ACTA MATERIALIA
·
2024
·
IF 8.3
Tianqi He,Xiaoya Kang,Lu Wang,Yunlong Yang,Qianghong Wu,Yuanyou Peng,Fen Ran
In recent years, heterojunction has attracted widespread attention as an anode for sodium-ion batteries since they can effectively optimize the materials’ rate performance and cycling stability. However, the advantage is choked by multi-element composition and stepwise synthesis process. Herein, cobalt sulfide (Co 9 S 8 /CoS) homologous heterojunction deposited at vanadium nitride/carbon nanofibers is synthesized as an excellent anode for high-performance sodium-ion batteries in one step by employing the “3 d -orbital electron complementary effect” combined with high-temperature heat-treatment technology. The Co 9 S 8 /CoS homologous heterojunction successfully overcomes the inherent drawback of Co 9 S 8 and possesses an ultrafast charging/discharging process, outstanding reversible specific capacity, and remarkable rate capability. A systematic study reveals that vanadium nitride is a key trigger for forming Co 9 S 8 /CoS heterojunction. When used as anode materials for sodium-ion batteries, it reaches a high specific capacity of 353.0 mAh/g at a current density of 10 A/g (615.8 mAh/g at a current density of 0.05 A/g) due to the presence of heterointerface. Theoretical calculations show that the construction of the heterostructure enhances the sodium-ion storage capacity and storage kinetics compared with pristine Co 9 S 8 . This discovery opens an interesting strategy for constructing homogeneous heterojunctions and broadens the horizons for designing energy storage and conversion materials.
研究领域:
材料科学
·
能源存储与转换
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DOI
高影响因子
Energy & Environmental Science
·
2017
·Vol. 10
·期 3
·772-779
·
IF 29.518
Kai-Hang Ye,Zilong Wang,Jiuwang Gu,Shuang Xiao,Yufei Yuan,Yi Zhu,Yuanming Zhang,Wenjie Mai,Shihe Yang
Here, we demonstrate that carbon quantum dots (CQDs), as a low cost, chemically stable, and environmentally friendly photosensitizer, can dramatically broaden the light absorption range to the entire visible range. Consequently, the NiOOH/FeOOH/CQD/BiVO4 (NFCB) photoanode has achieved a remarkable photocurrent density of 5.99 mA cm−2 at 1.23 V vs. RHE under AM 1.5G in KH2PO4 aqueous solution without a hole scavenger (pH = 7) and a record high applied bias photon-to-current efficiency of 2.29% at 0.6 V vs. RHE for BiVO4-based photoanodes. This novel NFCB photoanode could operate stably for 10 h with a Faraday efficiency of ∼95%, demonstrating the great potential of using CQDs for solar water splitting.
研究领域:
材料科学
·
可再生能源
·
环境科学
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DOI
高影响因子
Small
·
2024
·
IF 13
Yixuan Li,Jiahui Jiang,Qihao Wu,Yuying Feng,Zhongxu Chen,Guancheng Xu,Li Zhang
The development of energy- and time-saving synthetic methods to prepare bifunctional and high stability catalysts are vital for overall water splitting. Here, V-doped nickel-iron hydroxide precursor by etching NiFe foam (NFF) at room temperature with dual chloride solution (“NaCl-VCl3”), is obtained then phosphating to obtain V-Ni 2 P-FeP/NFF as efficient bifunctional (oxygen/hydrogen exchange reaction, OER/HER) electrocatalysts, denoted as NFF(V, Na)-P. The NFF(V, Na)-P requires only 185 and 117 mV overpotentials to reach 10 mA cm −2 for OER and HER. When used as a catalyst for water splitting in a full cell, it can be stably sustained for more than 1000 h in alkaline brine electrolysis at both current densities of 100 and 500 mA cm −2 . In situ Raman analyses and density functional theory (DFT) show that the V-doping-induced surface remodeling generates hydroxyl oxides as the true catalytic active centers, which not only enhances the reaction kinetics, but also reduces the free energy change in the rate-determining step. This work provides a cost-effective substrate self-derivation method to convert commercial NFF into a powerful catalyst for electrolytic brine, offering a unique route to the development of efficient electrocatalysts for saline water splitting.
