ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Chong Xu,Jie Zhang,Xing Qian,Weimin Wu,Jiahui Yang,Linxi Hou
Due to the unique features including well-defined void space and high surface-to-volume ratio, non-noble metal catalysts with hollow structures have received intensive researches in dye-sensitized solar cells (DSSCs) and electrochemical water splitting. Herein, we prepare a series of cobalt-incorporated molybdenum sulfide hollow nanoboxes (denoted as Co-MoS x NBs) via a one-step fleet template conversion from cube-shaped Co-based zeolitic imidazolate framework-67 which precipitated without prolonged aged process. During above transformation, it is notable that the surface morphologies of nanobox can be effectively tailored by the proportion of MoS 4 2− . The as-obtained Co-MoS x NBs with well-defined boxed structure and the appropriate doped ratio are developed as bifunctional catalysts for accelerating both reduction of I 3 − in DSSCs and hydrogen evolution reaction (HER). As expected, a high power conversion efficiency (9.64%) is achieved by Co-MoS x -1/3 NBs based DSSC under AM 1.5G irradiation, which is much preceded to that of Pt (8.39%). Meanwhile, the practical utilization of Co-MoS x -1/3 NBs for HER yields a low onset overpotential (35 mV) and a small Tafel slope (61.4 mV decade −1 ) in alkaline medium.
研究领域:
材料科学
·
电化学
·
太阳能
·
纳米技术
·
催化
✓ 已验证
DOI
高影响因子
Small Methods
·
2023
·
IF 12.4
Xuejun Zhou,Guyue Li,Yifan Yu,Meng Lei,Keyi Chen,Chilin Li
Magnesium metal batteries (MMBs) currently face challenges suffering from severe Mg metal passivation and extremely high overpotential in conventional electrolytes. Herein, a strategy of using a low-cost deep eutectic solution (DES) is proposed to modify Mg anode with the monolithic and compact coating of a MgCl 2 -Al-MgCl 2 sandwich structure, enabling the stable and reversible Mg plating–stripping behavior. An organic/nanocrystal hybrid interphase is in-situ built through a facile Mg-Al displacement reaction between aluminum-chloro clusters and Mg in AlCl 3 /Et 3 NHCl solution, and it can effectively minimize the adverse interfacial passivation reaction and surface diffusion barrier, affording the high ion-conduction and electronic insulation. This DES-assisted method guarantees a highly reversible cycling of Mg metal anode (over 5000 h at 0.1 mA cm −2 and 400 h at 2.0 mAh cm −2 ) in Mg(TFSI) 2 /DME electrolyte with the improved interfacial kinetics and low overpotential. Even at a much higher current density of 1 mA cm −2 , the overpotential only undergoes a slight increase from 0.2 V (at 0.1 mA cm −2 ) to 0.23 V. The corresponding full cells with CuS and phenanthraquinone cathodes deliver satisfactory cyclic performance. The DES modification strategy provides a new solution to the design of robust and conductive solid electrolyte interphase for achieving high-voltage and durable MMBs.
研究领域:
材料科学
·
电化学
·
能源存储
·
电池技术
✓ 已验证
DOI
高影响因子
Progress in Natural Science-Materials International
·
2024
·
IF 4.8
Xindong Zhu,Wen Huang,Yu Lou,Zhongzheng Yao,Huiqiang Ying,Min Dong,Lan Tan,Jianrong Zeng,Hua Ji,He Zhu,Si Lan
High entropy alloys (HEAs), known for their synergistic orbital interactions among multiple elements, have been recognized as promising electrocatalysts for enhancing the sluggish kinetics of oxygen evolution reaction (OER). Despite their potential, the facile and rapid preparation of HEA nanoparticles (NPs) with high electrocatalytic activity remains challenging. Here, we report an ultrafast synthesis of noble-metal-free FeCoMnCuAl HEA NPs loaded on conductive carbon fiber networks using a Joule heating strategy. The prepared HEA NPs exhibited a face-centered cubic (FCC) structure with an average size of approximately 25 nm. Synchrotron X-ray absorption fine structure (XAFS) and X-ray photoelectron spectroscopy (XPS) studies were performed to investigate the atomic and electronic structures of the HEA NPs, revealing the co-presence of Fe, Co, Mn, Cu and Al elements as well as their different valences across surface and internal regions. The HEA NPs showed remarkable OER performance, exhibiting an overpotential of 280 mV at 10 mA cm −2 and a low Tafel slope of 76.13 mV dec −1 in a 1.0 M KOH solution with high electrochemical stability, superior to commercial RuO 2 electrocatalysts. This work provides a new approach for synthesizing nanoscale noble-metal-free HEA electrocatalysts for clean energy conversion applications on a large-scale basis for practical commercialization.
