SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2019
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IF 6.019
Zhenzhen Guo,Zihe Chen,Zhuoxun Shi,Jingwen Qian,Jinhua Li,Tao Mei,Jianying Wang,Xianbao Wang,Ping Shen
Solar vapor generation provides an ideal pathway for water remediation by using abundant natural resource--solar irradiation. Great progresses have been made in increasing solar steam efficiency by macrostructure design and microscopic morphology regulation. Here, we report a stable 1T phase engineering of molybdenum disulfide (MoS 2 ) for enhanced solar vapor generation. A flower-like 1T/2H MoS 2 (1T/2H FMoS 2 ) was developed by a simple one-step hydrothermal method . The 1T/2H FMoS 2 showed enhanced broadband sunlight absorption covering solar spectrum from 300 to 2500 nm. A high evaporation rate of 1.52 kg m −2 h −1 and 20% increase of the photo-to-heat conversion efficiency compared to that of only 2H MoS 2 were achieved for 1T/2H FMoS 2 by introducing 1T phase and a hierarchical flower-like structure. More importantly, the 1T/2H FMoS 2 possessed benign phase stability with a high phase conversion temperature 253 °C. As a photothermal material, it provides an ideal solar-receiver for high efficient solar clean water generation, to alleviate drinking water crisis and energy risk.
研究领域:
材料科学
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能源科学
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环境科学
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DOI
高影响因子
ACS Nano
·
2026
·
IF 17.3
Xuwu Xiao,Cheng Cheng,Cuizhi Chen,Lituo Zheng,Dong Wei,Mingdeng Wei,Zhensheng Hong
Photobatteries promise a revolutionary approach to both harvesting and storing solar energy; however, their development has been limited by rapid carrier recombination and the absence of interfaces to direct charge flow effectively. Here, we construct an in-plane 1T/2H-MoS2 heterostructure chemically connected onto carbon nanotubes (CNTs) that integrate metallic 1T-MoS2, semiconducting 2H-MoS2, and conductive CNTs into a multi-interface framework. This architecture generates a built-in electric field across the 1T/2H-MoS2 junction and provides continuous directional pathways for rapid electron extraction and transfer. Ultrafast transient absorption spectroscopy identifies long-lived charge-separated states with a prolonged carrier lifetime (τ2 ≈ 731 ps) in the 1T/2H-MoS2 heterostructure, more than double that of 2H-MoS2@CNTs. Meanwhile, Kelvin probe force microscopy reveals a pronounced light-induced potential gradient (∼75 mV), providing direct nanoscale evidence of efficient carrier extraction. These synergistic effects promote efficient charge separation and transport, enabling superior photoassisted lithium-ion storage. The 1T/2H-MoS2@CNTs-based lithium-ion photobattery demonstrates an increased storage capacity from 493.7 to 624.9 mAh g–1 at 0.5 A g–1 under illumination and a maximum photoconversion and storage efficiency of 6.62%, achieving an external voltage-free self-charging process. This study underscores rational multi-interface engineering to effectively integrate light harvesting and electrochemical storage for self-charging energy systems.
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 12
·期 5
·2760-2770
·
IF 11.9
Binchao Shi,Yue Wang,Ertai Liu,Shilin Mei,Chang-Jiang Yao
The fast capacity decay and limited cycling life are the two main issues that hinder the practical applications of lithium–sulfur batteries. They are mainly caused by the shuttle effect of polysulfide species and the growth of big lithium dendrites occurring separately on the cathode and anode sides. To simultaneously tackle these problems, we explore a multifunctional interlayer integrating the aligned nanochannel structure of an anodic aluminum oxide (AAO) membrane with porous 1T MoS2 nanotubes (namely MoS2@AAO). Benefiting from the high electronic conductivity, sulfiphilic and lithiophilic properties of 1T MoS2, and the positive surface plus low tortuosity of the straight channels of AAO, the designed interlayer not only guarantees rapid ion/electron transfer and efficacious suppression of the polysulfide shuttle, but also achieves uniform and stable lithium deposition during cycling. Consequently, the MoS2@AAO interlayer exhibits a high capacity retention of 99.6% at 0.2C after 500 cycles and 90.6% at 1.0C after 1000 cycles. The prototype cathode with a sulfur loading of 5 mg cm−2 was also investigated, which exhibited over 96% retention of the initial discharge capacity at 0.1C after 50 cycles. This work provides a new solution for simultaneously stabilizing both the lithium anode and sulfur cathode via an integrating approach.
