LANGMUIR
·
2023
·
IF 3.9
Yao Zhang,Wenjing Wang,Xinliang Chen,Qiaoling Li,Chengcheng Yu
Hydrogen is a valuable clean energy source, and electrolysis to produce hydrogen from water is a crucial component. However, a major problem of hydrogen generation by electrolysis is its large overpotential and poor economics. To reduce the overpotential, we mainly use nickel foam and Co–Mo ions as feedstock and create an efficient catalytic material by electrodeposition. The Co–Mo interaction improves the current efficiency. In 1 mol/L NaOH solution, the overpotential of the Co–Mo-NF composites was low when the current density is −10 mA/cm2, with the best value reaching 45.3 mV, which is less than those of Co-NF (94.4 mV) and Mo-NF (88.2 mV). All deposits had similar Tafel slopes in the 77.9 mV/decade range. The catalyst does not just have a favorable effect on hydrogen formation but also has a surprisingly high double-layer capacitance (up to 180 mF/cm2) and good stability. This research provides an impactful approach for developing a non-precious metal HER catalyst for industrial hydrogen production.
研究领域:
材料科学
·
能源化学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CURRENT APPLIED PHYSICS
·
2024
·
IF 2.4
Weiqiang Cai,Zijian Sun,Jiaying Xu,Jingyun Zou,Xiying Ma,Xiaoyu Zhang
Two-dimensional (2D) MoS 2 has attracted considerable attention for their significant potential application in high-frequency electronic devices. In this work, erbium doped MoS 2 (Er:MoS 2 ) film is prepared by chemical vapor deposition . The structures and binding energy are studied by X-ray photoelectron spectroscopy indicating the substitution of Er atoms into MoS 2 lattices. The complex permittivity of the film is measured by the microstrip line up to the frequency of 4 GHz. The high frequency permittivity ε′ of MoS 2 film is 4.11 and ε′ increases about 28% when the Er doping amount is 0.83 at% (atomic percentage). The permittivity of Er:MoS 2 film is higher than that of MoS 2 film, which is mainly due to the enhanced polarization of Er:MoS 2 film. The permittivity ε′ of Er:MoS 2 film increases with the increase of Er doping (0∼0.83 at%). It is believed that Er:MoS 2 film has great potential application in tunable electromagnetic devices.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 64
·59816-59822
·
IF 3.289
Song Hao,Bingchu Yang,Yongli Gao
The fracture behavior of two-dimensional polycrystalline molybdenum disulfide (MoS2) films is essential to device performance and has attracted tremendous attention in recent years. Here, we investigate the mixed intergranular and transgranular fracture behaviors of CVD-grown polycrystalline MoS2 atomic layers using multiple techniques. The underlying mechanism is proposed to be that micro-cracks initially nucleate at grain boundary junctions and propagate along with the grain boundaries, resulting in intergranular fracture behavior. On the other hand, as-existed sulfur vacancies serve as crack nuclei and propagate along energy preference directions through Mo–S bond breaking, resulting in transgranular fracture behavior. Lattice shrinking induced compressive, rather than tensile strain is residual in fractured MoS2 microflakes, which enlarges the corresponding bandgap by ∼200 meV. Our work deepens the understanding of the fracture behaviors of polycrystalline MoS2 atomic layers and demonstrates a promising method to engineer the strain in MoS2-like atomically-thin materials to further tune their physical properties.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Nan Xin,Guihua Tang,Tian Lan,Yifei Li,Jiawei Kou,Min Zhang,Xin Zhao,Yinan Nie
Two-dimensional (2D) layered transitional metal dichalcogenides (TMDCs) semiconductors like MoS 2 have been predicted to be promising thermoelectric (TE) materials due to their high carrier mobility. However, the TE performance of MoS 2 film is severely hindered by the high in-plane thermal conductivity. In this work, based on reversing grain orientation reducing in-plane thermal conductivity, Cu doping is used to increase the carrier concentration for optimization of electrical properties. The Cu-doped MoS 2 films have prepared by magnetron sputtering (MS) combined with post-sulfurization chemical vapor deposition (CVD). The composition, structure, thermal and electrical properties were systematically investigated by experiment and DFT calculation. Results indicate that Cu doping may slightly reduce the Seebeck coefficient of MoS 2 film, but effectively narrow the band gap and improve the carrier concentration, thus improving the electrical performance. In addition, MS combined with CVD method can effectively increase the degree of grain misorientation, making the in-plane thermal conductivity of Cu-doped MoS 2 film much lower. Combined with the above optimization, a promising maximum ZT value among TMDCs 0.137 at 425 K was obtained in Cu 6 -MoS 2 film. This study provides a new strategy to synchronously regulate the thermal and electrical properties of TMDCs films to improve their thermoelectric performances.
