Water-Soluble Salt Template-Assisted Anchor of Hollow FeS2 Nanoparticle Inside 3D Carbon Skeleton to Achieve Fast Potassium-Ion Storage

被引：76

作者：

Cui, Yongpeng ^{[1
]}

Feng, Wenting ^{[1
]}

Wang, Dandan ^{[1
]}

Wang, Yesheng ^{[1
]}

Liu, Wei ^{[2
]}

Wang, Huanlei ^{[2
]}

Jin, Yongcheng ^{[2
]}

Yan, Youguo ^{[1
]}

Hu, Han ^{[1
]}

Wu, Mingbo ^{[1
]}

Xue, Qingzhong ^{[1
]}

Yan, Zifeng ^{[1
]}

Xing, Wei ^{[1
]}

机构：

[1] China Univ Petr East China, State Key Lab Heavy Oil Proc, Sch Mat Sci & Engn, Qingdao 266580, Peoples R China

[2] Ocean Univ China, Sch Mat Sci & Engn, Qingdao 266100, Peoples R China

来源：

ADVANCED ENERGY MATERIALS | 2021年 / 11卷 / 33期

基金：

中国国家自然科学基金; 中国博士后科学基金;

关键词：

carbon skeleton; FeS; (2) nanoparticles; potassium ion storage; salt template; structural engineering; PERFORMANCE; ANODE; NANOCRYSTALS; GRAPHENE;

D O I：

10.1002/aenm.202101343

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：

The rationally structural engineering is an efficient strategy to improve the comprehensive performance of potassium-ion storage anode materials. In this paper, a hybrid with hollow FeS2 nanoparticles anchored into the 3D carbon skeleton (labeled as H-FeS2@3DCS) is successfully constructed through two critical steps of in situ chemical deposition and anion-exchange reaction strategies. In the former, the water-soluble Na2CO3 crystals are used as hard templates for the preparation of 3DCS, while Fe3+-containing aqueous solutions are utilized to remove the Na2CO3 templates. Interestingly, the intense collision between Fe3+ and CO32- in aqueous solution produces nanoscale Fe(OH)(3) colloidal particles, which are firmly anchored into the pores of the carbon skeleton to form a "lotus-seed"-like nanostructure. In the latter case, a central void space is created inside the FeS2 nanoparticles due to the different diffusion rates of S-anions and Fe-cations during the subsequent sulfidation process. Thanks to this unique composition model, the H-FeS2@3DCS hybrid not only alleviates the volume expansion efficiently by rationally hollow structure design, but also provides spacious "roads" (3D carbon skeleton) and "houses" (hollow FeS2 nanoparticles) for fast K-ion transition and storage. As the anode of PIBs and PIHCs, the resultant H-FeS2@3DCS electrode delivers an obviously enhanced K-ions storage performance over state-of-the-art.

引用

页数：12