Fig. 2: Electrochemical performance of Sn₂(dobdc) and Sn₂(dobpdc).

a, b CV curves at 0.1 mV s^–1 of Sn₂(dobdc) and Sn₂(dobpdc). c, d Discharge–charge profiles of Sn₂(dobdc) and Sn₂(dobpdc) in the first five cycles. e, f Rate performance and cycle stability.