研究领域:
材料科学
·
电化学
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Mengjiao Jiao,Guishang Pei,Lilian Yang,Zhuoyang Li,Qiyuan Mi,Xuewei Lv
In the sodium-assisted smelting process of vanadium-titanium-magnetite (VTM), titanium oxide is hydrothermally separated by sulfuric acid solution leaching. Therefore, it is essential to study the dissolution behavior and mechanism of sodium titanates in sulfuric acid solution. High-purity Na 8 Ti 5 O 14 , Na 2 Ti 3 O 7 , and Na 2 Ti 6 O 13 samples were synthesized via solid-phase chemical reaction, and their solubilities of sodium titanates in 100 mL of 98 wt% sulfuric acid solution were determined. Na 8 Ti 5 O 14 , Na 2 Ti 3 O 7 , and Na 2 Ti 6 O 13 crystallize in the triclinic (space Group P -1), monoclinic (space Group P 2 1 / m ), and monoclinic (space Group C 2/ m ) system, respectively. The dissolution rate of sodium titanates in 98 wt% sulfuric acid solution increased significantly with rising reaction temperature. Among the sodium titanates studied, Na 8 Ti 5 O 14 showed the highest dissolution rate, followed by Na 2 Ti 3 O 7 and Na 2 Ti 6 O 13 . Kinetic analysis indicated that the dissolution behavior of sodium titanates in sulfuric acid was all governed by chemical reactions. The apparent activation energies of the dissolution reactions of Na 8 Ti 5 O 14 , Na 2 Ti 3 O 7 , and Na 2 Ti 6 O 13 with sulfuric acid were derived to be 49.48 kJ/mol, 53 kJ/mol, and 67.41 kJ/mol, respectively. The solubilities of Na 8 Ti 5 O 14 , Na 2 Ti 3 O 7 , and Na 2 Ti 6 O 13 in 100 mL of 98 wt% concentrated sulfuric acid at 20 ℃ were determined to be 18.6077 g, 7.3297 g, and 3.9948 g, respectively. Additionally, the dissolution rates and solubilities of sodium titanates and other impurities, such as aluminate and silicate, were compared, demonstrating the effectiveness of separation in sulfuric acid solution following the sodium-assisted smelting process of VTM. In this study, it is suggested that the separation of titanium oxide from other impurities during the sulfuric acid leaching of titanium-containing slag can be accomplished based on the varying solubilities of the phases.
研究领域:
化学工程
·
材料科学
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产品关联
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Ali Junaid,Faiqa Noreen,Abdus Sami,Karam Jabbour,Khadija Bibi,Muhammad Ammar Hassan Shah,Nigarish Bano,Muhammad Shuaib Khan,Asma A. Alothman,Syed Imran Abbas Shah
Pursuit of green hydrogen production is paramount, given escalating energy demands, resulting in quest for electrodes capable of water electrolysis, yielding green H 2 devoid of carbon dioxide, has posed a formidable challenge. Anodes and cathodes crafted from transition metal oxides (TMOs) reign supreme in water splitting due to their robust supporting capacity, potent redox capabilities, facile alteration of valence states, and superior electrical conductivity. In this study, a cutting-edge transition metal oxide nano-composite catalyst, comprised of Ag 3 VO 4 @ZnO, is synthesized via a facile hydrothermal method. Ag 3 VO 4 @ZnO catalyst showcases remarkable electrocatalytic prowess in both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) when deployed in a 1.0 M potassium hydroxide (KOH) electrolyte, having active surface area of 140 cm 2 . Operating at a current density of 10 mA cm −2 , Ag 3 VO 4 @ZnO exhibits diminished overpotentials of 142 mV and 248 mV for HER and OER, respectively. Furthermore, it demonstrates lower Tafel slopes of 92 mV dec −1 and 46 mV dec −1 , alongside reduced charge-transfer resistances of 153 Ω.cm 2 and 2.60 Ω.cm 2 for HER and OER, respectively. Ag 3 VO 4 @ZnO showcases largest active surface area, minimal Tafel slope, and lower charge transfer resistance. Practical two electrode configuration exhibited exceptional 50-hour stability, along with Tafel slope values of 73 and 98 mV dec −1 for OER and HER, respectively. The reliable performance of electrode material in practical device configuration, makes it a practically viable alternative for current state-of-the-art catalysts.
