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Catalysis

Catalysis

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.

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

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...

Electrodeposition

Electrodeposition

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...

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Related Experiment Video

Updated: Jun 22, 2025

On the Preparation and Testing of Fuel Cell Catalysts Using the Thin Film Rotating Disk Electrode Method

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Published on: March 16, 2018

Why do platinum catalysts show diverse electrocatalytic performance?

Qiangmin Yu¹, Zhiyuan Zhang¹, Heming Liu¹

¹Shenzhen Geim Graphene Center, Tsinghua-Berkeley Shenzhen Institute & Institute of Materials Research, Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China.

Fundamental Research

|June 27, 2024

Summary

Platinum catalysts are key for hydrogen evolution reactions, but inconsistent performance data hinders progress. This study identifies key factors influencing platinum catalyst performance and proposes evaluation criteria for reliable benchmarking.

Keywords:

Catalyst area Electrocatalyst Evaluation criteria Loading quantity Microstructure Overpotential Platinum Solution resistance

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Area of Science:

Electrocatalysis
Materials Science
Electrochemistry

Background:

Platinum catalysts are essential benchmarks for evaluating hydrogen evolution reaction (HER) electrocatalysts.
Existing literature shows significant variability in reported platinum catalyst performance, lacking a standardized reference.
This inconsistency impedes the reliable comparison and development of new HER catalysts.

Purpose of the Study:

To investigate critical factors influencing the electrocatalytic performance of platinum catalysts for HER.
To establish standardized criteria for the accurate evaluation of electrocatalyst performance.
To address the lack of a common reference standard in HER catalyst research.

Main Methods:

Experimental measurements of platinum catalyst performance under varying conditions.
Data processing and analysis to identify performance-influencing parameters.
Systematic investigation of factors including solution resistance, electrolyte temperature, loading quantity, catalyst microstructure, and current density normalization.

Main Results:

Identified solution resistance, electrolyte temperature, loading quantity, catalyst microstructure, and current density normalization as key factors affecting platinum catalyst performance.
Quantified the impact of these variables on the hydrogen evolution reaction.
Demonstrated the necessity of standardized measurement protocols for reproducible results.

Conclusions:

Standardized criteria are crucial for the reliable performance evaluation of electrocatalysts.
Addressing identified factors will improve the consistency and comparability of HER catalyst research.
Recommended guidelines for robust electrocatalyst performance assessment were established.