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Ruthenium-Engineered Active Hydrogen Dynamics in Cobalt Hydroxide: Enabling Enhanced Ammonia Synthesis and
Qiancao Liu1, Xuchen Liu1, Aike Liu2
1School of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, China.
This study presents a novel electrocatalyst for converting nitrite wastewater into ammonia. The new material enhances reaction efficiency and offers a sustainable solution for ammonia synthesis and water remediation.
Area of Science:
- Electrochemistry
- Materials Science
- Environmental Chemistry
Background:
- Electrocatalytic nitrite reduction (NO2RR) converts wastewater nitrite to ammonia (NH3).
- Challenges include low selectivity and kinetics due to insufficient active hydrogen (*H).
Purpose of the Study:
- To design and fabricate an enhanced electrocatalyst for NO2RR.
- To improve ammonia yield rate and selectivity.
- To explore photothermally assisted ammonia synthesis.
Main Methods:
- Fabrication of ruthenium nanoparticle-decorated cobalt hydroxide nanowire (Ru-Co(OH)2) electrocatalyst.
- Electrocatalytic performance evaluation for NO2RR.
- Operando spectroscopic studies and theoretical calculations.
- Development of a photothermally assisted Zn-NO2- battery.
Main Results:
- Achieved ammonia yield rate of 7.71 mg h-1 cm-2 and 93.1% Faradaic efficiency (FE) at -0.5 V vs RHE.
- Ru incorporation enhanced interfacial water adsorption and lowered water dissociation energy.
- Photothermally assisted battery showed increased power density under near-infrared (NIR) light.
Conclusions:
- Ru-Co(OH)2 electrocatalyst significantly boosts NO2RR performance.
- Heterointerfacial design is effective for sustainable ammonia synthesis.
- This approach offers a promising route for nitrite remediation and valuable ammonia production.
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