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
·
2025
·
IF 8.3
Yang Kuang,Gang Zhao,Tengrui Feng,Luchao Zhao,Qi Wu
Molybdenum diselenide (MoSe 2 ) has been extensively researched as a promising electrocatalyst for hydrogen evolution reaction (HER). However, its intrinsic properties are still constrained by insufficient exposure of the active site and poor electrical conductivity. Therefore, it is essential to synthesize metallic phase MoSe 2 (1T-MoSe 2 ) with abundant active sites in order to further enhance its HER performance. To achieve this goal, Co-doped MoSe 2 nanosheets with a high 1T phase concentration were synthesized using a simple one-step hydrothermal method. Experiments and theories have demonstrated that Co doping induces the phase transition of MoSe 2 from the 2H to the 1T phase. In a 1 M KOH solution, the overpotential of Co-doped 1T-MoSe 2 at 10 mA cm −2 is only 218 mV, which is significantly superior to that of pure MoSe 2 (287 mV), and the Tafel slope is lower at 115.7 mVdec −1 . Furthermore, the nanosheets exhibited high stability, retaining their catalytic properties even after 200 h of continuous use. Density functional theory (DFT) calculations indicate that Co doping enhances the electrical conductivity and the achieves a minimal value of ΔG H∗ (only about 0.094 eV). This work proposes a strategy to design highly efficient electrocatalysts based on 1T-MoSe 2 .
研究领域:
材料科学
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电化学
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纳米技术
·
能量转换
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Mairman Muska,Ye Wang,Jing Yang,Lin Ma,Qian Xu,Honghe Ding,Junfa Zhu,Qing Yang
With a dual strategy of phase-interface engineering, monolayer (1L)–1T-WSe2 integrated with Ag2Se nanoparticles (NPs) is in situ fabricated as quasi-monolayer Ag2Se/1L–1T-WSe2 hybrid nanosheets via a one-pot oleylamine-colloidal reaction. The Ag2Se NPs direct the growth of 1L–1T-WSe2 nanosheets forming the quasi-monolayer hybrid nanosheets by lodging in the interlayer spaces of WSe2 while the Ag2Se NPs being in a superionic conductor state diffuse rapidly and prevent the growth of piled-up multilayered WSe2 nanosheets. Due to the formation of quasi-monolayer Ag2Se/1L–1T-WSe2 nanosheets, many more side edges are exposed. Intensive studies illustrated that the quasi-monolayer Ag2Se/1L–1T-WSe2 hybrid nanosheets provide increased surface area and active sites as compared with isolated Ag2Se and WSe2. The hybrid nanosheets demonstrated excellent catalytic properties for hydrogen evolution reaction (HER) with overpotentials (η10) of 163 and 140 mV in acidic and basic conditions, respectively, and an outstanding alkaline supercapacitance of 1674 F g–1 at 1 A g–1. Meanwhile, X-ray photoelectron spectroscopy (XPS) and ultraviolet photoelectron spectroscopy (UPS) determinations revealed that the quasi-monolayer hybrid nanosheets with enhanced electronic modulation could promote H+ adsorption/H2 desorption and accelerate the transport and separation of charge on the interface of heterostructured catalyst along with the electrode surface so as to exhibit outstanding electrochemical performances for HER and pseudocapacitance.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Green Energy & Environment
·
2020
·
IF 6.395
Huanran Li,Xiaobo Han,Suyu Jiang,Lili Zhang,Wei Ma,Renzhi Ma,Zhen Zhou
The layered materials have demonstrated great prospects as cost-effective substitutes for precious electrocatalysts in hydrogen evolution reaction. Research efforts have been devoted to synthesizing highly conductive MoS 2 with the substantial cardinal plane and edge active sites. Here, we successfully synthesized a hierarchical 1T/2H–MoS 2 with sodium ion insertion via a facile hydrothermal method. The contents of the 1T-phase can be flexibly controlled by different hydrothermal temperatures (160 ∼ 200 °C). And the modified uniformly dispersed 1T/2H–MoS 2 nanospheres with different d spacings were designed to enhance the electrocatalytic efficiency by adding SiO 2 and through the ion exchange process of NaOH and HF solution. The as-synthesized Na + intercalated 1T-MoS 2 nanosphere with an expanded interlayer of 0.95 nm obtained at 160 °C exhibits a prominent electrocatalytic performance of hydrogen evolution reaction with a comparable overpotential of 255 mV and a remarkably small Tafel slope of 44 mV/decade. Therefore, this study provides a facile and controllable strategy to yield interlayer-expanded 1T-MoS 2 nanospheres, making it a potentially competitive hydrogen evolution catalyst for the hydrogen cell.
