Inorganic Chemistry Frontiers
·
2017
·Vol. 4
·期 11
·1791-1797
·
IF 4.036
Jiangli Meng,Jiaqi Fu,Xiaoxuan Yang,Meijie Wei,Song Liang,Hong-Ying Zang,Huaqiao Tan,Yonghui Wang,Yangguang Li
The development of stable, highly active and cheap electrocatalysts towards the oxygen evolution reaction (OER) has been an ongoing challenge due to practical problems such as slow kinetics and high overpotential. Herein, we utilized a one-pot hydrothermal method to prepare cobalt/nickel molybdate hierarchical microflowers on conductive carbon cloth (MMoO4-CC, M = Co, Ni) as three-dimensional self-supported electrodes for the oxygen evolution reaction. CoMoO4-CC showed better catalytic activity than NiMoO4-CC. Benefiting from the synergistic effect of a large active area, fast charge and mass transport as well as a three-dimensional conducting path, the CoMoO4-CC nanosheet electrode showed a large current density and a relatively low starting potential, delivering 10 mA cm−2 current densities at an overpotential of 290 mV and a Tafel slope of 94 mV dec−1. Furthermore, the CoMoO4-CC nanomaterial shows better electrocatalytic stability than IrO2-CCa, which could be a promising electrocatalyst for large-scale water oxidation.
研究领域:
电催化
·
材料科学
·
能源化学
·
电化学
·
纳米材料
✓ 已验证
DOI
高影响因子
Materials Research Express
·
2020
·Vol. 7
·期 3
·036201
·
IF 1.929
Hui Yu,Xinan Shi,Lijian Huang,Xiaojiao Kang,Daocheng Pan
A series of Eu3+ and Tb3+ co-doped CaMoO4/SrMoO4 luminescent thin films were prepared by a facile solution method, and they were annealed at 550 °C for 2 h. The luminescent properties of the thin films were studied, which involve the energy transfer from Tb3+ to Eu3+. The emission color can be changed from green to red, with increasing Eu3+ doping concentration in Tb3+-doped CaMoO4/SrMoO4 thin films. In addition, it was observed that the PL intensity of Eu3+ will enhance when Tb3+ ions are incorporated into Eu3+-doped CaMoO4/SrMoO4 thin films. The optical band gaps of the luminescent thin films are found to be in the range of 4.49 to 4.72 eV. These results revealed that Eu3+ and Tb3+ co-doped CaMoO4/SrMoO4 luminescent thin films have a significantly potential application in electroluminescent devices.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 5
·736
·
IF 5.719
Yarong Xue,Mingfen Wei,Dingyi Fu,Yuqing Wu,Bo Sun,Xianghui Yu,Lixin Wu
We report a unique phenomenon, the opposite color response of a giant polyoxometalate, (NH4)42[Mo132O372(CHCOO)30] (H2O)72([Mo132]), to the existing states of human papillomavirus (HPV) major capsid protein, L1-pentamer (L1-p), and virus-like particles (VLPs). The color responses originate from the different assembly forms between [Mo132] and the capsid protein. The latter were inspected and separated by using CsCl gradient centrifugation, and validated in detail by sodium dodecyl sulfate-polyacrylamide gel-electrophoresis (SDS-PAGE), dynamic light scattering (DLS), and transmission electron microscopy (TEM) imaging. Furthermore, the intrinsic mechanisms were investigated in-depth by using XPS-based semi-quantitative analysis and well-designed peptides, revealing the critical points of L1 that determine the charge–transfer ratio between Mo(V) to Mo(VI), and consequently, the levels of [Mo132] hypochromic in different assemblies. Such a unique phenomenon is significant as it supplies a colorimetry approach to distinguish the existing states of the HPV capsid protein and would be significant in the quality assay of the HPV vaccine and existing states of other viruses in the future.Keywords:colorimetric discrimination;giant polyoxometalate;HPV capsid protein;hypochromic of molybdate clusters;opposite color response
研究领域:
化学
·
病毒学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
·
2024
·Vol. 55
·期 6
·5221-5234
·
IF 2.4
Sun Hu,You Mengyu,Hou Yanrui,Luo Jun,Rao Mingjun,Han Guihong,Li Guanghui
The mainstream oxidative roasting method is facing challenges in processing low-grade molybdenite (MoS 2 ) concentrates, calling for deep understandings toward the behaviors of impurities. This study took pure minerals and reagents as the objects and conducted elaborate experiments and theoretical calculations into the formations of molybdates and their influences on MoS 2 oxidation. The emphasis are on the reactions under local O 2 -absent conditions and the sintering of MoS 2 caused by molybdates of Ca, Fe, Cu, or Pb. It was found that molybdates could directly form from MoO 2 or MoS 2 without O 2 at 600 °C to 650 °C, due to the promotion of reactivity and reducibility of MoO 2 when combining with impurity metals. The produced molybdates would lower the melting point, dissolve in liquid MoO 3 , and migrate to oxidation interface to form a sintering layer that inhibits O 2 diffusion. Overall, this study has discovered new pathways of molybdates formation and new effects of segregation on the sintering and established evolution patterns of bulk MoS 2 concentrate during roasting, which may be significant complements to the fundamentals of classical molybdenum metallurgy.
