SOLID STATE IONICS
·
2024
·
IF 3
Han-Yu Mao,Ya-Ting Zhang,Zhao-Zhong Wang,Xue Jiang,Mei-Ying Lv,Xuan-Ze Zhu-Ming,Peng Chen,Xue-Ping Gao
Sulfur-based compounds have been considered one of the most attractive cathode materials for next-generation batteries owing to their high energy density and environmental benignity. Among them, metal sulfides like MoS 2 show high conductivity as well as intrinsic catalytic activity , however, the sulfur content and specific capacity are relatively low. In this article, we proposed a sulfur-rich amorphous molybdenum trisulfide‑carbon nanotubes (MoS 3 -CNT) cathode via in situ deposition. Benefiting from the enhanced electrical conductivity and enriched abundant reactive sites, the cathode exhibits impressive performance when assembled as liquid and solid-state lithium metal batteries at room temperature . In liquid lithium metal batteries , optimized MoS 3 -CNT20% cathode exhibits an impressive high specific capacity of 900.7 mAh/g in the first cycle, while the cycling stability is poor (35.4% after 50 cycles) owing to severe shuttle effect . When fabricated with polymer solid-state electrolyte, the cycling stability could be significantly improved to 85.7% after 50 cycles with an initial capacity of 314.2 mAh/g. This study provides a rational strategy for developing high-performance metal sulfide cathodes thus helping sustainable development.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Hui Qiao,Zongyu Huang,Shengqian Liu,Yundan Liu,Jun Li,Xiang Qi
Molybdenum Telluride (MoTe 2 ) is widely used in the field of optoelectronics because of its excellent electron mobility and good environmental stability. Recent advances have shown that the reduction in the thickness of two-dimensional (2D) layered materials allows for greater surface area and more active sites to enhance electrocatalytic performance. Here, we prepared MoTe 2 nanosheets by liquid exfoliation. Characterization of the morphology and lattice structure of MoTe 2 nanosheets by a series of characterization methods. A three-electrode electrochemical system test results demonstrated that the MoTe 2 nanosheets have excellent electrocatalytic activity and stability in H 2 SO 4 solution compared to bulk MoTe 2. In addition, the MoTe 2 nanosheets also exhibited optimal electrocatalytic properties for hydrogen evolution reaction (HER) with −309 mV overpotential at a current density of 10 mA/cm 2 and a low Tafel slope of 118.9 mV/dec in a 0.5 mol/L (M) H 2 SO 4 solution. Our work demonstrates that MoTe 2 nanosheets have good prospects for use in electrocatalytic devices as high-performance electrocatalysts .
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Xiaoping Fan,Youguo Huang,Hongqiang Wang,Fenghua Zheng,Chunlei Tan,Yu Li,Xifei Lu,Zhaoling Ma,Qingyu Li
Defect engineering has been an efficient means to govern the electrocatalytic performances of oxygen electrode in Li-O 2 batteries. Herein, we introduce N atoms into MoS 2 for manufacturing sulfur vacancies to improve the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) kinetics of rechargeable Li-O 2 batteries. The obtained results show that N doping opened the crystal distance space of N-MoS 2 , reduced the charge transfer resistance and simultaneously induces Mo-N bonds and a large number of sulfur vacancies. The assembled Li-O 2 batteries with N-MoS 2 as the cathode electrocatalyst deliver discharge specific capacity of 5205.5 mAh g −1 at the current density of 100 mA g −1 , which is much higher than the MoS 2 (2600.3 mAh g −1 ). It also shows excellent cyclic performance with 224 cycles at the current density of 200 mA g −1 within a capacity limitation of 1000 mAh g −1 . Overall, the as-developed N-MoS 2 could be regarded as a promising cathode electrocatalyst for Li-O 2 batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CHINESE CHEMICAL LETTERS
·
2019
·
IF 3.839
Jinfeng Sun,Lingzhi Guo,Miaomiao Gao,Xuan Sun,Jinyang Zhang,Longwei Liang,Yang Liu,Linrui Hou,Changzhou Yuan
Herein, we first report one-step synthesis of uniform Mo 2 C microflowers (MCMFs) from low-cost precursors via industrialized solid-state strategy. With fine optimization in precursor ratio and pyrolysis temperatures, the as-fabricated MCMFs are assembled well with interconnected single-crystalline nanosheet subunits. More encouragingly, the resultant MCMFs are further highlighted as a competitive anode with robust and long-duration lithium-storage behaviors towards high-performance Li-ion batteries
