3D Hierarchical-Architectured Nanoarray Electrode for Boosted and Sustained Urea Electro-Oxidation.

Area of Science:

• Electrochemistry
• Materials Science
• Catalysis

Background:

• Optimizing nickel-based materials is essential for efficient urea oxidation reaction (UOR) catalysis.
• Advanced electrode architectures are needed to enhance catalyst activity and durability.

Purpose of the Study:

• To design and investigate a novel 3D self-supported hierarchical nanoarray electrode (CC/MnNi@NC) for boosted and sustained UOR electrocatalysis.
• To explore the synergistic effects of electronic and architectural engineering on UOR performance.

Main Methods:

• Fabrication of a 3D nanoarray electrode integrating 0D MnNi nanoparticles (NPs) encapsulated in 1D N-doped carbon nanotubes (N-CNTs) on carbon cloth.
• Combined experimental and theoretical investigations (e.g., DFT) to understand Mn-alloying effects and reaction mechanisms.
• Electrochemical characterization to evaluate UOR activity and durability.

Main Results:

• Mn-alloying downshifts the Ni d-band center, facilitating Ni3+ generation and promoting the rate-determining step of UOR.
• The hierarchical architecture enhances operational durability, increases active site density, and improves electron/mass transfer.
• The CC/MnNi@NC electrode demonstrates admirable UOR performance, comparable to state-of-the-art electrocatalysts.

Conclusions:

• The integrated electronic and architectural engineering approach effectively boosts UOR electrocatalysis.
• The developed CC/MnNi@NC electrode shows significant potential for urea-related energy conversion technologies.
• This work provides a new strategy for designing advanced electrocatalysts through synergistic manipulation.