研究领域:
材料科学
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可再生能源
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Xiaoyang Jia,Zhongrui Lu,Kai Huai,Xiancan Yuan,Zhuoran Yang,Rui Huang,Shaoxiong Zhai,Qing Ye,Zhanfeng Deng,Jun Lin,Shaojian He
Covalent organic frameworks (COFs) are highly porous crystalline polymers with well-defined pore structures, exhibiting great potential for the use of composite membranes to separate ions with different sizes. However, COFs are mostly insoluble and poorly dispersed in common solvents, making it very difficult to well disperse COFs in polymer matrix to prepare high-quality composite membranes. In this work, a MS hybrid was prepared by in-situ growing COFs on the surface of Ti 3 C 2 T x MXenes, which helps improve the filler-matrix compatibility significantly. The synergetic effect of the two-dimensional structure of MXene nanosheets and the porosity of COF components in MS contributes to the improvement for the ion selectivity of the composite membranes (SPEEK/MS). The vanadium flow battery (VFB) loaded with the SPEEK/MS-10 membrane achieves the energy efficiency of 93 % at 40 mA cm −2 , as compared to 86 % for that with the SPEEK control membrane. Moreover, the improved cycling stability and capacity retention was achieved for the SPEEK/MS-10 based VFB. Therefore, this work provides a promising strategy to fabricate high-performance COF-based composite PEMs for the VFB applications.
研究领域:
材料科学
·
能源技术
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产品关联
DOI
高影响因子
Engineering
·
2025
·
IF 11.6
Wenyue Yan,Baogang Zhang,Yi’na Li,Jianping Lu,Yangmei Fei,Shungui Zhou,Hailiang Dong,Fang Huang
Microbial vanadate (V(V)) reduction is a key process for environmental geochemistry and detoxification of vanadium (V). However, the electron transfer pathways and V isotope fractionation involved in this process are not yet fully understood. In this study, the V(V) reduction mechanisms with concomitant V isotope fractionation by the gram-positive bacterium Bacillus subtilis ( B. subtilis ) and the gram-negative bacterium Thauera humireducens ( T. humireducens ) were investigated. Both strains could effectively reduce V(V), and (90.5% ± 1.6%) and (93.0% ± 1.8%) of V(V) at an initial concentration of 50 mg·L −1 was removed over 10 d incubation, respectively. V(V) was bioreduced to insoluble vanadium (IV), which was distributed both inside and outside the cells. Electron transfer via cytochrome C, nicotinamide adenine dinucleotide, and glutathione played critical roles in V(V) reduction. Metabolomic analysis showed that differentially enriched metabolites (quinone, biotin, and riboflavin) mediated electron transfer in both strains. The aqueous V in the remaining solution became isotopically heavier as V(V) bioreduction proceeded. The obtained V isotope composition dynamics followed a Rayleigh fractionation model, and the isotope enrichment factor ( ε ) was (–0.54‰ ± 0.04‰) for B. subtilis and (–0.32‰ ± 0.03‰) for T. humireducens , with an insignificant difference. This study provides molecular insights into electron transfer for V(V) bioreduction and reveals V isotope fractionation during this bioprocess, which is helpful for understanding V biogeochemistry and developing novel strategies for V remediation.
