Pd Single-Atoms Doped Cu₃P Quantum Dots with Moderately Optimized H* Sorption Behaviors for Actualizing the...

Area of Science:

• Environmental Chemistry
• Materials Science
• Electrochemistry

Background:

• Nitrate and formaldehyde in industrial/agricultural wastewater pose significant environmental and health risks.
• Existing purification methods are energy-intensive, slow, and costly.
• There is a need for efficient and sustainable methods for pollutant removal and resource recovery.

Purpose of the Study:

• To develop a bifunctional electrocatalyst for simultaneous nitrate reduction and formaldehyde oxidation.
• To achieve efficient removal of pollutants and concurrent production of valuable chemicals (ammonia and hydrogen).
• To create a self-powered system for wastewater treatment and energy generation.

Main Methods:

• Synthesis of Pd single-atoms doped Cu3P quantum dots (Pd-Cu3P SA-QDs).
• Electrochemical evaluation of Pd-Cu3P SA-QDs for nitrate reduction reaction (NO3RR) and formaldehyde oxidation reaction (FOR).
• Construction of a self-powered galvanic system integrating both reactions.

Main Results:

• Pd-Cu3P SA-QDs demonstrated high activity and selectivity for NO3RR, producing ammonia with 99% faradaic efficiency (FE) at a positive onset potential (+0.36 V vs RHE).
• The catalyst efficiently oxidized formaldehyde (FOR) at a low onset potential (-0.07 V vs RHE), yielding formate (>90% FE) and hydrogen (>95% FE).
• A self-powered galvanic system achieved an open-circuit voltage of 0.892 V and a peak power density of 12.1 mW cm-2, generating 8.8 KWh kg-1 of electrical energy.

Conclusions:

• Pd-Cu3P SA-QDs offer a promising bifunctional electrocatalyst for simultaneous wastewater remediation and energy production.
• The dual-directional catalytic approach significantly improves efficiency and sustainability.
• This integrated system presents a novel strategy for tackling pollution and energy challenges.