RT Journal Article
T1 Tunable Supercapacitor Materials Derived from Hydrochar/Gold Nanograpes
A1 Arenas Esteban, Daniel
A1 Guerrero Martínez, Andrés
A1 Carretero González, Javier
A1 Birss, Viola
A1 Otero Díaz, Luis Carlos
A1 Ávila Brande, David
AB Since electrode materials play a crucial role in the performance of supercapacitors, the design of architectures based on carbon nanocomposites can enhance the electrochemical performance based on the synergistic effect between the components. Here, we have devised a facile synthetic route for the preparation of a C/Au nanocomposite, denoted as carbon/gold nanograpes (C/Au NGs), based on the hydrothermal polymerization of glucose-stabilized gold nanoparticles. Carbonization/activation of the C/Au NGs at 500 °C yields microporous carbon nanospheres containing several Au nanoparticles, giving a high volumetric capacitance. However, this volumetric capacitance suffers a dramatic drop at fast charge/discharge rates. When heating the C/Au NGs at 700 °C, the Au nanoparticles melt and flow out of the carbon nanospheres, altering the micropore structure of the C/Au NGs shells, and recrystallize at the surface, while some nanoclusters containing only a few Au atoms remained homogeneously dispersed within the pore network of the carbon shell. These nanostructural changes result in an increase in the ionic transport rates across the carbon shell as well as a lowering of the resistance, thus increasing the volumetric capacitance in aqueous acidic solutions and showing a remarkable improvement in the capacitance retention.
PB ACS
YR 2020
FD 2020-08-19
LK https://hdl.handle.net/20.500.14352/125232
UL https://hdl.handle.net/20.500.14352/125232
LA eng
NO 1.Esteban DA, Andrés Guerrero Martínez, González JC, Birss VI, Otero-Díaz LC, Brande DÁ. Tunable Supercapacitor Materials Derived from Hydrochar/Gold Nanograpes. ACS Applied Energy Materials. 2020 Aug 19;3(9):9348–59. ‌
NO MCIN/AEI
DS Docta Complutense
RD 17 mar 2026