ADVANCED MATERIALS
·
2024
·
IF 27.4
Yuhan Zou,Yuzhu Wu,Wenze Wei,Changpeng Qiao,Miaoyu Lu,Yiwen Su,Wenyi Guo,Xianzhong Yang,Yuqing Song,Meng Tian,Shixue Dou,Zhongfan Liu,Jingyu Sun
The uneven texture evolution of Zn during electrodeposition would adversely impact upon the lifespan of aqueous Zn metal batteries. To address this issue, tremendous endeavors are made to induce Zn(002) orientational deposition employing graphene and its derivatives. Nevertheless, the effect of prototype graphene film over Zn deposition behavior has garnered less attention. Here, it is attempted to solve such a puzzle via utilizing transferred high-quality graphene film with controllable layer numbers in a scalable manner on a Zn foil. The multilayer graphene fails to facilitate a Zn epitaxial deposition, whereas the monolayer film with slight breakages steers a unique pinhole deposition mode. In-depth electrochemical measurements and theoretical simulations discover that the transferred graphene film not only acts as an armor to inhibit side reactions but also serves as a buffer layer to homogenize initial Zn nucleation and decrease Zn migration barrier, accordingly enabling a smooth deposition layer with closely stacked polycrystalline domains. As a result, both assembled symmetric and full cells manage to deliver satisfactory electrochemical performances. This study proposes a concept of “pinhole deposition” to dictate Zn electrodeposition and broadens the horizons of graphene-modified Zn anodes.
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
OPTICS AND LASERS IN ENGINEERING
·
2020
·
IF 4.273
Weicheng Cai,Hui Huang,Zhibo Yang,Ruichen Shang,Xuejing Li,Chi Ma,Jian Zhao,Pengbo Liu,Jian Wang,Wei Wang
For laser-induced fluorescence (LIF), the SNR and related concentration detectability was severely limited by background signal (noise). Herein, an axial-excitation LIF based on pinhole metal-capillary (PMC) and direct laser-diode excitation was proposed. An overall ~480 fold improvement on SNR was realized, because the laser-sidewall interaction ( LSI ) and related background signal (noise) can be effectively suppressed in PMC by avoidance of laser leakage and laser contact with capillary sidewall. For rhodamine B detection without sample enrichment, a detection limit of concentration (DLC) of 0.4 pM was obtained, which is 2.5 fold lower than the DLC (1 pM) of commercial LIFs equipped with bulky and expensive Ar + laser. For selective detection of Cu 2+ , a DLC of 5 pM was realized, which is more than 40 fold lower than that of previous fluorimetry detection with similar quantum-dot probe. The PMC-LIF features compact (16 × 4 × 4 cm 3 ), low-cost and high concentration detectability.
研究领域:
分析化学
·
生物医学工程
✓ 已验证
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2020
·
IF 3.085
Zhou Liu,Shuzhen Wu,Xiaojie Yang,Yijun Zhou,Jiaren Jin,Junmei Sun,Li Zhao,Shimin Wang
SnO 2 has attracted extensive attention in planar perovskite solar cells (PSCs) owing to its outstanding photoelectric properties and low temperature preparation. However, pinholes are easy to appear in the annealing process of SnO 2 films, which limits its application in planar PSCs. Here lists a simple and low-cost method: Urea-complexed tin oxide in deionized water can effectively control the concentration of SnO 2 . This process is conducive to forming a compact surface morphology . Meanwhile, the work explored the effect of the properties of PSCs with different thicknesses of SnO 2 layers. The system analysis showed that PSCs based on 60 nm SnO 2 layer and the methamphetamine lead iodide (MAPbI 3 ) light absorber yielded the highest power conversion efficiency (PCE) over 18%, a fill factor ( FF ) of 0.793, and good stability. Therefore, we believe our study provides an effective way for preparing electron transport layers.
研究领域:
材料科学
·
可再生能源
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太阳能电池
·
光伏技术
✓ 已验证
DOI
高影响因子
Small
·
2023
·Vol. 19
·期 52
·2305357
·
IF 13.3
Yingjun Chai,Chaoyan Jiang,Xudong Hu,Jiguang Han,Yao Wang,Wanqiu Yang,Chongkang Li,Haibo Zeng,Xiaoming Li
Solution-processed organic–inorganic hybrid perovskite polycrystalline thick films have shown great potential in X-ray detection. However, the preparation of compact perovskite thick films with large area is still challenging due to the limitation of feasible ink formulation and pinholes caused by solvent volatilization. Post-treatment and hot-pressing are usually involved to improve the film quality, which is however unsuitable for subsequent integration. In this work, a homogeneous bridging strategy is developed to prepare compact perovskite films directly. A stable perovskite slurry with suitable viscosity consisting of undissolved grains and supersaturated solution is formed by adding a weak coordination solvent to the pre-synthesized microcrystalline powders. Small perovskite grains in situ grow from the saturated solution during the annealing, filling the pinholes and connecting the surrounding original grains. As a result, large-area perovskite thick film with tight grain arrangement and ultralow current drift is blade-coated to achieve X-ray imaging. The optimal device displays an impressive mobility-lifetime product of 2.2 × 10 −3 cm 2 V −1 and a champion ratio of sensitivity to the dark current density of 2.23 × 10 11 µC Gy air −1 A −1 . This work provides a simple and effective route to prepare high-quality perovskite thick films, which is instructive for the development of perovskite-based X-ray flat-panel detectors.
研究领域:
材料科学
·
纳米技术
·
半导体器件
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X射线检测
·
薄膜加工
✓ 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）