Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 38, Pages 45521-45527Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c12512
Keywords
electrocatalysis; nonprecious metal; cobalt phosphide nanomaterials; nitrate electroreduction; ammonia
Funding
- National Natural Science Foundation of China [21972089]
- Natural Science Foundation of Shaanxi Province [2020JM-282]
- Key Research and Development Project of Shaanxi Province [2020SF-355]
- Fundamental Research Funds for the Central Universities [GK201902014, GK201901002]
- Innovation Team Project for Graduate Student at Shaanxi Normal University [TD2020048Y]
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This study successfully synthesized porous and amorphous cobalt phosphide nanoshuttles with outstanding electroactivity for nitrate electroreduction reaction. The CoP PANSs exhibited high Faraday efficiency and yield rate for ammonia production, surpassing most reported values for various electrocatalysts. This suggests promising applications for cobalt phosphide nanomaterials in nitrate remediation.
The nitrate electroreduction reaction (NO3--ERR) is an efficient and green approach for nitrate remediation, which requires a highly active and selective electrocatalyst. In this work, porous and amorphous cobalt phosphide nanoshuttles (CoP PANSs) are successfully synthesized by using Mg2+ ion-doped calcium carbonate nanoshuttles (Mg-CaCO3 NSs) as the initial reaction precursor via precipitation transformation and a high-temperature phosphidation strategy. Various physical characterizations show that CoP PANSs have porous architecture, amorphous crystal structure, and big surface area. Electrochemical measurements reveal for the first time that CoP PANSs have outstanding electroactivity for NO3--ERR in a neutral electrolyte. At an applied potential of -0.5 V vs reversible hydrogen electrode, CoP PANSs can achieve a high Faraday efficiency (94.24 +/- 2.8%) and high yield rate (19.28 +/- 0.53 mg h(-1) mg(cat)(-1)) for ammonia production, which exceeds most reported values at various electrocatalysts for NO3--ERR. Thus, the present result indicates that cobalt phosphide nanomaterials have promising application for NO3--ERR.
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