INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Xinkuai He,Genfa Zeng,Jingjing Yang,Yiren Li,Luye Wu
The electrochemical reduction behavior in the preparation of Ni–Mo alloy catalysts using benzyl alcohol (BA) and ethylene glycol (EG) mixed solvents is studied via CV. These studies indicate that the mechanism of Ni–Mo co-deposition corresponds to a typical induced co-deposition mechanism, in which Ni 2+ can facilitate the Mo 6+ reduction while Mo 6+ can suppress the Ni 2+ reduction in the mixed solvents. SEM micrographs reveal that these Ni–Mo alloy catalysts exhibit dense structures composed of 'hillock'-shaped granules, and the size of these granules can be tuned by adjusting the Mo content. XRD pattern reveals that the Ni–Mo catalysts present a nanocrystalline structure with an average crystallite size of 48.7 nm. The experimental data demonstrate that increasing the Mo content in the Ni–Mo alloy catalyst from 5.36 to 11.62 wt% significantly enhances the HER performance. Particularly, the catalyst containing 11.62 wt% Mo demonstrates superior catalytic efficiency in 1 M KOH, requiring an overpotential of merely 58 mV to reach a current density of 10 mA cm −2 .
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高影响因子
ACS Catalysis
·
2025
·
IF 13.1
Wei An,Zeyang Liu,Tongjun Shen,Yizhang Du,Cun Huang,Boyuan Duan,Chunxia Wang,Guoyong Huang,Yiming Yan,Shengming Xu
To overcome the low current-density efficiency and long-term stability issues of industrial overall water splitting at ampere-level current density, a kind of superwetting Mo-doped nanoarray anchored on nickel foam (NF) (Mo-CoP/NC) with three-dimensional (3D) nanoflower structure is constructed. The incorporation of Mo species induces thermoneutral hydrogen adsorption free energy and creates favorable empty d-orbitals, which enhances the d–p hybridization of Co–O bonds, thereby accelerating the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) kinetics in alkaline media. The optimized Mo-CoP/NC exhibits exceptional electrocatalytic performance, requiring low overpotentials of 198 mV for HER and 384 mV for OER at a current density of 1000 mA cm–2 and achieving maintains robust operation in overall water splitting at 3000 mA cm–2. When employed as a bifunctional catalyst in an alkaline electrolyzer, a cell voltage of 1.87 V can be realized at 1000 mA cm–2 , outperforming commercial benchmarks. Density functional theory (DFT) calculations reveal that Mo doping optimizes hydrogen adsorption energy and reduces energy barriers for water dissociation. The superwetting surface ensures rapid gas bubble detachment and efficient active site regeneration, while N-doped carbon encapsulation endows long-term stability with negligible activity decay over 100 h of continuous operation.
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高影响因子
NANOTECHNOLOGY
·
2021
·Vol. 32
·期 50
·505610
·
IF 3.874
Liyun Qin,Yan Lu,Qinliang Li,Zhendong Wang,Jianyu Wang,Binbing Tang,Wenda Zhou,Cailei Yuan,Qisheng Wang,Li Wang
The combination of two-dimensional (2D) materials with non-2D materials (quantum dots, nanowires and bulk materials), i.e. mixed-dimensional van der Waals (md-vdW) heterostructures endow 2D materials with remarkable electronics properties. However, it remains a big challenge to synthesize md-vdW heterostructures because of the difference of crystal symmetry between 2D and non-2D materials. Meanwhile, it is difficult to initiate the nucleation due to the lack of chemical active sites on chemical inert surfaces of 2D materials. Herein, we design a general chemical vapor deposition method for synthesizing a broad class of md-vdW heterostructures with well-aligned hexagonal symmetry including MoS2/FeS, MoS2/CoS, MoS2/MnS, MoS2/ZnS, Mo(SxSe1–x)2/ZnSxSe1–x, Mo(SxSe1–x)2/CdSxSe1–x. Combining with DFT calculation, we find that the hexagonal symmetry and the centered clusters of MoS2 and Mo(SxSe1–x)2 nanoflakes are two crucial factors to launch the hexagonally oriented growth and nucleation of non-2D materials on 2D materials. Our discovery opens an opportunity for the versatile hetero-integration of 2D materials and allows systematic investigation of physical properties in a wide variety of md-vdW heterostructures.
