DESALINATION
·
2024
·
IF 8.3
Jing Shang,Luhua Wang,Jihui Cao,Shitong Han,Chao Xu
Flexible devices have shown great application potential in portable and miniaturized devices. However, work on flexible electrodes for capacitive deionization (CDI) has not been well developed due to the issues of desalination property, processability , and availability under actual bending conditions. Herein, we constructed a kind of flexible lamellar MXene membrane by assembling Ti 3 C 2 T x sheets with both crumpled and perforated structures and studied their desalination performance in conventional planar and bent configurations. The crumpled and perforated features in Ti 3 C 2 T x (C-P-TC) nanosheets could optimize the in-plane and out-of-plane diffusion channels of the stacked samples, respectively, effectively improving the accessibility of membranes. As a result, the desalination performance of such C-P-TC electrodes was superior to that of those assembled from crumpled or perforated sheets alone. Significantly, this flexible C-P-TC electrode still showed excellent performance at real bend deformation, which possessed not only almost the same CDI capacity as the traditional planar configuration but also good cycling stability. This work not merely proposes an alternative strategy to improve the CDI performance of lamellar MXene electrodes by regulating the nanostructures of channels but also confirms their effective deionization ability under real bent state, greatly facilitating the potential use of flexible electrodes in miniaturized CDI devices.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2024
·
IF 5.4
HanChi Hu,HongXia Chen,ShuangWu Xu,MengCheng Zhou,XinYu Zhang,Tao Shen,HaiChen Li,HongMing Zhou
As a leading sodium-ion battery cathode material, O3-type layered oxides combine excellent theoretical specific capacity and cost-effectiveness, offering potential solutions for the large-scale energy storage industry. However, they still struggle with significant capacity degradation and inferior battery performance due to the narrow Na+ diffusion channels and complex phase. In this paper, we introduce Sb ions into the NaNi0.3Fe0.2Mn0.5O2 cathode material to improve its electrochemical performance. Our findings demonstrate that doping Sb results in an expansion of the Na layer spacing and cell volume, contributing to faster diffusion of Na+. Furthermore, the Na+/vacancy ordering and undesirable phase transition under high pressure are inhibited in the synthesized Na(Ni0.3Fe0.2Mn0.5)0.98Sb0.02O2 cathode material, which obtains a more boosting structure and advanced electrochemical performance. Within the voltage range of 2.0–4.2 V, the cathode material possesses an initial discharge specific capacity of 127.71 mAh g–1 and maintains a capacity retention of 82.34% (64.33% before doping) after 100 cycles. Moreover, at a 10 C current density, a high discharge specific capacity of 90.26 mAh g–1 is observed in the doped material. These results contribute essential insights for the design and advancement of cathode materials for sodium-ion batteries with outstanding properties.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Qinghui Wu,Zhezheng Ding,Caijian Wang,Zijie Chen,Kunyan Sui,Yuan Liu,Pengfei Qi
Ion-sieve materials are effective and economical to extract and recovery liquid lithium in practical applications. However, it is greatly limited by its lower actual adsorption capacity than theory value as well as its tardy diffusion rate. Here, a hollow nanofiber Li 4 Ti 5 O 12 with the outer wall of acicular lamellas (LTO-A) were prepared via electrostatic spinning followed by hydrothermal lithiation techniques, showing super-high and ultra-fast extraction of lithium ions. The as-prepared LTO-A displayed abundant ions diffusion channels, polycrystalline property and large surface areas. It exhibits a remarkable adsorption capacity of 60.8 mg·g −1 , approaching to its theoretical adsorption capacity. More surprisingly, the cracks between the massive acicular lamellas facilitate the transport of lithium ions, reaching a rapid equilibrium extraction within 20 min. The LTO-A present high selectivity and stability during cycle experiments. Additionally, the matrix mixed membrane with loaded LTO-A demonstrate high lithium ions conductivity. The structure characterization and DFT calculation showed that abundant ions diffusion channels and the exposed crystal planes of (440), (400) and (111) paly central roles for the outstanding performance of LTO-A. This study provides a promising avenue for the efficient and rapid extraction of lithium from complex aqueous solutions.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2025
·Vol. 172
·期 5
·050532
·
IF 3.3
Xin-Ming Fan,Ke-Bo Lin,Pei-Yao Li,Jia-Feng Zhang,Ling-Jun Li,Jie-Xi Wang,Xia-Hui Zhang,Jun-Chao Zheng
The exponentially growing global demand for lithium resources has accelerated the development of sodium-ion batteries (SIBs) as a promising alternative to conventional lithium-ion batteries. In this work, we successfully synthesized a novel open-framework layered material, Na2[(VO)2(HPO4)2(C2O4)] (designated as NaVPC), through an eco-friendly one-step hydrothermal method that eliminates energy-intensive post-calcination processes. The unique architecture of NaVPC features (1) three-dimensional ion diffusion channels enabling reversible Na+ extraction/insertion, (2) minimal lattice contraction (<3%) during cycling, and (3) an exceptional average operating voltage of 3.8 V vs Na+/Na. When composited with single-walled carbon nanotubes, the hybrid electrode delivers enhanced electrochemical performance, achieving a specific capacity of 80.6 mAh g−1 at 0.1 C and maintaining 91.7% capacity retention after 100 cycles at 2 C. Through a combination of ex situ X-ray diffraction, X-ray photoelectron spectroscopy, and density functional theory calculations, we systematically investigated the structural evolution and Na+ migration mechanism, establishing a fundamental framework for understanding the charge storage behavior in this open-framework material.
