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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.

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: Dec 14, 2025

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

Published on: April 10, 2018

Size-Dependent Nickel-Based Electrocatalysts for Selective CO₂ Reduction.

Zhida Li^1,2, Dong He³, Xingxu Yan⁴

¹College of Chemistry & Chemical Engineering, Northeast Petroleum University, Daqing, 163318, China.

Angewandte Chemie (International Ed. in English)

|July 21, 2020

Summary

This summary is machine-generated.

Converting atmospheric carbon dioxide (CO2) into chemicals using nickel (Ni) catalysts is key to mitigating climate change. This study shows Ni single atoms offer superior CO2 reduction efficiency compared to larger nanoparticles.

Keywords:

CO selectivity CO2 reduction DFT calculations nickel size dependence

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Area of Science:

Catalysis
Materials Science
Environmental Chemistry

Background:

Rising atmospheric CO2 concentrations necessitate innovative carbon capture and utilization strategies.
Converting CO2 into valuable chemicals offers a pathway to a circular carbon economy.
Nanostructured catalysts are crucial for efficient electrochemical CO2 reduction.

Purpose of the Study:

To investigate the effect of nickel (Ni) metal catalyst size on CO2 reduction performance.
To synthesize size-controlled Ni catalysts on N-doped carbon substrates derived from zeolitic imidazolate frameworks (ZIFs).
To evaluate catalyst selectivity and efficiency for CO2 reduction versus hydrogen evolution.

Main Methods:

Synthesis of N-doped carbon substrates from converted ZIFs.
Preparation of Ni metal catalysts with sizes ranging from single atoms to >100 nm.
Electrochemical evaluation of CO2 reduction reaction (CO2RR) and hydrogen evolution reaction (HER) performance using techniques like Faradaic efficiency (FE) measurements.

Main Results:

Ni single-atom catalysts exhibited exceptional CO selectivity (ca. 97%) at -0.8 V vs. RHE.
Ni nanoparticles (4.1 nm) showed slightly lower CO selectivity (ca. 93%).
Larger Ni particles (37.2 nm) led to a significant decrease in CO2RR efficiency (<30% FE for CO) and a rise in HER (>70% efficiency).

Conclusions:

Catalyst size critically influences the selectivity and efficiency of Ni-catalyzed CO2 reduction.
Single-atom Ni catalysts are highly effective for selective CO production from CO2.
Controlling Ni particle size is essential for optimizing CO2RR and suppressing competing HER.