研究领域:
材料科学
·
纳米技术
·
化学
·
物理学
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高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 25
·14534-14544
·
IF 12.732
Fei Shen,Zhongti Sun,Liang Zhao,Yuanhua Xia,Yanyan Shao,Jingsheng Cai,Shuo Li,Chen Lu,Xiaoling Tong,Yu Zhao,Jingyu Sun,Yuanlong Shao
Developing high energy density and high-power density electrode materials is of great importance for lithium-ion batteries to satisfy the requirements of the customer market. We report that introducing Mo into Nb2O5 at a low temperature leads to phase transition from bronze-phase T to crystallographic shear-phase H. The resulting Nb1Mo0.1O2.8 exhibits higher energy density than T-Nb2O5 and improved rate-performance and cycling-stability compared to H-Nb2O5. Neutron diffraction was applied to Nb1Mo0.1O2.8 to characterize the structure and two-phase ratios of the mixed metal oxide together with the first-principles method to calculate the possible Mo substitution sites. The Nb1Mo0.1O2.8 anode displays intrinsic pseudocapacitive lithium-ion intercalation with a high energy density of 362 mA h g−1 at 0.2C. In situ XRD results suggest that Nb1Mo0.1O2.8 is able to intercalate more lithium ions with smaller structure expansion compared with H-Nb2O5; furthermore, a computational method reveals that the introduction of Mo into the oxide increases Li atom adsorption energies and decreases the diffusion barrier. Therefore, Nb1Mo0.1O2.8 is a promising anode material for high-capacity and high-rate lithium-ion energy storage.
研究领域:
材料科学
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电化学
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能源存储
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高影响因子
Catalysis Science & Technology
·
2025
·
IF 4.2
Yu-Le Wang,Songhai Wu,Yu-Zhen Xu,Yu-Dong Shan,Yong Liu,Xu Han
The selective oxidation of cyclohexene (Cy) to cyclohexene oxide (Cy-ep) using O2 remains challenging due to low epoxidation selectivity. In this work, a series of Mo-doped TS-1 (Mo-TS-1) catalysts were successfully synthesized for the epoxidation of Cy under solvent- and initiator-free conditions with O2 as the oxidant. Among them, 5Mo-TS-1 exhibited high catalytic performance, achieving 43.5% Cy conversion and 50.6% selectivity toward Cy-ep. Additionally, valuable byproducts such as 2-cyclohexen-1-ol (Cy-ol) and 2-cyclohexen-1-one (Cy-one) were obtained with yields of 28.0% and 21.4%, respectively. Since both Cy-ol and Cy-one are valuable intermediates in fragrance synthesis, over 43.5% of Cy was effectively converted into high-value products. Quenching experiments and Raman spectroscopy revealed that surface oxygen vacancies (Ov) facilitate the activation of O2 to form ≡Ov‑superoxo species, which abstract hydrogen from the allylic C-H bond of Cy to generate 3-cyclohexenyl radicals (Cy•). These radicals subsequently react with O2 to form Cy-OO•, followed by hydrogen abstraction from another Cy molecule to yield 2-cyclohexene-1-hydroperoxide (Cy-OOH). A positive correlation between Cy-OOH and Cy-ep formation underscores the critical role of Cy-OOH in the epoxidation process. Furthermore, Raman spectroscopy confirmed the presence of ≡Mo-(η2-O2) peroxo species on the catalyst surface, which preferentially attack the C=C bond of Cy to form Cy-ep. DFT calculations elucidated two distinct O2 activation pathways: In Pathway I, O2 is activated at Ov sites to form ≡Ov‑superoxo, which subsequently reacts with Cy to generate ≡Ov‑peroxo, Cy-OOH, and Cy•. In Pathway II, Mo(V/VI) sites either directly activate O2 or react with peroxo intermediates (≡Ov‑peroxo or Cy-OOH) to form ≡Mo-(η2-O2). This species selectively epoxidizes the alkene bond in Cy to Cy-ep. Notably, the direct activation of O2 at Mo(V/VI) sites bypasses the allylic oxidation route, thereby enhancing the epoxidation selectivity beyond the theoretical limit of 50.0%. This study provides new insight on the importance of surface superoxo and peroxo mediated by Ov and Mo(V/VI) in the epoxidation processes.
