JOURNAL OF SOLID STATE CHEMISTRY
·
2017
·
IF 2.299
Yuan-Zi Xu,Cheng-Zong Yuan,Xue-Ping Chen
To design highly efficient and low-cost electrocatalysts for oxygen evolution reaction (OER) is a great challenge for electrochemical water splitting. Here we introduce a simple and cost-effective strategy for one-step synthesis of a three-dimensional Ni 3 S 2 /MoS X (x is close to 3) nanosheets on Ni foam (NF) via a sovelthermal reaction. The electrochemical performance of the Ni 3 S 2 /MoS X nanosheets on NF has been investigated and exhibits superior OER electrocatalytic activity as well as excellent electrochemical durability. As a novel non-noble-metal OER catalyst operating in basic electrolytes, this 3D cathode exhibits an onset overpotential of as low as 165 mV, a Tafel slope of 67.5 mV dec −1 and remarkable long-term stability. This catalyst maintains its catalytic activity for at least 14 h and only affords 50, 100, and 150 mA cm −2 OER current densities at overpotentials of 215 mV, 265 mV and 305 mV respectively.
研究领域:
材料科学
·
电化学
·
能源化学
·
纳米科技
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 53
·期 5
·3603-3612
·
IF 2.599
Wang Min,Han Xiuxun,Zhao Yun,Li Jiajia,Ju Peng,Hao Zhaomin
Nano-sized materials have attracted tremendous attentions because of their promising practical applications and theoretical values. The nano-sized materials are able to not only enhance the intrinsic properties of their bulk counterparts but also give birth to new promising properties. Herein, heterojunctions consisted of graphene oxide (GO) and three different MoS 2 nanostructures, including nanoflowers, nanoparticles, and quantum dots, were constructed and used as photocatalysts in water splitting. The electrochemical behavior and photocatalytic performance of MoS 2 /GO composites were found closely related to the particle size and morphology of MoS 2 . Compared to bulk MoS 2 /GO photocatalyst, nano-sized MoS 2 /GO heterostructures exhibited obviously enhanced performance in photocatalytic hydrogen generation. Benefitting from the surface effect and the quantum confinement in MoS 2 quantum dots, MoS 2 quantum dots/GO displayed the highest photocatalytic activities. This study indicates that the decrease in the dimension of MoS 2 can effectively increase the photocatalytic hydrogen evolution performance of MoS 2 /GO heterostructures, and thus suggests preferred strategy to design other HER photocatalysts based on MoS 2 .
研究领域:
材料科学
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纳米科技
·
光催化
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能源化学
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半导体物理
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表面科学
·
可持续能源
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Xing-Liang Yin,Lei-Lei Li,Jian-Hua Jiang,Xin-Xin Du,Dong-Hui Pang,Jie Yang,Zhong-Jia Li,Yuan-Xu Wang,Xin-Yue Li,Da-Cheng Li,Jian-Min Dou
Photocatalytic H 2 evolution from water splitting offers an attractive scientific and technological method to address the energy and environmental crisis. In this study, noble-metal-free Zn 0.5 Cd 0.5 S@MoS 2 core@shell nanoheterostructures were elaborately designed and successfully synthesized. The visible-light-driven photocatalytic performance investigation shows that the Zn 0.5 Cd 0.5 S@MoS 2 exhibits a state-of-the-art H 2 evolution rate of 40.2 mmol g −1 h −1 far exceeding that of pristine Zn 0.5 Cd 0.5 S by more than 57 times. Moreover, thanks to the protection of MoS 2 shells, the Zn 0.5 Cd 0.5 S@MoS 2 can retain long-term stability in four-cycles of 24 h reactions. Furthermore, a tentative mechanism on H 2 generation was systematically investigated and proposed, which contributes to understand the enhanced photocatalytic activity of the Zn 0.5 Cd 0.5 S@MoS 2 heterostructures and may inspire the synthesis of other desirable catalytic systems.
