可控制的电子传输量身定制d-band中心通过-氧桥接Ru/Fe双站点促进氧气进化
Yu Zhu1, Shunqiang Zhang1, Runzhe Chen1
1College of Materials Science and Engineering, Fuzhou University, Fuzhou, 350108, China.
Small (Weinheim an der Bergstrasse, Germany)
|January 11, 2024
概括
研究人员通过精确调整氧化 (CoOOH) 的电子结构,为氧化演化反应 (OER) 设计了一种新型催化剂. 这种双站点策略显著提高了催化活性和性条件下的耐用性.
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:
- 为高效的氧演化反应 (OER) 量身定制金属 (氧) 氧化物 (MOOH) 的电子结构至关重要,但具有挑战性.
- 了解活性位点在重建的MOOH催化剂中的作用是提高OER性能的关键.
研究的目的:
- 为了合理设计和合成一种新的MOOH催化剂,并为增强的OER量身定制电子结构.
- 通过计算指导,研究电子传输的机制及其对活跃站点的影响.
主要方法:
- 密度函数理论 (DFT) 的计算指导了双站点监管策略的设计.
- 一种具有特定Ru-O-Co-O-Fe结合结构的 (Ru2Fe2Co6) OOH催化剂的合成.
- 在性OER中催化剂性能的电化学表征.
主要成果:
- 工程设计的Ru-O-Co-O-Fe协调促进了电子转移,优化了Co网站的电子配置.
- 这种电子调制削弱了OH*和O*中间体的吸附能量障碍,增强了催化活性.
- (Ru2Fe2Co6) OOH催化剂表现出较低的超电位 (248 mV) 和Tafel斜率 (32.5 mV dec-1),具有卓越的耐用性.
结论:
- 一个双站点监管策略有效地调整了MOOH催化剂的电子结构,以获得更优质的OER.
- 该研究为合理的催化剂设计提供了一个框架,并了解金属双位点在催化中的作用.
相关概念视频
Redox Equilibria: Overview
564
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...
564
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
10.2K
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.
10.2K
Redox Reactions
55.7K
Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
55.7K
Oxidative Cleavage of Alkenes: Ozonolysis
10.4K
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.
10.4K
Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate
11.5K
Alkenes can be dihydroxylated using potassium permanganate. The method encompasses the reaction of an alkene with a cold, dilute solution of potassium permanganate under basic conditions to form a cis-diol along with a brown precipitate of manganese dioxide.
11.5K
Oxidation-Reduction Reactions
65.0K
Oxidation–Reduction Reactions
65.0K