研究领域:
催化化学
·
材料化学
·
绿色化学
·
多相催化
·
氧化反应
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DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Quan Chen,Lunan Wu,Xiaoli Zhao,Xiu-Jie Yang
Zn-Ti layered double oxide (LDO) nanosheets were synthesized by a simple co-precipitation-calcination process for the enhanced photocatalytic degradation of methyl orange (MO), rhodamine B (RhB) and methylene blue (MB). ZnTi-LDOs nanosheets present higher photocatalytic efficiency for MO, RhB and MB removal, which is 5.4, 4.4 and 6.7 times of that of Zn-Ti layered double hydroxide (LDH), respectively. The photocatalytic activity of synthesized ZnTi-LDOs is greatly affected by the mole ratio of Zn/Ti, calcination temperature and pH value. It is found that the formation of ZnO/ZnTiO 3 heterojunction in ZnTi-LDOs could effectively accelerate the rapid separation of charge carriers, and thus enhance the photocatalytic activity via enlarging the photoresponse range. The possible charge transfer mechanism for photocatalytic degradation of organic dyes by ZnTi-LDOs was proposed based on the active species test and UV–Vis diffuse reflectance spectra. The results of active species trapping experiments showed that ‧OH, ‧O 2 − , h + , e − all had effect on the degradation of RhB , and ‧OH played a major role. This study provides a new insight for the photocatalytic degradation of organic pollutants from wastewater by ZnTi-LDOs.
研究领域:
材料科学
·
环境科学
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Peng Du,Kailong Hu,Juan Lyu,Huanglong Li,Xi Lin,Guoqiang Xie,Xingjun Liu,Yoshikazu Ito,Hua-Jun Qiu
Materials co-design of the single-atom catalytic centers and the supports can push the limits of the emerging wearable metal-air batteries. The metal single-atom catalysts are required to be bifunctional with high efficient electrocatalytic activities for both oxygen reduction and evolution reactions (ORR and OER), and preferably non-noble. The supports, on the other hand, in addition to the requirements of being free-standing, flexible and porous, are required to strongly interact with the metal species to prevent their aggregation. However, satisfying these requirements simultaneously is yet challenging. Here, a free-standing 3D nanoporous holey graphene with both N and single-atom Mo dopants is prepared. The nanoholes are created by chemical vapor deposition method on nanoporous NiMo alloy templates with their surface decorated with catalytically inert SiO 2 nanoparticles . The edge-rich graphene induced by the nanoholes facilitates the doping of pyridinic N and single-atom Mo in the fringe near the edges. The resulting N and Mo co-doped nanoporous holey graphene exhibits high bifunctional ORR and OER catalytic activities in alkaline electrolytes. The synergetic effects between N and Mo dopants are also revealed by density functional theory calculations. When incorporated in a solid-state zinc-air battery, the battery is bendable and can be continuously discharged/charged for 88 h with a high power density of 83 mW cm −2 . This work provides an efficient route to design metal single atom/cluster doped 3D freestanding nanoporous graphene as flexible electrodes.
