FUEL
·
2022
·
IF 8.035
Zijia Liu,Yingnan Zhang,Jiabao Bai,Huawei Yang,Lixia Yang,Liangjiu Bai,Donglei Wei,Wenxiang Wang,Ying Liang,Hou Chen
Aerobic oxidative desulfurization (AODS) represents an economical and sustainable way for desulfurization of petroleum fractions, which calls for high-performance catalysts to convert thiophene sulfides into sulfones under mild temperatures. In this work, we report that MoO x nanoclusters decorated on spinel-type porous metal oxide nanosheets can be utilized as an efficient and durable catalyst for the AODS reactions. We show that the electronic structure of the MoO x nanoclusters can be effectively modulated by the metal oxide carriers, and thereby identify the Mo(V) species to be the active center in this reaction. The optimal process with MoO x /CuCo 2 O 4 as the catalyst, air under atmospheric pressure as an oxidant source could drive the aerobic transformation of dibenzothiophene at 90 °C with a turnover frequency of 16.2 h −1 . Moreover, no catalytic performance attenuation and chemical structure deformation are observed in the six successive reuses. This work provides both fundamental and practical insights into the development of highly active and stable nanocluster catalysts.
研究领域:
化学工程
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材料科学
·
催化反应
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Qi Wang,Xingyong Li,Jinyi Duan,Jinlei Chen,Yueyuan Ye,Dechao Wang,Shuirong Li,Zhifeng Zheng
Red mud supported Ni (Ni/RM) catalysts have been explored to the hydrodeoxygenation (HDO) of palmitic acid, however, the decarbonylation (DCO)/decarboxylation (DCO 2 ) is dominant. Therefore, the modification the oxophilic nature of catalysts can significantly impact their path of HDO and selectivity to aim products. Herein, MoO x -decorated Ni-Mo/RM catalysts with a hierarchical flower-like micro/nanostructure were prepared and applied in the HDO of palmitic acid. The effect of MoO x addition was investigated to control the path of HDO, resulting in the changing of carbon number distribution of the product. Combined with several comprehensive structural characterizations and catalytic HDO test, it is shown that the surface defective MoO x species and FeO x species near the metallic sites could significantly facilitate the C-O bond weakening, generated more direct deoxygenation product (hexadecane). Whereas the excessive Mo loading leads to clear altering of surface chemistry (i.e., decrease of specific surface area, pore volume and Mo 0 species, increase of reduction temperature and CO 2 adsorption, uneven dispersion, and agglomeration of Ni species), resulting in the decrease of palmitic acid conversion. As the main oxide in RM, Fe 2 O 3 , Al 2 O 3 and SiO 2 were used as supports to load Ni-Mo bimetals respectively to explore the contribution of different components in RM to the distribution of hydrodeoxygenation products of palmitic acid.