研究领域:
材料科学
·
物理化学
·
能源化学
·
纳米催化
·
光化学
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 44
·16413-16420
·
IF 4
Hankun Tan,Lei Zhang,Kaiyue Gao,Li Sun,Yihe Zhang,Feng Xie
2H phase MoS2 with a two-dimensional nanostructure, high chemical stability and large theoretical capacity has been considered as a potential anode material for lithium-ion batteries. However, some practical problems hinder the direct use of 2H-MoS2 for lithium storage, such as its volume expansion effect that leads to capacity loss and its semiconductor properties that cannot provide sufficient conductivity. Herein, the surface of an MXene with abundant surface groups was modified with CTAB to promote its ability to adsorb MoO42− anions, and then 2H-MoS2 with a few layers was directly grown on the surface of MXene sheets vertically. Thanks to the conductive MXene sheets and the vertically-supported high-capacity MoS2 on them, the as-obtained composite MXene@MoS2 offers enhanced performance in specific capacity, long cycling stability and high rate capability. A reversible specific capacity of 1198 mA h g−1 was retained after 100 cycles at 200 mA g−1 and a specific capacity of 717 mA h g−1 was exhibited at 8000 mA g−1.
研究领域:
材料科学
·
电化学
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纳米科技
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能源存储
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半导体材料
✓ 已验证
DOI
高影响因子
RARE METALS
·
2023
·Vol. 42
·期 9
·3034-3045
·
IF 8.8
Ning Xue-Er,Jia Dian-Zeng,Li Shan-Hao,Khan Muhammad Farooq,Hao Ai-Ze
A highly efficient piezocatalyst of oxygen-incorporated MoS 2 (O-MoS 2 ) was designed and successfully synthesized via facile modulation of hydrothermal process temperature method. Remarkably, a superior piezocatalytic H 2 evolution rate of 46.1 μmol·g −1 ·h −1 in pure water and 921.0 μmol·g −1 ·h −1 in methanol solution is obtained on optimal O-MoS 2 -180 (with a hydrothermal process temperature of 180 °C), outperforming pristine MoS 2 and most of the reported other catalysts. Moreover, piezocatalytic activity of O-MoS 2 toward the degradation of organic pollutants depends on hydrothermal temperatures. The suitable temperature of O-MoS 2 -180 presents dramatically excellent piezocatalytic capacity compared with the pristine MoS 2 for degradation of methylene blue (MB) dye. The reaction rate constant of O-MoS 2 -180 reaches to 54.6 × 10 −3 min −1 , which is nearly 18 and 4-folds in contrast with pristine MoS 2 and O-MoS 2 -140 (with a hydrothermal process temperature of 140 °C), respectively. Simultaneously, it also manifests that O-MoS 2 -180 endows relatively high degradation efficiency (84.6% within 30 min) and excellent stability. Moreover, it is also demonstrated that optimal O-MoS 2 can dramatically promote charge carriers transport and separation. Furthermore, our theoretical calculation results suggest that the oxygen-incorporated can modulate the surface electronic state, enhance active sites as well as optimize the hydrogen adsorption Gibbs free energy of MoS 2 , thus extremely boosting piezocatalytic efficiency. Ultimately, an innovative piezocatalytic mechanism is proposed to reveal and expound the relationship between piezocatalytic property and oxygen-incorporated role. Graphical abstract
研究领域:
材料科学
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环境科学
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物理化学
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纳米催化
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能源材料
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表面科学
✓ 已验证
DOI
高影响因子
ACS Applied Engineering Materials
·
2023
·
IF 0
Wenjuan Zhang,Zhanqiang Li,Zijian Zhou,Fan Yang,Zhaoli Liu,Liyan Xue,Heng Chen,Yong Zheng
Negative thermal expansion (NTE) has been an attractive topic in engineering application and functional materials. However, the narrow operating-temperature window and the hygroscopicity have become bottlenecks restricting the NTE behavior. In this work, a design strategy for effectively ameliorating the NTE property, rare-earth based high-entropy (Y0.2Yb0.2Er0.2Tm0.2A0.2)2Mo3O12 (A = Sc, Gd, Lu) (HE-RE2Mo3O12) ceramics, is demonstrated for the first time. The as-synthesized HE-RE2Mo3O12 ceramics exhibit an orthorhombic crystal structure with a uniform distribution of rare-earth elements. Furthermore, the coefficients of thermal expansion (CTEs) of (Y0.2Yb0.2Er0.2Tm0.2Sc0.2)2Mo3O12 and (Y0.2Yb0.2Er0.2Tm0.2Lu0.2)2Mo3O12 ceramics are −4.96 × 10–6 K–1 and −4.58 × 10–6 K–1 with high service temperatures (100–800 °C). Fascinatingly, the large ionic radius Gd(III) is incorporated into the orthorhombic (Y0.2Yb0.2Er0.2Tm0.2Gd0.2)2Mo3O12 ceramic, and a lower negative thermal expansion property (−0.76 × 10–6 K–1) with broad operating-temperature window (100–800 °C) is achieved. Remarkably, the antihygroscopicity ability of the high-entropy specimens is improved, and the water absorption of such ceramics is reduced by 61.4%. Moreover, the improvements of the tunable thermal expansion and antihygroscopicity property of HE-RE2Mo3O12 ceramics are ascribed to the lattice distortion effect. The present study provides a promising strategy for the development of NTE functional materials.
