Related Experiment Video
Updated: Aug 26, 2025
10:39
Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction
Published on: August 23, 2018
8.0K
Atomically dispersed chromium coordinated with hydroxyl clusters enabling efficient hydrogen oxidation on ruthenium
Bingxing Zhang1, Baohua Zhang1, Guoqiang Zhao1
1School of Materials Science and Engineering, State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, 310027, PR China.
Nature Communications
|October 6, 2022
Summary
Atomically isolated chromium clusters boost alkaline hydrogen oxidation reaction (HOR) activity by 50-fold. This novel catalyst design enhances durability and CO resistance for anion exchange membrane fuel cells.
Area of Science:
- Electrochemistry
- Materials Science
- Catalysis
Background:
- The sluggish kinetics of the alkaline hydrogen oxidation reaction (HOR) hinder the practical application of anion exchange membrane fuel cells.
- Developing efficient electrocatalysts is crucial for accelerating alkaline HOR and improving fuel cell performance.
Purpose of the Study:
- To design and synthesize a novel catalyst with abundant and efficient interfacial active sites for accelerated alkaline HOR.
- To investigate the mechanism of enhanced HOR activity and the role of atomically isolated chromium species.
Main Methods:
- Anchoring atomically isolated chromium coordinated with hydroxyl clusters (Cr 1 (OH) x ) onto ruthenium (Ru) nanoparticles.
- Electrochemical characterization to evaluate HOR activity, durability, and CO anti-poisoning ability.
- Mechanistic studies to understand the role of interfacial active sites and oxygen species.
Main Results:
- The developed catalyst system exhibited a 50-fold enhancement in HOR activity compared to conventional catalysts.
- The catalyst demonstrated excellent durability and significant CO anti-poisoning ability.
- The active sites were switched to the Cr 1 (OH) x -Ru interface, with Cr 1 (OH) x species participating directly in hydrogen oxidation.
Conclusions:
- Atomically isolated chromium hydroxide clusters integrated into heterostructured catalysts offer a new strategy for designing advanced electrocatalysts.
- This approach significantly accelerates alkaline HOR and opens avenues for other complex electrochemical reactions.
- The size effect of co-catalysts is critical and warrants further attention in catalyst design.
Related Concept Videos
02:17Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
3.4K
Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
3.4K
02:13Reduction of Alkenes: Catalytic Hydrogenation
12.4K
Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
12.4K
02:24Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
8.0K
Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
8.0K
02:44Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
10.7K
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.
10.7K
02:21Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate
12.6K
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.
12.6K
02:50Catalysis
27.3K
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.
27.3K