质子化使在商业TiO2/IrO2上实现了持久和高效的水氧化
Da Huang1, Yu Du1, Haoyang Hu1
1Collaborative Innovation Center of Advanced Microstructures, National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Nanjing University, No. 22 Hankou Road, Nanjing, Jiangsu 210093, P. R. China.
The journal of physical chemistry letters
|September 10, 2025
概括
在二氧化 (IrO2) /TiO2催化剂中对二氧化 (TiO2) 进行质子化,可显著降低电子转移障碍. 这种增强提高了氧进化反应 (OER) 的性能,为高效的阳极催化剂提供了一种新策略.
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
- 催化剂是一种催化剂.
背景情况:
- 在二氧化 (TiO2) 催化剂上支持的商用二氧化 (IrO2) 由于在IrO2/TiO2接口上的高电子转移障碍而表现有限.
- 这些障碍阻碍了高效的氧演化反应 (OER) 动力学,这是各种电化学应用中的关键过程.
研究的目的:
- 开发一个简单的策略,以提高商业的IrO2/TiO2催化剂的OER性能.
- 研究质子化在减轻电子转移障碍和改善催化剂稳定性方面的作用.
主要方法:
- 采用了阴极极化策略,以质子化商用IrO2/TiO2催化剂的TiO2元件,从而产生质子化TiO2 (p-TiO2).
- 评估了改造的IrO2/p-TiO2催化剂的电化学性能,特别是OER活性和耐用性.
主要成果:
- TiO2的质子化在催化剂表面引入了高密度的Ti3+-OH极离子状态.
- 这些极子状态有效地降低了IrO2/TiO2接口上的电子转移障碍.
- 由此产生的IrO2/p-TiO2催化剂在10mA/cm2时表现出246±3mV的超低OER超电位,并保持了超过200小时的稳定性.
- 改善的耐久性与Ti3+-OH状态的电子补偿有关,这抑制了活性位的过氧化.
结论:
- 阴极极化是一种有效且简单的方法,可以提高IrO2/TiO2催化剂的OER性能.
- 通过质子化引入Ti3+-OH极离子状态是减少界面电子转移阻力和提高催化剂稳定性的关键.
- 这种电化学改造为设计先进的阳极催化剂提供了一个有前途的新范式,不需要复杂的设备或高温处理.
相关概念视频
Titration in Nonaqueous Solvents
1.3K
Most acid-base titrations are performed in an aqueous medium. In aqueous titrations, water competes with weaker acids or bases for proton donation or acceptance, leading to ambiguous endpoints in the titration curve. Water also affects the partial ionization of weak acids or bases. For example, water accepts a proton from acetic acid to form hydronium and acetate ions. The hydronium ion formed is a stronger acid than acetic acid, and the acetate ion is a stronger base than water. As a result,...
1.3K
Hydroboration-Oxidation of Alkenes
11.1K
In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
11.1K
Catalysis
30.1K
The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
30.1K
Oxidation of Alcohols
15.7K
In this lesson, the oxidation of alcohols is discussed in depth. The various reagents used for oxidation of primary and secondary alcohols are detailed, and their mechanism of action is provided.
The process of oxidation in a chemical reaction is observed in any of the three forms:
The process of oxidation in a chemical reaction is observed in any of the three forms:
15.7K
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
12.6K
Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
12.6K
Keto–Enol Tautomerism: Mechanism
7.6K
The keto and enol forms are known as tautomers and they constantly interconvert (or tautomerize) between the two forms under acid or base catalyzed conditions. Both the reactions involve the same steps—protonation and deprotonation— although in the reverse order.
7.6K


