Small Methods
·
2025
·
IF 9.1
Yunhui Lin,Fang Lin,Ming Zhang,Xingxing Jiao,Panpan Dong,Weiqing Yang
Commercial 3D zinc foam anodes with high deposition space and ion permeation have shown great potential in aqueous ion batteries. However, the local accumulated stress from its high-curvature surface exacerbates the Zn dendrite issue, leading to poor reversibility. Herein, we have employed zincophilic N-doped carbon @ Sn composites (N-C@Sn) as nano-fillings to effectively release the local stress of high curvature surface of 3D Zn foams toward dendrite-free anode in aqueous zinc ion battery (AZIB). These electronegative and conductive N-C@Sn nano-fillings as supporters can provide a highly zincophilic channel for initial Zn nucleation and reduce local current density for regulating Zn deposition. Uniform Zn deposition further assists homogenous stress distribution on the platting surface, which gives a positive feedback loop to improve anode reversibility. As a result, zinc foam with N-C@Sn composite (ZCSn Foam) symmetric cell achieves a long cycle lifespan of 1100h at 0.5 mA cm −2 , much more than that of Zn Foam (∼80 h lifespan). The full cell ZCSn Foam||MnO 2 exhibits remarkable reversibility with 67% retention after 1000 cycles at 0.8 A g −1 and 76% after 1600 cycles at 2 Ag −1 . This 3D-constructing strategy may offer a promising and practical pathway for metal anode application.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Fundamental Research
·
2024
·
IF 5.7
Haoyang Fu,Qingze Chen,Benzhi Min,Shuzhou Li,Xiaodong Chen,Lan Ling
Probing the molecular-level redox behavior and mechanism of oxides is essential to developing innovative applications in different fields such as catalysis, but remains a challenge for the scientific community. Using in-situ transmission electron microscopy, here we provide an overall reduction view of single-crystalline α-Fe 2 O 3 with different characteristics from the conventional wisdom of oxide reduction. Specifically, the formation of epitaxial nanoislands with concomitant oscillatory phase transitions (α-Fe 2 O 3 →defective γ-Fe 2 O 3 →α-Fe 2 O 3 ) at the subsurface is observed during reduction. The dynamic equilibrium of lattice oxygen at the surface and the limited oxygen replenishment from the deep layer drive the α-Fe 2 O 3 →defective γ-Fe 2 O 3 transformation in the subsurface, while the polymorphic transition (defective γ-Fe 2 O 3 →α-Fe 2 O 3 ) spontaneously occurs under heating conditions. Such oscillatory phase transition is accompanied by the release of asymmetric stress, inducing the extension of epitaxial nanoislands. Our work highlights the complexity of reduction by providing an integral picture of oxide reduction, which contributes to the understanding of the site evolution of oxide-based catalysts in their working state.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Extreme Mechanics Letters
·
2024
·
IF 4.3
Xi Chen,Jiayi Lin,Hang Yang,Jingda Tang
Dynamic covalent bonds endow polymers with unique mechanical properties, such as tunable viscoelastic response and self-healing capability. The study on the fracture of dynamic polymers has recently initiated. However, it is still elusive how dynamic covalent bonds affect the flaw sensitivity of dynamic polymers. Here, we prepare the polyacrylamide hydrogel with dynamic disulfide bonds as the model material. Under UV irradiation, dynamic bond exchange reaction effectively releases the stress concentrated at the crack tip, making the hydrogel less flaw sensitive. Notably, both the rupture stretch and rupture stress of dynamic hydrogels under UV irradiation are much higher than the control group. We further investigate the effect of photoinitiator concentration and dynamic bond content on the flaw sensitivity of dynamic hydrogels. The increase of photoinitiator concentration or dynamic bond content intensifies the dynamic bond exchange reaction, causing more stress relaxation and improved flaw insensitivity of the hydrogel. Moreover, we exploit this flaw insensitivity to tune the crack propagation path in dynamic hydrogel with double edge cracks. The crack propagates in the non-irradiated area, but is retarded in the irradiated area to show asymmetric fracture mode. We hope this work can provide new insights for the design of polymers with dynamic covalent bonds.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Hui Gu,Zhenpeng Zhu,Zhiyuan Gao,Junhao Zhang,Xingmei Guo,Yuanjun Liu,Xiangjun Zheng,Qianqian Fan,Zhongyao Duan,Fu Cao,Chunsheng Li,Qinghong Kong
