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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

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Published on: April 10, 2018

Efficient Nitrate-to-Ammonia Electroreduction at Cobalt Phosphide Nanoshuttles.

Yi Jia¹, Yi-Gang Ji², Qi Xue¹

¹Shaanxi Key Laboratory for Advanced Energy Devices, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an 710062, PR China.

ACS Applied Materials & Interfaces

|September 20, 2021

Summary

Porous cobalt phosphide nanoshuttles (CoP PANSs) show excellent performance for nitrate electroreduction reaction (NO₃⁻-ERR) to produce ammonia. This green approach offers high efficiency and yield, indicating promising applications for nitrate remediation.

Keywords:

ammonia cobalt phosphide nanomaterials electrocatalysis nitrate electroreduction nonprecious metal

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Area of Science:

Materials Science
Electrochemistry
Environmental Science

Background:

Nitrate electroreduction reaction (NO₃⁻-ERR) is a key process for nitrate remediation.
Developing highly active and selective electrocatalysts is crucial for efficient NO₃⁻-ERR.

Purpose of the Study:

To synthesize porous and amorphous cobalt phosphide nanoshuttles (CoP PANSs) as electrocatalysts.
To investigate the electrocatalytic activity of CoP PANSs for NO₃⁻-ERR in a neutral electrolyte.

Main Methods:

Synthesis of Mg²⁺ ion-doped CaCO₃ nanoshuttles as precursors.
Precipitation transformation and high-temperature phosphidation for CoP PANSs synthesis.
Physical characterization (porosity, amorphous structure, surface area) and electrochemical measurements.

Main Results:

CoP PANSs exhibit porous architecture, amorphous crystal structure, and large surface area.
CoP PANSs demonstrate outstanding electroactivity for NO₃⁻-ERR in neutral media.
High Faraday efficiency (94.24%) and ammonia yield rate (19.28 mg h⁻¹ mg⁻¹) achieved at -0.5 V vs RHE.

Conclusions:

CoP PANSs are highly effective electrocatalysts for NO₃⁻-ERR.
The synthesized nanomaterials offer a promising pathway for efficient ammonia production and nitrate remediation.
Cobalt phosphide nanomaterials show significant potential for practical NO₃⁻-ERR applications.