·
2020
·
IF 3.363
Jing-Jing Fan,Jie Li,Qiang Wang,Le Zhang,Jing Zhang,Xiang-Lan Zeng,Lin Ma,Zi-Long Wang
Recent advances in analytical techniques have achieved high-precision (2σ ≤ 0.06‰) determinations of Mo isotopic ratios in silicate rocks but few such data are as yet available, especially for low-Mo (<50 ppb) rocks such as leucogranites . Here we present two low-blank, double-spike, high-yield, ion-exchange chromatographic methods (single- and two-column) for precise determination of Mo isotopic ratios in low-Mo rock samples (10–500 ppb) using multicollector–inductively coupled plasma–mass spectrometry (MC–ICP–MS). The two-column technique involved AG 1-X8 anion-exchange (100–200 mesh) and BPHA chelatin resins, with the latter also used in the single-column procedure. Two USGS reference materials (basalt BIR-1a and diabase W-2a) were analyzed for quality-control purposes. Their δ 98/95 Mo values determined using the two methods are consistent within uncertainties, and with those determined by previously published methods. We provide the first Mo isotopic data for the reference materials of dunite DTS-2b (USGS), GPt-3 (NRCG) and peridotite WPR-1 (CCRMP). δ 98/95 Mo values for DTS-2b and WPR-1 by using two-column procedure are in good agreement with those obtained by single-column separation. Repeated analyses of these standards indicate a long-term external reproducibility of better than ±0.05‰. However, the δ 98/95 Mo values of GPt-3 show poor reproducibility due to either the sample heterogeneity or existing undigested minerals (e.g., spinel). The methods were applied to leucogranites with low Mo contents of 10–74 ppb from the Himalaya orogen and southern Lhasa terrane of Tibet . The isotopic analyses yielded δ 98/95 Mo values of −0.2‰ to 0.34‰ and −0.41‰ to −0.68‰ (against NIST SRM 3134), respectively, within the range of values for igneous crust. Their contrasting Mo isotopic compositions may indicate compositional diversity in their sources or differences in magma evolution .
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