ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Xueqian Ji,Yuxing Xu,Hailan Feng,Pengfei Wang,Yuncheng Zhou,Jiechen Song,Qing Xia,Qiangqiang Tan
To improve the initial Coulombic efficiency, cycling stability, and rate performance of the Li-rich Mn-based Li1.2Mn0.54Ni0.13Co0.13O2 cathode, the combination of LiMn1.4Ni0.5Mo0.1O4 coating with Mo doping has been successfully carried out by the sol–gel method and subsequent dip-dry process. This strategy buffers the electrodes from the corrosion of electrolyte and enhances the lattice parameter, which could inhibit the oxygen release and maintain the structural stability, thus improving the cycle stability and rate capability. After LiMn1.4Ni0.5Mo0.1O4 modification, the initial discharge capacity reaches 272.4 mAh g–1 with a corresponding initial Coulombic efficiency (ICE) of 84.2% at 0.1C (1C = 250 mAh g–1), far higher than those (221.5 mAh g–1 and 68.9%) of the pristine sample. Besides, the capacity retention of the coated sample is enhanced by up to 66.8% after 200 cycles at 0.1C. Especially, the rate capability of the coated sample is 95.2 mAh g–1 at 5C. XRD, SEM, TEM, XPS, and Raman spectroscopy are adopted to characterize the morphologies and structures of the samples. This coating strategy has been demonstrated to be an effective approach to construct high-performance energy storage devices.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
PubMed
高影响因子
APPLIED CLAY SCIENCE
·
2021
·
IF 5.467
Lei Wang,Haris Muhammad,Minwang Laipan,Xiaohu Fan,Junkang Guo,Yongtao Li
The demand for clean water and soil drives high efficiency, less expensive, and eco-friendly clay-composites as adsorbents for remediation of heavy metals polluted environment. We have developed a new water remediation technique by using an organic-inorganic composite, L-cysteine doped polypyrrole modified bentonite (L-cys/PPy/BT) for removal of Cr(VI) and Mo(VI). The L-cys/PPy/BT showed maximum adsorption capacities of 318.5 and 65.4 mg/g for Cr(VI) and Mo(VI) respectively. For Cr(VI) and Mo(VI) the sorption process on L-cys/PPy/BT followed the Freundlich and Langmuir isotherm models, respectively. Furthermore, the pseudo-second-order kinetic model described the adsorption behavior of Cr(VI) and Mo(VI). Moreover, the thermodynamic parameters indicated that sorption processes were endothermic and spontaneous. Mechanistic assessment revealed that adsorption of Mo(VI) on L-cys/PPy/BT could be attributed to chelation, electrostatic attraction and ion-exchange of Mo(VI) with the imine/amine functional groups in the material's matrix , while electrostatic attraction, ion exchange, chelation and redox reaction played a significant role in the removal of Cr(VI). This research provides a new approach for the use of clay materials as potential sorbents for removal of heavy metal ions in contaminated water .
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Jieying Wan,Hao Zhang,Ji Yang,Jiageng Zheng,Zhongkang Han,Wentao Yuan,Bingru Lan,Xiaodong Li
Electrochemical nitrate to ammonia conversion provides an eco-friendly route for a highly valued product. However, nitrite intermediate formation and hydrogen evolution competition hinder full conversion. Here, we implement a Fe-Mo dual single-atom catalyst where the two metals work in tandem to achieve nitrate to ammonia conversion with excellent activity and stability, an ammonia yield rate of up to 13.56 mg cm −2 h −1 and a Faradaic efficiency up to 94%. In-situ Raman and Fourier-transform infrared spectroscopy confirms nitrite as the intermediate bound to metal sites. Time-dependent detection of products and DFT calculations support a tandem mechanism: the Mo single atoms are the preferred sites for the conversion of nitrate to nitrite, while the Fe single atoms catalyze the further conversion of nitrite to ammonia. This discovery paves the way for energy-relevant transformations using bimetallic single-atom catalysts.