研究领域:
材料科学
·
能源存储
✓ 已验证
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
CHEMISTRY-A EUROPEAN JOURNAL
·
2022
·Vol. 28
·期 71
·e202202410
·
IF 5.02
Yong Gao,Dani Zhang,Jingjing Li,Hao Gong,Cheng Jiang,Hairong Xue,Xianli Huang,Tao Wang,Jianping He
Graphical The P doped MoS 2 @Ni 3 S 2 nanorods array with core/shell structure was prepared through successive sulfuration and phosphorization strategies, which exhibits close catalytic activity to Pt/C, the overpotential is only 290 mV at 250 mA cm −2 . Electrocatalysis is the most promising strategy to generate clean energy H 2 , and the development of catalysts with excellent hydrogen evolution reaction (HER) performance at high current density that can resist strong alkaline and acidic electrolyte environment is of great significance for practical industrial application. Therefore, a P doped MoS 2 @Ni 3 S 2 nanorods array (named P-NiMoS) was successfully synthesized through successive sulfuration and phosphorization. P-NiMoS presents a core/shell structure with a heterojunction between MoS 2 (shell) and Ni 3 S 2 (core). Furthermore, the doping of P modulates the electronic structure of the P-NiMoS; the electrons transfer from the t 2g orbital of Ni element to the e g empty orbital of Mo element through the Ni−S−Mo bond at the Ni 3 S 2 and MoS 2 heterojunction, facilitating the hydrogen evolution reaction. As a result, P-NiMoS exhibits excellent HER activity; the overpotential is 290 mV at high current density of 250 mA cm −2 in alkaline electrolyte, which is close to Pt/C (282 mV@250 mA cm −2 ), and P-NiMoS can stably evolve hydrogen for 48 h.
研究领域:
材料科学
·
电催化
·
能源化学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
M.Y. Wang,X.L. Wang,Z.J. Yao,D. Xie,X.H. Xia,C.D. Gu,J.P. Tu
Tin oxide (SnO 2 ) has been widely used as an anode material for sodium-ion storage because of its high theoretical capacity. However, it suffers from large volume expansion and poor conductivity. To overcome these limitations, in this study, we have designed and prepared Mo-doped SnO 2 nanoflake arrays anchored on carbon foam (Mo-SnO 2 @C-foam with 38.41 wt% SnO 2 and 3.7 wt% Mo content) by a facile hydrothermal method . The carbon foam serves as a three-dimensional conductive network and a buffer skeleton, contributing to improved rate performance and cycling stability. In addition, Mo doping enhances the kinetics of sodium-ion transfer, and the interlaced SnO 2 nanoflake arrays is beneficial to promote the conversion reactions during the charge/discharge process. The as-prepared composite with a unique structure demonstrate a high initial capacity of 1017.1 mAh g −1 at 0.1 A g −1 , with a capacity retention over three times higher than that of the control sample (SnO 2 @C-foam) at 1 A g −1 , indicating a remarkable rate performance.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Pei Liu,Hongyu Chen,Caiyuan Zhao,Deng Long,Weijia Chen,Miao Lu,Xinyi Chen
A quadruple 2H transition metal dichalcogenide of platinum doped molybdenum selenide sulfide (MoSSe) has been achieved. The critical doping amount of Pt is estimated to be approximately 0.9 a.t.% to prevent the formation of a heterogeneous phase. It has been observed that the excess Pt beyond this critical doping level cannot be settled into the lattice of MoSSe but forms an independent metal phase of Pt nanoparticles, composing a heterostructure with MoSSe, in which the behavior of photogenerated electrons will be predominantly governed by metal Pt and transported along the pathways for gas production in the photocatalytic CO 2 reduction. However, as long as Pt can be located in the lattice of MoSSe, the elemental variety of Pt doped MoSSe has provided various active sites during the photocatalytic CO 2 reduction process, favoring the localized coupling of matching intermediates, consequently enhancing the production of high value-added liquid products. In essence, the successful integration of Pt into the 2H MoSSe lattice opens up diverse active sites, optimizing the photocatalytic performance on the selectivity of liquid production reduced from CO 2 .
