Ni- and Sn-based Colloidal Nanoparticles for Electrochemical Energy Technologies

Programa de Doctorat Nanociències / Tesi realitzada a l'Institut de Recerca en Energia de Catalunya (IREC)

Detalles Bibliográficos
Autor: Li, Junshan
Tipo de recurso: tesis doctoral
Estado:Versión publicada
Fecha de publicación:2019
País:España
Institución:CBUC, CESCA
Repositorio:TDR. Tesis Doctorales en Red
OAI Identifier:oai:www.tdx.cat:10803/667475
Acceso en línea:http://hdl.handle.net/10803/667475
Access Level:acceso abierto
Palabra clave:Nanociència
Nanociencia
Nanoscience
Col·loides
Coloides
Colloids
Electroquímica
Electrochemistry
Conversió directa de l'energia
Conversión directa de la energía
Direct energy conversion
Interfícies (Ciències físiques)
Interfases (Ciencias físicas)
Interfaces (Physical sciences)
Ciències Experimentals i Matemàtiques
53
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network_name_str España
repository_id_str
dc.title.none.fl_str_mv Ni- and Sn-based Colloidal Nanoparticles for Electrochemical Energy Technologies
title Ni- and Sn-based Colloidal Nanoparticles for Electrochemical Energy Technologies
spellingShingle Ni- and Sn-based Colloidal Nanoparticles for Electrochemical Energy Technologies
Li, Junshan
Nanociència
Nanociencia
Nanoscience
Col·loides
Coloides
Colloids
Electroquímica
Electrochemistry
Conversió directa de l'energia
Conversión directa de la energía
Direct energy conversion
Interfícies (Ciències físiques)
Interfases (Ciencias físicas)
Interfaces (Physical sciences)
Ciències Experimentals i Matemàtiques
53
title_short Ni- and Sn-based Colloidal Nanoparticles for Electrochemical Energy Technologies
title_full Ni- and Sn-based Colloidal Nanoparticles for Electrochemical Energy Technologies
title_fullStr Ni- and Sn-based Colloidal Nanoparticles for Electrochemical Energy Technologies
title_full_unstemmed Ni- and Sn-based Colloidal Nanoparticles for Electrochemical Energy Technologies
title_sort Ni- and Sn-based Colloidal Nanoparticles for Electrochemical Energy Technologies
dc.creator.none.fl_str_mv Li, Junshan
author Li, Junshan
author_facet Li, Junshan
author_role author
dc.contributor.none.fl_str_mv Cabot i Codina, Andreu
Pérez Rodríguez, Alejandro
Universitat de Barcelona. Facultat de Física
dc.subject.none.fl_str_mv Nanociència
Nanociencia
Nanoscience
Col·loides
Coloides
Colloids
Electroquímica
Electrochemistry
Conversió directa de l'energia
Conversión directa de la energía
Direct energy conversion
Interfícies (Ciències físiques)
Interfases (Ciencias físicas)
Interfaces (Physical sciences)
Ciències Experimentals i Matemàtiques
53
topic Nanociència
Nanociencia
Nanoscience
Col·loides
Coloides
Colloids
Electroquímica
Electrochemistry
Conversió directa de l'energia
Conversión directa de la energía
Direct energy conversion
Interfícies (Ciències físiques)
Interfases (Ciencias físicas)
Interfaces (Physical sciences)
Ciències Experimentals i Matemàtiques
53
description Programa de Doctorat Nanociències / Tesi realitzada a l'Institut de Recerca en Energia de Catalunya (IREC)
publishDate 2019
dc.date.none.fl_str_mv 2019
2019
2019
dc.type.none.fl_str_mv info:eu-repo/semantics/doctoralThesis
info:eu-repo/semantics/publishedVersion
format doctoralThesis
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10803/667475
url http://hdl.handle.net/10803/667475
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.rights.none.fl_str_mv http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 184 p.
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Universitat de Barcelona
publisher.none.fl_str_mv Universitat de Barcelona
dc.source.none.fl_str_mv TDX (Tesis Doctorals en Xarxa)
reponame:TDR. Tesis Doctorales en Red
instname:CBUC, CESCA
instname_str CBUC, CESCA
reponame_str TDR. Tesis Doctorales en Red
collection TDR. Tesis Doctorales en Red
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869410934337830912
