在不对称的活性单元中加速质子转移以实现可持续的酸氧演化反应
Liming Deng1, Sung-Fu Hung2, Shuyi Liu1
1College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.
Journal of the American Chemical Society
|August 7, 2024
概括
具有不对称活性单元的新氧化催化剂克服了质子交换膜水电解中的耐用性问题. 这一突破提高了氧气演变反应性能和工业应用的稳定性.
科学领域:
- 材料科学
- 电化学
- 催化剂
背景情况:
- 基于 (Ru) 的催化剂对于质子交换膜水电解 (PEMWE) 至关重要,但在酸性条件下耐用性较差.
- 现有的RuO2催化剂在氧化演化反应 (OER) 的活性和稳定性方面存在局限性.
研究的目的:
- 在PEMWE中开发耐用的高活性Ru基催化剂,用于酸氧演化反应 (OER).
- 通过引入不对称的活性单元来克服RuO2固有的活性和稳定性限制.
主要方法:
- 合成的 Ru1-xMxO2 (M = Sb,In,Sn) 的二元固体溶液氧化物,具有不对称的活性单位.
- 研究了催化剂的结构和电子特性,重点是Ru-O-Sb相互作用.
- 在工业条件下评估了酸性OER和PEMWE的催化性能.
主要成果:
- 构建了具有强大的电子移位的不对称Ru-O-Sb单元,从而增强了结构完整性.
- 优化的Ru0.8Sb0.2O2催化剂具有较低的超电位 (160 mV在10 mA cm-2) 和卓越的稳定性 (1100 h).
- 在工业条件下,尺度准备的Ru0.8Sb0.2O2显示出高效的PEMWE性能.
结论:
- 在RuO2中引入耐酸p块金属位点,产生不对称的活性单元,增强了OER的活性和稳定性.
- 在不对称的Ru-O-M单元中增强的质子传输为酸性OER提供了一条新途径,在不损害耐用性的情况下打破了缩放关系.
- 开发的Ru0.8Sb0.2O2催化剂代表了PEMWE实际应用的重大进步.
相关概念视频
Catalysis
26.8K
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.
26.8K
Phase I Oxidative Reactions: Overview
255
Phase I biotransformation, or functionalization, is a crucial chemical process that converts drugs and other xenobiotics into more water-soluble forms, facilitating expulsion from the body. It involves oxidative, reductive, and hydrolytic reactions that add or unveil polar functional groups on lipophilic substrates. Key players in phase I reactions are the mixed-function oxidases. Situated in liver cell microsomes, these enzymes predominantly carry out drug metabolism. They require molecular...
255
Chemiosmosis
97.5K
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...
97.5K
Oxidative Cleavage of Alkenes: Ozonolysis
10.1K
In ozonolysis, ozone is used to cleave a carbon–carbon double bond to form aldehydes and ketones, or carboxylic acids, depending on the work-up.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
10.1K
Redox Equilibria: Overview
545
A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
545
The Z-Scheme of Electron Transport in Photosynthesis
10.0K
The light reactions of photosynthesis assume a linear flow of electrons from water to NADP+. During this process, light energy drives the splitting of water molecules to produce oxygen. However, oxidation of water molecules is a thermodynamically unfavorable reaction and requires a strong oxidizing agent. This is accomplished by the first product of light reactions: oxidized P680 (or P680+), the most powerful oxidizing agent known in biology. The oxidized P680 that acquires an electron from the...
10.0K


