相关实验视频

Updated: Aug 9, 2026

In situ FTIR Spectroscopy as a Tool for Investigation of Gas/Solid Interaction: Water-Enhanced CO2 Adsorption in UiO-66 Metal-Organic Framework

In situ FTIR Spectroscopy as a Tool for Investigation of Gas/Solid Interaction: Water-Enhanced CO2 Adsorption in UiO-66 Metal-Organic Framework

Published on: February 1, 2020

在现场表面重建基于Co的伊米达二氧化物框架的Mo蚀刻,用于更高的水氧化

Jinke Shen¹, Gege He¹, Hongyu Mi¹

¹School of Chemical Engineering and Technology, Xinjiang University, Urumqi 830017, Xinjiang, China.

Journal of colloid and interface science

|September 16, 2024

概括

泽奥利特化伊米达酸框架 (ZIFs) 被转化为空洞的CoMo纳米,用于增强氧化演化反应 (OER) 催化. 工程材料表现出卓越的活性和稳定性,为催化剂设计提供了洞察力.

科学领域:

材料科学材料科学材料科学
电化学电化学电化学
纳米技术纳米技术

背景情况:

氧化伊米达酸框架 (ZIF) 提供可调节的多孔性,但在直接催化应用中面临挑战.
开发高效,稳定的氧化演化反应 (OER) 电催化剂对于能源技术至关重要.
金属有机框架 (MOF) 为设计先进的催化材料提供了一个多功能平台.

研究的目的:

从ZIF-67制造新的基于CoMo的3D空心纳米,以提高OER性能.
调查Mo出水和表面重建在产生活跃的CoOOH遗址中的作用.
为了阐明结构-组成-活性关系,以增强OER动力学.

主要方法:

使用MoO4^2-在ZIF-67的现场蚀刻,以形成基于CoMo的空心纳米.
X射线光电子光谱 (XPS) 和现场拉曼光谱用于表面特征.
在1M KOH中进行电化学测试,以评估氧演化反应 (OER) 的性能.
密度函数理论 (DFT) 计算以了解反应机制.

主要成果:

由纳米片组成的相互连接的3D空心纳米的制造.
证实了Mo水和表面重建产生了活跃的CoOOH站点.
经过工程设计的CoMo-30实现了低OER超电位 (280 mV在30 mA cm^-2) 和高稳定性 (>110 h).
性能明显超过了控制材料和商业RuO2.
在 CoMo-30 上,DFT 的计算为*O -> *OOH 步骤确定了较低的自由能量.

结论:

来自MOFs的空心纳米结构的合理设计对催化是有效的.
表面重建和CoOOH网站是提高OER活动和稳定的关键.
开发的基于CoMo的纳米代表了氧气进化反应的有希望的电催化剂.

关键词:

基于 CoMo 的催化剂.空洞的纳米子是空洞的.金属有机框架结构氧的演化反应反应的反应.表面重建的重建.

更多相关视频

Resource Recycling of Red Soil to Synthesize Fe2O3/FAU-type Zeolite Composite Material for Heavy Metal Removal

Resource Recycling of Red Soil to Synthesize Fe2O3/FAU-type Zeolite Composite Material for Heavy Metal Removal

Published on: June 2, 2022

Author Spotlight: Functionalizing Metal-Organic Frameworks: Advancements, Challenges, and the Power of Post-Synthetic Ligand Exchange

Author Spotlight: Functionalizing Metal-Organic Frameworks: Advancements, Challenges, and the Power of Post-Synthetic Ligand Exchange

Published on: June 23, 2023

相关概念视频

Coagulation

Coagulation

Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...

Sulfate Attack on Concrete

Sulfate Attack on Concrete

Sulfate attack on concrete is a deterioration process characterized by a whitish discoloration beginning at the edges and corners, accompanied by cracking and spalling. This phenomenon occurs when sulfates react with the components of hardened concrete, forming compounds like calcium sulfate and calcium sulfoaluminate which occupy more space than the substances they replace, causing the concrete to expand and disrupt.
Sulfates from sources like soil, groundwater, or industrial effluents...

Corrosion of Reinforcement

Corrosion of Reinforcement

The corrosion of steel reinforcement within concrete is a process influenced by the material's inherent properties and external factors. The high pH level of around 13, provided by calcium hydroxide present in concrete, initially protects the steel reinforcement by promoting the formation of a passive iron oxide layer on its surface.
However, over time and under certain conditions like carbonation, chloride ingress, and cracking this protective state can be compromised. Steel has areas with...