研究领域:
材料科学
·
热电学
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2022
·
IF 18.027
Enze Wang,Zekun Chen,Run Shi,Zixin Xiong,Zeqin Xin,Bolun Wang,Jing Guo,Ruixuan Peng,Yonghuang Wu,Chenyu Li,Hongtao Ren,Xiaoyan Li,Kai Liu
Dynamic engineering of buckling deformation is of vital importance as it provides multiphase modulation of thin film devices. In particular, dynamic switch of buckles between one-dimensional (1D) and two-dimensional (2D) configurations in a single film system on rigid substrates is intriguing but very challenging. The current approach to changing buckling configuration is mainly achieved by varying the built-in stress at the film–substrate interface, but it is difficult to realize dynamic engineering on rigid substrates. Herein, we report a dynamic engineering of buckling deformation in MoS2 thin films by humidity-tuned interfacial adhesion. With the change of humidity, the MoS2 thin films deform from 1D telephone-cord buckles to 2D web-like buckles due to the hydrophilic nature of both MoS2 and substrate. Such 1D-to-2D evolution of buckles is attributed to the weakened interfacial adhesion of mixed deformation modes induced by humidity, which is verified by finite-element modeling. These buckled films further find potential applications as patterned templates for liquid condensation and sensing units for tactile sensors. Our work not only demonstrates the humidity-controlled dimensionality engineering of buckles in MoS2 thin films but also sheds light on the functional applications of buckled films based on their profile features.
研究领域:
材料科学
·
工程学
✓ 已验证
DOI
PubMed
高影响因子
ECS Journal of Solid State Science and Technology
·
2024
·Vol. 13
·期 8
·084007
·
IF 1.8
Lianfeng Hu,Yingjie Wang,Qiancheng Sun,Chun-Feng Hu,Haijun Cheng,Xin-Ping Qu
The impact of ceria abrasives on the chemical mechanical polishing (CMP) of molybdenum (Mo) films was examined in alkaline slurries utilizing H2O2 as an oxidizer and ceria abrasives. The static etching rate (SER) decreased after the addition of ceria abrasives to the alkaline H2O2-based slurry, while the removal rate (RR) increased except for that of the slurry at pH 9. At pH 9, following the etching of the Mo film in an H2O2 solution with ceria, the surface became coated with MoO3 and Ce2Mo4O15 species. These species originated from the interaction between ceria, H2O2, and molybdic acid. The Ce2Mo4O15 particles envelop the MoO3 surface, thereby preventing the etching of loose MoO3 and hindering further oxidation of Mo to MoO3. This process effectively reduces the RR of Mo. Utilizing ceria slurries at appropriate pH values facilitates achieving a smooth surface with a reasonable RR.
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
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Yu Huang,Yihui Wu,Zejie Zhang,Lanlan Yang,Qianhao Zang
Exploring cost-effective and high-efficiency noble-metal free electrocatalysts for oxygen evolution reaction (OER) are of critical importance to the area of renewable energy storage and conversion systems. Herein, Ni–Fe–Mo films were fabricated via electrodeposition method with a very high current density. The film exhibits excellent activity towards OER with a overpotentials of 306 mV at current density of 10 mA·cm −2 and a lower Tafel slope of 77.1 mV·dec −1 under alkaline conditions (30 wt.% KOH). The synergistic effect of the Mo, Ni, and Fe contribute the improved catalytic activity for OER.
