Conferring improved specific capacity and stability in heterostructures by built-in electric field as battery-type electrodes for hybrid supercapacitors

被引：0

作者：

Ren, Yuxin ^{[1
]}

Li, Shuang ^{[1
,2
]}

Dai, Lu ^{[1
]}

Wang, Meidi ^{[1
,2
]}

Wu, Ya-Pan ^{[1
,2
]}

Sun, Bojing ^{[1
,2
]}

Hai, Guangtong ^{[3
]}

Wu, Xue-Qian ^{[1
,2
]}

Li, Dong-Sheng ^{[1
,2
]}

机构：

[1] China Three Gorges Univ, Coll Mat & Chem Engn, Key Lab Inorgan Nonmet Crystalline & Energy Conver, Yichang 443002, Peoples R China

[2] Hubei Three Gorges Lab, Yichang 443007, Hubei, Peoples R China

[3] Univ Sci & Technol Beijing, Beijing Adv Innovat Ctr Mat Genome Engn, Sch Mat Sci & Engn, Beijing Key Lab Funct Mat Mol & Struct Construct, Beijing 100083, Peoples R China

来源：

JOURNAL OF POWER SOURCES | 2025年 / 632卷

关键词：

Heterostructure; Interface assembly; Built-in electric field; Hybrid supercapacitors; LAYERED DOUBLE HYDROXIDE; OXYGEN EVOLUTION;

D O I：

10.1016/j.jpowsour.2025.236303

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Coupling layered double hydroxides (LDHs) with functional substrate to construct heterostructures has been proved an effective mean to improve the capacity and stability for LDHs. The optimization of such heterostructures usually focuses on the regulation of chemical components, whereas the ordered assembly of them remains lacking. In this work, NiCo-LDH/Mo2TiC2Tx heterostructures with tight contact interface, acting as the battery-type electrodes for hybrid supercapacitors (HSCs), were successfully prepared by tuning the synthesis temperature. Detailed theory calculations reveal that the integration of NiCo-LDH and Mo2TiC2Tx enhances the overall conductivity, electron transport rate and OH- adsorption capacity, owing to the establishment of a strong built-in electric field at the interface. Besides, the optimized NiCo-LDH/Mo2TiC2Tx-120 degrees C heterostructure consists of in-plane hetero-nanosheets with abundant active sites and short ion diffusion paths. As a result, the NiCo-LDH/Mo2TiC2Tx-120 degrees C electrode exhibits a higher specific capacity (989 C g-1 at 1 A g- 1) and stability than other counterparts. Moreover, the assembled NiCo-LDH/Mo2TiC2Tx-120 degrees C//AC (activated carbon) HSCs achieve a high energy density of 44.7 Wh kg- 1 at a power density of 961 W kg- 1, and a desirable durability of 99.4 % capacity retention after 10000 cycles. This work provides in-depth understanding for the design of highperformance heterostructure for HSCs.

引用

页数：10

共 71 条

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