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
Journal of Energy Chemistry
·
2019
·
IF 5.162
Ziyue Zhou,Wenping Si,Pengyi Lu,Wenlei Guo,Lei Wang,Tao Zhang,Feng Hou,Ji Liang
Due to the sufficient ion diffusion channels provided by the large interlayer spacing, layered silicates are widely considered as potential anode materials for lithium ion and sodium ion batteries . However, due to the poor electronic conductivity , the application of layered silicates for electrochemical energy storage has been greatly limited. Carbon nanotube (CNT) film has excellent electrical conductivity and a unique interconnected network, making it an ideal matrix for composite electrochemical material. We herein report a CNT@nickel silicate composite film (CNT@NiSiO) fabricated by a SiO 2 -mediated hydrothermal conversion process, for sodium storage with excellent electrochemical properties. The obtained composite possesses a cladding structure with homogeneous nanosheets as the outermost and CNT film as the inner network matrix, providing abundant ion diffusion channels, high electronic conductivity, and good mechanical flexibility. Due to these merits, this material possesses an excellent electrochemical performance for sodium storage, including a high specific capacity up to 390 mAh g −1 at 50 mA g −1 , good rate performance up to 205 mAh g −1 at 500 mA g −1 , and excellent cycling stability. On this basis, this work would bring a promising material for various energy storage devices and other emerging applications.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Quanhua Wang,Weijiong Dai,Yi Dai,Meng Pan,Yanchao Liu,Lichen Zhang,Jiajun Zheng,Xuguang Liu,Ruifeng Li,Luoning Ma,Hu Wang,Yuhao Zong
It is well known that low-silica SAPO-34, with an extra porosity (meso- and/or macropores) system, affords excellent catalytic performance in the methanol-to-olefins (MTO) reaction, while the direct synthesis of low-silica SAPO-34 with a hierarchical structure is difficult to achieve, principally because the crystal impurities are usually formed under a low silica content in a gel precursor. Herein, low-silica SAPO-34 nanocrystals were successfully fabricated for the first time by constructing an isomorphous core–shell structure in an epitaxial growth manner. In which, low-silica, ultrasmall nanosquare-shaped SAPO-34 crystals with the same growth orientation along the (100) crystal plane compactly grow on the monocrystal SAPO-34 cores. Crucially, the external surface acid properties of the core SAPO-34 with the Si-rich outer layer are effectively modified by the low-silica SAPO-34 shell. Furthermore, the growth process and Si-substitution mechanism of the shell zeolite were comprehensively investigated. It was found that with the prolonged crystallization time, more and more coordinated Si(4Al) and Si(3Al) structures via two substitution mechanisms (SM2 and SM3) are generated in the nanocrystalline SAPO-34 shell, which endow moderate acidity of the core–shell SAPO-34. Compared to the uncoated SAPO-34, the core–shell SAPO-34 performs a longer lifespan and a higher average selectivity of light olefins (ethylene plus propylene) when applied to the MTO reaction, which is attributed to the positive effects of the luxuriant interstitial pores offering a fast diffusion channel and the moderate acid density depressing the hydrogen transfer reaction of light olefins. This work provides new insights into the fabrication of low-silica SAPO-34 nanocrystals, which are based on the rational design of the isomorphous core–shell zeolite.