研究领域:
催化
·
电化学
·
材料科学
·
可持续化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Haoran Yu,Shuo Liu,Ali Yaraş,Linchao Hu,Wenyi Zhang,Mingguo Peng,Hasan Arslanoğlu,Qingqing Huang,Bolormaa Oyuntsetseg,Bingying Gao,Linqiang Mao
Spent hydrodesulfurization (HDS) catalyst contains considerable amounts of Mo, Ni and V, is an important secondary resource for these valuable metals. Direct acid solution leaching method exhibits poor separation effect from catalyst carrier for Mo due to greater stability of MoS 2 . This study explored Mo leaching efficiencies from spent HDS catalyst by Fenton-like oxidation systems (H 2 O 2 and K 2 S 2 O 8 ), which were frequently employed in the wastewater treatment. To further improve Mo leaching efficiency, nano zero-valent iron (nZVFe) was used to activate H 2 O 2 /K 2 S 2 O 8 and produce more free radicals (·OH and ·SO 4 - ). Approximate 96.0 % and 93.3 % of Mo were leached from spent HDS catalyst in nZVFe + H 2 O 2 + H 2 SO 4 and nZVFe + K 2 S 2 O 8 + H 2 SO 4 systems under optimal experimental conditions, increased by 16.2 % and 8.2 % than normal H 2 O 2 (79.8 %) and K 2 S 2 O 8 (85.1 %) system without nZVFe. The leaching process of Mo in both nZVFe + H 2 O 2 + H 2 SO 4 and nZVFe + K 2 S 2 O 8 + H 2 SO 4 systems conformed to the shrinkage core model. Kinetic analysis and molecular calculation demonstrated the leaching process of Mo in nZVFe + H 2 O 2 + H 2 SO 4 system was driven by chemical reaction and solid film diffusion, and the leaching and oxidation reactions of MoS 2 occurred simultaneously. However, the leaching process of Mo in nZVFe + K 2 S 2 O 8 + H 2 SO 4 system was driven only by chemical reaction, solid MoS 2 was firstly dissolved into Mo 4+ by H + , and then oxidized into Mo 6+ by ·SO 4 - . The economic and environmental impacts evaluation indicated that the separation of Mo from spent HDS catalysts by nZVFe + H 2 O 2 + H 2 SO 4 was assigned as a better choice than normal H 2 O 2 and K 2 S 2 O 8 system without nZVFe due to higher leaching efficiency and lower cost.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2019
·Vol. 25
·期 37
·8813-8819
·
IF 5.16
Jiao Zhang,Lin Zhou,Qujiang Sun,Hai Ming,Lianshan Sun,Chunli Wang,Yingqiang Wu,Kai Guan,Limin Wang,Jun Ming
Graphical Metal–organic assemblies for electrodes : A new metal–organic coordination strategy tuned by a surfactant is presented for the design of Mo-based hybrid materials ranging from 2D nanopetals to 3D microflowers. The new lithium-ion battery (LIB) of Ni-MoO 2 /N-C|LiNi 0.6 Co 0.2 Mn 0.2 O 2 with high rate features above 8 C is introduced. This strategy is applicable for greater capabilities, and the high-rate LIB can meet the requirements of fast-charging energy storage devices. Multi-dimensional metal oxides have attracted great attention in diverse applications due to their intriguing performances. However, their structural design remains challenging, particularly that based on organic chelation chemistry. Although metal–organic complexes with different architectures have been reported, their structure formation mechanisms are not well understood because of the complex chelation processes. Herein, we introduce a new metal–organic coordination strategy to construct metal-decorated (Ni, Co, Mn) Mo-based complexes ranging from 2D nanopetals to 3D microflowers. The chelating process of the metal–organic complex can be tuned by a surfactant, giving rise to different structures, and then a further metal can be appended. Thus, different metal (oxide)-decorated MoO 2 /C-N structures were designed, enabling an extremely high lithium storage capability of 1018 mA h g −1 and rate capacities of up to 10 A g −1 over 1000 cycles. Relationships between electrochemical behavior and structure have been analyzed kinetically. A high-rate lithium-ion battery has been assembled from Ni-MoO 2 /C-N and an Ni-rich layered oxide as the anode and cathode, respectively. We believe that this general metal–organic coordination strategy should be applicable to other multi-functional materials with superior capabilities.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 51
·38002-38008
·
IF 3.9
Xin Li,Mohan Zu,Linzhuo Yan,Qiang Zhao,Liu Liu
A novel Mo–Fe bimetallic metal–organic framework [Fe2(4,4′-bipy)Mo2O8]·2H2O (1) was synthesized and characterized by X-ray single crystal diffraction, infrared spectroscopy (IR), thermogravimetric analysis (TGA), ultraviolet-visible spectroscopy (UV-vis), and its magnetic properties were studied. The compound demonstrates insolubility in most solvents and exhibits significant chemical stability across a wide pH range. Typically, exceptional selectivity and efficient conversion of sulfides to sulfoxides using 1 with H2O2 have been verified under ambient conditions.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Feiyu Gao,Chaowen Tan,Yang You,Yong Hou,Hongyan Yan,Xuewei Lv,Jie Dang
