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Surface-defect engineering of a nickel hexacyanoferrate material for high-performance printed flexible supercapacitors.
- Source :
- Journal of Materials Chemistry A; 2/21/2023, Vol. 11 Issue 7, p3493-3503, 11p
- Publication Year :
- 2023
-
Abstract
- Flexible supercapacitors (FSCs) are considered to be a promising electrochemical energy source for wearable electronic products. However, the absence of high-performance electrode materials and effective manufacturing techniques of devices hinder the volume production of FSCs. Here, a facile surface-etching method is investigated to prepare high-performance nickel hexacyanoferrate (NiHCF) electrode materials, and further, a screen-printing strategy is employed to realize high-volume production of FSCs. Compared with conventional NiHCF electrodes, the Na<subscript>2</subscript>Ni[Fe(CN)<subscript>6</subscript>]-based electrode with surface defect offers a specific capacity of 184 C g<superscript>−1</superscript> (100 C g<superscript>−1</superscript> for conventional NiHCF), and its capacity retention is 91% after 10 000 cycles. According to density functional theory (DFT) calculations, the excellent cycling stability can be attributed to the negligible structural distortion during the Na<superscript>+</superscript> insertion/extraction process (∼6% volume change). Subsequently, symmetric FSCs are constructed by printing the NiHCF electrode materials on flexible PET substrates, displaying excellent areal capacitance of 7.3 mF cm<superscript>−2</superscript> (0.1 mA cm<superscript>−2</superscript>) and energy density and power density of 0.65 μW h cm<superscript>−2</superscript> and 0.4 mW cm<superscript>−2</superscript>, respectively. The surface-defect engineering provides a low-cost strategy to construct nickel hexacyanoferrate materials with outstanding electrochemical properties. The printed electronic techniques we have demonstrated for large-scale and low-cost printing FSCs applications are inspiring. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20507488
- Volume :
- 11
- Issue :
- 7
- Database :
- Complementary Index
- Journal :
- Journal of Materials Chemistry A
- Publication Type :
- Academic Journal
- Accession number :
- 161876586
- Full Text :
- https://doi.org/10.1039/d2ta08043e