研究领域:
催化化学
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材料科学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Liangyu Tong,Chenyu Song,Yunpeng Liu,Ruimin Xing,Karthi Sekar,Shanhu Liu
Hierarchical hybrid heterostructures are regarded to be promising materials for highly efficient bifunctional electrocatalysts and high-performance supercapacitors due to their intriguing morphological features and remarkable electrochemical properties . Herein, we demonstrate the rational construct of cost-effective MoO x @NiS 2 hybrid nanostructures as bifunctional electrocatalysts and the electrode material of supercapacitor . Microstructural analysis shows that the hybrid is a kind of hierarchical heterostructure composed of open and porous NiS 2 nanowrinkles in situ grown on non-stoichiometric MoO x nanorods , which greatly improves the conductivity, and effectively maximized the electrochemical surface area. As expected, the MoO x @NiS 2 hybrid show remarkable electrocatalytic performance in alkaline media , such as overpotentials of 101 mV at 10 mA cm −2 for hydrogen evolution reaction (HER) and 278 mV at 20 mA cm −2 for oxygen evolution reaction (OER), and a low cell voltage of 1.62 V to deliver a current density of 10 mA cm −2 . Moreover, the hybrid nanostructures present a high specific capacitance 1050 A/g at 1 A/g with ultra-long stability in 6 M KOH. The strategy proposed here introduces a new perspective about the development of efficient earth-abundant bifunctional elecrocatalysts and electrode materials for superior energy conversion and storage devices.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2021
·
IF 6.609
Xincheng Cao,Feng Long,Qiaolong Zhai,Jiaping Zhao,Junming Xu,Jianchun Jiang
To develop an efficient Ni-based catalyst for converting renewable fatty acids into high value-added fatty alcohols under mild reaction conditions, the scope of metal oxide modified nickel catalysts was scrutinized. The results show that MoO x modified Ni/CeO 2 catalyst exhibits the excellent catalytic performance in the conversion of fatty acids to form corresponding alcohols at mild reaction conditions (235 °C, 3.0 MPa H 2 ). Using stearic acid as a model substrate, Ni-MoO x /CeO 2 catalyst shows the 98.0% conversion and 96.2% selectivity to stearyl alcohol, which is significantly higher than that of Ni/CeO 2 catalyst and of a physical mixture of both Ni/CeO 2 and MoO x /CeO 2 . Detailed characterization (XRD, Raman, XPS, in situ CO-FTIR, HRTEM, and EPR) indicates that NiMoO 4 is the mainly active phase in the pre-reduced bimetallic catalysts. After reduction at 500 °C in a H 2 flow, the surface of Ni metal is decorated by the MoO x species, the phenomenon is similar to the strong metal-support interaction (SMSI) previously observed on reducible oxides. The presence of MoO x species in the bimetallic Ni-MoO x /CeO 2 catalyst not only improves the dispersion of metallic Ni, but also promotes the charge transfer from Ni to Mo. The electronic interaction at the interface of Ni and MoO x provides synergistic catalysis sites of electron-deficient Ni and MoO x species, which is primarily responsible for the excellent catalytic performance of the bimetallic Ni-MoO x catalyst. Additionally, the introduction of Mo species provides much oxygen vacancy sites for the adsorption of fatty acids, which results in high activity for the conversion of fatty acids. The insights into the synergistic catalysis between Ni and MoO x will provide new possibilities in the design of efficient Ni-based catalysts for selective hydrogenation of other biomass-derived compounds containing carboxylic group.
研究领域:
催化化学
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可再生资源转化
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材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Zheng Lian,Ting Wu,Xining Zhang,Shuangfei Cai,Youlin Xiong,Rong Yang
Advanced oxidation processes (AOPs) based on photocatalysis and peroxymonosulfate (PMS) activation have shown potential in antibiotics degradation by generating series of reactive oxygen species (ROS). However, construction of AOP materials with easy preparation and high reusability is still a challenge. Herein, we prepared a Mo 2 C/MoO x thin film through one-step chemical vapor deposition (CVD), and this film could synergistically promote PMS activation and visible-light photocatalysis due to the redox cycles of multiple Mo valence states and staggered bandgap structures of Mo-based components in the film. The generated oxygen species (mainly 1 O 2 radical, accompanying by other ones involving OH, SO 4 − and O 2 − radicals) could efficiently degrade the uneasily degradable antibiotics, tetracycline (TC), with a removal efficiency of 91.7 % within 60 min. Meanwhile, the film could maintain the TC degradation capability for at least 10 cycles, exhibiting promising reusability. The work could provide feasible approaches to develop easily prepared AOP thin film materials for antibiotic pollutant degradation.
