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<p>Designing high-performance pseudocapacitor materials demands precise control over structural distortion, electronic transport, and interfacial dynamics. In this work, we present an In<sup>3+</sup>-doping strategy in BiFeO<sub>3</sub> (BiFe<sub>1−<i>x</i></sub>In<sub><i>x</i></sub>O<sub>3</sub>; 0 ≤ <i>x</i> ≤ 0.25) to modulate crystallographic symmetry, reduce particle size, and enhance ion/electron mobility, targeting its application as a supercapacitor electrode. The aliovalent substitution induces a structural phase transition, lattice distortion, and oxygen vacancy formation, collectively optimizing charge storage behaviour. As a result, the optimized composition (<i>x</i> = 0.15) exhibits a remarkable specific capacitance of 275.54 F/g at 2 A/g from GCD and 211.07 F/g at 10&#xa0;mV/s from CV analysis, alongside an energy density of 49.06 Wh/kg and power density of 3968 W/kg, outperforming undoped and over-doped counterparts. Electrochemical impedance analysis confirms reduced charge transfer resistance and superior ion diffusion kinetics, affirming the effectiveness of defect-mediated tuning. This study provides critical insights into structure-defect-performance coupling in perovskites and opens a practical route for engineering next-generation oxide-based energy storage materials with tailored electrochemical responses.</p>

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Defect-engineered BiFe1−xInxO3 nanoparticles via aliovalent doping for high-performance supercapacitor electrodes

  • 期刊论文

  • 发表日期：

    2025年8月23日

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  • Ritisnigdha Das,
  • Anjali Rajesh Shelake,
  • Shree Kesavan Kannan,
  • Chandra Sekhar Dash,
  • S. Sathish,
  • M. Sundararajan,
  • S. Yuvaraj

摘要

Designing high-performance pseudocapacitor materials demands precise control over structural distortion, electronic transport, and interfacial dynamics. In this work, we present an In3+-doping strategy in BiFeO3 (BiFe1−xInxO3; 0 ≤ x ≤ 0.25) to modulate crystallographic symmetry, reduce particle size, and enhance ion/electron mobility, targeting its application as a supercapacitor electrode. The aliovalent substitution induces a structural phase transition, lattice distortion, and oxygen vacancy formation, collectively optimizing charge storage behaviour. As a result, the optimized composition (x = 0.15) exhibits a remarkable specific capacitance of 275.54 F/g at 2 A/g from GCD and 211.07 F/g at 10 mV/s from CV analysis, alongside an energy density of 49.06 Wh/kg and power density of 3968 W/kg, outperforming undoped and over-doped counterparts. Electrochemical impedance analysis confirms reduced charge transfer resistance and superior ion diffusion kinetics, affirming the effectiveness of defect-mediated tuning. This study provides critical insights into structure-defect-performance coupling in perovskites and opens a practical route for engineering next-generation oxide-based energy storage materials with tailored electrochemical responses.