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水系锌二次电池凭借其安全性高、环境友好、成本低廉、能量密度较高等诸多优势,有望应用于下一代大规模储能系统。电池的发展依赖于电极材料,二氧化锰由于其高丰度、低成本、毒性小等优势,在水系锌二次电池领域得到广泛应用。本文将从二氧化锰的晶体结构、反应机理及电化学性能出发,对其在水系锌二次电池中的研究进展进行系统综述。特别地,针对其容量低、循环稳定性差等问题,本文从储能机理(包括嵌入-脱嵌机制和溶解-沉积机制)角度出发,总结相对应的优化策略,为先进水系锌锰二次电池的设计开发提供参考。 相似文献
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Effect of vacancy defect clusters on the optical property of the aluminium filter used for the space solar telescope 下载免费PDF全文
We investigate the microstructures of the pure aluminium foil
and filter used on the space solar telescope, irradiated by photons
with different doses. The vacancy defect clusters induced by proton
irradiation in both samples are characterized by transmission
electron microscopy, and the density and the size distribution of
vacancy defect clusters are determined. Their transmittances are
measured before and after irradiating the samples by protons
with energy E=100~keV and dose φ =6× 1011/mm2.
Our experimental results show that the density and the size of
vacancy defect clusters increase with the increase of irradiation
doses in the irradiated pure aluminium foils. As irradiation dose
increases, vacancies incline to form larger defect clusters. In the
irradiated filter, a large number of banded void defects are
observed at the agglomerate boundary, which results in the
degradation of the optical and mechanical performances of the
filter after proton irradiation. 相似文献
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本文分别采用Gaussian98程序的密度泛函B3LYP方法和Gamess程序的CAS-MCSCF方法,研究了EuC分子的结构问题.两种方法均得到了12重态是EuC分子的基态的结论.基于B3LYP方法,得到12∑+态的LUMO和HOMO能量差达到3.689 eV,明显的高于其他多重度的结果.基于MCSCF方法的结果显示,需要进一步的考虑相对论效应修正以及增大活性空间的尺寸将会得到对高自旋电子态更为可靠的结论. 相似文献
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B3LYP level density functional theory (DFT) and multiconfiguration self-consistent-field (MCSCF) level ab initio method calculations have been performed on the basis of relativistic effective core potentials to investigate the nature of EuC and EuC2 molecules. The computed results indicate that the ground states of EuC and EuC2 are ^12∑^+ and SA2, respectively. Dissociation potential energy curves of the low-lying electronic states of EuC have been calculated using the MCSCF method, and the same level calculation on EuC2 indicates that the dissociation energy of EuC2 of ground state compares well with the available experimental data. The bond characteristic is also discussed using Mulliken populations. 相似文献
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为了检验应用在极紫外波段空间太阳望远镜上Al滤光片在空间辐照环境下透过率的变化情况,用能量100 keV,剂量为6×1011/mm2的质子束对其进行辐照,利用透射电子显微镜分析了质子辐照前后滤光片的微观结构。实验结果表明:由于质子辐照使滤光片受质子侵蚀后,Al原子被击出发生质量损失,表面形态发生了变化,造成滤光片变薄,从而导致透过率由辐照前的12.1%增大到15.0%,且滤光片的薄厚分布不均匀使透过率曲线出现了次级峰,造成其光学性能的退化。 相似文献
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建立了高效液相色谱(HPLC)与共振瑞利散射(RRS)联用检测人体尿液中法莫替丁(FMTD)和雷尼替丁(RNTD)的方法。柱前分离系统以乙腈与醋酸-醋酸钠缓冲溶液(pH 4.5)为流动相等度洗脱,流速为0.5 mL/min,进样量为20 μL,柱温为35 ℃,使用Kinetex 5 μm C18液相色谱柱(250 mm × 4.60 mm);柱后衍生系统以赤藓红与金属离子Pd(Ⅱ)同时作为探针,探究了柱后衍生的最佳实验条件。结果显示,法莫替丁与雷尼替丁分别在0.024~25 μg/mL和0.033~25 μg/mL质量浓度范围内线性良好,相关系数(r)分别为0.999 0和0.998 8,检出限(S/N>3)分别为7.3、10.1 ng/mL。采用该方法对已知混合浓度的样品进行测定,加标回收率为97.8%~102%,相对标准偏差(RSD)均不大于5.1%。该方法的可靠性和实用性良好,可用于人体尿液中法莫替丁和雷尼替丁的检测。 相似文献
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