研究领域:
环境科学
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化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Jiahuan He,Zhendong Yao,Xuezhang Xiao,Wenzheng Chen,Ziwei Huang,Xiulin Fan,Zhong Dong,Xu Huang,Xuancheng Wang,Man Chen,Lixin Chen
The hydrolysis of AB has been regarded as a kind of secure and efficient method for hydrogen generation. However, the development of economical and stable catalysts with high catalytic activities remains a bottleneck for realizing further industrial application of AB. Herein, high-loading heterostructured Ni/NiO nanoparticles with different Ni/NiO weight ratios anchored on one-dimensional porous MoOx nanorods (denoted as Ni/NiO@MoOx) have been synthesized and introduced into the hydrolysis of AB for the first time. The Ni/NiO@MoOx-50H catalyst (synthesized under the reduction atmosphere of 50% H2/50% Ar) with an optimal Ni/NiO weight ratio (73.96/26.04) exhibits an excellent catalytic activity for the hydrolysis of AB with the turnover frequency (TOF) value reaching 86.29 molH2 molNi–1 min–1 at 298 K, which is one of the highest TOF values among the reported non-noble metal catalysts. In addition, on account of high Ni loading weight (29.15 wt %), the hydrogen generation rate of Ni/NiO@MoOx-50H achieves 10,478 mL·min–1 g–1 (35,947 mL·min–1 gNi–1), overtaking most values both in noble and non-noble metal catalysts for the hydrolysis of AB. The bridging effect of NiO steadily connects the Ni and MoOx carrier and promotes great durability of Ni/NiO@MoOx-50H, of which the catalytic activity exhibits not significant degradation in the fifth cycle. The catalysis originated from the metal/metal oxide (Ni/NiO@MoOx) provides a novel insight into the catalyst design, preparation, and application for chemical hydrogen storage systems.
研究领域:
材料科学
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催化
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氢存储
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 15
·8862-8877
·
IF 4.036
Yifan Wang,Huiqin Yao,Yan Zu,Wenyan Yin
Wounds infected with drug-resistant bacteria are hard to treat, which remains a serious problem in clinical practice. An innovative strategy for treating wound infections is thus imperative. Herein, we describe the construction of a nanocomposite from biocompatible poly(vinyl alcohol) (PVA)/polyethylene glycol (PEG) hydrogel loaded biodegradable MoOx nanoparticles (NPs) and photosensitizer methylene blue (MB), denoted as MoOx@MB-hy. By incorporating MoOx@MB NPs, the nanocomposite hydrogel can act as a photoactivated wound dressing for near-infrared-II 1064 nm and 660 nm laser synergetic photothermal–photodynamic therapy (PTT–PDT). The key to PTT-induced heat becomes the most controllable release of MB from MoOx@MB-hy to produce more 1O2 under 660 nm irradiation. Importantly, MoOx@MB-hy can consume glutathione (GSH) and trap bacteria nearer to the distance limit of ROS damage to achieve a self-migration-enhanced accumulation of reactive oxygen species (ROS), thereby conquering the intrinsic shortcomings of short diffusion distance and lifetime of ROS. Consequently, MoOx@MB-hy has high antibacterial efficiencies of 99.28% and 99.16% against Ampr E. coli and B. subtilis within 15 min. Moreover, the light-activated strategy can rapidly promote healing in wounds infected by drug-resistant bacteria. This work paves a way to design a novel nanocomposite hydrogel dressing for safe and highly-efficient antibacterial therapy.
研究领域:
材料科学
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纳米技术
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生物医学工程
·
药学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CATALYSIS
·
2023
·
IF 7.3
Suting Xie,Xinyu Zhao,Jiabao Bai,Zhihua Yang,Hou Chen,Lixia Yang,Ying Liang,Liangjiu Bai,Huawei Yang
Aerobic oxidative desulfurization (AODS) offers a sustainable and cost-effective alternative to conventional diesel desulfurization techniques. However, despite its potential, the development of catalysts with both high activity and stability remains a critical challenge in this field. Here we present the synthesis of polyoxometalate (POM) derived Co,N-codoped MoO x nanoclusters on graphene sheets for boosting the AODS reactions, which combines the characteristics of sub-nanometer size of POMs and excellent stability of metal oxides. Through experimental characterizations and density functional theory (DFT) calculations, we demonstrate that the MoO x nanoclusters can effectively activate O 2 by electron transfer, while the doped Co and N elements further optimize the electronic structure of Mo sites, resulting in a significant enhancement in catalytic activity. The optimized catalyst exhibits an impressive turnover frequency of 67.88 h −1 in the oxidation of dibenzothiophene (DBT), facilitating the rapid conversion of various thiophenes under mild conditions. The catalyst also demonstrates prominent durability in seven cycles of reuse with consistent catalytic performance and unchanged chemical structure. More importantly, the catalyst achieves deep AODS of real diesel, showcasing its potential for practical applications.
