Optimizing the electrocatalytic hydrogen production with vanadyl porphyrin impregnated on mesoporous SiO2 nanoparticles

IF 5.6 3区材料科学 Q1 ELECTROCHEMISTRY Electrochimica Acta Pub Date : 2025-02-20 Epub Date: 2025-01-11 DOI:10.1016/j.electacta.2025.145686

Zhannur Myltykbayeva , José M. López Nieto , Beatriz M. Moreno-Torralbo , Patricia Concepción , Akerke Abylaikhan , Atıf Koca

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Abstract

Vanadyl octaethyl porphyrin (VOP) impregnated on SiO₂ nanoparticles (SiO₂@VOP) was investigated as an electrocatalyst for the water-splitting reaction for the cathodic hydrogen evolution reaction (HER). Multi-valent oxidation states of VO²⁺ center and multi-electron transfer properties of the porphyrin ring made this complex a potential candidate for the electrocatalytic processes. Altering the electrode modification protocol by changing the amount of the VOP, carbon black (CB), and Nafion (Nf) binder on the modification influenced the active sites, thus consequently enhancing the electrocatalytic activity of SiO₂@VOP composites. Electrocatalytic HER measurements indicated excellent activity with low overpotential (108 mV), small Tafel slope (98 mV/dec), and high current density stability with the GCE/CB@SiO₂@VOP(B) electrode.

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介孔SiO2纳米颗粒浸渍钒基卟啉优化电催化制氢

研究了浸渍在SiO2纳米颗粒（SiO2@VOP）上的钒八乙基卟啉（VOP）作为阴极析氢反应（HER）中水裂解反应的电催化剂。VO2+中心的多价氧化态和卟啉环的多电子转移性质使该配合物成为电催化过程的潜在候选物。通过改变VOP、炭黑（CB）和Nafion （Nf）粘结剂的用量来改变电极修饰方案，从而影响活性位点，从而提高SiO2@VOP复合材料的电催化活性。电催化HER测量表明，GCE/CB@SiO2@VOP(B)电极具有低过电位（108 mV）、小Tafel斜率（98 mV/dec）和高电流密度稳定性的优异活性。

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来源期刊

Electrochimica Acta 工程技术-电化学

CiteScore

11.30

自引率

6.10%

发文量

1634

审稿时长

41 days

期刊介绍： Electrochimica Acta is an international journal. It is intended for the publication of both original work and reviews in the field of electrochemistry. Electrochemistry should be interpreted to mean any of the research fields covered by the Divisions of the International Society of Electrochemistry listed below, as well as emerging scientific domains covered by ISE New Topics Committee.