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Free-Base Porphyrin Aggregates Combined with Nickel Phosphite for Enhanced Alkaline Hydrogen Evolution

Author

Listed:
  • Bogdan-Ovidiu Taranu

    (National Institute for Research and Development in Electrochemistry and Condensed Matter, Dr. A. Paunescu Podeanu Street No. 144, 300569 Timisoara, Romania)

  • Eugenia Fagadar-Cosma

    (Institute of Chemistry “Coriolan Dragulescu”, Mihai Viteazu Ave. 24, 300223 Timisoara, Romania)

  • Paula Sfirloaga

    (National Institute for Research and Development in Electrochemistry and Condensed Matter, Dr. A. Paunescu Podeanu Street No. 144, 300569 Timisoara, Romania)

  • Maria Poienar

    (National Institute for Research and Development in Electrochemistry and Condensed Matter, Dr. A. Paunescu Podeanu Street No. 144, 300569 Timisoara, Romania)

Abstract

In response to the escalating global energy requests and the need to address them in a sustainable manner, researchers have identified hydrogen as an energy vector that provides a practical way to store and use energy from renewable sources. To make a step forward, the electrocatalytic properties for the hydrogen evolution reaction in an alkaline medium of graphite electrodes modified with combinations of nickel phosphite and free-base porphyrins were investigated voltammetrically. The sample obtained by combining the respective phosphite with 5,10,15,20-tetrakis(4-methoxyphenyl)porphyrin exhibited the highest catalytic activity, surpassing that observed for the specimens manufactured using the individual catalysts and thus providing enhanced water-splitting performance. The best electrode displayed an overpotential of 0.43 V (at i = −10 mA/cm 2 ) and a Tafel slope of 0.14 V/dec. Since the catalytic activity of the compositions containing the metal salt and the porphyrins has not been previously studied, the investigation and its outcome constitute an original contribution to the growing water-splitting literature, providing new opportunities for obtaining better results than the ones reported for electrodes modified solely with the phosphite.

Suggested Citation

  • Bogdan-Ovidiu Taranu & Eugenia Fagadar-Cosma & Paula Sfirloaga & Maria Poienar, 2023. "Free-Base Porphyrin Aggregates Combined with Nickel Phosphite for Enhanced Alkaline Hydrogen Evolution," Energies, MDPI, vol. 16(3), pages 1-14, January.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:3:p:1212-:d:1044045
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    References listed on IDEAS

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    1. Jianqi Zhu & Zhi-Chang Wang & Huijia Dai & Qinqin Wang & Rong Yang & Hua Yu & Mengzhou Liao & Jing Zhang & Wei Chen & Zheng Wei & Na Li & Luojun Du & Dongxia Shi & Wenlong Wang & Lixin Zhang & Ying Ji, 2019. "Boundary activated hydrogen evolution reaction on monolayer MoS2," Nature Communications, Nature, vol. 10(1), pages 1-7, December.
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