Abstract
The balancing of the electrochemical perfor-mance,mechanical stability,and processing technology for applying supercapacitors to flexible and wearable elec-tronics continues to encounter severe challenges.Herein,we prepare Ni-Co-Mn hydroxide electrodes with a three-dimensional multichannel structure via a simple hydrothermal method.These are constructed using verti-cally contiguous nanosheets with a uniform thickness and rough surface.The electrodes can provide numerous elec-troactive sites and accelerate the transmission of electrolyte ions.The relationship between the structure and electro-chemical performances is verified by experiments and theoretical calculations.Two-dimensional(2D)planar and one-dimensional(1D)fiber electrodes are prepared using a flexible carbon cloth(CC)and carbon fiber(CF),respec-tively,as substrates.The assembled quasi-solid-state flex-ible asymmetric supercapacitor(FASC)with a two-dimensional sandwich structure using NiCoMn-OH/CC as the electrode achieves a remarkable energy density of 73.8 Wh·kg-1 at a power density of 1.03 kW·kg-1.The quasi-solid-state FASC with a 1D linear structure using NiCoMn-OH/CF as the electrode also attains a high energy density(12.9 Wh·kg-1 at a power density of 0.75 W·kg-1).Moreover,the electrochemical perfor-mances of the NiCoMn/CC//AC/CC and NiCoMn/CF//AC/CF FASCs are not disturbed at different bending angles(0°,45°,90°,135° and 180°).This indicates the superior flexibility of the devices.We also assemble a self-powered energy-harvesting storage system by integrating FASCs and commercial solar cells to verify its practicability.It displays sustainable development potential for energy storage.
基金项目
Tianjin Municipal Education Commission Scientific Research Project(2018KJ151)
National Natural Science Foundation of China(51773094)
Tianjin Research Innovation Project for Postgraduate Students(2021YJSB245)
NETL
NSTL
万方数据