To deal with the low conductivity and structural instability of the silicon (Si)-based anode, a Ge–Si/C nanofiber (Ge–Si/CNF) composite is fabricated based on different starting reaction potentials for Si and Ge with lithium and excellent conductivity of Ge. Sucrose is innovatively introduced as a spinning aid to maintain the carbon fiber structure derived from poly(vinyl alcohol) as the spinning polymer. When Ge–Si/CNFs are investigated as the anode material for lithium-ion batteries, it demonstrates excellent cyclic stability and rate capability. Specifically, the Ge–Si/CNFs anode can still retain 764.1 mA h g–1 at 0.5 A g–1 after 1000 cycles, and its capacity retention rate reaches 72.1%. Significantly, the specific capacity is 1168.7 mA h g–1 at 2.0 A g–1, which is restored to 1731.4 mA h g–1 when it is adjusted back to 0.1 A g–1. The excellent lithium storage of Ge–Si/CNF anode is attributed to the effective release of stress during the lithiation/delithiation process because of the different starting potentials of Si and Ge. When one component is lithiated, the other one can act as a buffer matrix for improving the structural stability. Additionally, the addition of Ge and carbon fibers can speed up the transfer rate of Li+ and electrons.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2024
·
IF 4.1
Ge Zhao,Kangning Wu,Zhuolin Zhang,Dongxu An,Xu Zhang,Li Ran,Fusheng Zhou,Jianying Li
It has been a challenge to improve the performance of epoxy insulation in the whole life cycle by achieving the reduction of residual stress during manufacturing, the healing of damages during application, and the recycling after decommissioning. In this paper, a novel recyclable epoxy resin (SEP) with releasable residual stress and synergistically enhanced dielectric properties and healing ability was successfully developed by introducing dynamic thiocarbamate bonds (DTBs). A reduction in residual stresses by 45 % was detected after SEP was annealed at 30 °C below the glassy transition temperature ( T g ) for 8 h, during which the mechanical properties remained unchanged. Synergistically improved dielectric properties and damage-healing ability were also observed in SEP. A high healing efficiency of 94.4 % for electrical breakdown damage was found in SEP, meanwhile its dielectric properties were superior to commercial epoxy resin. Additionally, SEP featured good recyclability, including reprocessability and degradability. All those excellent properties were ascribed to the dissociation and recombination of DTBs triggered by thermal stimulation. This work provides an effective solution to a series of issues throughout the full lifecycle of epoxy materials.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
RARE METALS
·
2023
·Vol. 43
·期 3
·1017-1029
·
IF 8.8
Han Xiang,Xu Min,Gu Lan-Hui,Lan Chao-Fei,Chen Min-Feng,Lu Jun-Jie,Sheng Bi-Fu,Wang Peng,Chen Song-Yan,Chen Ji-Zhang
Silicon has ultrahigh capacity, dendrite-free alloy lithiation mechanism and low cost and has been regarded as a promising anode candidate for solid-state battery. Owing to the low infiltration of solid-state electrolyte (SSE), not the unstable solid–electrolyte interphase (SEI), but the huge stress during lithiation- and delithiation-induced particle fracture and conductivity lost tend to be the main issues. In this study, starting with micron-Si, a novel monothetic carbon conductive framework and a MgO coating layer are designed, which serve as electron pathway across the whole electrode and stress releasing layer, respectively. In addition, the in situ reaction between Si and SSE helps to form a LiF-rich and mechanically stable SEI layer. As a result, the mechanical stability and charge transfer kinetics of the uniquely designed Si anode are significantly improved. Consequently, high initial Coulombic efficiency, high capacity and durable cycling stability can be achieved by applying the Si@MgO@C anode in SSB. For example, high specific capacity of 3224.6 mAh·g −1 and long cycling durability of 200 cycles are achieved. This work provides a new concept for designing alloy-type anode that combines surface coating on particle and electrode structure design. Graphical abstract
研究领域:
材料科学
·
电化学
·
能源存储
·
固态离子学
·
纳米材料
·
电池技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Huan Bi,Baibai Liu,Dongmei He,Le Bai,Wenqi Wang,Zhigang Zang,Jiangzhao Chen
Interfacial defect and residual stress hinder the further enhancement of power conversion efficiency (PCE) and stability of perovskite solar cells (PSCs). Here, we report a multifunctional interface modification strategy where KPF 6 molecule is employed to modify SnO 2 /perovskite interface. It is revealed that PF 6 − is still located at interface whereas most of K + ions diffuse into perovskite layer. PF 6 − can chemically link SnO 2 layer and perovskite layer via the hydrogen bond with perovskites and coordination bond with SnO 2 , resulting in improved interfacial contact. KPF 6 interface modification leads to improved perovskite film quality, interfacial defect passivation, and interfacial stress release. As a result, the KPF 6 -modified device achieves an efficiency enhancement from 19.66% to 21.39% as compared to the control device. Meanwhile, moisture, thermal and light stability are ameliorated after interface modification. The unencapsulated KPF 6 -modified device maintains 80.1% of its initial PCE after aging for 960 h at 60 °C and 57.2% after aging for 960 h under one sun illumination, respectively. This work provides an idea for developing multifunctional interface molecules toward simultaneously enhancing efficiency and stability of PSCs.
研究领域:
材料科学
·
能源科学
·
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）