Asymmetric Supercapacitor Based on a 1D Cu-Coordination Polymer with High Cycle Stability

It is a considerably attractive task to search for new high-performance electrode materials for supercapacitors from pristine coordination polymers. Herein, a one-dimensional (1D) Cu-based coordination polymer ([Cu(BGPD)(DMF)2(H2O)], Cu-BGPD; BGPD = N,N′-bis(glycinyl)pyromellitic diimide; DMF = dimethylformamide) has been synthesized. When utilized as the electrode material for supercapacitors, in a three-electrode system, the Cu-BGPD electrode delivers a high specific capacitance of 1530 F g–1 (corresponding to a specific capacity of 213 mAh g–1) at 1 A g–1 with a capacitance retention of 95.9% after 2000 cycles at 1 A g–1. Impressively, the asymmetric supercapacitor comprising Cu-BGPD as the positive electrode and the rGO as the negative electrode delivers the maximum energy density of 15.25 Wh kg–1 at a power density of 0.85 kW kg–1. Our research shows that it is also a practical way to develop new high-performance electrode materials of supercapacitors from 1D coordination polymers

In-Situ Grafting MPEG on the Surface of Cell-Loaded Microcapsules for Protein Repellency

<div><p>The protein repelled alginate-graft-BAT/chitosan/MPEG-norbornene (A_BCP_N) hydrogel microcapsules were achieved by copper-free ‘click’ reaction between azides from BAT and alkylenes from norbornene. The MPEG modified polyelectrolyte microcapsules showed significant resistance to immune protein adsorption and good biocompatibility in vivo. Moreover, the mild reaction condition made it feasible that the microcapsules could be formed and modified <i>in situ</i> even when live cells were encapsulated, and precluded the damage cause by other voilent modifications methods to transplanted cells or tissues.</p></div