Volume 137, Issue 9 e202420794
Forschungsartikel

In-Situ Constructed Core-Shell Catalyst Enabling Subzero Capacity Unlocking of Cost-Effective and Long-Life Vanadium Flow Batteries

Yizhe Nie

Yizhe Nie

Institute of Materials Research, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055 China

Contribution: Conceptualization (equal), ​Investigation (lead), Methodology (lead), Writing - original draft (lead)

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Rui Nie

Rui Nie

Institute of Materials Research, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055 China

Contribution: ​Investigation (supporting)

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Hao Lin

Hao Lin

Institute of Materials Research, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055 China

Shenzhen Engineering Research Laboratory for Sludge and Food Waste Treatment and Resource Recovery, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055 China

Contribution: ​Investigation (supporting), Methodology (equal)

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Jiajun Wu

Jiajun Wu

Institute of Materials Research, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055 China

Contribution: ​Investigation (supporting)

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Dr. Lihong Yu

Dr. Lihong Yu

School of Materials and Environmental Engineering, Shenzhen Polytechnic University, Shenzhen, 518055 China

Contribution: Conceptualization (equal), Supervision (equal), Writing - review & editing (equal)

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Prof. Dr. Le Liu

Prof. Dr. Le Liu

Institute of Materials Research, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055 China

Contribution: Methodology (lead)

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Prof. Dr. Jingyu Xi

Corresponding Author

Prof. Dr. Jingyu Xi

Institute of Materials Research, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055 China

Contribution: Conceptualization (lead), Supervision (lead), Writing - review & editing (lead)

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First published: 17 December 2024
Citations: 2

Abstract

Vanadium flow battery (VFB) promises a route for achieving grid-scale power storage by harnessing renewable energy sources. However, the sluggish reaction kinetics of vanadium redox couples and serious hydrogen evolution reaction (HER) still restrict the further development of VFB. Addressing these challenges requires not only effective solutions but also ones that are cost-efficient and scalable to meet the demands of affordable energy storage. Here, we present an in situ constructed Cu@Cu6Sn5 core-shell catalyst by incorporating metal ions into the electrolyte. The Cu core, encapsulated by the Cu6Sn5 shell, forms an excellent conductive pathway to the graphite felt electrode. Charge transfer between Cu and Sn within Cu6Sn5 shell accelerates the reaction kinetics of V2+/V3+ redox couple and selectively inhibits HER, as confirmed through in situ weak measurement imaging method. The Cu@Cu6Sn5 battery achieves a peak power density of 1119.1 mW cm−2 at 1350 mA cm−2, operates stably for 1200 cycles without catalyst failure, and is available over a wide-temperature range. Furthermore, we identify a demand of subzero capacity unlocking. Achieving a 23.4 % theoretical capacity unlocking at −10 °C with a cut-off voltage up to 1.75 V, bespeaking a crucial breakthrough toward cost-effective VFB.

Conflict of Interests

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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