研究领域:
材料科学
·
无机化学
·
固态物理学
·
热工学
✓ 已验证
DOI
Desalination and Water Treatment
·
2024
·
IF 1
Jian-jun Lian,Meng Wu,Bo Chen,Lin Zhang,Fan-jie Zhou,Qiao-ping Kong,Jing Wu
Although iron sulfide (FeS) has been used to remove heavy metals from the environment, its capability for remediation of molybdenum (Mo) contaminated soil and some important influencing factors are still unclear. The purpose of this study was to investigate whether soil Mo(VI) contamination could be immobilized by using nano-FeS. The effects of FeS dosage, natural organic matter (NOM), and inorganic salts on soil Mo(VI) immobilization properties were compared and analyzed. The results showed that the addition of FeS significantly reduced the leaching of Mo in the soil. The amount of Mo leaching dropped from 87.66 to 2.20 mg/L when the molar ratio of FeS to Mo(VI) increased from 1:1 to 50:1. It was discovered that the major two mechanisms for the immobilization of soil Mo(VI) by FeS were adsorption and reduction. Soil Mo leaching was promoted with the existence of NOM, but the addition of SO 4 2– and H 2 PO 4 – prevented soil Mo(VI) leaching. Mo leaching from soil that was polluted with Mo(VI) and included humic acid, salicylic acid, SO 4 2– , or H 2 PO 4 – was reduced by 116.41–77.54 mg/L, 116.41–112.72 mg/L, 116.41–72.45 mg/L, and 116.41–84.39 mg/L, respectively, after FeS treatment. Meanwhile, the cabbage mustard growth experiments findings indicated that FeS particles have a significant field application potential for Mo(VI) contaminated soil remediation due to their high Mo(VI) immobilization efficiency.
研究领域:
环境科学
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纳米技术
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土壤修复
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重金属污染
·
环境化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2016
·Vol. 42
·期 4
·2045-2053
·
IF 3.205
Jing-Jia Zhang,Xu-Lei Sui,Lei Zhao,Li-Mei Zhang,Da-Ming Gu,Zhen-Bo Wang
Molybdenum trioxide (MoO 3 ) has been considered an advanced auxiliary support for Pt nanoparticle anchorage due to its excellent activity and stability. Nevertheless, its non-conductivity property still impedes its applications in electrocatalytic fields. Thus, the MoO 3 and carbon composite of a nanostructure is synthesized through sintering process and served as an efficient co-support for Pt-based anode catalyst in this paper. The electrochemical measurements demonstrate that Pt/MoO 3 -C catalyst shows higher catalytic activity and stability than the as-prepared Pt/C. Significantly, it exhibits 1.95 times higher activity and 2.36 times better durability for methanol oxidation when compared with commercial Pt/C. The remarkably enhanced performance of this novel Pt/MoO 3 -C catalyst for methanol electrooxidation can be ascribed to the abundant Pt nucleation active sites, uniformly dispersed Pt nanoparticles and the strong metal-support interaction between Pt and MoO 3 -C. These outstanding properties suggest Pt/MoO 3 -C a promising catalyst for practical application of fuel cell.
