Lanthanum-substituted CaMo-MOF via controlled metal nitrate ratios for Electrochemical Performance

IF 6.1 1区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

GIANT Pub Date : 2025-12-01 Epub Date: 2025-10-31 DOI:10.1016/j.giant.2025.100380

P. Arularasan , Mohd Arif Dar , Mohammad Rezaul Karim , P Rajesh , M Pavithra , Sambasivam Sangaraju

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Abstract

In this study, a series of La_xCa_1-xMo-based metal-organic frameworks (MOFs), designated as CML1, CML2, CML3 and CML4, were synthesized via a controlled precipitation method. A comprehensive characterization was performed using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy and X-ray photoelectron spectroscopy (XPS). The XRD confirmed the formation of a single-phase tetragonal scheelite-type structure (I4₁/a), with no secondary phases detected. The average crystallite size is found to be 54, 52, 42 and 16 (nm) in CML1, CML2, CML3 and CML4 MOFs. The SEM reveals a morphological evolution from irregular granules in CML1 to well-faceted rods in CML4 MOFs. The electrochemical analysis revealed a clear performance hierarchy, with CML3 electrode exhibiting the highest the specific capacitance in a two-electrode system. The coulombic efficiency of 96 % is retained by the CML3 electrode even after 1000 GCD cycles in a two-electrode system.

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镧取代CaMo-MOF的电化学性能研究

本研究采用可控沉淀法合成了一系列基于laxca1 - xmo的金属有机骨架（mof），编号为CML1、CML2、CML3和CML4。利用x射线衍射（XRD）、傅里叶变换红外光谱（FTIR）、拉曼光谱（Raman）和x射线光电子能谱（XPS）对其进行了综合表征。XRD证实形成了单相四方白钨矿型结构（I4 1 /a），未检测到二次相。CML1、CML2、CML3和CML4 MOFs的平均晶粒尺寸分别为54,52,42和16 nm。扫描电镜显示了CML1的不规则颗粒到CML4的光滑棒状mof的形态演变。电化学分析表明，CML3电极在两电极体系中表现出最高的比电容。在双电极系统中，CML3电极在1000 GCD循环后仍保持96%的库仑效率。

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来源期刊

GIANT Multiple-

CiteScore

8.50

自引率

8.60%

发文量

审稿时长

42 days

期刊介绍： Giant is an interdisciplinary title focusing on fundamental and applied macromolecular science spanning all chemistry, physics, biology, and materials aspects of the field in the broadest sense. Key areas covered include macromolecular chemistry, supramolecular assembly, multiscale and multifunctional materials, organic-inorganic hybrid materials, biophysics, biomimetics and surface science. Core topics range from developments in synthesis, characterisation and assembly towards creating uniformly sized precision macromolecules with tailored properties, to the design and assembly of nanostructured materials in multiple dimensions, and further to the study of smart or living designer materials with tuneable multiscale properties.