Mesoporous dominated porous carbon with high nitrogen and phosphorus doping levels toward high area capacity zinc-iodine batteries

被引:0
作者
Hou, Yutong [1 ]
Wei, Lishan [1 ,2 ]
Sun, Nan [1 ,2 ]
Yu, Dengfeng [3 ]
Zhao, Gongyuan [1 ,2 ]
机构
[1] Northeast Forestry Univ, Coll Chem Chem Engn & Resource Utilizat, 26 Hexing Rd, Harbin 150040, Peoples R China
[2] Northeast Forestry Univ, Ctr Innovat Res Synthet Chem & Resource Utilizat, Harbin 150040, Peoples R China
[3] Tsinghua Univ, Sch Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China
关键词
N/P co-doped; Zinc-iodide batteries; High area specific capacity; Porous carbon; PERFORMANCE; ADSORPTION;
D O I
10.1016/j.est.2025.116495
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
The synthesis of porous carbon materials as host materials to adsorb iodine solely through a high density of micropores is insufficient to meet the demands of high-performance aqueous zinc-iodine batteries (AZIBs). To address this limitation, we designed a nitrogen-phosphorus co-doped hierarchical porous carbon (NP-HPC) with mesopore dominance and high phosphorus doping levels (8.52 % nitrogen and 6.64 % phosphorus) using a sol carbonization strategy. Specifically, the abundant mesopores are conducive to promoting rapid mass transfer at the solid-liquid interface and enabling the electrolyte to reach the inaccessible micropore. The synergistic effect of special pore structure and high nitrogen and phosphorus doping levels in NP-HPC makes it a promising host to confine iodine tightly. Furthermore, the density functional theory calculations (DFT) results reveal that N, P codoping enhances nitrogen atom charge accumulation, improves carbon skeleton zinc adsorption capacity, and provides extra pseudo capacity for AZIB. Therefore, the optimized NP-HPC-assembled AZIBs exhibited an excellent discharge-specific capacity of 123.4 mAh g- 1 at 0.1 A g- 1 with a high iodine loading of 13.25 mg cm-2 and a capacity retention of 90 % after 1000 cycles at 1.0 A g- 1. This study not only presents insights into the design of porous carbon with high heteroatom doping level, but also proposes a novel approach for achieving high area-specific capacity AZIBs.
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页数:11
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