研究领域:
材料科学
·
电化学
·
催化
·
能源转换
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Huawei Shen,Yichao Huang,Pengcheng Zhao,Ruili Gao,Zheyu Wei,Xiaohui Gao,Meihong Liao,Weijiang Dai,Xuezhao Liu,Desheng Sui,Jun Liu,Shangqian Zhu,Yongge Wei
Developing highly active and stable electrocatalysts for practical proton exchange membrane water electrolyzers (PEMWEs) operating at industry-relevant current densities remains a significant challenge. In particular, the hydrogen evolution reaction (HER) at ampere-level current densities leads to the rapid consumption of interfacial protons, resulting in sluggish kinetics. Herein, a strategy is proposed to reduce the proton transfer energy barriers and improve the HER kinetics at high current densities by anchoring tri-lacunary Keggin-type polyoxometalates (POMs) on Pt. The lacunary POMs clusters function as proton pumps, increasing the connectivity of hydrogen bond networks and enabling proton transfer via a proton-coupled electron transfer mechanism. In addition, an unconventional Tafel step mediated by short-pathway hydrogen spillover from POMs clusters to Pt active sites is also created. As a result, an ultra-high mass activity of 782.94 A·mg Pt −1 and remarkable durability over 6000 h at a current density of 2000 mA·cm −2 can be simultaneously achieved in a practical PEMWE with an ultralow Pt loading mass of 4.2 µg Pt ·cm −2 . The strategy provides new opportunities in developing next-generation low-Pt electrocatalysts for PEMWE applications.
研究领域:
电催化
·
能量转换
·
水电解
·
材料科学
·
催化剂设计
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
RAPID COMMUNICATIONS IN MASS SPECTROMETRY
·
2020
·Vol. 34
·期 21
·e8899
·
IF 2.2
Hanfeng Jin,Jiuzhong Yang,Aamir Farooq
Rationale Aromatic hydrocarbons play an important role in the formation and growth of polycyclic aromatic hydrocarbon (PAH) and soot particles. Measurements of their absolute photoionization cross-sections (PICSs), that benefit the quantitative investigation of mass spectrometry, are still lacking, however. Methods PICSs of some aromatic hydrocarbons were measured with tunable synchrotron vacuum ultraviolet photoionization mass spectrometry (SVUV-PIMS). Nitric oxide and benzene were chosen as standard references for PICS calibration, since their photoionization cross-sections are well documented in the literature. Binary liquid mixtures of the investigated molecules and their specific solvents were used in the measurements. Results The investigated aromatics include naphthalene, phenanthrene, 1-methylnaphthalene, indene, 2-/3-/4-methylphenylacetylene, 2-methylindene, diphenylacetylene, 1-/2-ethynylnaphthalene and acenaphthylene. Photo-induced fragments from the molecules were also observed with increasing photon energy. Conclusions Based on our measurements and literature data, PICSs of most aromatic molecules have very similar values beyond their ionization energies. However, molecules that contain the phenylacetylene structure have PICSs higher than other aromatics.
研究领域:
分析化学
·
质谱学
·
大气化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Jie Huang,Xue Fan,Fei Yan,Jiyang Liu
Herein, we develop a simple electrochemical sensor based on the confinement effect of vertically ordered mesoporous silica film (VMSF) and the o-phenanthroline (Phen) chelating agent for ultrasensitive determination of ferrous ions (Fe2+). Fe(Phen)32+ obtained from the chelation between Fe2+ and Phen, shows higher electrochemical activity and larger geometric dimensions compared with free Fe2+, which could be effectively preconcentrated into the inner nanochannels of VMSF through spatial and electrostatic confinement effects. Differing from the conventional anodic stripping voltammetry, Fe(Phen)32+ could be enriched by convenient mechanical stirring and further detected by VMSF-modified indium tin oxide (VMSF/ITO), achieving an outstanding detection performance in terms of a linear range (1.0 nM–13.0 μM) and a limit of detection (LOD, 0.66 nM). Moreover, the established electrochemical sensor can accurately measure total iron and distinguish between different valence states (Fe2+ or Fe3+) with the help of reducing agents. Thanks to the outstanding antifouling ability of VMSF, the sensing platform consisting of VMSF/ITO and Phen chelating agent enables the precise determination of Fe2+ in complex real samples including tap water, pond water, FeSO4 tablets, and even colored samples, which can avoid the tedious sample pretreatment process and be applied in a wide range of scenarios.