研究领域:
环境微生物学
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地球化学
·
生物化学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Biao Yuan,Pan Wu,Changjun Liu,Jian He,Wei Jiang
The challenge of separating and recovering V(V) and Cr(VI) from wastewater is critical for environmental protection and industrial productivity due to the chemical similarities. In this study, a novel zirconium-based adsorbent with superior adsorption performance and selectivity was synthesized using the Sol-Gel method, with a specific surface area of up to 265.3 m 2 /g. The maximum adsorption capacities of V(V) and Cr(VI) were 222 and 123 mg/g, respectively. The adsorption process followed the Langmuir isothermal adsorption and the pseudo-second-order kinetic model. The adsorption mechanism was thoroughly investigated confirming that the adsorption of V(V) and Cr(VI) on amorphous hydrous ZrO 2 (AHZOs) is chemisorption. At a pH of 3, the values of ΔG 0 (−46.8 kJ/mol) and E ads (−5.67 eV) for the main existing form H 3 V 10 O 28 3- on AHZOs are lower than those for the main existing form HCrO 4 - . V(V) replaced the adsorbed Cr(VI) during competitive adsorption to achieve selective adsorption of V(V) with a separation coefficient as high as 3142. The adsorption capacity of V(V) remains above 105 mg/g after five cycles. After adsorption, the purity of Cr(VI) can be increased to above 99.5 %, and a solution of V(V) with a purity higher than 99.25 % can be obtained after desorption. The use of 3 g/L and 100 g/L adsorbent can decrease the single V(V) and Cr(VI) to 1.618 mg/L and 0.36 mg/L, respectively, and meet the emission standards.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
Advanced Science
·
2025
·
IF 14.1
Hai Zhu,Tinghua Li,Xinhao Peng,Xiaoxian Zhang,Xuequan Zhang,Qiusheng Wang,Lei Lei,Jun Zhang,Bin He,Jun Cao
MXenzymes, a promising class of catalytic therapeutic material, offer great potential for tumor treatment, but they encounter significant obstacles due to suboptimal catalytic efficiency and kinetics in the tumor microenvironment (TME). Herein, this study draws inspiration from the electronic structure of transition metal vanadium, proposing the leverage of TME specific-features to induce structural transformations in sheet-like vanadium carbide MXenzymes (TVMz). These transformations trigger cascading catalytic reactions that amplify oxidative stress, thereby significantly enhancing multimodal tumor therapy. Specifically, the engineered HTVMz, coated with hyaluronic acid, exhibits good stability and generates a thermal effect under NIR-II laser irradiation. The thermal effect, combined with TME characteristics, facilities a structural transformation into ultra-small vanadium oxide nanozymes (VO x ). The enlarged surface area of VO x substantially enhances ROS regeneration and amplifies oxidative stress, which promotes lysosomal permeability and induces endoplasmic reticulum stress. The high-valent vanadium in VO x interacts with intracellular glutathione, disrupting redox homeostasis and intensifying oxidative stress further. These amplifications accelerate tumor apoptosis, induce ferroptosis, and suppress HSP90 expression. Consequently, the heightened thermal sensitivity of HTVMz synergistically promotes tumor cell death via multimodal therapeutic pathways. This study presents an innovative strategy for tumor catalytic therapy by manipulating MXenzymes structures, advancing the field of catalytic therapy.
研究领域:
生物医学工程
·
肿瘤学
·
纳米医学
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产品关联
DOI
PubMed
高影响因子
Advanced Energy Materials
·
2024
·
IF 24.4
Wenqiang Hu,Jiahe Zang,Qisen Wang,Siyuan Xiao,Jichao Zhang,Fang Fang,Zhongliang Ma,Dalin Sun,Yun Song
Magnesium hydride (MgH 2 ) is a promising hydrogen storage material for its high hydrogen capacity of 7.6 wt.%. However, the further application is severely hampered by the sluggish reaction kinetics and stable thermodynamics. Introducing catalysts is an effective method to improve the reaction rate, but the catalytic activity tends to decrease with an increasing number of reaction cycles, due to the highly reductive Mg and H species. Herein, the spring effect has been observed in the P doped Li 3 VO 4 , in which both V─P and V─V bonds undergo compression and elongation during hydrogen absorption and desorption, respectively. Such a unique self-regulation spring effect not only improves the reaction kinetics of MgH 2 , but also maintains the high activity of P doped Li 3 VO 4 , thereby ensuring the hydrogen capacity of MgH 2 even after 100 loops. This spring effect of chemical bonding, stretched-recovered-stretched with the motion between the highly reductive Mg and H species, will provide insight into catalyst design for hydrogen-related industries.
