Template-free synthesis of multiple-shell MgO/Pt hollow spheres as enhanced electrocatalysts
作者:Tao Wang、Weihao Cui、Meiling Peng、Shenshen Ouyang、Sheng Wang
DOI:10.1039/c6ta03070j
日期:——
In general, most carbon-based hollowspheres with porous structures are prepared using the so-called hard-template method. In this paper, we present a template-free strategy for the fabrication of multiple-shell MgO/Pt hollowspheres. The as-prepared MgO/Pt spheres have a highly porous and self-supporting structure with a high surface area of 16.7 m2 g−1. Moreover, our research indicates that the as-prepared
通常,大多数具有多孔结构的碳基空心球是使用所谓的硬模板法制备的。在本文中,我们提出了无模板的多壳MgO / Pt空心球制造策略。所制备的MgO / Pt球具有高度多孔的自支撑结构,具有16.7 m 2 g -1的高表面积。此外,我们的研究表明,所制备的多壳MgO / Pt空心球表现出增强的电催化活性和对甲醇氧化反应的长期稳定性。
In Situ Infrared Spectroscopic Study of Brucite Carbonation in Dry to Water-Saturated Supercritical Carbon Dioxide
作者:John S. Loring、Christopher J. Thompson、Changyong Zhang、Zheming Wang、Herbert T. Schaef、Kevin M. Rosso
DOI:10.1021/jp210020t
日期:2012.5.17
geologic carbon sequestration, whereas part of the injected carbondioxide will dissolve into host brine, some will remain as neat to water saturated supercritical CO2 (scCO2) near the well bore and at the caprock, especially in the short term life cycle of the sequestration site. Little is known about the reactivity of minerals with scCO2 containing variable concentrations of water. In this study, we used
Controlled rate thermal analysis of hydromagnesite
作者:Veronika Vágvölgyi、R. L. Frost、M. Hales、A. Locke、J. Kristóf、Erzsébet Horváth
DOI:10.1007/s10973-007-8845-6
日期:2008.6
The reaction of magnesium minerals such as brucite with CO2 is important in the sequestration of CO2. The study of the thermal stability of hydromagnesite and diagenetically related compounds is of fundamental importance to this sequestration. The understanding of the thermal stability of magnesium carbonates and the relative metastability of hydrous carbonates including hydromagnesite, artinite, nesquehonite, barringtonite and lansfordite is extremely important to the sequestration process for the removal of atmospheric CO2. This work makes a comparison of the dynamic and controlled rate thermal analysis of hydromagnesite and nesquehonite. The dynamic thermal analysis of synthetic hydromagnesite proves that dehydration takes place in two steps at 135 and 184°C, dehydroxylation at 412°C and decarbonation at 474°C. Controlled rate thermal analysis shows the first dehydration step is isothermal and the second quasi-isothermal at 108 and 145°C, respectively. In the CRTA experiment both water and carbon dioxide are evolved in an isothermal decomposition at 376°C. CRTA technology offers better resolution and a more detailed interpretation of the decomposition processes of magnesium carbonates such as nesquehonite via approaching equilibrium conditions of decomposition through the elimination of the slow transfer of heat to the sample as a controlling parameter on the process of decomposition. Constant-rate decomposition processes of non-isothermal nature reveal partial nesquehonite structure.
水镁石等镁矿物与 CO2 的反应对于 CO2 的封存非常重要。水菱镁矿和成岩相关化合物的热稳定性研究对于这种封存至关重要。了解碳酸镁的热稳定性和水合碳酸盐(包括水菱镁矿、霰石、三水菱镁矿、三棱柱石和菱镁矿)的相对亚稳定性对于去除大气二氧化碳的封存过程极其重要。这项工作对水菱镁矿和三水菱镁矿的动态和控制速率热分析进行了比较。合成水菱镁矿的动态热分析证明脱水在135℃和184℃下分两步发生,即在412℃下脱羟基和在474℃下脱碳。受控速率热分析显示,第一个脱水步骤是等温的,第二个脱水步骤分别在 108°C 和 145°C 下准等温。在 CRTA 实验中,水和二氧化碳在 376°C 的等温分解中产生。 CRTA 技术通过消除向样品缓慢传递热量作为分解过程的控制参数,接近分解平衡条件,从而为碳酸镁(如三水镁石)的分解过程提供更好的分辨率和更详细的解释。非等温性质的恒速分解过程揭示了部分三水锰矿结构。
Synthesis, electron microscopy and X-ray characterization of oxymagnesite, MgO·2MgCO<sub>3</sub>, formed from amorphous magnesium carbonate
The first electron microscopy images of the peculiar oxymagnesite crystal are presented along with the synthesis description and crystallographic data.
这是一段科技文献的句子,翻译如下:
首次展示了奇特的氧化镁镁石晶体的电子显微镜图像,并提供了合成描述和晶体学数据。
An Efficient Halogen-Free Electrolyte for Use in Rechargeable Magnesium Batteries
作者:Oscar Tutusaus、Rana Mohtadi、Timothy S. Arthur、Fuminori Mizuno、Emily G. Nelson、Yulia V. Sevryugina
DOI:10.1002/anie.201412202
日期:2015.6.26
simple‐type Mg salt that is compatible with Mg metal and displays an oxidative stability surpassing that of ether solvents. Owing to its inertness and non‐corrosive nature, the Mg(CB11H12)2/tetraglyme (MMC/G4) electrolyte system permits standardized methods of high‐voltage cathode testing that uses a typical coin cell. This achievement is a turning point in the research and development of Mg electrolytes