研究领域:
材料科学
·
可再生能源
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Ruijing Wang,Peng Sun,Huanwen Wang,Xuefeng Wang
At high current density during the hydrogen evolution reaction (HER) process, the active layer for most of MoS 2 -based electrocatalysts suffers from pulverizations and easily drops-off due to a high rate of bubble formation and strong stirring. Herein, a facile pulsed laser deposition (PLD) method is used to fabricate amorphous molybdenum disulfide (MoS 2 ) films on gold-coated carbon cloth (Au/CC) for HER test. Because of the strong anchoring interaction between MoS 2 catalysts and the Au/CC substrate during the underlying laser ablation process, remarkable stability with 5000 continuous HER cycles has been achieved in the acid media. Furthermore, the as-obtained MoS 2 catalyst shows a small Tafel slope of 48 mV decade −1 , an onset overpotential of 132 mV and the overpotential of 180 mV at a current density of 10 mA cm −2 . These results demonstrate that PLD is a very promising technique for making the film electrodes for application in electrocatalytic process.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2018
·
IF 4.229
Yihui Wu,Hanwei He
Designing and synthesizing of efficient and inexpensive bifunctional electrocatalysts for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is one of the current research topics. In this study, Ni Fe C Mo film in nickel mesh substrate is prepared by one-step direct-current electrodeposition method. The obtained Ni Fe C Mo film shows the excellent electrocatalytic activity , which only requires overpotentials of 254 mV for HER and 256 mV for OER to drive current density of 10 mA cm −2 , with corresponding Tafel slopes of 163.9 and 60.3 mV·dec −1 in 30% KOH medium, respectively. Moreover, Ni Fe C Mo film only needs a low cell voltage of 1.61 V to drive current density of 10 mA cm −2 in an alkaline electrolyzer . Such remarkably HER and OER properties of Ni Fe C Mo alloy is attributed to the increased effective electrochemically active surface area and the synergy effect among Ni, Fe, C and Mo.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Energy Materials
·
2022
·Vol. 12
·期 11
·2103394
·
IF 29.698
Zheng Bo,Xiangnan Cheng,Huachao Yang,Xinzheng Guo,Jianhua Yan,Kefa Cen,Zhaojun Han,Liming Dai
Manufacturing electrode films at an industrial-level submillimeter thickness (≈100 µm) with superior volumetric performance is of practical significance for the commercialization of miniaturized supercapacitor systems. This work proposes a commercially scalable solvated-ion-intercalated hydrothermal strategy to demonstrate a record-high volumetric capacitance (511.29 F cm −3 ) for supercapacitors based on an industrial-level submillimeter MoS 2 film electrode (94.2 µm). The intercalated solvated Li + ions increase the amount of negative surface charge and reduce the formation energy of 1T MoS 2 , leading to a high metallic phase content of 82.7% with enhanced electrical conductivity. Together with the expanded interlayer distance (≈1.23 nm), this allows rapid electron transfer and ion transport in the excessively stacked ultrathick MoS 2 film to be simultaneously realized. Thus, the as-fabricated MoS 2 ||graphene/carbon nanotube asymmetric supercapacitor presents both high energy and power densities, outperforms those of commercial devices, including supercapacitors with submillimeter-thick electrodes and even micrometer-thick electrodes.
研究领域:
材料科学
·
电化学
·
储能技术
✓ 已验证
产品关联
DOI
高影响因子
iScience
·
2021
·
IF 5.458
Manzhang Xu,Jiuwei Gao,Juncai Song,Hanxin Wang,Lu Zheng,Yuan Wei,Yongmin He,Xuewen Wang,Wei Huang
The two-dimensional (2D) transition metal dichalcogenides (TMDs) are promising flexible electronic materials for strategic flexible information devices. Large-area and high-quality patterned materials were usually required by flexible electronics due to the limitation from the process of manufacturing and integration. However, the synthesis of large-area patterned 2D TMDs with high quality is difficult. Here, an efficient and powerful pulsed laser has been developed to synthesize wafer-scale MoS 2 . The flexible strain sensor was fabricated using MoS 2 and showed high performance of low detection limit (0.09%), high gauge factor (1,118), and high stability (1,000 cycles). Besides, we demonstrated its applications in real-time monitoring of health-related physiological signals such as radial artery pressure, respiratory rate, and vocal cord vibration. Our findings suggest that the laser-assisted method is effective and capable of synthesizing wafer-scale 2D TMDs, which opens new opportunities for the next flexible electronic devices and wearable health monitoring.
研究领域:
材料科学
·
生物医学工程
·
柔性电子学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 20
·6900-6905
·
IF 7.059
Yishuo Hu,Xiangbin Zeng,Tingting Ren,Yonghong Xiao,Yang Zeng,Wenzhao Wang,Zhenyu Guo,Wen Jin,Shibo Wang,Jichang Lu,Yirong Zeng
Recently, two-dimensional MoS2 has attracted interest for applications in electronics, optics, energy storage, and catalysis. Furthermore, n-type or p-type doping of MoS2 can result in improved film properties, thereby expanding the range of applicability. However, the rapid preparation of large-scale MoS2 films and the effective doping of such films remain challenging. Herein, we report on a one-step growth method called pulsed laser-induced synthesis (PLIS) that can resolve these challenges and can quickly (5–10 min) prepare centimeter-scale MoS2 films directly and selectively on a substrate. A continuous length of up to 1.412 cm can be achieved with MoS2 films prepared by the described methods. Moreover, in situ doping of noble metals (Au, Pt, and Pd) to convert MoS2 into a p-type semiconductor was realized, consistent with the results obtained from first-principles calculations. The STEM images reveal that the phenomena of surface modification and cation substitution occur in the doped MoS2 films. The doped MoS2 films were further processed into a p-type field effect transistor with an on/off ratio of 105. Importantly, this technique can be applied to other transition metal dichalcogenides (TMDCs) while employing various doping elements; this scheme provides an innovative method for upscaling production and large-area doping of TMDC thin films.
研究领域:
材料科学
·
纳米技术
·
半导体物理
✓ 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）