Metal ratio-mediated phase selectivity in cobalt to vanadium compounds: From single-metal sulfides to bimetallic oxide frameworks for energy applications

บทความในวารสาร

ผู้เขียน/บรรณาธิการ

กลุ่มสาขาการวิจัยเชิงกลยุทธ์

รายละเอียดสำหรับงานพิมพ์

รายชื่อผู้แต่ง: Kuo, T.-R.; Tsia, M.-H.; Fa, D.-S.; Kongvarhodom, C.; Saukani, M.; Yougbaré, S.; Chen, H.-M.; Lin, L.-Y.

ปีที่เผยแพร่ (ค.ศ.): 2025

Volume number: 50

หน้าแรก: 103190

นอก: 24685194

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-105020776339&doi=10.1016%2Fj.mtchem.2025.103190&partnerID=40&md5=590fe8c6ca2ac770ab04ff9d1015568c

ภาษา: English-Great Britain (EN-GB)

ดูบนเว็บไซต์ของสำนักพิมพ์

บทคัดย่อ

Cobalt-based materials have been widely explored for battery-supercapacitor hybrids (BSHs) due to their high theoretical capacitance and multiple accessible redox states, but poor conductivity and rate performance remain challenges. Vanadium with multiple oxidation states offers potential to complement cobalt by enhancing redox kinetics and expanding phase tunability. Synergistic effects introduced by forming cobalt-vanadium bimetallic systems are expected to improve charge transport, structural stability, and electrochemical reversibility. However, the influence of metal ratios on charge storage mechanisms remains insufficiently explored. In this study, cobalt-vanadium compounds with varied metal ratios are designed to investigate effects on morphology, phase composition, and electrochemical behavior. The electrode with cobalt-to-vanadium ratio of 2:2 (CoV22) achieves the highest specific capacitance (CF) of 984.4 F/g at 1 A/g, attributed to its particle-assembled hollow sphere structure that facilitates ion transport and provides abundant surface-active sites. Kinetic analysis is conducted to reveal capacitive-controlled and diffusion-controlled charge storage behaviors. A BSH composed of CoV22 and carbon electrodes achieves a maximum energy density of 10.7 Wh/kg at 600 W/kg, and a CF retention of 87% and Coulombic efficiency of 91% after 10,000 cycles. These results emphasize the critical role of metal ratio tuning in optimizing both redox mechanisms and practical device performance. © 2025 Elsevier Ltd

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