Pseudocapacitive charge storage at nanoscale silicon electrodes

W. McSweeney, H. Geaney, C. Glynn, D. McNulty, C. O'Dwyer

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Pseudocapacitive behaviour can be accessed when Si nanowire (NW) electrodes are scanned at relatively fast potential scan rates in Li-ion battery electrolytes. Measurements using cyclic voltammetry supported by electron microscopy confirm that Si NWs formed on silicon substrates, as opposed to metallic current collectors, do not solely undergo alloying reactions. The influence of doping type, carrier concentration and bias condition during voltammetric polarization significantly alters the mechanism of electrochemical energy storage. The formation of a carrier depleted (electrically dead) layer of n-type NWs on silicon current collector electrodes limits insertion or alloying processes and rates that ordinarily form Li-Si phases, and charge is also stored within the electric double layer via pseudocapacitive processes. P-type NWs with solid crystalline cores also exhibit pseudocapacitive charge storage without structural modification of the NWs.

Original languageEnglish
Title of host publicationProcesses at the Semiconductor Solution Interface 6
EditorsC. O'Dwyer, D. N. Buckley, A. Etcheberry, A. C. Hillier, R. P. Lynch, P. M. Vereecken, H. Wang, O. M. Leonte
PublisherElectrochemical Society Inc.
Pages39-48
Number of pages10
Edition6
ISBN (Electronic)9781607685968
DOIs
Publication statusPublished - 2015
Externally publishedYes
EventSymposium on Processes at the Semiconductor Solution Interface 6 - 227th ECS Meeting - Chicago, United States
Duration: 24 May 201528 May 2015

Publication series

NameECS Transactions
Number6
Volume66
ISSN (Print)1938-6737
ISSN (Electronic)1938-5862

Conference

ConferenceSymposium on Processes at the Semiconductor Solution Interface 6 - 227th ECS Meeting
Country/TerritoryUnited States
CityChicago
Period24/05/1528/05/15

Fingerprint

Dive into the research topics of 'Pseudocapacitive charge storage at nanoscale silicon electrodes'. Together they form a unique fingerprint.

Cite this