Crystal structure and hydrogen sorption properties of Nd0.5Y0.5MgNi4-xCox alloys (x = 0–3)

IF 3.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Solid State Sciences Pub Date : 2024-08-30 DOI:10.1016/j.solidstatesciences.2024.107674

Yu Verbovytskyy , Kh Vlad , I. Zavaliy , B. Rożdżyńska-Kiełbik , V. Pavlyuk

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Abstract

The gas-phase and electrochemical hydrogenation properties of Nd_0.5Y_0.5MgNi_4-xCo_x (where x varies from 0 to 3) were studied. Samples were prepared using sintering and annealing procedures. X-ray diffraction analysis indicated that all the alloys were single-phase. The alloys readily absorbed hydrogen, and the crystal structures of the resulting saturated hydrides were refined. Nd_0.5Y_0.5MgNi₄H_4.2 and Nd_0.5Y_0.5MgNi₃CoH_4.4 belong to the NdMgNi₄H_3.6 structural type, while Nd_0.5Y_0.5MgNi₂Co₂H_5.5 and Nd_0.5Y_0.5MgNiCo₃H_6.0 belong to the LaMgNi₄H_4.85 structural type. Electrochemical studies revealed that the maximum discharge capacity of Nd_0.5Y_0.5MgNi_4-xCo_x electrodes increased from 236 mAh/g to 328 mAh/g as the cobalt content increased. The high-rate dischargeability (HRD₁₀₀₀) initially decreased from 48 % to 7 % with increasing cobalt content, but then increased to 32 % at the highest cobalt concentration. Additionally, the electrochemical kinetic properties were determined and compared for these electrodes, including the charge-transfer resistance (R_ct), polarization resistance (R_p), exchange current density (I₀), limiting current density (I_L), and hydrogen diffusion coefficient (D_H).

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Nd0.5Y0.5MgNi4-xCox 合金（x = 0-3 ）的晶体结构和吸氢特性

研究了 Nd0.5Y0.5MgNi4-xCox（其中 x 为 0 至 3）的气相和电化学氢化特性。样品采用烧结和退火程序制备。X 射线衍射分析表明，所有合金都是单相的。合金很容易吸收氢气，由此产生的饱和氢化物的晶体结构也得到了完善。Nd0.5Y0.5MgNi4H4.2 和 Nd0.5Y0.5MgNi3CoH4.4 属于 NdMgNi4H3.6 结构类型，而 Nd0.5Y0.5MgNi2Co2H5.5 和 Nd0.5Y0.5MgNiCo3H6.0 属于 LaMgNi4H4.85 结构类型。电化学研究表明，随着钴含量的增加，Nd0.5Y0.5MgNi4-xCox 电极的最大放电容量从 236 mAh/g 增加到 328 mAh/g。随着钴含量的增加，高速放电率（HRD1000）最初从 48% 降至 7%，但在钴浓度最高时又增至 32%。此外，还测定并比较了这些电极的电化学动力学特性，包括电荷转移电阻 (Rct)、极化电阻 (Rp)、交换电流密度 (I0)、极限电流密度 (IL) 和氢扩散系数 (DH)。

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来源期刊

Solid State Sciences 化学-无机化学与核化学

CiteScore

6.60

自引率

2.90%

发文量

214

审稿时长

27 days

期刊介绍： Solid State Sciences is the journal for researchers from the broad solid state chemistry and physics community. It publishes key articles on all aspects of solid state synthesis, structure-property relationships, theory and functionalities, in relation with experiments. Key topics for stand-alone papers and special issues: -Novel ways of synthesis, inorganic functional materials, including porous and glassy materials, hybrid organic-inorganic compounds and nanomaterials -Physical properties, emphasizing but not limited to the electrical, magnetical and optical features -Materials related to information technology and energy and environmental sciences. The journal publishes feature articles from experts in the field upon invitation. Solid State Sciences - your gateway to energy-related materials.