研究领域:
催化
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材料科学
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环境化学
·
能源
✓ 已验证
产品关联
DOI
高影响因子
Materials Futures
·
2025
·Vol. 4
·期 4
·045103
·
IF 10.8
Rui Zhang,Bobo Ma,Yuqi Cui,Chengyu Tan,Bingbing Chen,Yiming Li,Jiangjian Shi,Huijue Wu,Yanhong Luo,Dongmei Li,Jianhui Chen,Qingbo Meng
CsPbI3 perovskites with suitable bandgaps ∼1.70 eV present distinct advantages for top-cell photovoltaic materials in tandem solar cells, however, relevant work has been rarely reported. This work designed a sandwich-like MoOX/Ag/MoOX (MAM) buffer layer as the front cell window layer to maximize incident light utilization efficiency for semi-transparent CsPbI3 solar cells and four terminal (4-T) stacked cells. Further investigation revealed that the MAM has to experience in-situ reaction between Ag metal and fresh MoOX, which can simultaneously ensure the transparency of the buffer layer and improve the carrier transportation and collection, except for protecting the underlying spiro-OMeTAD layer from the bombardment of magnetron sputtering. Thanks to this MAM buffer layer and a tunnel oxide passivating contact (TOPCon) bottom cell with edge passivation, semi-transparent CsPbI3 devices (aperture area: 0.50 cm2) demonstrated a power conversion efficiency (PCE) of 18.86% while corresponding 4-T CsPbI3/TOPCon tandem solar cells (PSTSCs) presented the PCE of 26.55%. Besides, we also fabricated semi-transparent CsPbI3 minimodules with 16.67% PCE and 4-T PSTSCs with 26.41% PCE (aperture area: 6.62 cm2). This work provided a new scalable strategy for transparent buffer layers by constructing in-situ generated sandwich structured buffer layer, which is suitable for perovskite tandem solar cells.
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2024
·
IF 9.5
Chen Jieshuangyang,Lei Jie,Zhou Jinwei,Chen Xuanfeng,Deng Rongyu,Qian Mingzhi,Chen Ya,Wu Feixiang
The development of electrocatalysts with high catalytic activity is conducive to enhancing polysulfides adsorption and reducing activation energy of polysulfides conversion, which can effectively reduce polysulfide shuttling in Li-S batteries. Herein, a novel catalyst NiCo-MoO x /rGO (rGO = reduced graphene oxides) with ultra-nanometer scale and high dispersity is derived from the Anderson-type polyoxometalate precursors, which are electrostatically assembled on the multilayer rGO. The catalyst material possesses dual active sites, in which Ni-doped MoO x exhibits strong polysulfide anchoring ability, while Co-doped MoO x facilitates the polysulfides conversion reaction kinetics, thus breaking the Sabatier effect in the conventional electrocatalytic process. In addition, the prepared NiCo-MoO x /rGO modified PP separator (NiCo-MoO x /rGO@PP) can serve as a physical barrier to further inhibit the polysulfide shuttling effect and realize the rapid Li + migration. The results demonstrate that Li-S coin cell with NiCo-MoO x /rGO@PP separator shows excellent cycling performance with the discharge capacity of 680 mAh·g −1 after 600 cycles at 1 C and the capacity fading of 0.064% per cycle. The rate performance is also impressive with the remained capacity of 640 mAh·g −1 after 200 cycles even at 4 C. When the sulfur loading is 4.0 mg·cm −2 and electrolyte volume/sulfur mass ratio (E/S) ratio is 6.0 μL·mg −1 , a specific capacity of 830 mAh·g −1 is achieved after 200 cycles with a capacity decay of 0.049% per cycle. More importantly, the cell with NiCo-MoO x /rGO@PP separator exhibits cycling performance under wide operating temperature with the reversible capacities of 518, 715, and 915 mAh·g −1 after 100 cycles at −20, 0, and 60 °C, respectively. This study provides a new design approach of highly efficient catalysts for sulfur conversion reaction in Li-S batteries.
