动态回氧诱导局部电荷积累加速质子交换膜电解
Bin Chang1,2,3, Yuanfu Ren1,2, Nan Mu4
1Center for Renewable Energy and Storage Technologies (CREST), Physical Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia.
Advanced materials (Deerfield Beach, Fla.)
|January 2, 2025
概括
电容通过促进电荷积累和伪电容性来增强质子交换膜电解的氧化催化剂,从而改善氧化演化反应动力学和稳定性.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
背景情况:
- 氧进化反应 (OER) 对于质子交换膜 (PEM) 电解至关重要,但在动力学上是有限的.
- 在OER中的应用偏差主要集中在电子转移上,忽视了电荷积累的影响.
- 了解偏差驱动的电荷积累是提高电催化剂性能的关键.
研究的目的:
- 调查偏差驱动的电荷积累对OER性能的影响.
- 通过结合电容元件来增强PEM电解中的OER动力学.
- 为酸性环境开发稳定高效的电催化剂.
主要方法:
- 将电容 (Mn) 融入氧化 (IrO2) 中,以创建一种新的电催化剂.
- 在应用偏差下分析局部电子结构和吸附行为.
- 电化学表征包括伪电容和氧空位形成能量测量.
- 在PEM电解器中测试开发材料的性能.
主要成果:
- 在OER前的区域中,Mn与IrO2的结合诱导了显著的伪电容,促进了OER的动力学.
- 应用偏差触发了动态氧化还原反应和催化剂表面的局部电荷积累.
- 增加氧气空隙形成能量抑制了晶格氧气激活,增强了稳定性.
- 优化的PEM电解仪表现出低驱动电压 (1.637V在2.0 A cm-2) 和出色的长期稳定性 (>800小时).
结论:
- 偏差驱动的电荷积累和动态氧化还原反应对于增强OER至关重要.
- 在IrO2中的电容Mn有效调节电子结构和吸附,改善催化活性.
- 这种方法为设计在酸性介质中用于PEM电解的高性能电催化剂提供了一个有希望的策略.
相关概念视频
Electrolysis
26.0K
In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
26.0K
Potentiometry: Membrane Electrodes
450
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...
450
Chemiosmosis and ATP Synthesis
The electron transport chain is a critical component of cellular respiration, occurring in the inner mitochondrial membrane. It facilitates the transfer of high-energy electrons from reduced cofactors NADH and FADH₂ to molecular oxygen, the final electron acceptor. This transfer of electrons through a series of protein complexes is tightly coupled to the translocation of protons across the membrane, generating a proton gradient essential for ATP synthesis.Electron Flow and Proton...
Voltaic/Galvanic Cells
56.7K
Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
56.7K
Chemiosmosis
97.0K
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...
97.0K
ATP Driven Pumps I: An Overview
7.9K
ATP-driven pumps, also known as transport ATPases, are integral membrane proteins. They have binding sites for ATP located on the membrane's cytosolic side and the ion-conducting domain in the transmembrane region. These pumps use the free energy released from ATP hydrolysis to move the solutes across cell membranes against an electrochemical gradient.
There are four main types of ATP-driven pumps - P-type, V-type, F-type, and ABC transporter. All these pumps are of varying complexities and...
There are four main types of ATP-driven pumps - P-type, V-type, F-type, and ABC transporter. All these pumps are of varying complexities and...
7.9K


