[Advanced Materials] 我室陈嘉嘉教授发表论文:POM Anolyte for All-anion Redox Flow Batteries with High Capacity Retention and Coulombic Efficiency at Mild pH

发布日期:2021年12月08日   浏览次数:

我室陈嘉嘉教授在 Advanced Materials 上发表论文:POM Anolyte for All-anion Redox Flow Batteries with High Capacity Retention and Coulombic Efficiency at Mild pH

摘要:A highly soluble and stable Li5BW12O40 cluster delivers 2 e redox reaction with fast electron transfer rates (2.5 * 10−2 cm s−1) and high diffusion coefficients (∼2.08 * 10−6 cm2 s−1) at mild pH ranging from 3 to 8. In-operando aqueous-flowing Raman spectroscopy and DFT calculations reveals that Raman shift changing of {BW12} clusters should be due to the bond length changing between W-Ob-W and W-Oc-W at different redox states of clusters. All above structure changing and redox chemistry of Li5BW12O40 are highly reversible, which makes the Li5BW12O40 cluster versatile to construct all-anion aqueous redox flow batteries at different pH. The cation-exchange Nafion membrane will also repel the cross permeability of the anion redox couples. As a result, by coupling with Li3K[Fe(CN)6] catholyte, the aqueous RFB can be operated at pH 8 with a capacity retention up to 95% and an average Coulombic efficiency (CE) more than 99.79% over 300 cycles within the voltage window ranging from 0 to 1.2 V. Meanwhile, Li5BW12O40 cluster can also be paired with LiI catholyte to form aqueous RFBs at pH 7 and pH 3, the capacity retention of 94% and 90% can be realized over 300 cycles within 0 to 1.3 V.

文章链接:https://onlinelibrary.wiley.com/doi/10.1002/adma.202107425