Combining surface chemical functionalization with introducing reactive oxygen species boosts ethanol electrooxidation
Jinjuan Zhao1, Junhao Shu1, Jiaxiao Wang1
1State Key Laboratory of Applied Organic Chemistry (SKLAOC), Key Laboratory of Advanced Catalysis of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China. lishw@lzu.edu.cn.
Nanoscale
|November 16, 2022
Summary
A new palladium-ceria nanocomposite catalyst (Pd-CeO2-/FGS) enhances ethanol oxidation reactions. Functional groups and oxygen vacancies improve activity, kinetics, and durability, outperforming commercial catalysts.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Functional groups and oxygen vacancies enhance palladium-based electrocatalysts.
- Ethanol oxidation reaction (EOR) is crucial for energy conversion.
- Developing efficient and durable electrocatalysts for EOR is essential.
Purpose of the Study:
- To synthesize and evaluate a novel amorphous ceria-modified palladium nanocomposite anchored on D-4-amino-phenylalanine (DAP)-functionalized graphene nanosheets (Pd-CeO2-/FGS).
- To investigate the electrocatalytic performance of Pd-CeO2-/FGS for the ethanol oxidation reaction (EOR) in alkaline media.
- To understand the role of DAP-functionalization and CeO2- modification in enhancing EOR activity.
Main Methods:
- One-pot synthesis of Pd-CeO2-/FGS nanocomposite.
- Electrocatalytic characterization of the synthesized material for EOR.
- Analysis of structural and compositional properties to correlate with performance.
Main Results:
- The Pd-CeO2-/FGS catalyst exhibited high electrocatalytic activity, fast kinetics, and excellent antipoisoning ability for EOR.
- The catalyst demonstrated robust durability, outperforming commercial Pd/C and other comparable electrocatalysts.
- DAP-functionalization introduced functional groups, while CeO2- modification introduced oxygen vacancies, both contributing to enhanced EOR properties.
Conclusions:
- The enhanced EOR performance of Pd-CeO2-/FGS is attributed to the synergistic effects of DAP-functionalization and CeO2- modification.
- Functional groups modulate Pd electron density and nanoparticle anchoring, while oxygen vacancies improve OHads adsorption and reaction kinetics.
- This study presents a promising strategy for designing advanced electrocatalysts for oxidation reactions.
More Related Videos
Related Concept Videos
02:37Oxidation of Alcohols
13.4K
In this lesson, the oxidation of alcohols is discussed in depth. The various reagents used for oxidation of primary and secondary alcohols are detailed, and their mechanism of action is provided.
The process of oxidation in a chemical reaction is observed in any of the three forms:
The process of oxidation in a chemical reaction is observed in any of the three forms:
13.4K
01:21Radical Oxidation of Allylic and Benzylic Alcohols
2.1K
Activated manganese(IV) oxide can selectively oxidize allylic and benzylic alcohols via a radical intermediate mechanism. Primary allylic alcohols are oxidized to aldehydes, while secondary allylic alcohols yield ketones. The redox reaction of potassium permanganate with an Mn(II) salt such as manganese sulfate (under either alkaline or acidic conditions), followed by thorough drying, yields the oxidizing agent: activated MnO2. While MnO2 is insoluble in the solvents used for the reaction, the...
2.1K
02:04Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids
6.1K
Diols are compounds with two hydroxyl groups. In addition to syn dihydroxylation, diols can also be synthesized through the process of anti dihydroxylation. The process involves treating an alkene with a peroxycarboxylic acid to form an epoxide. Epoxides are highly strained three-membered rings with oxygen and two carbons occupying the corners of an equilateral triangle. This step is followed by ring-opening of the epoxide in the presence of an aqueous acid to give a trans diol.
6.1K
01:46Oxidative Cleavage of Alkenes: Ozonolysis
10.8K
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.
10.8K
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
01:15Oxidations of Aldehydes and Ketones to Carboxylic Acids
4.1K
Oxidation of aldehydes and ketones results in the formation of carboxylic acids. Aldehydes, bearing hydrogen next to the carbonyl group, are easily oxidized compared to ketones. This is because an aldehydic proton can easily be abstracted during oxidation.
Aldehydes readily undergo oxidation in strong oxidizing agents such as potassium permanganate and chromic acid. The oxidation can also be carried out using mild oxidizing agents such as silver oxide. In fact, aldehydes can be easily oxidized...
Aldehydes readily undergo oxidation in strong oxidizing agents such as potassium permanganate and chromic acid. The oxidation can also be carried out using mild oxidizing agents such as silver oxide. In fact, aldehydes can be easily oxidized...
4.1K