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Journals / Turkish Journal of Chemistry / 2015 / Cilt: 39 - Sayı: 3

Dinitrogen reduction on a polypyrrole coated Pt electrode under high-pressure conditions: electrochemical impedance spectroscopy studies

DİDEM BALUN KAYAN
FATİH KÖLELİ
Pages
648
Publication Date
2015-08-13
DOI
—
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AI Summary & Key Takeaways

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⚡ TL;DR(Too Long; Didn't Read)

It was found that the optimum film thickness of polypyrrole was 0.73 $\mu $m and optimum potential for ammonia synthesis was -0.150 V under 60 bar N$_{2}$-pressure.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:The electrochemical impedance spectroscopy (EIS) responses of a polypyrrole (PPy)-coated platinum electrode were investigated during N$_{2}$-reduction to ammonia in aqueous medium.
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Key Findings & Data:It was found that the optimum film thickness of polypyrrole was 0.73 $\mu $m and optimum potential for ammonia synthesis was -0.150 V under 60 bar N$_{2}$-pressure.
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Conclusion & Impact:Tafel slopes calculated from the Tafel curve and EIS-Tafel diagram gave corresponding results: 0.121 V dec$^{-1}$ and 0.128 V dec$^{-1}$, respectively; $\alpha $-transfer coefficient of 0.49 and an exchange current density with a value of 3.17 10$^{-3}$ A cm$^{-2}$ were characteristic for H$_{ad}$ formation in acidic aqueous medium.
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:Dinitrogen reduction · conducting polypyrrole coating · high pressure reaction

Abstract

The electrochemical impedance spectroscopy (EIS) responses of a polypyrrole (PPy)-coated platinum electrode were investigated during N$_{2}$-reduction to ammonia in aqueous medium. Kinetic parameters such as film resistance, pore resistance, and double layer capacitance were analyzed as a function of applied potential and polymer film thickness. The relation between kinetic parameters was discussed by combining electrolysis results. It was found that the optimum film thickness of polypyrrole was 0.73 $\mu $m and optimum potential for ammonia synthesis was -0.150 V under 60 bar N$_{2}$-pressure. The impedance responses under these conditions presented the lowest pore resistance value of ca. 2 $\Omega $ cm$^{2}$. The electrolyte resistance was also 2 $\Omega $ cm$^{2}$ and the film resistance was ca. 5 $\Omega $ cm$^{2}$. Tafel slopes calculated from the Tafel curve and EIS-Tafel diagram gave corresponding results: 0.121 V dec$^{-1}$ and 0.128 V dec$^{-1}$, respectively; $\alpha $-transfer coefficient of 0.49 and an exchange current density with a value of 3.17 10$^{-3}$ A cm$^{-2}$ were characteristic for H$_{ad}$ formation in acidic aqueous medium.

Özet

The electrochemical impedance spectroscopy (EIS) responses of a polypyrrole (PPy)-coated platinum electrode were investigated during N$_{2}$-reduction to ammonia in aqueous medium. Kinetic parameters such as film resistance, pore resistance, and double layer capacitance were analyzed as a function of applied potential and polymer film thickness. The relation between kinetic parameters was discussed by combining electrolysis results. It was found that the optimum film thickness of polypyrrole was 0.73 $\mu $m and optimum potential for ammonia synthesis was -0.150 V under 60 bar N$_{2}$-pressure. The impedance responses under these conditions presented the lowest pore resistance value of ca. 2 $\Omega $ cm$^{2}$. The electrolyte resistance was also 2 $\Omega $ cm$^{2}$ and the film resistance was ca. 5 $\Omega $ cm$^{2}$. Tafel slopes calculated from the Tafel curve and EIS-Tafel diagram gave corresponding results: 0.121 V dec$^{-1}$ and 0.128 V dec$^{-1}$, respectively; $\alpha $-transfer coefficient of 0.49 and an exchange current density with a value of 3.17 10$^{-3}$ A cm$^{-2}$ were characteristic for H$_{ad}$ formation in acidic aqueous medium.