研究领域:
化学工程
·
催化材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Qiwei Chen,Zhuo Chen,Yan Wang,Enze Tian,Jinhan Mo
In-situ thermally restorable adsorption films exhibited brilliant performance for indoor volatile organic compounds (VOCs) purification with negligible wind resistance and considerable lifetime. However, the morphology of adsorption films should be restructured for better adsorption kinetics. This study structured adsorption films with submillimeter-sized channels by direct ink writing (DIW). Submicron-micron-sized porous structure was further fabricated through ammonia carbonate treatment. Pore size distribution characterization proved 33% of extra mesopores were created in the hierarchical porous adsorption film. Dynamic adsorption behaviours for formaldehyde and toluene illustrated that the hierarchical porous adsorption film exhibited an over 80% initial one-pass efficiency for both formaldehyde and toluene, improved by 20% over the plane adsorption film. The purification rate was also significantly improved by 83% and 67% for formaldehyde (from 0.059 mg g -1 h −1 to 0.106 mg g -1 h −1 ) and toluene (from 0.143 mg g -1 h −1 to 0.239 mg g -1 h −1 ), respectively. This study proposed a method for conveniently preparing multi-scale porous structured adsorption components under mild conditions. The hierarchical diffusion pathways induced by DIW and ammonium carbonate treatment will enhance the adsorption kinetics and the purification performance of the adsorption film, overcoming the weak purification performance and short material lifetime of the existing indoor VOCs adsorption components. This research can be further applied to gas separation, as well as gas sensing, as DIW can achieve sub-millimeter scale resolution, providing a versatile approach for heat and mass transfer enhancement in chemical and environmental fields.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2019
·
IF 10.159
Huan Liu,Zhuanghe Ren,Xin Zhang,Jianjiang Hu,Mingxia Gao,Hongge Pan,Yongfeng Liu
Conduction with fast Li ion conductivity at room temperature is a major challenge for the development of all solid-state Li-ion batteries. Herein, we demonstrate a novel room-temperature ultrafast Li-ion conductor, lithium borohydride ammonia borane complexes ((LiBH4)x·AB). The incorporation of AB into the LiBH4 structure intrinsically increases the cell volume and decreases the volume density of Li ion, which substantially facilitates the Li-ion conduction. The LiBH4·AB complex delivers up to 4.04 × 10–4 S cm–1 of ion conductivity at 25 °C with nearly negligible electron conductivity. The Li-ion transference number is higher than 0.999 at 40 °C. The room-temperature Li-ion conductivity obtained is largely superior to other LiBH4-based solid-state electrolytes reported previously under identical conditions. Moreover, the ultrafast Li-ion conduction remains stable upon heating and cooling cycling (18–55 °C). Ab initio molecular dynamics simulations display a kind of 1D Li diffusion channel along the b direction in the LiBH4·AB structure, which offers a much lower activation energy barrier (0.12 eV), consequently enabling superior Li-ion conductivity at room temperature.
研究领域:
材料科学
·
电化学
·
能源存储
·
固体离子学
·
无机化学
✓ 已验证
DOI
高影响因子
CARBON
·
2023
·
IF 10.9
Yongjun Zhou,Yuanya Zhang,Jing Wang,Yu He,Junya Yuan,Xuehu Men
Epoxy resin (EP) composites are attracting intensive interest for aviation aircraft applications due to superior machinability and high corrosion resistance . However, the poor tribological performance of EP matrix greatly limits its wide application because of highly brittle and weak thermal properties. Herein, we constructed a vine-like MXene@MoS 2 /Carbon nanofiber aerogel (MMoCA) via directed freezing method and cellulose carbonization treatment. The obtained MMoCA exhibited long-range-aligned 3D porous lamellar structure and the MXene@MoS 2 attached to carbon nanofiber surface presented good dispersion inside the aerogel. Such a novel aerogel bestowed the EP composites with outstanding thermal properties through constructing continuous oriented thermal diffusion channels inside the EP matrix. Meanwhile MMoCA reinforced EP composites (MMoCA-EP) showed great potential in tribological application, resulting from the rapid friction heat dissipation and high-quality transfer films during the friction process . This study has a significant guidance to develop high performance polymer composites in the frontier field of tribology .
