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Three‐Phase Boundary in Cross‐Coupled Micro‐Mesoporous Networks Enabling 3D‐Printed and Ionogel‐Based Quasi‐Solid‐State Micro‐Supercapacitors
Author(s) -
Lai Feili,
Yang Chao,
Lian Ruqian,
Chu Kaibin,
Qin Jingjing,
Zong Wei,
Rao Dewei,
Hofkens Johan,
Lu Xihong,
Liu Tianxi
Publication year - 2020
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.202002474
Subject(s) - supercapacitor , materials science , mesoporous material , gravimetric analysis , capacitance , electrolyte , quasi solid , nanocomposite , chemical engineering , nanotechnology , ionic liquid , fabrication , electrode , nanoparticle , phase (matter) , organic chemistry , chemistry , catalysis , medicine , alternative medicine , engineering , pathology , dye sensitized solar cell
The construction of advanced micro‐supercapacitors (MSCs) with both wide working‐voltage and high energy density is promising but still challenging. In this work, a series of nitrogen‐doped, cross‐coupled micro‐mesoporous carbon–metal networks (N‐STC/M x O y ) is developed as robust additives to 3D printing inks for MSCs fabrication. Taking the N‐STC/Fe 2 O 3 nanocomposite as an example, both experimental results and theoretical simulations reveal that the well‐developed hierarchical networks with abundantly decorated ultrafine Fe 2 O 3 nanoparticles not only significantly facilitate the ion adsorption at its three‐phase boundaries (Fe 2 O 3 , N‐STC, and electrolyte), but also greatly favor ionic diffusion/transport with shortened pathways. Consequently, the as‐prepared N‐STC/Fe 2 O 3 electrode delivers a high gravimetric capacitance (267 F g −1 at 2 mV s −1 ) and outstanding stability in a liquid‐electrolyte‐based symmetric device, as well as a record‐high energy density of 114 Wh kg −1 for an asymmetric supercapacitor. Particularly, the gravimetric capacitance of the ionogel‐based quasi‐solid‐state MSCs by 3D printing reaches 377 F g −1 and the device can operate under a wide temperature range (−10 to 60 °C).