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2022
·Vol. 48
·期 7
·2887-2901
·
IF 3.134
Huang Yan,Xing Wenxin,Zhou Liang,Tian Baozhu,Zhang Jinlong,Zhou Yi
Molybdenum oxide (MoO 3 ), as a transition metal oxide, has excellent catalytic activity, chemical stability, and high application value in the catalytic field. As a typical cocatalyst, noble metals, such as silver and gold, can be decorated with MoO 3 and improve their visible light absorption performance and photogenerated charge separation efficiency to achieve a higher light energy utilization rate. However, the high price of noble metals makes it challenging to realize large-scale industrial applications. Herein, a highly dispersed MoP quantum dot (QDs) decorated MoO 3 nanorods (PMO) was prepared by the co-calcination method to achieve efficient photocatalytic oxidation of target organic contaminants. Rhodamine B (RhB) and norfloxacin (NOR) were used as the model organic contaminants to evaluate the photocatalytic activity of the as-prepared composite photocatalysts. Based on the photoelectric performance and band structure analysis results, the enhancement mechanism of modification with MoP QDs in PMO was proposed. The introduction of MoP QDs in PMO can accelerate electron transfer and achieve a low recombination rate of photogenerated charges. Therefore, the photocatalytic degradation efficiency of RhB and NOR by PMO was higher than that of pristine MoO 3 nanorods and MoP QDs. The degradation efficiency of RhB and NOR could reach more than 97% and 100% within 40 min by PMO-5. Furthermore, photogenerated holes and hydroxyl free radical (·OH) as the primary active oxidants involved in the oxidation process of organic contaminants by PMO-5. PMO-5 still maintained vigorous catalytic activity after five cycles, indicating that it had good chemical stability. This work could provide a new strategy to construct a highly efficient photocatalyst for the efficient degradation of organic contaminants.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2015
·Vol. 51
·期 3
·1344-1353
·
IF 2.371
Yang Xia,Meng Nannan,Zhu Yuanchao,Zhou Yifeng,Nie Wangyan,Chen Pengpeng
In this work, molybdenum disulfide (MoS 2 ) nanosheets were employed to enhance the mechanical and thermal properties of chitosan (CS), which was one of the most promising biomaterials. In order to promote a homogeneous dispersion of MoS 2 and improved interface interactions between CS and fillers, carboxyl functionalization was subjected to the exfoliated MoS 2 nanosheets by chemical conjugation with thioglycolic acid before compositing with CS. Afterward, the CS/MoS 2 – g –COOH composite films were prepared by a simple solution blending method. Micromorphology characterizations showed that MoS 2 – g –COOH nanosheets dispersed much better than unmodified MoS 2 nanosheets, which was considered to be quite beneficial for the enhanced properties of CS nanocomposites. DMA results indicated that the mechanical properties of CS were improved by incorporating with MoS 2 – g –COOH nanosheets compared with neat CS and unmodified MoS 2 -filled CS. The thermal stability of CS/MoS 2 – g –COOH was also improved. This work demonstrated a promising route to prepare MoS 2 -based polymer nanocomposites with excellent performances.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 34
·10598-10604
·
IF 6.641
Xukun Zhu,Aolin Li,Di Wu,Peng Zhu,Haiyan Xiang,Song Liu,Jian Sun,Fangping Ouyang,Yu Zhou,Xiang Xiong
Crystal phase-engineering of two-dimensional (2D) transition metal dichalcogenides (TMDs) shows remarkable potential for various electronic, optoelectronic and catalytic applications. Here, a few-layer 1T′–2H MoTe2 lateral homo-junction has been obtained by using a facile chemical vapor deposition (CVD) method. In this CVD growth process, the in-plane phase evolution of the MoTe2 film can be dynamically controlled via tuning the contact between the film and Te vapor. Moreover, a local large-scale reversible phase transition of MoTe2 film through heat treatment in a hydrogen atmosphere is reported. During this heat treatment, two types of phase transition from 1T′ to 2H are observed at 500 °C and 750 °C respectively. The mechanism of this reversible phase transition is analysed by first principles calculations. The fabricated 1T′–2H–1T′ homojunction devices demonstrate that the hole mobility of 2H-MoTe2 is comparable with the exfoliated samples. This work in dynamic phase control of MoTe2 provides a pathway to exploring structural transformation of 2D materials and manufacturing novel phase-change electronic devices.
研究领域:
材料科学
·
物理化学
·
电子工程
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2021
·
IF 5.706
Qingting Zhang,Andreas Goldbach,Na Ta,Wenjie Shen
Hexagonal molybdates ( h-MoO 3 ) include abundant Mo vacancies that are charge-compensated by cations residing within one-dimensional channels. Hence, they present an intriguing structural motif for Mo catalysis which has been hardly explored for selective oxidation of olefins. We discovered that NH 4 + and Ag + -exchanged h-MoO 3 display surprisingly varied behavior during propylene oxidation. Acrolein and acrylonitrile are the main partial oxidation products with the latter forming due to NH 4 + consumption. The catalytic activity more than doubles upon introduction of Ag + which also enhances selectivity for the main products up to ∼60 %. Unexpectedly, the hexagonal frameworks transform into orthorhombic α-MoO 3 40−60 °C below their reported stability limits already. In addition, Ag 2 Mo 4 O 13 and Ag nanoparticles segregate in case of Ag + -containing h-MoO 3 frameworks. The resulting Ag/Ag 2 Mo 4 O 13 /α-MoO 3 composites catalyze propylene conversion into acrolein with even higher selectivity (∼80 %). Detailed analyses indicate that Ag 2 Mo 4 O 13 drives formation of this oxygenate over these composites.
研究领域:
催化化学
·
材料科学
·
无机化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）