研究领域:
材料科学
·
能源存储与转换
·
电化学
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2026
·
IF 21.1
Jie Sun,Nan Zhao,Jianjiao Xin,Miao Yu,Chunmei Lv,Yanqing Jiao,Xiuwen Wang
Rational designing a robust bifunctional electrocatalyst for urea-assisted water splitting (UWS) toward a carbon-neutral economy is imperative factor to address the energy-intensive challenges of sustainable hydrogen production at industrial current densities. In this study, a Mo/P co-doped Ni 3 S 2 one-dimensional nanoarray, decorated with two-dimensional nanosheets (MP-Ni 3 S 2 ), is synthesized using an in-situ growth method. The optimized MP-Ni 3 S 2 exhibits a significant advantage in the urea oxidation reaction (UOR), achieving much lower potentials (1.346 V at 100 mA cm −2 and 1.505 V at 1000 mA cm −2 in 1.0 M + 0.33 M urea) comparable to the oxygen evolution reaction (OER), which requires 302 mV and 445 mV at the same current densities. The MP-Ni 3 S 2 ||MP-Ni 3 S 2 electrolyzer reduces the cell voltage from 2.146 V for overall water splitting (OWS) to 1.856 V for UWS at 500 mA cm −2 , surpassing most reported catalysts. Theocratical calculations demonstrate that Mo and P doping in Ni 3 S 2 , through the hybridization of Mo/Ni 3d and N/O 2p orbitals, effectively accelerates UOR kinetics by lowering the energy barrier in dehydrogenation and N-N coupling processes, while P doping optimizes the Gibbs free energy of hydrogen adsorption (ΔG H* ) to enhance HER activity, thereby synergistically improving overall performance. These findings offer a viable strategy for the development of energy-saving hydrogen production.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Guanghui Li,Changye Mang,Lang Xing,Pengxu Cao,Yongfeng Cai,Jun Luo,Hao Jiang
Methylene blue (MB) is extensively used in the textile industry; meanwhile, it is also one of carcinogenic and mutagenic pollutants. The removal of MB from wastewater by photocatalytic decomposition under visible light irradiation is a very important method. In this work, a photocatalyst of Mo-doped TiO 2 coated on fly ash cenosphere (CTAB-Mo-TiO 2 /FAC) was prepared by a sol-gel method and modified by hexadecyl trimethyl ammonium bromide (CTAB). Compared to TiO 2 /FAC and Mo-TiO 2 /FAC (without CTAB), it was featured by low bandgap and strong light absorption ability. More importantly, the light absorption range broadened from 200 to 400 nm to 200–800 nm, which could absorb visible light . Besides, after adding CTAB, the Mo 6+ could more easily dope into the TiO 2 lattice and cause crystal distortion, which exposed more oxygen vacancies . Oxygen vacancies could generate abundant reactive radicals to enhance the photocatalytic activity . At CTAB-Mo-TiO 2 /FAC dosage of 2 g/L, 99.75% of MB was removed in an initial MB concentration of 0.03 mmol/L with a pH of 7.0 under visible light irradiation of 60 min, whereas that of Mo-TiO 2 /FAC and TiO 2 /FAC was only 42 % and 24 %, respectively. The photodynamic parameter of CTAB-Mo-TiO 2 /FAC (0.066 min −1 ) is about 3 times of Mo-TiO 2 /FAC (0.023 min −1 ), 8.3 times of TiO 2 /FAC (0.008 min −1 ).
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
DALTON TRANSACTIONS
·
2017
·Vol. 46
·期 20
·6776-6784
·
IF 4.029
G. Q. Wang,X. H. Gong,Y. J. Chen,J. H. Huang,Y. F. Lin,Z. D. Luo,Y. D. Huang
Two novel red phosphors KBaEu(XO4)3 (X = Mo, W) have been synthesized by high-temperature solid-state reactions and the crystal structures were determined for the first time. Single-crystal X-ray diffraction data reveal that their space groups are C2/c. The crystalline structure is constituted of K/BaO8 distorted square antiprisms and distorted EuO8 polyhedra which form chains lying along the c-axis and two kinds of distorted XO4 tetrahedra. This high disorder of K/Ba which might lower the crystal field symmetry around Eu3+ results in the high purity of red emission around 615 nm originating from 5D0 → 7F2 transition under near-ultraviolet (NUV) excitation. With increasing temperature, the luminescence of KBaEu(XO4)3 (X = Mo, W) phosphors decreases almost linearly with subtle alteration for the CIE coordinate. As the temperature reaches 550 K, the red emission intensity decreases to 37.3% and 50.7% of that at 300 K for KBaEu(MoO4)3 and KBaEu(WO4)3, respectively. The analysis of the decay curves of the 5D0 → 7F2 emission at variable temperatures indicates the weak cross relaxation and non-radiative energy transfer between Eu3+ ions. These results demonstrate that the investigated phosphors are attractive for application in high power NUV excited white LEDs.