研究领域:
冶金学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yue Ji,Tian Tian,Pengju Chen,Yuan Zhao,Hao Wu,Yan Wu,Hiroshi Watabe,Wenlong Li,Yuezhou Wei,Xiangbiao Yin
99m Tc is one of the most widely used radioisotopes in nuclear medicine for diagnostic applications, with its supply critically dependent on the beta (β)-decay of the parent nuclide 99 Mo. To address this dependency, the cold sintering process has been introduced as a novel and facile technique to fabricate high-density MoO 3 ceramic targets for efficient 99 Mo production. It was explored in detail for the effects of transient liquid solutions, sintering temperature, uniaxial pressure, holding time, and additive formulation on the densification of raw MoO 3 powder. The results show that the typical transition solution of (NH 4 ) 6 Mo 7 O 24 ·4H 2 O and H 2 O mixture was most conducive to densifying MoO 3 material. The optimum conditions for cold sintering were under temperature of 200 °C, pressure of 500 MPa, holding time of 10 min, and transient aqueous solution of 10 wt.% (NH 4 ) 6 Mo 7 O 24 ·4H 2 O and 10 wt.% H 2 O. After further annealing cold-sintered MoO 3 at 600 °C, pure MoO 3 ceramic was obtained with the disappearance of the second phase. The pure MoO 3 ceramic target had a relative density of 95.48%, compressive strength of 118.01 MPa, and micro-Vickers hardness of 0.472 GPa. All these results suggested that cold sintering could be an energy-saving economical and efficient technique on the densification of MoO 3 for preparation its ceramic target, which are expected to inspire new insights to establish more practical technologies for 99 Mo and 99m Tc productions.
研究领域:
核医学
·
材料科学
·
放射性同位素生产
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2021
·Vol. 51
·期 4
·1481-1488
·
IF 4.39
Maierhaba Abudoureheman,Juanjuan Zheng,Peng Wang,Bo Wei,Zhiyong Guo,Zhaohui Chen,Yanna Chen
The exploration of A–Mo–P–O (A = Rb, Cs) systems has allowed several new Mo(V) phosphates, Rb2MoP2O9, Rb6Mo2P4O19 and Cs6Mo2P4O19, to be synthesized through the spontaneous nucleation method. Single-crystal X-ray diffraction analysis reveals that the identical stoichiometry compounds Rb2MoP2O9 and Cs2MoP2O9 belong to different space groups C2/c and Pbca, respectively. Both compounds consist of dissimilar 1D [Mo–O–P]∞ chains with different repeated building units, while monovalent cations fill in spaces to form 3D structures. However, Rb6Mo2P4O19 and Cs6Mo2P4O19 are isostructural and crystallize in the same space group of P21/c. They exhibit a 3D framework structure with 0D Mo2O5O6P4O8 groups, which are separated by Rb/Cs atoms. Interestingly, structural relationships between the different monophosphates of the A–Mo–P–O (A = Rb, Cs) systems are presented in which distinct polyanionic configurations appear owing to the A/P ratios, as well as the size of the univalent cations. Further, detailed structural comparisons, optical properties and theoretical calculations are also discussed.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Jin Chen,Chun-Li Hu,Yi-Lin Li,Qian-Qian Chen,Bing-Xuan Li,Jiang-Gao Mao
Herein, we reported two alkali metal molybdenum(VI) iodates, namely, NaMoO 3 (IO 3 ) and γ-KMoO 3 (IO 3 ) with 1D and 3D [MoO 3 (IO 3 )] − anionic architectures, respectively. The novel 1D chain in NaMoO 3 (IO 3 ) and the 3D network in γ-KMoO 3 (IO 3 ) are constructed by the 0D Λ-shaped cis -[MoO 4 (IO 3 ) 2 ] 4− building units interconnected by bridging IO 3 − anions as well as the corner-sharing of oxo anions. Importantly, the polar γ-KMoO 3 (IO 3 ) exhibits a very large second-harmonic generation (SHG) effect of 12 × KH 2 PO 4 (KDP) under 1064 nm laser radiation, a high laser-Induced damage threshold value (52 × AgGaS 2 ), and a moderate birefringence of 0.087@1064 nm, whereas the centrosymmetric NaMoO 3 (IO 3 ) has a large birefringence of 0.208@1064 nm. This study further proves the useful route of exploring promising optical materials via assembling the 0D basic building units into higher dimensional anionic architectures.