研究领域:
电催化
·
纳米材料
·
能源化学
·
燃料电池
·
电化学
✓ 已验证
DOI
高影响因子
Small
·
2023
·Vol. 20
·期 7
·2306576
·
IF 13.3
Wenbo Liu,Ning Wang,Yongjun Wu,Qianyi Zhang,Xiaoyan Chen,Yanmei Li,Rui Xu
The widespread acceptance of nonaqueous rechargeable metal–gas batteries, known for their remarkably high theoretical energy density, faces obstacles such as poor reversibility and low energy efficiency under high charge–discharge current densities. To tackle these challenges, a novel catalytic cathode architecture for Mg–CO 2 batteries, fabricated using a one-pot electrospinning method followed by heat treatment, is presented. The resulting structure features well-dispersed molybdenum carbide nanodots embedded within interconnected carbon nanofibers, forming a 3D macroporous conducting network. This cathode design enhances the volumetric efficiency, enabling effective discharge product deposition, while also improving electrical properties and boosting catalytic activity. This enhancement results in high discharge capacities and excellent rate capabilities, while simultaneously minimizing voltage hysteresis and maximizing energy efficiency. The battery exhibits a stable cycle life of over 250 h at a current density of 200 mA g −1 with a low initial charge–discharge voltage gap of 0.72 V. Even at incredibly high current densities, reaching 1600 mA g −1 , the battery maintains exceptional performance. These findings highlight the crucial role of cathode architecture design in enhancing the performance of Mg–CO 2 batteries and hold promise for improving other metal–gas batteries that involve deposition–decomposition reactions.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
ACTA PHYSICO-CHIMICA SINICA
·
2023
·
IF 10.9
Ye Wang,Ruixiang Ge,Xiang Liu,Jing Li,Haohong Duan
Nucleophile oxidation reaction (NOR) is emerging as a significant approach for the sustainable production of value-added chemicals. Among the various types, electrocatalytic glycerol oxidation reaction (GOR) stands out as a crucial method for producing C 1 to C 3 chemicals including formic acid (FA). Nonnoble-metal-based (oxy)hydroxides have found extensive use in GOR, yet achieving industrially-demanded current densities (> 300 mA·cm −2 ) at moderate potentials remains a challenge. It is well documented that GOR catalyzed by (oxy)hydroxides follows an indirect oxidation mechanism. Specifically, the nucleophile, glycerol, undergoes oxidation by the electrogenerated oxyhydroxides with electrophilic adsorption oxygen. Therefore, comprehending the evolution of the electrocatalyst in GOR is critically important. In this paper, we have developed molybdenum-doped nickel oxyhydroxides (Mo-NiOOH) through cyclic voltammetry (CV) activation of nickel molybdate (NiMoO 4 ). We demonstrated that Mo species leach from NiMoO 4 , and the resulting Mo-NiOOH retains the nanosheet array morphology of NiMoO 4 . We subjected the freshly prepared Mo-NiOOH to systematic characterizations employing techniques such as scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) mapping, Raman spectroscopy, inductively coupled plasma-mass spectrometry (ICP-MS), and X-ray photoelectron spectroscopy (XPS). The above structural characterizations confirm that Mo-NiOOH inherits the nanosheet array morphology of the NiMoO 4 precursor with reduced Mo content, thereby indicating the phase reconstruction from oxides to oxyhydroxides post CV activation. Furthermore, the Ni 3+ /Ni 2+ ratio in Mo-NiOOH surpasses that in NiOOH derived from CV activation of Ni(OH) 2 . Mo-NiOOH exhibits elevated electrochemically active surface areas (ECSAs) and a higher Ni 3+ /Ni 2+ ratio compared to NiOOH obtained through CV activation of Ni(OH) 2 , facilitating the Mo-NiOOH exhibits higher ratio of Ni 3+ /Ni 2+ , higher electrochemically active surface areas (ECSAs) than NiOOH, and facilitated oxidation of Ni 2+ to Ni 3+ . Consequently, Mo-NiOOH requires a lower applied potential than NiOOH (1.51 V versus 1.84 V vs . reversible hydrogen electrode (RHE)) to achieve