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<p>In this work, electronucleation and growth of Ni-Co (nanoparticles) alloys on a glassy carbon electrode, from various Ni(II):Co(II) ratios (<i>x</i> Ni(II) : (1-<i>x</i>) Co(II), where <i>x</i> is the molar ratio) dissolved in ethylene glycol-based (EG) solutions were studied using electrochemical techniques. UV-vis and DSC measurements were utilized to validate the speciation and stability of the electrolyte solution. Electrochemical studies demonstrated the direct electrodeposition of NiCo alloys from <i>x</i> Ni(II) : (1-<i>x</i>) Co(II) in EG solutions. Analyses of current density transients revealed that the electrodeposition mechanisms and kinetics of Ni-Co alloys could be explained by a model based on 3D nucleation and diffusion-controlled growth of bimetallic nuclei on a growing surface. Surface characterization techniques such as SEM, EDS, XRD, and XPS analysis, along with DFT simulation, confirmed the formation of Ni-Co alloys electrodeposited from EG solutions with anisotropic effect of magnetic properties observed between in-plane and perpendicular fields and the coexistence of both face-centered-cubic and body-centered cubic structure. Furthermore, Ni-Co alloys have demonstrated superior electrocatalytic activity for both hydrogen evolution reaction and the oxygen evolution reaction in 0.5 M KOH with low Tafel slopes.</p> Graphical abstract <p></p>

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Diffusion-controlled growth of Ni-Co alloys from different Ni(II)-Co(II) ratios using ethylene glycol-based nonaqueous solvents: A study on morphology and physiochemical/ electrochemical properties

  • 期刊论文

  • 发表日期：

    2026年4月6日

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  • Kiem Do Van,
  • Hoang Thi Thanh Thuy,
  • Oi Lun Li,
  • Hoang Anh Pham,
  • Thi-Xuan Chu,
  • Tri Thanh Pham,
  • Trinh Nguyen Thi Thuy,
  • H’Linh Hmŏk,
  • Thi Hinh Dinh,
  • Tu Le Manh

摘要

In this work, electronucleation and growth of Ni-Co (nanoparticles) alloys on a glassy carbon electrode, from various Ni(II):Co(II) ratios (x Ni(II) : (1-x) Co(II), where x is the molar ratio) dissolved in ethylene glycol-based (EG) solutions were studied using electrochemical techniques. UV-vis and DSC measurements were utilized to validate the speciation and stability of the electrolyte solution. Electrochemical studies demonstrated the direct electrodeposition of NiCo alloys from x Ni(II) : (1-x) Co(II) in EG solutions. Analyses of current density transients revealed that the electrodeposition mechanisms and kinetics of Ni-Co alloys could be explained by a model based on 3D nucleation and diffusion-controlled growth of bimetallic nuclei on a growing surface. Surface characterization techniques such as SEM, EDS, XRD, and XPS analysis, along with DFT simulation, confirmed the formation of Ni-Co alloys electrodeposited from EG solutions with anisotropic effect of magnetic properties observed between in-plane and perpendicular fields and the coexistence of both face-centered-cubic and body-centered cubic structure. Furthermore, Ni-Co alloys have demonstrated superior electrocatalytic activity for both hydrogen evolution reaction and the oxygen evolution reaction in 0.5 M KOH with low Tafel slopes.

Graphical abstract