Work

Structural and electrochemical insights into potassium niobium oxides from a secondary source

Year: 2025

Type: article

Abstract: High-power alkali metal-ion batteries and capacitors are critical for advanced technologies such as electric vehicles. Niobium-based oxides have emerged as promising candidates for high-rate anodes in these energy storage systems. In this study, we conducted an initial feasibility assessment of potassium niobium oxides as potential anode materials . The starting material for growing these oxides was niobic acid with K 2 SO 4 on its surface, obtained through a viable and sustainable route using Fe-Nb alloy fines. The potassium niobium oxides were characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM), and micro-Raman spectroscopy techniques . Our results confirm that the crystals exhibit pseudo-tetragonal and tetragonal tungsten bronze-like structures. Preliminary electrochemical characterization indicated promising behavior, particularly for samples with pseudo-tetragonal tungsten bronze-like structures, as evidenced by reversible redox peaks in cyclic voltammetry . These findings highlight the potential of potassium niobium oxides for high-rate energy storage applications, warranting further investigation to optimize their performance and scalability. This work serves as an initial feasibility study , laying the groundwork for future research in this area.

Source: Ceramics International

DOI: 10.1016/j.ceramint.2025.04.257

Authors: Gabriela Cordeiro Silva, Ana Clara Aparecida Reis, Paulo Renato Perdigão Paiva, Cássia Ribeiro Souza, Décio Batista de Freitas Neto, Sônia Denise Ferreira Rocha

Institutions: Universidade Federal de Minas Gerais, Federal Center for Technological Education of Minas Gerais

Language: English

Topic: Advancements in Battery Materials

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: hybrid

Estimated APC paid: $3,830