Bi是对CO 2电化学还原成甲酸盐的有吸引力的催化剂。在这项工作中,通过用酒石酸 (TA) 溶液对Mg 3 Bi 2进行脱合金制备纳米多孔铋,并根据 TA 的浓度调整初级 Bi 纳米粒子的尺寸。当 TA 的浓度从 2 wt% 增加到 20 wt% 时,Bi 的粒径从约 70 nm 增加到 400 nm。合成的纳米多孔 Bi 样品作为电催化剂用于还原KHCO 3 中的 CO 2电解质,发现粒径越小,催化活性越高。然而,包含 70 nm 颗粒的纳米多孔 Bi 在反应过程中遇到传质困难和烧结,而 100 nm 纳米多孔 Bi 提供高甲酸盐形成电流和法拉第效率(FE)(16 mA cm -2,FE > 90% at -0.88 V vs. RHE)并显示出优异的耐久性。
reversible alloying reaction, whereas antimony displays no electrochemical activity. Taking advantage of the complete SbBi solidsolution, monophasic compositions Sb1-xBix were prepared by high-energy mechanochemical synthesis and characterized by X-ray diffraction and solid-state 25Mg nuclear magnetic resonance spectroscopy. The electrochemical magnesiation at low current rate shows a full alloying process
尽管锑和铋之间在物理和化学上有很强的相似性,但在其微米级粉末的电化学放大倍数中观察到了明显的行为。铋经历了完全且高度可逆的合金化反应,而锑则没有电化学活性。利用完整的Sb Bi固溶体,通过高能机械化学合成制备单相组合物Sb 1-x Bi x,并通过X射线衍射和固态25 Mg核磁共振波谱进行表征。低电流速率下的电化学放大显示了Sb 1-x Bi x基电极的完整合金化过程,导致单相Mg 3(Sb 1-x Bi x)2。锑和铋的这种化学缔合可对电极的电化学放大产生积极影响,并且与Bi基电极相比,可实现更高的比容量。然而,这种协同作用仅在标称放电中起作用,因为在随后的充电中观察到不可逆的容量损失,该容量损失与锑含量成比例。Operando XRD显示了一个复杂的偏析过程,导致在装料结束时产生纯铋和Mg 3 Sb 2,这通过密度泛函理论计算进一步合理化为Mg 3(Sb 1-x Bi x)的不稳定性2固溶体。
Insights into the electrochemical performances of Bi anodes for Mg ion batteries using <sup>25</sup>Mg solid state NMR spectroscopy
作者:Zigeng Liu、Jeongjae Lee、Guolei Xiang、Hugh F. J. Glass、Evan N. Keyzer、Siân E. Dutton、Clare P. Grey
DOI:10.1039/c6cc08430c
日期:——
The relationship between fast Mg-ion dynamics and excellent electrochemical performance of Bi anode for MIB is illustrated by NMR technique.
利用核磁共振技术阐明了Bi负极快速Mg离子动力学与优异电化学性能之间的关系。
The electronic and structural properties of liquid Mg - Bi near the stoichiometric composition
作者:C Guo、A C Barnes、W S Howells
DOI:10.1088/0953-8984/8/50/009
日期:1996.12.9
The structure and electronicproperties of liquid alloys with compositions close to the stoichiometriccomposition have been measured. The extremely deep minimum in the electronic conductivity observed previously at this composition is confirmed and shows a minimum value of which is characteristic of a good liquid semiconductor. In contrast, the thermopower of the samples never exceeds for all the
Fast-ion conduction and the structure of beta -Mg<sub>3</sub>Bi<sub>2</sub>
作者:A C Barnes、C Guo、W S Howells
DOI:10.1088/0953-8984/6/32/002
日期:1994.8.8
The structure of beta-Mg3Bi2 has been determined by neutron powder diffraction. The results show this is a superionic phase, with a fixed body-centred cubic bismuth sub-lattice and mobile Mg2+ ions. From analysis of the radial distribution function obtained from the diffraction pattern, it is concluded that the magnesium ions occupy the tetrahedral and triangular symmetry sites of the bismuth lattice