sc6b03183_si_001.pdf (524.36 kB)
Creating Nitrogen-Doped Hollow Multiyolk@Shell Carbon as High Performance Electrodes for Flow-Through Deionization Capacitors
journal contribution
posted on 2017-03-05, 00:00 authored by Hui Wang, Tingting Yan, Liyi Shi, Guorong Chen, Jianping Zhang, Dengsong ZhangA novel
electrode material for flow-through deionization capacitors
consisting of the hollow multiyolk@shell carbon (HMYSC) with effective
nitrogen doping has been rationally designed and originally prepared
by a template-directed coating method. The HMYSC can be divided into
several hollow carbon spheres cores and the nitrogen-doped shell.
The as-obtained HMYSC shows many favorable features for flow-through
deionization capacitors, such as large specific surface area (910
m2 g–1), hierarchical pores, high conductivity
and good wettability. With the multiple synergistic effects of the
above features, the as-prepared HMYSC electrode has higher specific
capacitance, lower inner resistance and good stability. In the deionization
test, the HMYSC electrode exhibits a high salt adsorption capacity
of 16.1 mg g–1 under the applied voltages of 1.4
V in a 500 mg L–1 NaCl solution. Furthermore, it
has been demonstrated that the HMYSC electrodes presented faster salt
adsorption rate under the applied voltages of 0.8–1.4 V and
in the NaCl solution with the concentration of 100–500 mg L–1. The HMYSC electrodes also exhibits an excellent
regeneration performance in the repeated adsorption–desorption
experiments. The HMYSC developed in this work is promising to be an
effective electrode material for the flow-through deionization capacitors
and other electrochemistry applications.