研究领域:
材料科学
·
摩擦学
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2022
·
IF 6.206
Junnan Chen,Jinhua Feng,Chengpeng Liang,Li Sun,Zhifeng Lin,Weihua Li,Ming Xue
Searching for nanofillers that have prominent barrier performance, good compatibility with polymer matrix and little chance of triggering galvanic corrosion remains a challenge in organic coating industries. In this study, ZIF nanosheets (ZIF-NS) were readily fabricated at room temperature and then used as additives in epoxy matrix for anticorrosion purpose. EIS demonstrated that epoxy doping with 0.5 wt% ZIF-NS possessed a resistance modulus at 0.01 Hz of 2.88 × 10 9 Ω·cm 2 after immersion for 20 days, which was 2 orders of magnitude higher than that of neat epoxy. Owing to the restrained propagation of coating defects, as well as the tortuous diffusion channels for aggressive ions, ZIF nanosheets have showed great potential to form epoxy-based composite coatings on a large scale, and might pave the way for applications of other two-dimensional MOFs in industries.
研究领域:
材料科学
·
腐蚀工程
·
表面涂层
✓ 已验证
产品关联
DOI
高影响因子
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
·
2024
·Vol. 121
·期 37
·e2409201121
·
IF 9.4
Kang Xiao,Bo-Hao Xiao,Jian-Xi Li,Shunsheng Cao,Zhao-Qing Liu
Transition metal oxides ion diffusion channels have been developed for ammonium-ion batteries (AIBs). However, the influence of microstructural features of diffusion channels on the storage and diffusion behavior of NH4+ is not fully unveiled. In this study, by using MnCo2O4 spinel as a model electrode, the asymmetric ion diffusion channels of MnCo2O4 have been regulated through bond length optimization strategy and investigate the effect of channel size on the diffusion process of NH4+. In addition, the reducing channel size significantly decreases NH4+ adsorption energy, thereby accelerating hydrogen bond formation/fracture kinetics and NH4+ reversible diffusion within 3D asymmetric channels. The optimized MnCo2O4 with oxygen vacancies/carbon nanotubes composite exhibits impressive specific capacity (219.2 mAh g–1 at 0.1 A g–1) and long-cycle stability. The full cell with 3,4,9,10-perylenetetracarboxylic diimide anode demonstrates a remarkable energy density of 52.3 Wh kg–1 and maintains 91.9% capacity after 500 cycles. This finding provides a unique approach for the development of cathode materials in AIBs.
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
ChemistrySelect
·
2023
·Vol. 8
·期 10
·e202203687
·
IF 2.1
Min Zhang,Shenyong Ren,Qiaoxia Guo,Baojian Shen
Graphical Sheet-like zeolite TS-1 was synthesized under hydrothermal conditions by adding seed and urea. Liquid seed and pre-crystallization could adjust thickness of sheet-like sample in b-axis direction. Epoxidation of 1-hexene with H 2 O 2 catalyzed by sheet-like TS-1 gave high selectivity of 1,2-epoxyhexane. In zeolite TS-1, the straight channel parallelled to the b-axis direction has larger pore size and thus is main diffusion channel for molecules. Shorter b-axis brings about shorter diffusion channel, which can leads to higher adsorption and diffusion rate. Therefore, with regard to the morphology modification of MFI zeolites, many studies touch on short b-axis zeolites have been reported. Unfortunately, most of the preparation processes require harsh synthesis conditions and complex organic templates, and they are not conducive to large-scale applications. In this work, cheap organic additive urea and seed crystals were added to synthesize sheet-like TS-1, which boasts short b-axis. At the same time a pre-crystallization was performed at the aging solution stage. In the b-axis direction, the zeolite TS-1 prepared in this way had a minimum thickness of about 50 nm. This is because urea can inhibit the growth of crystals in the b-axis direction, and the guiding effect of the seed liquid also plays the function of adjusting the b-axis thickness. In the epoxidation of 1-hexene with H 2 O 2 when catalyzed by sheet-like TS-1, the selectivity of the target product 1,2-epoxyhexane was significantly improved.
研究领域:
催化
·
材料科学
·
化学工程
✓ 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）