研究领域:
分析化学
·
材料科学
·
环境科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Qihang Lv,Tianyuan Xiao,Guohua Dong,Xiaoxiao Tan,Zhuanfang Zhang,Ming Zhao,Min Zhu,Jinlong Li,Wenzhi Zhang
The exploration of environmentally friendly slow-release fertilizer (SRF) based on natural bio-polymers is of great importance in the development of modern agriculture and horticulture. Herein, a novel starch carbamate (SC) modified sodium alginate (SA) hydrogel (SC/SAH) was prepared utilizing as-synthesized SC and natural SA through the cationic ions crosslinking method and ultimately the corresponding slow-release fertilizer (SC/SAH-SRF) was successfully developed by immersing the dried SC/SAH matrix into saturated urea solution. Due to the low gelation temperature and high viscosity of the synthesized SC, the formed SC/SAH exhibits significantly enhanced properties including excellent water absorbency up to 8.02 g/g with considerable repeatability, abundant pore structure and high hydrophilicity compared with the neat SAH and natural starch based hydrogel (NS/SAH). Accordingly, the SC/SAH leads to higher urea loading amount ∼ 1.28 g/g. Importantly, the resultant SC/SAH-SRF also shows superior slow-release performance, yielding a cumulative urea release of only 61.6 % within 10 h and almost completely release >16 h in water, what's more, only 58.5 % of the urea releases within 25 days and exceeding 50 days for complete release in soil column assays. The slow-release of urea from SC/SAH-SRF well complies for the first-order kinetics and accomplishes via a non-Fickian diffusion process. Moreover, the pot experiment demonstrates that the SC/SAH-SRF has higher growth promotion role for the maize seedlings than those of others. Consequently, this work provides a novel strategy for preparing environmentally friendly SRF by blending modified starch and hydrogel.
研究领域:
农业科学
·
环境科学
·
材料科学
·
生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Chemistry-An Asian Journal
·
2023
·Vol. 18
·期 16
·e202300440
·
IF 4.1
Wen Sun,Ying Fang,Gaoming Sun,Congfu Dai,Yana Liu,Jiguang Zhang,Yunfeng Zhu,Jun Wang
Graphical A rutile Ru 0.75 Mn 0.25 O 2−δ solid solution oxide with a porous structure and high Ru >4+ proportion has been developed as an efficient electrocatalyst for simultaneously boosting oxygen evolution reaction under acidic and alkaline conditions, outperforming the commercial RuO 2 and many previously reported catalysts. Proton exchange membrane water electrolysers and alkaline exchange membrane water electrolysers for hydrogen production suffer from sluggish kinetics and the limited durability of the electrocatalyst toward oxygen evolution reaction (OER). Herein, a rutile Ru 0.75 Mn 0.25 O 2−δ solid solution oxide featured with a hierarchical porous structure has been developed as an efficient OER electrocatalyst in both acidic and alkaline electrolyte. Specifically, compared with commercial RuO 2 , the catalyst displays a superior reaction kinetics with small Tafel slope of 54.6 mV dec −1 in 0.5 M H 2 SO 4 , thus allowing a low overpotential of 237 and 327 mV to achieve the current density of 10 and 100 mA cm −2 , respectively, which is attributed to the enhanced electrochemically active surface area from the porous structure and the increased intrinsic activity owing to the regulated Ru >4+ proportion with Mn incorporation. Additionally, the sacrificial dissolution of Mn relieves the leaching of active Ru species, leading to the extended OER durability. Besides, the Ru 0.75 Mn 0.25 O 2−δ catalyst also shows a highly improved OER performance in alkaline electrolyte, rendering it a versatile catalyst for water splitting.
研究领域:
材料科学
·
电化学
·
能源材料
·
催化
✓ 已验证
DOI
高影响因子
ACS Omega
·
2024
·
IF 3.7
Yang Xie,Peng Li,Dong Fu,Fan Yang,Xin Sui,Bo Huang,Jiaying Liu,Jialong Chi
Cannabidiol (CBD) has demonstrated its potential to enhance depression treatment through various biological pathways. However, the application potential of CBD is significantly impeded by its polymorphic nature, limited water solubility, and hepatic first-pass metabolism. To improve chemical stability and water solubility, nanostructured lipid carriers loaded with CBD (CBD-NLCs) were developed using a hot-melt emulsification method and optimized by response surface methodology (RSM). The process parameters were optimized using a four-factor and three-level Box–Behnken experimental design consisting of 29 experiments. The CBD-NLCs were formulated and characterized, demonstrating desirable properties, including a mean particle size of 54.33 nm, a PDI value of 0.118, a zeta potential of −29.7 mV, and an impressive encapsulation efficiency rate of 87.58%. The nanoparticles were found to possess an approximately spherical shape, as revealed by scanning and transmission electron microscopy. The stability studies have demonstrated that CBD-NLCs effectively mitigated the photodegradation of CBD and exhibited a stable behavior for 42 days when stored. The CBD-NLCs displayed a biphasic release profile characterized by an initial burst release (over 50% of CBD released within 20 min) followed by a subsequent gradual and sustained release, aligned with first-order kinetics and Fickian diffusion. These findings demonstrate the potential suitability of this formulation as a carrier for CBD in food fortification and pharmaceutical applications.