a high current density (400 mA·cm −2 ). Additionally, Mo-NiOOH demonstrates higher Faradaic efficiency towards formate (FE formate ) in contrast to NiOOH (84.7% versus 59.6%), indicating enhanced carbon-carbon (C—C) bond cleavage due to Mo doping. Multi-potential step (STEP) experiments indicate that GOR catalyzed by NiOOH and Mo-NiOOH follows a similar indirect oxidation mechanism mediated by oxyhydroxides. Operando electrochemical impedance spectroscopy (EIS) and in situ Raman spectroscopy confirmed that Mo doping in NiOOH accelerates GOR kinetics and the oxidation of Ni 2+ to Ni 3+ , contributing to the higher activity and formate selectivity of Mo-NiOOH than NiOOH. The strategy of surface modulation of oxyhydroxides through leaching of soluble anions offers guidelines for the rational design of high-performance NOR electrocatalysts. Download: Download high-res image (72KB) Download: Download full-size image
研究领域:
化学
·
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2013
·
IF 2.206
Yan Wang,Chenghong Zhou,Wucong Wang,Yaping Zhao
A facile and general approach was developed to exfoliate layer materials to produce two-dimensional atomic crystals. A single and few layers of BN, MoS2, and WS2 were obtained via directly exfoliating their powder materials using supercritical CO2 assisted with ultrasound. The effects of supercritical CO2 coupled with ultrasound play a key role in the exfoliation process. The layer numbers and sizes of the BN, MoS2, and WS2 can be easily controlled by adjusting the power and the time of ultrasonication. The AFM images suggest single-layered BN, MoS2, and WS2 were produced, respectively. Their lateral sizes are about 0.5–2 μm, and almost 90% of the BN sheets are less than five layers. The electric diffraction patterns demonstrate that the crystallinities of the produced samples remained the same as that of the raw material during the exfoliating process. This novel technique is cost-effective and scalable, and can be widely used in the production of two-dimensional atomic crystals with high quality.
研究领域:
材料科学
·
纳米科技
·
物理化学
·
表面科学
·
凝聚态物理
✓ 已验证
DOI
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2021
·
IF 5.234
Dongjing Jiang,Zhi Dong,Zunfeng Du,Qian Zhao,Hui Wang,Zongqing Ma
It is an effective way to enhance the mechanical properties of Mo alloy by adding oxide strengthening phase. However, the oxide second-phase particles in oxide dispersion strengthened Mo (ODS-Mo) alloy prepared via traditional mechanical alloying generally coarsen at grain boundaries (GBs), greatly weakening their strengthening effect . To solve this problem, single and multiple oxide particles strengthened Mo alloys are developed via wet chemical method and subsequent low-temperature sintering in this work. After doping CeO 2 , the compressive yield strength (340.3 ± 8.1 MPa) and hardness (410 ± 13 HV) of Mo–Y 2 O 3 (Mo–Y) alloy were decreased by 17.9% and 22.7%, respectively. However, after doping La 2 O 3 , the compressive yield strength and hardness of Mo–Y alloy are further increased by 89.4% and 21.0%, respectively. According to microstructure observation and theoretical calculation, CeO 2 doping decreases the volume fraction of intergranular oxide particles and weakens interfacial drag force, finally promoting Mo grain growth and worsening the mechanical properties of Mo–Y alloy. In contrast, after doping La 2 O 3 , more oxide particles are dispersed at GBs, and their coarsening are inhibited. This results in a stronger Zener force. Moreover, interfacial drag force can also be increased through doping La 2 O 3 . Two forces synergistically hinder GBs migration. Therefore, La 2 O 3 doping leads to Mo grain refinement and ultimately enhances the mechanical properties of Mo–Y alloy. These results in our work can provide theoretical guidance for choosing proper oxide dopants to prepare ODS alloys with excellent mechanical properties.
研究领域:
材料科学
·
金属学与热处理
·
结构材料
·
粉末冶金
·
固态相变
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）