期刊
ENERGY & ENVIRONMENTAL SCIENCE
卷 6, 期 1, 页码 225-231出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2ee23707e
关键词
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资金
- Fluid Interface Reactions, Structures and Transport (FIRST), a National Laboratory Energy Frontier Research Center
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences
- Center for Nanophase Materials Sciences
- Oak Ridge National Laboratory by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy
- German Federal Ministry for Research and Education (BMBF)
- nanoEES3D project [03EK3013]
Electrochemical double layer capacitors (EDLC) are rapidly emerging as a promising energy storage technology offering extremely large power densities. Despite significant experimental progress, nanoscale operation mechanisms of the EDLCs remain poorly understood and it is difficult to separate processes at multiple time and length scales involved in operation including that of double layer charging and ionic mass transport. Here we explore the functionality of EDLC microporous carbon electrodes using a combination of classical electrochemical measurements and scanning probe microscopy based dilatometry, thus separating individual stages in charge/discharge processes based on strain generation. These methods allowed us to observe two distinct modes of EDLC charging, one fast charging of the double layer unassociated with strain, and another much slower mass transport related charging exhibiting significant sample volume changes. These studies open the pathway for the exploration of electrochemical systems with multiple processes involved in the charge and discharge, and investigation of the kinetics of those processes.
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