Aqueous zincion capacitors(ZICs)have significant potential as energy storage systems because of their high specific capacity and superior reliability.Heteroatom-doped carbon materials were known to substantially incre...Aqueous zincion capacitors(ZICs)have significant potential as energy storage systems because of their high specific capacity and superior reliability.Heteroatom-doped carbon materials were known to substantially increase the capacitance of ZICs,however the mechanism remains poorly understood.Coal-based activated carbon was functionalized with B and N to serve as the cathode material in ZICs.This modification gave the material a high specific capacity of 371.4 mAh g^(-1)at 1 A g^(-1)and it retained 74%of its initial capacity after 10000 cycles.Experimental results and density functional theory calculations revealed that pyridinic N plays a crucial role in increasing Zn^(2+)storage,demonstrating superior electrochemical reversibility.This work gives valuable insight into the design of high-capacity and ultrafast pseudocapacitive carbon cathodes for ZICs.展开更多
基金supported by National Natural Science Foundation of China(52202051)the Key Research and Development(R&D)Projects of Shanxi Province(202202040201005)。
文摘Aqueous zincion capacitors(ZICs)have significant potential as energy storage systems because of their high specific capacity and superior reliability.Heteroatom-doped carbon materials were known to substantially increase the capacitance of ZICs,however the mechanism remains poorly understood.Coal-based activated carbon was functionalized with B and N to serve as the cathode material in ZICs.This modification gave the material a high specific capacity of 371.4 mAh g^(-1)at 1 A g^(-1)and it retained 74%of its initial capacity after 10000 cycles.Experimental results and density functional theory calculations revealed that pyridinic N plays a crucial role in increasing Zn^(2+)storage,demonstrating superior electrochemical reversibility.This work gives valuable insight into the design of high-capacity and ultrafast pseudocapacitive carbon cathodes for ZICs.
