Revealing Asymmetric Phase Transformation of the BiVO4 Anodes for Potassium-Ion Batteries by In Situ Transmission Electron Microscopy
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
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Detail(s)
Original language | English |
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Pages (from-to) | 55490-55501 |
Journal / Publication | ACS Applied Materials & Interfaces |
Volume | 16 |
Issue number | 41 |
Online published | 5 Oct 2024 |
Publication status | Published - 16 Oct 2024 |
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Abstract
Potassium-ion batteries (PIBs) have emerged as a promising alternative to lithium-ion batteries (LIBs), thanks to the cost-effectiveness of potassium resources and a favorable redox potential of approximately −2.936 V. The monoclinic BiVO4, known for its layered structure, shows noteworthy electrochemical properties when utilized as an anode material for both LIBs and sodium-ion batteries. However, the fundamental electrochemical reaction mechanisms of the BiVO4 anode during the potassium insertion/extraction processes remain unclear. Here, we constructed a BiVO4 anode PIB inside the transmission electron microscope (TEM) to explore the real-time potassiation/depotassiation behaviors of BiVO4 during electrochemical cycling. Utilizing the state-of-art in situ TEM technique, the BiVO4 nanorods are found to undergo an asymmetric phase transformation for the first time, where the pristine BiVO4 material is transformed into an amorphous KxBiVO4 phase after the first cycle. More interestingly, the anode materials near and far from the potassium source exhibit opposite volume-changing trends under the same voltage potential. Also, this phenomenon should be attributed to the mass flow of the unstable K−Bi alloy under the electric field. Our findings provide significant insights into the electrochemical mechanism of BiVO4 nanorods during the potassiation/depotassiation process, with the hope of assistance in designing anodes for high-performance PIBs. © 2024 American Chemical Society.
Research Area(s)
- potassium-ion batteries, in situ TEM, BiVO4 anode, potassiationand depotassiation, asymmetric phase transformation
Citation Format(s)
Revealing Asymmetric Phase Transformation of the BiVO4 Anodes for Potassium-Ion Batteries by In Situ Transmission Electron Microscopy. / An, Quan; Zhang, Wenqi; Ma, Zelin et al.
In: ACS Applied Materials & Interfaces, Vol. 16, No. 41, 16.10.2024, p. 55490-55501.
In: ACS Applied Materials & Interfaces, Vol. 16, No. 41, 16.10.2024, p. 55490-55501.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review