研究领域:
材料科学
·
能源存储与转换
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yuexin Liu,Tongde Wang,Yuning Sun,Mingcheng Zhang,Guohua Gao,Jinhu Yang,Kefeng Cai
Layered vanadium oxides have recently emerged as ideal cathode materials for aqueous zinc-ion batteries (ZIBs) due to their high theoretical capacity and low cost. However, their inherent shortages of narrow interlayer distance and poor electric conductivity cause sluggish reaction kinetics and low structure stability, leading to battery performance deterioration. Herein, we developed a novel strategy to simultaneously realize the intercalation of conductive polymer into V 2 O 5 polyhedrons and exfoliation of the V 2 O 5 into ultrathin nanosheets. The strategy is realized by in-situ polymerization of 3,4-ethylene-dioxythiophene (EDOT) monomers in the interlayer of the V 2 O 5 polyhedrons that were derived from the annealing of vanadium-based metal–organic frameworks (MIL-100(V)) in air. The MIL-100-derived V 2 O 5 polyhedrons assembled into porous microspheres (PVO) with abundant porosity and small particle size, which facilitates the penetration of EDOT molecules into the interior of the PVO during in-situ intercalation and polymerization processes, ultimately leading to the V 2 O 5 polyhedrons exfoliating into ultrathin nanosheets. The uniform poly(3,4-ethylene-dioxythiophene) (PEDOT) layer and abundant oxygen vacancies in PVO@PEDOT nanosheets can accelerate the diffusion of electrons and zinc ions, which are evidenced by dynamic analysis, ex-situ characterizations, and density functional theory (DFT) calculations, revealing the synergetic effect of PEDOT and oxygen vacancies. Therefore, the PVO@PEDOT cathode exhibits high specific capacity (403.7 mAh g -1 at 0.2 A g -1 ), superior rate capability (312.8 mAh g -1 at 10 A g -1 ), and long-term stability (92.8% of the initial capacity remained after 3000 cycles), which is superior to the majority of ion intercalation improved V 2 O 5 .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2024
·Vol. 16
·期 23
·11250-11261
·
IF 5.8
Tingxia Wang,Xu Zhang,Xiaojiao Yu,Yun Liu,Junpeng Li,Zongbin Liu,Ningning Zhao,Jian Zhang,Jinfen Niu,Qingliang Feng
High-efficiency water electrolysis over a broad pH range is desirable but challenging. Herein, Ru-decorated VS2 on carbon cloth (Ru–VS2/CC) has been in situ synthesized, which features the regulated electronic structure of VS2 by introducing Ru. It is remarkable that the optimal Ru–VS2/CC displays excellent electrocatalytic hydrogen evolution activity with overpotentials of 89 and 87 mV at −10 mA cm−2 in 0.5 M H2SO4 and 1.0 M KOH, respectively. Theoretical calculations and electrocatalytic measurements have demonstrated that introducing Ru induces an enhanced charge density around the Fermi level, facilitating charge transfer and speeding up the electrocatalytic HER kinetics. The Gibbs free energy of the hydrogen intermediate (ΔGH*) of Ru–VS2/CC (0.23 eV) is much closer to zero than that of pure VS2 (0.51 eV) and Ru (−0.37 eV), demonstrating an easier hydrogen adsorption and desorption process for Ru–VS2/CC. The more favorable ΔGH*, differential charge density and the d-band center endow Ru–VS2 with enhanced intrinsic electrocatalytic activity. This study presents a feasible strategy for enhancing electrocatalytic HER activity by the regulation of the electronic structure and the rational integration of dual active components.
研究领域:
材料科学
·
电催化
·
理论计算
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）