研究领域:
材料科学
·
发光材料
·
固态化学
·
光学材料
·
LED技术
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DOI
高影响因子
ACS Applied Energy Materials
·
2024
·
IF 5.4
Dayakar Gandla,Yun’an Zhou,Yihao Yan,Yifan Niu,Fuming Zhang,Daniel Q. Tan
MXenes, a class of two-dimensional transition metal carbides and nitrides, hold great promise for electrochemical energy storage applications due to their exceptional electronic conductivity, tunable surface chemistry, and pseudocapacitive charge storage mechanisms. This study introduces a one-step approach to deposit Mo and Ti-dual oxide nanoparticles in situ onto Mo2Ti2C3Tx MXene using the Lewis acid molten salt method (LAMS), meticulously optimizing annealing conditions. The incorporation of Mo and Ti dual oxide nanoparticles improves the pristine Mo2Ti2C3Tx MXene by preventing collapse of the layered structure and restacking of MXene sheets. Both three-electrode and coin cell devices are assessed in an aqueous electrolyte, illustrating the favorable role of the nanoparticles acting as spacers. Remarkable outcomes include a specific capacity of 434 C g–1 at 5 mA cm–2, exceptional capacity retention of 94% after 5000 charge–discharge cycles at 50 mA cm–2, and a high gravimetric energy density of 52.5 W h kg–1 at a power density of 1442 W kg–1 in an aqueous 3 M KOH electrolyte. This research underscores the potential of double transition metal MXenes as energy storage electrodes and an eco-friendly mass synthesis route, contributing to sustainable advancements in energy storage technology.
研究领域:
材料科学
·
能源存储技术
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Gaili Ke,Feng Duan,Binyao Liu,Xiaotian Liu,Jinyu Wen,Bi Jia,Xiaoyan Liu,Huichao He,Yong Zhou
In theory, suitable metal ions doping into the surface of BiVO 4 photoanodes could improve its water oxidation performance effectively. But the common homogeneous reaction strategy is not well applicable for the preparation of BiVO 4 film photoanodes with metal ions surface doping. Herein, a photoelectrochemical treating approach was reported to prepare BiVO 4 films with W or Mo surface doping in saturated tungstate and molybdate-containing electrolyte, respectively. The doping of W or Mo into the surface of BiVO 4 film was attributed to the following reactions. Firstly, the photocorrosion of BiVO 4 film photoelectrodes resulted in the dissolution of VO 4 3+ from BiVO 4 lattice under AM 1.5 G illumination. Then, the WO 4 2+ or MoO 4 2+ in the saturated electrolyte entered and occupied the dissolved sites of VO 4 3+ on BiVO 4 surface through ions exchange reaction . Due to the lower radiative recombination of carrier as well as higher electrocatalytic water oxidation activity, the resultant W or Mo doped BiVO 4 films as photoanodes showed better solar water oxidation activity, kinetics and stability, although their light harvesting property and morphological feature were close to the pristine BiVO 4 film photoanode. The present work provides a new and effective approach for the achievement of metal ions doping into the surface of BiVO 4 photoanodes, which could inspire the preparation of similar photoanode materials.
研究领域:
材料科学
·
能源科学
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DOI
高影响因子
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