C‐oriented and {010} Facets Exposed BiVO4 Nanowall Films: Template‐Free Fabrication and their Enhanced Photoelectrochemical Properties

Vertically aligned BiVO₄ nanowall films on indium tin oxide (ITO) glass have been fabricated through a template‐free hydrothermal method for the first time. Based on the structural understanding of both BiVO₄ and ITO, the lattice matches ({020}_BiVO4 and {040}_ITO, {200}_BiVO4 and {004}_ITO, respectively) and the similarity of metal atomic arrangement parallel to {001} planes turn out to be crucial for the fabrication of the nanowalls. Consequently, the growth of a BiVO₄ film begins from heteroepitaxy and undergoes an Ostwald ripening process to form an extended network, resulting in a c‐orientation and exposing {010} facets. Through this process, it is much easier to obtain a range of nanowall films with different packing densities, as the surface state of ITO glass is alterable by adjusting the concentration of acid. The films can be directly used as an electrode, which exhibits an excellent response to visible light, especially light with low intensity, allowing for the electrical interconnection, highly active surface, appropriate orientation, and a good contact with the substrate. There are great benefits in improving the technique for detecting the weak light source signals.     

正极添加Na2WO4对镍氢电池高温性能的影响

研究了添加不同比例的Na2WO4对镍正极高温性能的影响, 结果表明, Na2WO4可提高镍氢电池的高温充电效率. 70 ℃条件下, 添加1.0%(w)的Na2WO4时镍正极的充电效率达到85%以上. 此外, Na2WO4的加入也可提高镍氢电池的放电容量、循环寿命和荷电保持率. 研究表明: Na2WO4可以促进镍正极高温下充电正反应的进行, 提高析氧过电位.     

Diagram of phase equilibria in the Fe2V4O13-WO3 system

A diagram for the phase equilibria established in the two-component Fe₂V₄O₁₃-WO₃ system (one of the intersections of the Fe₂O₃-V₂O₅-WO₃ three-component system) has been constructed based on the measurements made by DTA and X-ray phase analysis. The diagram shows that the system investigated does not appear to be a true two-component system, even below the solidus line.     

Theoretical examination of substituent effects on the stabilization of a Sn?Y (Y = Sb and Bi) multiple bond

The potential energy surface for the unimolecular rearrangement XSn?Y → TS → Sn?YX (Y = Sb, Bi) was investigated using the B3LYP and QCISD methods. To explore electronic effects on the relative stability of XSn?Y and Sn?YX, the first‐row substituents (X = H, Li, BeH, BH₂, CH₃, NH₂, OH, F) have been used. Our theoretical findings suggest that the doubly bonded Sn?YX species are always both kinetically and thermodynamically more stable than their corresponding triply bonded isomers, XSn?Y, regardless of the electronegativity of the substituent X. Nevertheless, our model calculations indicate that an aryl group can, if sufficiently bulky, stabilize triply bonded XSn?Y molecules with respect to both isomerization and polymerization. That is to say, it is not electronic but steric effects that play a dominant role in stabilizing both Sn?Sb and Sn?Bi triple bonds. © 2004 Wiley Periodicals, Inc. Int J Quantum Chem, 2005     

Composition dependence of oxide anion conduction in the BIMEVOX family

Partial substitution for vanadium in Bi₄V₂O₁₁ can lead to the stabilization at room temperature of one of the three polymorphs , β, γ exhibited by the mother compound. A tentative classification of the BIMEVOX phases based on these structural polytypes is carried out, and a review of the different identified ways to stabilize the γ-type phases, the most performant ones in term of oxide anion conduction, is proposed. The experimental results clearly indicate that the predominant parameter is not the size or the valence state of the dopant, but rather the structural parameter correlated with the ability for the dopant to regularize the diffusion slab between the Bi₂O₂ sheets in these layered materials.     

纳米级MnO2的制备与电化学性质研究（II）溶胶凝胶法制备掺铋改性纳米...

用溶胶凝胶法制得掺铋二氧化锰。经ＸＲＤ、ＴＥＭ、ＩＣＰ、化学分析等测定，确定了所得样品的主要晶型为α－ＭｎＯ２，所掺铋的晶态为Ｂｉ２Ｏ３，为纳米级颗粒（记为ｎｍ－Ｂｉ－ＣＭＤ）。用它与掺铋电解二氧化锰（记为Ｃｉ－ＥＭＤ）以最佳配比混合，可大大提高充放电容量。通过循环伏安、交流电导率、交流电阻等测试所测得的电导率、电极表面的分形维数，初步解释了充入电性能改善的原因主要是由于提高了最佳配比样品的导电率     

无机过氧化物的研究——Ⅲ.钨酸希土磷光体的均相合成

本文报道不用常规固相反应而自溶液中均相制备低聚态钨酸希土磷光体的方法,可能为磷光体的应用提供基础。     

铋配合物[Bi(S_2CNC_5H_(10))_2(NO_3)]·[1,10-Phen]·0.5H_2O的合成及晶体结构

由于铋的无毒性、不致癌性以及铋配合物的特殊生物活性,使得铋配合物的研究受到人们的重视。氨荒酸盐及其衍生物是一类有效杀菌剂,已作为植物叶面杀菌剂较广泛地应用,而邻菲咯啉又是一种抑菌剂。把这几类具有生物活性的原料合为一体,应得到具有高生物活性的铋配合物,近期人们的     

共沉淀分离富集—ICP-AES法测定高纯钨酸钠中痕量铍钪镱锌

以Ｌａ（ＯＨ）３为共沉淀剂，使高纯Ｎａ２ＷＯ４中痕量Ｂｅ，Ｓｃ，Ｙｂ，Ｚｎ与基体相分离并富集，然后用ＩＣＰ－ＡＥＳ法测定，实验表明，发ＰＨ为１２时，用６ｍＬ％１％Ｌａ溶液进行两次共沉淀淀分离能使上述元素定量分离回收，回收率为９２．７％－１０２．５％，相对标准偏差为２．８－５．９％。