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Cite This Article

KAYAN, D. B., KÖLELİ, F. (2015). Dinitrogen reduction on a polypyrrole coated Pt electrode under high-pressure conditions: electrochemical impedance spectroscopy studies. Turkish Journal of Chemistry, Cilt: 39 - Sayı: 3, 648. https://ajindex.com/articles/184974

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References (22)

  1. van der Ham, C. J. M.; M. Koper, T. M.; Hetterscheid, D. G. H. Chem. Soc. Rev. 2014, 43, 5183–5191.
  2. Crossland, J. L.; Tyler, D. R. Coord. Chem. Rev. 2010, 254, 1883–1894.
  3. Cao, Z.; Zhou, Z.; Wan, H.; Zhang, Q. Inter. J. Quantum Chem. 2005, 103, 344–353.
  4. Pool, J. A.; Lobkovsky, E.; Chirik, P. J. Nature 2004, 427, 527–530. K¨oleli, F.; Balun Kayan, D. J. Electroanal. Chem. 2010, 638, 119–122. K¨oleli, F.; R¨opke, D.; Aydın, R.; R¨opke, T. J. Appl. Electrochem. 2011, 41, 405–413.
  5. Howalt, J. G.; Vegge, T. Phys. Chem. Chem. Phys. 2013, 15, 20957. Strelets, V. V.; Gavrilov, A. B.; Tsarev, V. N.; Shilova, A. K.; Didenko, L. P.; Shilov, A. E. Kinet. Catal. 1986, 27, 284–290.
  6. Giddey, S.; Badwal, S. P. S.; Kulkarni, A. Int. J. Hydrogen Energy 2013, 38, 14576–14594.
  7. Denisov, N. T.; Efimov, O. N.; Shuvalova, N. I.; Nikolaeva, G. V.; Lisitskaya, A. P. Catal. 1990, 31, 1295–1296.
  8. Valov, I.; Luerssen, B.; Mutoro, E.; Gregoratti, E. L.; De Souza, R. A.; Bredow, T.; Gunther, S.; Barinov, A.; Dudin, P.; Martin, M.; et al. Phys. Chem. Chem. Phys. 2011, 13, 3394–3410.
  9. Tsuneto, A.; Kudo, A.; Sakata, T. J. Electroanal. Chem. 1994, 367, 183–188.
  10. Ito, Y.; Goto, T. J. Nucl. Mater. 2005, 344, 128–135.
  11. Marnellos, G.; Stoikides, M. Science 1998, 282, 98–100.
  12. Kordali, V.; Kryiacou, G.; Lambrou, C. Chem. Commun. 2000, 17, 1673–1674.
  13. Murakami, T.; Nohira, T. Goto, T.; Ogata, Y. H.; Ito, Y. Electrochim. Acta 2005, 50, 5423-5426.
  14. Murakami, T.; Nishikiori, T.; Nohira, T.; Ito, Y. Electrochem. Solid-State Lett. 2005, 8 D19–D21. K¨oleli, F.; R¨opke, T. Appl. Cata. B 2006, 62, 306–310. Posp´ıˇsil, L.; Bul´ıˇckov´a, J.; Hromadova, M.; Gal, M.; Civis, S.; Cihelka, J.; Tarabek, J. Chem. Commun. 2007, 2270–2272.
  15. Murakami, T.; Nohira, T.; Araki, Y.; Goto, T.; Hagiwara, R.; Ogata, Y. H. Electrochem. Solid-State Lett. 2007, 10, E4–E6. Hickling, A.; Salt, F. W. Trans. Faraday Soc. 1940, 36, 1226–1235.
  16. Kumar, D.; Sharma, R. C. Eur. Polym. J. 1998, 34, 1053–1060.
  17. Hu, C. C.; Chu, C. H. J. Electroanal. Chem. 2001, 503, 105–116.
  18. Ren, Y. J.; Zeng, C. L. J. Power Sources 2008, 182, 524–530.
  19. Hitz, C.; Lasia, A. J. Electroanal. Chem. 2001, 500, 213–222.
  20. Losiewicz, B.; Budniok, A.; Rowinski, E.; Lagiewka, E.; Lasia, A. Int. J. Hydrogen Energy 2004, 29, 145–157. T¨uken, T.; Erbil, M.; Yazıcı, B. In Corrosion Research Trends; Wang, I. S., Ed. Nova: Hauppauge, NY, USA, 2007, pp. 1–42.
  21. Yamada, Y.; Sasaki, T.; Tatsuda, N.; Weingarth, D.; Yano, K.; K¨otz, R. Electrochim. Acta 2012, 81, 138–148.
  22. Hagen, G.; Dubbe, A.;