spelling Ni- and Sn-based Colloidal Nanoparticles for Electrochemical Energy TechnologiesLi, JunshanNanociènciaNanocienciaNanoscienceCol·loidesColoidesColloidsElectroquímicaElectrochemistryConversió directa de l'energiaConversión directa de la energíaDirect energy conversionInterfícies (Ciències físiques)Interfases (Ciencias físicas)Interfaces (Physical sciences)Ciències Experimentals i Matemàtiques53Programa de Doctorat Nanociències / Tesi realitzada a l'Institut de Recerca en Energia de Catalunya (IREC)In this project, nanoparticles were produced by solution-based one-pot synthesis, particularly colloidal methods. A series of powerful tools were used to characterize the structure and surface compositions before they were tested as anode materials in the field of energy conversion and storage. Firstly, we produced colloidal Ni polyhedral (16 ± 2 nm) and spherical (13 nm) NCs. The electrocatalytic properties of electrodes based on these NCs were first investigated in variable concentrations of KOH. Electrodes based on Ni polyhedral NCs displayed impressive current densities (59.4 mA cm 2) and mass activities (2016 mA mg 1) at 0.6 V vs. Hg/HgO in the presence of 1.0 M methanol and 1.0 M KOH, which corresponds to a twofold increase over electrodes based on spherical Ni NCs and over most previous Ni-based electrocatalyts previously reported. Electrodes based on faceted polyhedral NCs displayed a 30% loss of activity during the first few operation hours, but activity stabilized to around a 65% of the initial value after ca. 20000 s operations. And also, we developed a new synthetic route to produce NiSn intermetallic NPs with composition control. Detailed electrochemical measurements showed that these NPs exhibited excellent performance for MOR in alkaline solution. Ni-rich NiSn-based electrocatalysts displayed slightly improved performances over Ni-based electrocatalysts. Most notorious was the significantly improved stability of NiSn catalysts compared with that of Ni. This work represented a significant advance in developing cost-effective electrocatalysts with high activity and stability for MOR in DMFCs. In another sub-section of the energy conversion, a series of Ni3 xCoxSn2 (0 ≤ x ≤ 3) NPs were produced based one the protocol. A preliminary optimized catalyst composition, Ni2.5Co0.5Sn2, showed a current density of 65.5 mA cm 2 and a mass current density of 1050 mA mg 1 at 0.6 V vs. Hg/HgO for the MOR in 1.0 M KOH containing 1.0 M methanol. While the introduction of Co slightly decreased the durability with respect to Ni3Sn2, Ni2.5Co0.5Sn2 NP-based electrodes demonstrated significant stability during continuous cycling and increased activity at high methanol concentrations. The presence of Sn was found to be essential to improve stability with respect to elemental Ni, although Sn was observed to slowly dissolve in the presence of KOH. In the energy storage field, we focused on the performance as anode material in LIBs and SIBs. Among the different NixSn compositions tested, best performances toward Li+ ion and Na+ ion insertion were obtained for Ni0.9Sn NP-based electrodes. This optimized cycling charge-discharge performance for LIBs provided 980 mAh g 1 at 0.2 A g 1 after 340 cycles. Additionally, Ni0.9Sn NP-based electrodes were tested in Na+-ion half cells, exhibiting 160 mAh g 1 over 120 cycles at 0.1 A g 1. The pseudocapacitive charge-storage accounted for a high portion of the whole energy storage capacity, which was associated to the small size and the composition of the NixSn NPs used. In the last chapter of the project, the CoxSn NP composition was adjusted over the range 1.3 ≤ x ≤ 0.3. These Co-Sn solid solutions were tested as anode materials in LIBs on a half-cell battery system. Among the different compositions tested, Co0.9Sn and Co0.7Sn NPs provided the best performance, with a charge-discharge capacity above 1500 mAh g 1 at a current density of 0.2 A g 1 after 220 cycles and up to 800 mAh g 1 at 1.0 A g 1 after 400 cycles. Through the kinetic analysis of Co0.9Sn NPs by the CV measurement, we found these charge-discharge capacities to include a very large pseudocapacitive contribution, up to 81% at a sweep rate of 1 mV s 1, which we related to the small size of the particles.Universitat de BarcelonaCabot i Codina, AndreuPérez Rodríguez, AlejandroUniversitat de Barcelona. Facultat de Física201920192019info:eu-repo/semantics/doctoralThesisinfo:eu-repo/semantics/publishedVersion184 p.application/pdfapplication/pdfhttp://hdl.handle.net/10803/667475TDX (Tesis Doctorals en Xarxa)reponame:TDR. Tesis Doctorales en Redinstname:CBUC, CESCAInglésL'accés als continguts d'aquesta tesi queda condicionat a l'acceptació de les condicions d'ús establertes per la següent llicència Creative Commons: http://creativecommons.org/licenses/by-nc-nd/4.0/http://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:www.tdx.cat:10803/6674752026-06-14T12:46:07Z
score 15,301603

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