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<p>The alluaudite-type compound Na<sub>3.4</sub>Co<sub>1.3</sub>(MoO<sub>4</sub>)<sub>3</sub> has been successfully synthesized by a solid-state process route. It crystallizes in the monoclinic system (C2/c), cell parameters (Å,°): <i>a</i> = 12.582(5) Å, <i>b</i> = 13.449(8) Å, <i>c</i> = 7.119(7) Å, <i>β</i> = 112.02(4)°, <i>V</i> = 1116.8(14) Å3, and <i>Z</i> = 4. Its crystal structure consists of octahedral [MO<sub>6</sub>] (<i>M</i> = Co, Na) and tetrahedral [MoO<sub>4</sub>] that share corners and/or edges to build the 3D framework. The sample was also characterized by X-ray powder diffraction, which confirmed crystal data, and infrared (FT-IR) and Raman spectroscopies. Its morphology was analyzed using scanning electron microscopy (SEM). The vibrational study confirms the existence of the <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10008_2025_6334_Article_IEq1.gif" Format="GIF" Height="21" Rendition="HTML" Resolution="72" Type="Linedraw" Width="58" /> </InlineMediaObject> <EquationSource Format="TEX">\(Mo{O}_{4}^{2-}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>M</mi> <mi>o</mi> <msubsup> <mi>O</mi> <mrow> <mn>4</mn> </mrow> <mrow> <mn>2</mn> <mo>-</mo> </mrow> </msubsup> </mrow> </math></EquationSource> </InlineEquation> functional groups. The title compound was determined to be paramagnetic. In addition, the compound was characterized by cyclic voltammetry (CV), and its electrochemical performance and impedance were analyzed by electrochemical impedance spectroscopy (EIS). The electrochemical reaction mechanism and the limiting factors of Na<sub>3.4</sub>Co<sub>1.3</sub>(MoO<sub>4</sub>)<sub>3</sub> as electrode material in Na-ion batteries at room temperature were also discussed. The prepared electrocatalyst showed modest hydrogen evolution reaction (HER) performance with an overpotential of 309&#xa0;mV required to afford a current density of 10&#xa0;mA&#xa0;cm<sup>−2</sup>.</p> Graphical Abstract <p></p>

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New alluaudite-type Na3.4Co1.3(MoO4)3 for sodium-ion batteries and electrocatalytic hydrogen evolution

  • 期刊论文

  • 发表日期：

    2025年5月24日

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  • Mohamed Akouibaa,
  • Brahim El Bali,
  • Hicham Oudghiri Hassani,
  • Nicola Morley,
  • Tim Gruene,
  • Mohammed Lachkar,
  • Jack Fitzpatrick,
  • Nuria Tapia-Ruiz,
  • Zeliha Ertekin,
  • Mark D. Symes

摘要

The alluaudite-type compound Na3.4Co1.3(MoO4)3 has been successfully synthesized by a solid-state process route. It crystallizes in the monoclinic system (C2/c), cell parameters (Å,°): a = 12.582(5) Å, b = 13.449(8) Å, c = 7.119(7) Å, β = 112.02(4)°, V = 1116.8(14) Å3, and Z = 4. Its crystal structure consists of octahedral [MO6] (M = Co, Na) and tetrahedral [MoO4] that share corners and/or edges to build the 3D framework. The sample was also characterized by X-ray powder diffraction, which confirmed crystal data, and infrared (FT-IR) and Raman spectroscopies. Its morphology was analyzed using scanning electron microscopy (SEM). The vibrational study confirms the existence of the \(Mo{O}_{4}^{2-}\) M o O 4 2 - functional groups. The title compound was determined to be paramagnetic. In addition, the compound was characterized by cyclic voltammetry (CV), and its electrochemical performance and impedance were analyzed by electrochemical impedance spectroscopy (EIS). The electrochemical reaction mechanism and the limiting factors of Na3.4Co1.3(MoO4)3 as electrode material in Na-ion batteries at room temperature were also discussed. The prepared electrocatalyst showed modest hydrogen evolution reaction (HER) performance with an overpotential of 309 mV required to afford a current density of 10 mA cm−2.

Graphical Abstract