研究领域:
材料科学
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能源化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Jinzhu Wu,Yue Liu,Yuan Yao,Yanbin Shao,Xiaohong Wu
Superabsorbers can find application in the fields of solar cells, blackbody radiation, thermal control systems, and stray light elimination devices. Herein, graphene-like 2H/1T-molybdenum diselenide (MoSe 2 ) was synthesized via a hydrothermal method and shows superhigh solar absorption (~99%) within a range of 200–2500 nm. In the synthesis, selenium dioxide (SeO 2 ) was used as a Se source instead of Se powder, which plays an important role in manipulating the graphene-like morphology and the multiphasic composition of the MoSe 2 . Consequently, the as-prepared MoSe 2 nanoflowers possess desired band structure and abundant pores and pore channels for strong optical absorption. DFT calculations clarify that the 1T-MoSe 2 primarily contributes to the superior optical absorption over the 2H-MoSe 2 . This work provides a facile strategy for enhancing the optical absorption of two-dimensional transition metal dichalcogenides (2D TMDCs) by engineering morphology and phase.
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Zhifeng He,Yuchen Jiang,Xin Cui,Zeyi Liu,Xin Meng,Jiafeng Wan,Fangwei Ma
Recently, molybdenum (Mo)-based catalysts have been proved to be effective NRR catalysts due to the high affinity of nitrogen to Mo. The design of a heterostructure and the introduction of defects, such as vacancies and heteroatom doping, are effective means to regulate the microstructure of catalysts and further improve their electrocatalytic N2 into NH3 performance. In this paper, VS-Fe-doped 1T/2H mixed-phase MoS2/C (VS means sulfur vacancies) heterostructure sphere-like nanoflowers with rich sulfur vacancies are prepared through a pectin-assisted hydrothermal reaction, followed by calcination and treatment with NaBH4 solution. VS-Fe-MoS2/C exhibits good electrocatalytic NRR performance with a high ammonia yield rate of 17.8 ± 0.7 μg h–1 mg–1 at −0.5 V versus reversible hydrogen electrode (vs RHE) and a Faraday efficiency (FE) of 9.2% at −0.3 V (vs RHE) under ambient conditions. Introducing sulfur vacancies, iron doping, and preparing 2H-phase MoS2 have greatly improved the performance of electrocatalytic nitrogen reduction to ammonia.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2021
·
IF 4.094
Yinggang Liu,Shuai Liu,Hanxiao Li,Lijun Yu,Lan Sun,Jiale Xue,Ruojun Xu,Guoxiang Chen
Transition metal dichalcogenides (TMDCs) are considered as the potential electrocatalysts for hydrogen evolution reaction (HER) owing to the two-dimensional (2D) geometry and tunable band gap. However, both the inefficient electron transferring and high Gibbs free energies for hydrogen adsorption (ΔG H *) in MoSe 2 limit its further improvement in catalytic performance. Herein, the few-layered 1T@2H–MoSe 2 composite nanosheets are synthesized by one-pot hydrothermal reaction . It is found that the morphology and composites of nanosheets could be influenced by hydrothermal reaction parameters. As compared to pure 2H–MoSe 2 , 1T@2H–MoSe 2 electrode exhibits remarkable activity for HER with a low overpotential (118 mV), small Tafel slope (65.8 mV·dec −1 ) as well as large electrochemical active area (C dl = 37.5 mF cm −2 ) in acid electrolytes. Density functional theory (DFT) calculations demonstrate that ΔG H * of 1T@2H–MoSe 2 (0.232 eV) is much lower than these of pure 1T-MoSe 2 and 2H–MoSe 2 . It could be ascribed to both the optimized charge transfer and increased density of active sites in 1T@2H–MoSe 2 nanosheets.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2023
·
IF 13.1
Fei Wu,Mengyun Ling,Lei Zhang,Qiuyu Zhang,Baoliang Zhang