研究领域:
药剂学
·
纳米技术
·
药物递送系统
·
生物药剂学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Zhiliang Feng,Zekun Geng,Shuzhen Pan,Yaru Yin,Xinzhi Sun,Xiaojuan Liu,Lei Ge,Feng Li
The electrocatalytic valorization of glycerol is an emerging upcycling process for the biomass utilization. In this work, nickel/sulfur-codoped laser-induced graphene (LINiSG) on flexible polyimide film was fabricated and demonstrated as a self-supported and binder-free monolithic electrode for electrocatalytic glycerol oxidation reaction (EGOR) towards the selective generation of value-added three-carbon (C3) chemicals. The laser-induced in-situ and synchronous carbonization of polysulfone and Ni precursor was demonstrated to remarkably promote both the electrochemical surface area and Ni loading of LINiSG electrode. These synergistic merits are considered as the main origin for its enhanced EGOR activity and stability, showing much smaller Tafel slope and 2-fold enhanced current density, as compared to LINiG electrode without the co-carbonization of polysulfone. The influence of experimental parameters has been systematically investigated by the product analysis, achieving an average 94.7 % C3 selectivity and 76.1 % C3 Faradaic efficiency with a high selectivity of dihydroxyacetone (ca. 67.7 %) in near-neutral conditions, which is better than most of the reported EGOR electrodes operated in near-neutral conditions. This work demonstrated the viability of using flexible self-supported and binder-free LIG electrode with rational design and preparation approach for electrocatalytic valorization of biomass.
研究领域:
电化学
·
材料科学
·
可持续化学
·
生物质利用
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·Vol. 107
·期 2
·704-718
·
IF 3.9
Jian Bao,Wei Du,Haitao Wu,Zhenxing Yue
In this study, two novel microwave dielectric ceramics were designed and synthesized using the solid-state reaction method based on the CaO–MoO 3 –La 2 O 3 pseudo-ternary phase diagram. The X-ray diffraction (XRD) patterns and Rietveld refinement results indicate that pure phase microwave dielectric ceramics (CaLa 2 (MoO 4 ) 4 and Ca 3 MoO 6 ) can be produced with CaO, MoO 3 , La 2 O 3 ratios of 1, 1, 4, and 3, 1, 0, respectively. CaLa 2 (MoO 4 ) 4 shows the potential value for application in Low Temperature Co-fired Ceramic technology. In addition, the Phillips–van Vechten–Levine theory, infrared reflectance spectrum, and THz time-domain spectrum are used further to study the structure-property relationship of the two ceramics. Finally, a 5G patch antenna used in Sub-6 GHz communication technology was successfully designed and manufactured. The study of the relationship between chemical bonds and dielectric properties of the two ceramics, along with the development of the patch antenna, establishes a foundation for scientific research and practical applications in related ceramic systems.
研究领域:
材料科学
·
陶瓷
·
电磁工程
·
电信
✓ 已验证
DOI
高影响因子
Materials Chemistry Frontiers
·
2024
·
IF 6
Yuru Zhou,Jing Hu,Yinan Liu,Wenyu Fan,Panpan Tao,Rui Yang,Haitao Huang,Xun Cao,Haijin Li,Siwei Li
Designing noble metal-free electrocatalysts remains a challenge for the oxygen evolution reaction (OER) in alkaline solutions. In this study, we present a facile electrodeposition approach coupled with an in situ anodic oxidation method to synthesize NiOOH–MnS/NF on nickel foam (NF), successfully creating NiOOH–MnOOH/NF heterojunctions to boost OER performance under alkaline conditions. The heterojunction's synergistic effect significantly modulates the adsorption energy of the rate-determining step (RDS), thereby enhancing the intrinsic electrocatalytic activity of the NiOOH–MnOOH/NF electrocatalyst. Furthermore, the introduction of SO42− leads to a variable degree of electron loss in both Mn and Ni, reducing adsorption strength of the OER intermediates and thus optimizing reaction kinetics. The as-prepared NiOOH–MnOOH/NF electrocatalyst demonstrates exceptional OER performance in 1.0 M KOH, achieving a current density of 100 mA cm−2 with a Tafel slope of 52.3 mV dec−1 and a minimal overpotential of 391 mV. Utilizing NiOOH–MnOOH/NF as a bifunctional electrode for overall water splitting (OWS), the system operates at a low potential of 1.66 V at 10 mA cm−2, showcasing its excellent durability. This work offers novel insights and promising prospects for the advancement and practical application of non-precious metal electrocatalysts in the field of electrocatalytic water splitting.
研究领域:
电化学
·
材料科学
·
催化
·
能量转换与存储
✓ 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）