A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Constructing pseudocapacitive electrodes for supercapacitors based on rationally designed nanoarchitectured current collectors
Supercapacitors are of high importance as electrochemical energy storage devices attributing to their outstanding power performance, excellent reversibility and long cycle life. However, compared with batteries, supercapacitors suffer from low energy density, which hinders their wide application. Pseudocapacitive materials with a high theoretical capacitance hold a great promise in boosting the energy storage capability for supercapacitors. Research on nanoarchitectured current collectors aims to reach their full potential in the field of charge storage by addressing challenging problems such as the inherently low electrical conductivity and the sluggish charge and discharge behavior of most pseudo-capacitive materials. In this regard, three kinds of nanoarchitectured current collectors, i.e., Ni nanorod arrays (NN), etched porous alumina membrane (EPAM) coated with SnO2 layer (EPAM@SnO2), and Ni nanowires confined into EPAM (NiNWs-EPAM), were designed to construct pseudocapacitive electrodes and they were investigated in different aspects: Firstly, the role of NN nanoarchitectured current collectors in supercapacitor electrodes with the pseudocapacitive materials in the case of high mass loading and thick layer is firstly evaluated. Through electrochemical performance and impedance analysis of the electrodes with and without the NN nanoarchitectured current collectors, the validation of thick-layer electrodes design based on nanoarchitectured current collectors is demonstrated. Secondly, EPAM@SnO2 scaffolds are designed and employed as nanoarchitectured current collectors for nanoelectrodes in order to improve the device energy density of the micro-supercapacitor (MSC). Owing to the oriented and robust nanochannels in EPAM@SnO2, the resultant nanoelectrodes can synergize both effective ion migration and abundant electroactive surface area within the limited footprint. A MSC is finally constructed and exhibits record high performance, suggesting the feasibility of the current design for energy storage devices. ...
Constructing pseudocapacitive electrodes for supercapacitors based on rationally designed nanoarchitectured current collectors
Supercapacitors are of high importance as electrochemical energy storage devices attributing to their outstanding power performance, excellent reversibility and long cycle life. However, compared with batteries, supercapacitors suffer from low energy density, which hinders their wide application. Pseudocapacitive materials with a high theoretical capacitance hold a great promise in boosting the energy storage capability for supercapacitors. Research on nanoarchitectured current collectors aims to reach their full potential in the field of charge storage by addressing challenging problems such as the inherently low electrical conductivity and the sluggish charge and discharge behavior of most pseudo-capacitive materials. In this regard, three kinds of nanoarchitectured current collectors, i.e., Ni nanorod arrays (NN), etched porous alumina membrane (EPAM) coated with SnO2 layer (EPAM@SnO2), and Ni nanowires confined into EPAM (NiNWs-EPAM), were designed to construct pseudocapacitive electrodes and they were investigated in different aspects: Firstly, the role of NN nanoarchitectured current collectors in supercapacitor electrodes with the pseudocapacitive materials in the case of high mass loading and thick layer is firstly evaluated. Through electrochemical performance and impedance analysis of the electrodes with and without the NN nanoarchitectured current collectors, the validation of thick-layer electrodes design based on nanoarchitectured current collectors is demonstrated. Secondly, EPAM@SnO2 scaffolds are designed and employed as nanoarchitectured current collectors for nanoelectrodes in order to improve the device energy density of the micro-supercapacitor (MSC). Owing to the oriented and robust nanochannels in EPAM@SnO2, the resultant nanoelectrodes can synergize both effective ion migration and abundant electroactive surface area within the limited footprint. A MSC is finally constructed and exhibits record high performance, suggesting the feasibility of the current design for energy storage devices. ...
Constructing pseudocapacitive electrodes for supercapacitors based on rationally designed nanoarchitectured current collectors
Liu, Long (author) / Lei, Yong / Jacobs, Heiko O. / Yang, Dongjiang
2020-12-15
Theses
Electronic Resource
English
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