研究领域:
无机化学
·
材料科学
·
光学
✓ 已验证
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2025
·
IF 7.4
Shiya Wang,Miaojun Xu,Wei Huang,Yingke Zhu,Juan Li,Peng Chen
Polyamide 56 (PA56) is a polyamide based on bio-based chemical and has attracted widespread attentions. In this paper, a series of phosphomolybdates (POMs) with Keggin structure were incorporated into PA56 to modify its flame-retardant properties. Different POMs show different effects on the flame-retardant efficiency in PA56. A small amount of 3 wt% sodium phosphomolybdate (PMoNa) or nickel phosphomolybdate (PMoNi) enable PA56 to achieve the UL-94 V-0 rating, while the samples containing other POMs are not classified in the test. The POMs promote the degradation of PA56 at low temperature and char formation at high temperature, and improves the thermal stability in air. Especially, the PMoNa and PMoNi restrain the release of heat, flammable volatiles and toxic gas by forming more char and changing the pyrolysis pathway during combustion, thus modify the flame retardancy of PA56 effectively. The mechanical properties are deteriorated more or less which need to be modified further.
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
CHEMOSPHERE
·
2020
·
IF 5.778
Jianjun Lian,Heli Wang,Hongping He,Weilin Huang,Mei Yang,Yin Zhong,Ping’an Peng
Iron sulfide (FeS) is an important scavenger for hexavalent molybdate (Mo(VI)) in an anoxic environment; it plays a crucial role in the mobilization and transformation of Mo(VI), although the underlying reaction mechanisms between Mo(VI) and FeS remain unclear. This study investigates the Mo(VI) reaction kinetics with the amorphous FeS over a pH range 5.0–9.0 and Mo’s chemical form on the FeS surface. It is found that the Mo(VI) reaction kinetics with FeS follow a pseudo first-order model, and the reaction rate constant ( k obs ) increases with a decrease in the pH value. The k obs at pH 5.0 is 0.027 min −1 , which is about 38 times higher than that at pH 9.0. The rapid Mo(VI) removal under acidic conditions is due to quick Mo(VI) transformation into stable MoS 2 and thiomolybdate (Mo V O x S y ). The amount of MoS 2 formed on the surface of FeS increases with a decrease in the pH value. Under neutral and alkaline conditions, Mo(VI) is not transformed into MoS 2 by FeS because the precipitation of iron oxy-hydroxide passivates the active sites of FeS. The study also investigates the effect of the initial dosage of FeS (20–200 mg L −1 ) and Mo(VI) (10–50 mg L −1 ) on the reaction kinetics of Mo(VI) with FeS. The results provides important information on the environmental fate of Mo(VI) in the anoxic environment containing amorphous FeS.
研究领域:
环境科学
·
地球化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Guoan Wang,Tingting Huo,Quanhua Deng,Fei Yu,Yuguo Xia,Haiping Li,Wanguo Hou
The oxygen vacancy (Ov) in photocatalysts plays a significant role for N 2 fixation, but effective and simple means for creation of Ov are in urgent demand. Herein, surface-layer Br doping was confirmed to create massive surface Ov in Bi 2 MoO 6 in a solvothermal process, with the product (BMO-Br-Ov) exhibiting remarkably enhanced N 2 chemisorption and activation, photoinduced charge separation, and thus photocatalytic N 2 fixation, compared with bulk Bi 2 MoO 6 , with an apparent quantum yield at 420 nm reaching 0.52% in pure water and 2.56% in the methanol aqueous solution. The charge separation enhancement benefits from the Ov introduced defect level and Br doping and surface Ov modification induced band-level difference between the surface and the inside in BMO-Br-Ov that leads to fabrication of the surface/inside homojunction. This work provides a simple way to create surface Ov in Bi 2 MoO 6 and may direct Ov creation in other Bi-based photocatalysts for efficient N 2 fixation.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
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.
研究领域:
无机化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Yong Liu,Ensheng Xu,Chao Xu,Wei Wei
As a tumor-related enzyme, PARP-1 activity is closely related to the occurrence of cancer. Sensitive detection of PARP-1 activity is of significance in the early diagnosis and treatment of cancer. Therefore, the gold nanorods (AuNRs) based biological nanoprobe was constructed for the visual and label-free detection of PARP-1 activity. dsDNA which activate PARP-1 was modified on AuNPs ( [email protected] ). MoO 4 2− is added to catalyze H 2 O 2 and KI to accelerate the etching of AuNRs. In the presence of PARP-1, hyperbranched poly (ADP-ribose) polymers (PAR) formed on the surface of [email protected] ( [email protected] @PAR). A large number of PO 4 3- of the PAR reacted with MoO 4 2− to generate PMo 12 O 40 3- . Thus, PO 4 3- diminished MoO 4 2− concentration in solution, preventing the etching of AuNRs. Therefore, PARP-1 prevented the etching of AuNRs. With the increasing concentration of PARP-1, the color of the solution changed from light blue to brown obviously. The method was applied to assay actual samples with satisfactory results. The strategy has the advantages of rapid quantitative analysis of PARP-1 activity with naked eyes, simple operation and good application prospect.
研究领域:
生物化学
·
纳米医学
·
肿瘤学
✓ 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）