研究领域:
材料科学
·
电化学
·
储能技术
✓ 已验证
DOI
高影响因子
ADVANCED ENGINEERING MATERIALS
·
2024
·Vol. 26
·期 15
·2301724
·
IF 3.4
Ling Zhou,Zhixi Guan,Lin Yang,Daying Guo,Lianhui Wu,Xi'an Chen,Shun Wang
Herein, amorphous molybdenum oxide films are constructed by thermal atomic layer deposition (T-ALD) and plasma-enhanced atomic layer deposition (PE-ALD). The physical and chemical properties of molybdenum oxide films prepared by the two methods are systematically compared by means of film growth law, atomic force microscope, scanning electron microscope, etc. The results show that the amorphous molybdenum oxide physical phase prepared by both ALD methods is MoO 3 . Compared with T-ALD MoO 3 , the growth rate of MoO 3 thin films prepared by PE-ALD is higher. Compared to PE-ALD MoO 3 , the MoO 3 films prepared by T-ALD did not have nucleation delayed to a laminar growth mode, resulting in smoother deposited films and contained less impurity carbon. The MoO 3 prepared by PE-ALD contains 7.4% impurity carbon. This carbon-doped film significantly improves the conductivity of the MoO 3 film and shows good electrochemical activity. As expected, the MoO 3 films prepared by PE-ALD show good electrocatalytic oxygen evolution reaction. The overpotential is only 259 mV at 10 mA cm −2 and continues to evolution oxygen for 60 h with almost no attenuation, indicating that carbon doping significantly improves the catalytic intrinsic activity and stability of MoO 3 .
研究领域:
材料科学
·
化学工程
·
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
Jintao Wang,Yue Hao,Xiaojing Dong,Ming Yang,Bo Xu,Cuncheng Li
As ever-increasing global energy demands intersect with heightened environmental awareness, next-generation sustainable power generation methods have become a focal point of extensive research. Hydrogen fuel has emerged as a promising carbon-neutral energy carrier, with water electrolysis-based hydrogen synthesis drawing particular interest owing to its environmental benignity and zero-emission operation. Nevertheless, the inherent thermodynamic limitations and sluggish kinetics of the anode's oxygen evolution process (OER) present substantial energy efficiency barriers that require innovative electrocatalyst solutions. Ruthenium-based catalysts are highly favored for their high activity and low cost, yet their tendency to aggregate during synthesis compromises catalytic performance. This study presents a method for preparing RuO 2 /MoO x heterostructure catalysts, where precise control of molybdenum oxidation states through thermal modulation significantly enhances OER catalytic activity and stability. In alkaline media, the RuO 2 /MoO x catalyst achieves a low overpotential of 212 mV and exhibits a Tafel slope of 70.8 mV·dec −1 . Furthermore, the 72-h stability test in alkaline solution confirms the material's exceptional durability. Additionally, the catalyst demonstrates superior performance in urea oxidation (UOR) and ammonia oxidation reactions. This work provides a scalable strategy for developing high-performance and stable RuO 2 /MoO x based electrocatalysts.
✓ 已验证
产品关联
DOI
高影响因子
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