Related Experiment Video
Updated: Jun 2, 2025
06:32
A Simple, Low-cost, and Robust System to Measure the Volume of Hydrogen Evolved by Chemical Reactions with Aqueous Solutions
Published on: August 17, 2016
19.5K
High-entropy layered double hydroxides tailor Pt electron state for promoting acidic hydrogen evolution reaction
1Key Laboratory of Advanced Catalytic Materials and Technology, Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, Changzhou University, Changzhou, Jiangsu Province 213164, China.
Journal of Colloid and Interface Science
|January 14, 2025
Summary
We developed Pt/HE-LDH catalysts for efficient hydrogen evolution reactions (HER) in acidic solutions. This design enhances hydrogen spillover and stability, overcoming limitations of current metal hydroxide catalysts.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Platinum (Pt)-catalyzed hydrogen evolution reaction (HER) is crucial for clean energy, but stability issues in acidic media persist.
- Existing oxophilic metal-hydroxide surface hybridization methods suffer from active hydrogen aggregation and poor operational durability.
- Inefficient hydrogen desorption and metal hydroxide instability hinder practical applications of Pt-based HER catalysts.
Purpose of the Study:
- To design a novel catalyst with enhanced activity and stability for the hydrogen evolution reaction (HER) in acidic electrolytes.
- To investigate the mechanisms behind improved catalytic performance and durability using Pt nanoparticles-modified high-entropy layered double hydroxides (Pt/HE-LDH).
- To address the challenges of active hydrogen aggregation and poor operational stability in acidic HER.
Main Methods:
- Synthesis of Pt nanoparticles-modified NiFeCoCuCr high-entropy layered double hydroxides (Pt/HE-LDH).
- Electrochemical characterization to evaluate catalytic activity and stability for HER in acidic electrolytes.
- Analysis of interfacial electronic effects, hydrogen spillover dynamics, and material stability using advanced techniques.
Main Results:
- Pt/HE-LDH demonstrated exceptional catalytic activity for HER in acidic electrolytes.
- A built-in electric field (BIEF) at the Pt/HE-LDH interface facilitated charge redistribution and optimized hydrogen adsorption.
- Effective bidirectional hydrogen spillover between Pt and HE-LDH enhanced catalytic efficiency and material durability.
- High entropy-induced phase stability contributed to superior operational stability in acidic conditions.
Conclusions:
- The Pt/HE-LDH catalyst offers a promising strategy for enhancing hydrogen spillover and improving the durability of metal hydroxides under acidic HER conditions.
- This work presents a facile method to overcome the limitations of active hydrogen aggregation and poor stability in Pt-catalyzed HER.
- The developed catalyst exhibits significant potential for efficient and stable hydrogen production in acidic environments.
Related Concept Videos
02:13Reduction of Alkenes: Catalytic Hydrogenation
11.8K
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...
11.8K
02:17Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
3.2K
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...
3.2K
01:01Acid Halides to Carboxylic Acids: Hydrolysis
2.5K
Hydrolysis of acid halides is a nucleophilic acyl substitution reaction in which acid halides react with water to give carboxylic acids. The reaction occurs readily and does not require acid or a base catalyst.
As shown below, the mechanism involves a nucleophilic attack by water at the carbonyl carbon to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen π bond along with the departure of a halide ion. A final proton transfer step yields carboxylic...
As shown below, the mechanism involves a nucleophilic attack by water at the carbonyl carbon to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen π bond along with the departure of a halide ion. A final proton transfer step yields carboxylic...
2.5K
02:50Catalysis
26.6K
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.
26.6K
01:08Electrodeposition
584
Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
Electrodeposition can...
584
02:24Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
7.6K
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.
7.6K