Constructing High Efficiency CoZn_x Mn_2-x O₄ Electrocatalyst by Regulating the Electronic Structure and Surface...

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Developing efficient electrocatalysts is crucial for energy applications.
• Controlling defects at the atomic scale is challenging but key to enhancing catalyst performance.

Purpose of the Study:

• To synthesize vacancy-dependent CoZnₓMn₂₋ₓO₄ electrocatalysts by tuning Zn ion concentration.
• To investigate the relationship between catalyst structure, defects, and electrocatalytic activity.

Main Methods:

• Synthesis of CoZnₓMn₂₋ₓO₄ catalysts with varying Zn concentrations.
• In situ activation to induce surface reconstruction.
• Electrocatalytic performance testing.
• Density Functional Theory (DFT) calculations.

Main Results:

• Tailoring Zn ion concentration in CoZnₓMn₂₋ₓO₄ created controllable defects.
• In situ activation led to surface reconstruction, forming active Mn, Co-MOOH species and oxygen vacancies.
• The Zn-CoMn₂O₄-1.5 catalyst exhibited performance comparable to IrO₂ and Pt/C, with a cell voltage of 1.63 V and long durability.
• DFT calculations confirmed that Zn doping enhances surface electronic properties, improving charge carrier density and reducing adsorption energy.

Conclusions:

• Vacancy-dependent CoZnₓMn₂₋ₓO₄ catalysts offer a viable strategy for high-performance electrocatalysis.
• Precise control over atomic-scale defects, facilitated by Zn doping, significantly boosts electrocatalytic activity and stability.
• These findings provide insights into designing advanced electrocatalysts for energy conversion technologies.