The imperative need for efficient and selective adsorption of Ni(II) and Mo(VI) is crucial for resource utilization and environmental protection. However, this process faces a challenge due to the scarcity of adsorbents that can adeptly adsorb both metal ions simultaneously. To address this, this study introduces a novel composite adsorbent material, denoted as BECZN, achieved through composite cross-linking of waste orange peel biochar with in situ aminated cobalt/zinc-zeolitic imidazolate frameworks (Co/Zn-ZIF-NH 2 ). The incorporation of Co/Zn-ZIF-NH 2 enhances the availability of active groups within BECZN. The aerogel structure of BECZN prevents ZIF material collapse and agglomeration, thereby improving active site exposure. BECZN exhibits notable adsorption capacities, reaching 151.84 mg/g for Ni(II) at pH = 7 and 842.54 mg/g for Mo(VI) at pH = 3. Further investigations indicated that the adsorption of Ni(II) and Mo(VI) obeys the Langmuir isotherm model, while exhibiting pseudo-second-order kinetics and intraparticle diffusion characteristics. Notably, BECZN selectively adsorbs Ni(II) and Mo(VI) efficiently under acidic and neutral conditions, respectively. It can maintain high capacity under the interference of various cations and anions. Meanwhile, this excellent selective adsorption of Ni(II) and Mo(VI) by Co/Zn-ZIF-NH 2 is revealed at the atomic level using density functional theory (DFT) calculations. This study offers a theoretical basis and experimental reference for the design and synthesis of ZIF and biomass-based composite adsorbents.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2025
·
IF 2.6
Shengke Tang,Ding Li,Xiang Wu
The exploration of high-active and durable transition metal phosphides (TMPs) electrocatalysts is important for the development of green and sustainable energy technology. However, the poor stability and expensive prices of the catalysts restrict their applications in electrolysis of water. Doping metal atoms can improve the total performance of TMPs. Herein, we prepare several Mo doped Co0.4Fe1.6P materials through one step hydrothermal route. The Mo-Co0.4Fe1.6P-5% sample possesses 73 mV@10 mA cm-2 and 260 mV@50 mA cm-2 for HER and OER, respectively. Moreover, it delivers 1.787 V at 100 mA cm-2 for electrolysis of water. The catalysts also present a cycle life of 300 h. It demonstrates a facile approach to engineer high-performance non-precious metal electrocatalysts toward efficient water splitting.
研究领域:
能源技术
·
电化学
·
材料科学
·
催化
·
可持续能源
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Hui Lu,Hongbo Wang,Changfei Gao,Lifen Liu,Tingting Yu,Yihua Li,Shaoying Lin
Lanthanum and cerium are widely used as important raw materials for energy storage batteries due to excellent natural electrical, magnetic, and optical properties. However, with the explosive growth of new energy generation and the environmental degradation-resistant of lanthanum and cerium, it is difficult to balance environmental sustainability and resource scarcity to achieve lanthanum-cerium removal by conventional chelate salt precipitation. Herein, a laboratory-scale self-powered electro-membrane bioreactor (SPEMBR), integrating high-active nitrogen-doped carbon nanotube-loaded iron and molybdenum bimetallic conductive composite electrode membrane (M−N−CNTs@Fe/Mo) by hydrothermal and phase inversion processes was successfully constructed and evaluated for removing lanthanum cerium from industrial wastewater. The prepared bi-functional M−N−CNTs@Fe/Mo5% electrode membrane exhibited a uniform morphology and excellent hydrophilicity, with nano pore lattice spacing only 0.2637 nm. Electrochemical test results demonstrated that the novel electrode indicated excellent redox properties (i 0 = 8.35 × 10 −3 A cm −2 , C dl = 1.13 mF cm −2 ) and efficient electron transfer efficiency (R ct = 4.69 Ω, n = 3.9). Based on optimized conditions (5)% doping ratio, pH = 10, C = 20 mg/L), the SPEMBR assisted by M−N−CNTs@Fe/Mo catalytic electrode membrane achieved approximately complete removal efficiency of lanthanum and cerium (>99.2 %), superior to most publicly available related studies (86.3 %-99.0 %), but with a calculation cost of only $8.54. Identification of membrane interface products and system precipitates demonstrated that the outstanding removal efficiency was attributed to the combined reaction mechanism of electroreduction, electrocoagulation and electromembrane filtration. This work provides a bright application prospect for low-cost and effective removal of lanthanum cerium metal based on electrode membranes.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Xingyue Wu,Yiping Qiu,Junyao Li,Wenrong Cai,Datong Wu,Yong Qin,Zheng-Zhi Yin,Yong Kong
