Performance of Cobalt-Doped C[sub.3]N[sub.5] Electrocatalysis Nitrate in Ammonia Production

In this experiment, C[sub.3]N[sub.5] was synthesized by pyrolysis of 3-amino-1,2,4 triazole material, and then 1% Co-C[sub.3]N[sub.5], 3% Co-C[sub.3]N[sub.5], 5% Co-C[sub.3]N[sub.5], 7% Co-C[sub.3]N[sub.5], and 9% Co-C[sub.3]N[sub.5] were synthesized by varying the mass ratio of cobalt chloride to C...

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Published inCoatings (Basel) Vol. 14; no. 10
Main Authors Liang, Boyu, Wu, Yueqi, Han, Jing, Deng, Wenqiang, Zhang, Xinyao, Li, Runrun, Hong, Yan, Du, Jie, Fu, Lichun, Liao, Runhua
Format Journal Article
LanguageEnglish
Published MDPI AG 01.10.2024
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Summary:In this experiment, C[sub.3]N[sub.5] was synthesized by pyrolysis of 3-amino-1,2,4 triazole material, and then 1% Co-C[sub.3]N[sub.5], 3% Co-C[sub.3]N[sub.5], 5% Co-C[sub.3]N[sub.5], 7% Co-C[sub.3]N[sub.5], and 9% Co-C[sub.3]N[sub.5] were synthesized by varying the mass ratio of cobalt chloride to C[sub.3]N[sub.5] by stirring and ultrasonic shaking. SEM, XPS, and XRD tests were performed on the synthesized materials. The experimental results showed that Co atoms were successfully doped into C[sub.3]N[sub.5]. The electrocatalytic reduction experiments were performed to evaluate their NH[sub.3] yields and electrochemical properties. The results showed that the ammonia yield obtained by the electrolysis of the 9% Co-C[sub.3]N[sub.5] catalyst as the working electrode in a mixed electrolytic solution of 0.1 mol/L KNO[sub.3] and 0.1 mol/L KOH for 1 h at a potential of −1.0 V vs. RHE was 0.633 ± 0.02 mmol∙h[sup.−1]∙mg[sub.cat] [sup.−1], and the Faraday efficiency was 65.98 ± 2.14%; under the same experimental conditions, the ammonia production rate and Faraday efficiency of the C[sub.3]N[sub.5] catalyst were 0.049 mmol∙h[sup.−1]∙mg[sub.cat] [sup.−1] and 16.41%, respectively, and the ammonia production rate of the C[sub.3]N[sub.5] catalyst was nearly 13-fold worse than the 9% Co-C[sub.3]N[sub.5], which suggests that Co can improve the Faraday efficiency and ammonia yield of the electrocatalytic reduction of NO[sub.3] [sup.−]. This is due to the strong synergistic effect between the cobalt and C[sub.3]N[sub.5] components, with C[sub.3]N[sub.5] providing abundant and homogeneous sites for nitrogen coordination and the Co-N species present in the material being highly efficient active sites. The slight change in current density after five trials of 9% Co-C[sub.3]N[sub.5] and the decrease in ammonia yield by about 12% in five repetitions of the experiment indicate that 9% Co-C[sub.3]N[sub.5] can be recycled and work stably in electrocatalytic reactions and has good application prospects.
ISSN:2079-6412
2079-6412
DOI:10.3390/coatings14101327