相关实验视频
Updated: Sep 13, 2025

10:00
Hydrogen Production and Utilization in a Membrane Reactor
Published on: March 10, 2023
2.6K
异面接口定与局部强轨道合,用于持久的质子交换膜水电解
Jing Ni1,2, Zhaoping Shi1,2, Jingsen Bai1,2
1Laboratory of Advanced Power Sources, State Key Laboratory of Electroanalytic Chemistry, Jilin Province Key Laboratory of Low Carbon Chemistry Power Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, 130022, P.R. China.
Angewandte Chemie (International ed. in English)
|July 25, 2025
概括
研究人员开发了一种通过工程接口在质子交换膜水电解 (PEMWE) 中稳定 (Ir) 的新方法. 这种方法显著提高了催化剂的稳定性和活性,这对经济至关重要.
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
- 催化剂是一种催化剂.
背景情况:
- 尽量减少 (Ir) 的使用对于具有成本效益的质子交换膜水电解 (PEMWE) 来说至关重要.
- 在恶劣的PEMWE条件下,的活性点由于弱的Ir支结合而变得不稳定.
- 开发稳定和活跃的电催化剂对于推进经济至关重要.
研究的目的:
- 通过异质接口工程稳定PEMWE中的活性点.
- 为了提高水电解的基电催化剂的活性和耐用性.
- 建立支持电催化剂的一般设计策略.
主要方法:
- 构建了一种Nb-TiO2 鲁/亚纳异相同结,以稳定 Ir 位点.
- 使用操作特征和理论计算来验证稳定机制.
- 合成的Ir@IrOx/m-Nb-TiO2阳极用于PEMWE测试.
主要成果:
- 通过增强轨道重叠和电荷转移,实现了Ir站点的原子尺度定.
- 加强了Ir-支持的结合,并优化了*OOH吸附能量.
- 证明了PEMWE在超低Ir负载 (0.27 mgIr cm-2) 时在1.72V的2A cm-2.2的特殊性能.
- 展现出前所未有的耐用性,在3000小时内电压衰减<1.7%.
结论:
- 异构接口工程有效地稳定了PEMWE中的活性位点.
- 开发的Nb-TiO2支持的Ir催化剂提供了高活性和显著的稳定性.
- 这种接口设计为水电解和以后的下一代电催化剂提供了多功能范式.
相关概念视频
Interfacial Electrochemical Methods: Overview
391
Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
391
Intermolecular Forces
61.2K
Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
61.2K
Ion Exchange
663
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
663
Potentiometry: Membrane Electrodes
794
Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
794
Chemiosmosis
102.3K
Oxidative phosphorylation is a highly efficient process that generates large amounts of adenosine triphosphate (ATP), the basic unit of energy that drives many cellular processes. Oxidative phosphorylation involves two processes— the electron transport chain and chemiosmosis.
Electron Transport Chain
The electron transport chain involves a series of protein complexes on the inner mitochondrial membrane that undergo a series of redox reactions. At the end of this chain, the electrons...
Electron Transport Chain
The electron transport chain involves a series of protein complexes on the inner mitochondrial membrane that undergo a series of redox reactions. At the end of this chain, the electrons...
102.3K
Ion-Exchange Chromatography
779
Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
779