NiCo layered double hydroxide (NiCo-LDH)/ZIF-67 was in situ grown on the surface of Ni foam (NF) through hydrothermal method and subsequent solution growth method. The ZIF-67 was then hydrothermally converted into hydroxide in the presence of Mo and Ni salts for the preparation of Mo-doped NiCo-LDH (NiCoMo-LDH), and the doping of Mo endowed the NiCo-LDH with more active sites. The obtained NiCoMo-LDH showed a unique multi-dimensional “lollipop” nanostructure, which was then optimized through electrochemical reconstruction in KOH solution. During the electrochemical reconstruction, rich oxygen vacancies were generated in the NiCoMo-LDH via continuous doping/de-doping of hydroxyl ions (OH − ). Moreover, the crystallinity of the NiCoMo-LDH was greatly lowered after the electrochemical reconstruction, resulting in the generation of internal disorders and effective exposure of active sites. Owing to the abundant active sites, variable valence states, multi-dimensional nanostructure as well as rich oxygen vacancies, the electrochemical reconstructed NF@NiCoMo-LDH (ER-NF@NiCoMo-LDH) showed superior electrochemical performances. Finally, an asymmetric supercapacitor (ASC) was fabricated by using the ER-NF@NiCoMo-LDH as cathode and NF supported active carbon as anode, which had a high energy density of 0.32 mWh cm −2 (at 1.60 mW cm −2 ) and a nearly 100 % coulombic efficiency. The ASC could be used to power light-emitting diodes (LEDs) for a long time.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2020
·
IF 5.778
Worku Lakew Kebede,Dong-Hau Kuo,Fekadu Tadesse Bekena,Lalisa Wakjira Duresa
Environmentally toxic organic pollutants, namely methylene blue (MB), neutral red (NR), Rhodamine B (RhB), and methyl orange (MO) dyes contain highly toxic, carcinogenic, non-biodegradable, and colored pigments which cause harm for humans and aquatic organisms even at low concentrations. To detoxify these toxic organic pollutants from the wastewater, the bimetallic solid solution-typed In–Mo(O,S) 2 catalyst with various indium (In) contents were synthesized at low temperature through a simple precipitation method. The morphological, structural, chemical compositions, electrochemical and optical properties of the catalysts were thoroughly characterized. The photodegradation performance of the In–Mo(O,S) 2 catalysts over the cationic, anionic and neutral dyes were studied under visible light irradiation. It has been observed that the photocatalytic activity was enhanced as In was added to the Mo(O,S) 2 catalyst, and In–Mo(O,S) 2 -20 was found to be the best composition to completely degrade four organic dyes. The dye degradation had rate constant values of 9.5 × 10 −2 min −1 , 6.3 × 10 −2 min −1 , 4.4 × 10 −2 min −1 , and 15.7 × 10 −1 min −1 for MB (20 ppm), NR (20 ppm), RhB (10 ppm), and MO (10 ppm) dyes, respectively. The active species for degradation of MB is different from those for RhB and MO. Single phase In–Mo(O,S) 2 -20 capable to degrade four kinds of dyes at a fast rate is a good photocatalyst.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Yingxue Du,Qichang Li,Linping Han,Pengfei Yang,Liantao Xin,Wei Jin,Weiping Xiao,Zhenjiang Li,Jinsong Wang,Zexing Wu,Lei Wang
Designing efficient and robust pH-universal electrocatalysts for hydrogen evolution reaction (HER) is the key to boost the development of eco-friendly hydrogen energy. Herein, metallic Mo, Ru coupled with graphitic carbon dots (GQDs) activate inertness 1D copper-based nanowires (GQDs@ Ru, Mo-Cu 2 O/CF) by surface chemical oxidation, solvothermal and low temperature calcination . The metals of Mo, Ru favor the water-dissociation and optimize the hydrogen adsorption/desorption. In addition, GQDs owns edge effect and good conductivity, and then benefiting electron transport and active sites exposure. Therefore, the synthesized GQDs@ Ru, Mo-Cu 2 O/CF requires only 30, 39, 17 and 55 mV in alkaline, acidic, alkaline seawater and neutral to achieve 10 mA cm −2 . Moreover, the assembled electrolyzer requires 1.58 V to reach 10 mA cm −2 in alkaline seawater, and maintained well at 200 mA cm −2 for 100 h. This research opens a new avenue for designing efficient catalysts on energy-relation applications through introducing both metal and non-metal.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）