Herein, we propose a combination strategy to induce robust room-temperature electromagnetic coupling in non-magnetic MoS 2 semiconductor (2H–MoS 2 ). The introduction of ascorbic acid (AA) is intended to introduce sulfur vacancies ( sv ) in the process of 2H–MoS 2 nano-sheet shells coating on the surface of three-dimensional (3D) matrix. It promotes the transformation of local lattice (2H–MoS 2 ) into metal phase (1T-MoS 2 ). The transformed 1T-MoS 2 phase improves the conductivity ( σ ) of the composite by 1.48 times. Due to the Mo 4+ 4 d energy state within the bandgap, the exchange interaction between the sv and the Mo 4+ 4 d bandgap state produces a robust intrinsic electromagnetic response of more than 1.2 emu/g. Density functional theory (DFT) calculations are used to analyze the above results, and a novel electromagnetic-coupling-enhanced microwave absorption mechanism is proposed. The results indicates that microwave absorption performance can be effectively improved by the phase-incorporation effect. The minimum reflection loss (RL min ) reaches −53.1 dB (1.7 mm) and the adjustable effective absorption bandwidth (EAB) covers 14.5 GHz (3.5–18 GHz) at the various matching thicknesses. This work might shed light on a new possibility of manipulating electromagnetic interaction to promote microwave absorption.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2019
·
IF 7.723
Xiaoyong Xu,Lou Pan,Qiutong Han,Chengzhong Wang,Peng Ding,Jing Pan,Jingguo Hu,Haibo Zeng,Yong Zhou
Molybdenum sulfide (MoS 2 ) has attracted considerable attention as one of noble-metal-free co-catalysts of hydrogen evolution reaction (HER) for artificial photosynthetic water splitting. There are well-known challenges in optimizing its catalytic activity to pursue the replacement of platinum (Pt) for HER, owing to the edge-limited active sites and intrinsically poor conductivity. Herein, we prepared metallic MoS 2 nanodots (MNDs) with 1T-phase occupation and edge-exposure maximum to achieve the simultaneous optimization of electric conductivity and active sites. When integrated as co-catalysts with graphitic carbon nitride (g-CN) for sunlight-driven HER in alkaline electrolyte, the outstanding photocatalytic activity with hydrogen evolution rate of 5.62 mmol g −1 h −1 , over 280 times higher than that of pure g-CN, demonstrates the excellent co-catalytic performance of 1T-MoS 2 NDs (1T-MNDs) that even comparable to state-of-the-art Pt. The photo-induced charge dynamics describe the role of 1T-MNDs in facilitating charge separation as well as surface catalytic reaction, suggesting a promising potential of 1T-MNDs with more active sites and higher conductivity as Pt-alternative co-catalysts for solar hydrogen production.
研究领域:
材料科学
·
能源化学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Zhe Bai,Luyao Wang,Hongwei Cao,Xiangwen Zhang,Guozhu Li
Hydrodesulfurization (HDS) is an effective way to reduce sulfur content in oil for the enforcement of more stringent environmental regulations. MoS 2 has been widely used as an effective component for catalyzing HDS, and needs to be extensively studied in depth. Herein, MoS 2 nanoflowers with the symbiosis of 1T-2H phases in the basal planes and coexistence of S and Mo vacancies are prepared via the assembly of many nanosheets by a one-pot solvothermal method. The morphology, crystal phase structure and defects of these 1T-2H MoS 2 samples were well characterized. The 1T/2H ratio and the state of vacancies were effectively tuned by changing the solvothermal conditions. Active and stable 1T-2H mixed MoS 2 nanoflowers with high content of 1T phase and moderate S and Mo vacancies were obtained by the regulation of oxalic acid in the mixture of ethanol and water. In the HDS of dibenzothiophene at 300 °C and 4 MPa, the optimal catalyst of MoS 2 -water–ethanol-OA exhibited a substrate conversion of 89.3% in 10 h. Moreover, the activity of MoS 2 -water–ethanol-OA was well retained without any decrease in the recycling experiment.
研究领域:
催化
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
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