Δημοσιεύσεις

Project Acronym: NANO2D
Title: NANOparticles-2D-materials
Affiliation: aristotle university of thessaloniki
Pi: Joseph Kioseoglou
Research Field: chemical sciences and materials

Single Nanoparticle Activities in Ensemble: A Study on Pd Cluster Nanoportals for Electrochemical Oxygen Evolution Reaction
by Datta, Abheek, Porkovich, Alexander J., Kumar, Pawan, Nikoulis, Giorgos, Kioseoglou, Joseph, Sasaki, Toshio, Steinhauer, Stephan, Grammatikopoulos, Panagiotis and Sowwan, Mukhles
Abstract:
Comprehensive understanding of the electrochemical activity of single nanoparticles (NPs) is in critical need for opening new avenues in the broad field of electrochemistry. Published reports on single-NP electrocatalysts typically include complicated and difficult methods of synthesis and characterization; moreover, these methods usually fail to provide a reliable way to measure the activities of individual NPs within larger ensembles of particles, i.e., in real-life nanocatalyst systems. In the present work, we synthesized from the gas phase Pd NPs that act as nanoportals for electron transfer within surface-oxidized Mg thin films. The physical synthesis method provided excellent control over the deposition density and, hence, enabled the design of a system where each individual open nanoportal forms an independent active single-NP electrode (SNPE). Being uncoupled from one another, these SNPEs contribute separately toward the total electrocatalytic activity while simultaneously providing a measure of their average, individual activities. We were thus able to fabricate a stable, steady-state electrode for the electrochemical oxygen evolution reaction (OER) and to study the activity and stability of the SNPEs over a period of 20 days; the former depended on the size of the NPs, while the latter depended on the SNPEs’ resistance to aerial oxidation. The remarkable stability of the ensemble catalysts under OER conditions proves that this concept can be used for further studies on the activities of different single NPs in numerous real-life systems.
Reference:
Single Nanoparticle Activities in Ensemble: A Study on Pd Cluster Nanoportals for Electrochemical Oxygen Evolution Reaction (Datta, Abheek, Porkovich, Alexander J., Kumar, Pawan, Nikoulis, Giorgos, Kioseoglou, Joseph, Sasaki, Toshio, Steinhauer, Stephan, Grammatikopoulos, Panagiotis and Sowwan, Mukhles), In The Journal of Physical Chemistry C, volume 123, 2019.
Bibtex Entry:
@article{doi:10.1021-acs.jpcc.9b07824,
 author = {Datta, Abheek and Porkovich, Alexander J. and Kumar, Pawan and Nikoulis, Giorgos and Kioseoglou, Joseph and Sasaki, Toshio and Steinhauer, Stephan and Grammatikopoulos, Panagiotis and Sowwan, Mukhles},
 title = {Single Nanoparticle Activities in Ensemble: A Study on Pd Cluster Nanoportals for Electrochemical Oxygen Evolution Reaction},
 journal = {The Journal of Physical Chemistry C},
 volume = {123},
 number = {43},
 pages = {26124-26135},
 year = {2019},
 bibyear = {2019},
 doi = {10.1021/acs.jpcc.9b07824},
 url = {https://doi.org/10.1021/acs.jpcc.9b07824},
 eprint = {https://doi.org/10.1021/acs.jpcc.9b07824},
 abstract = { Comprehensive understanding of the electrochemical activity of single nanoparticles (NPs) is in critical need for opening new avenues in the broad field of electrochemistry. Published reports on single-NP electrocatalysts typically include complicated and difficult methods of synthesis and characterization; moreover, these methods usually fail to provide a reliable way to measure the activities of individual NPs within larger ensembles of particles, i.e., in real-life nanocatalyst systems. In the present work, we synthesized from the gas phase Pd NPs that act as nanoportals for electron transfer within surface-oxidized Mg thin films. The physical synthesis method provided excellent control over the deposition density and, hence, enabled the design of a system where each individual open nanoportal forms an independent active single-NP electrode (SNPE). Being uncoupled from one another, these SNPEs contribute separately toward the total electrocatalytic activity while simultaneously providing a measure of their average, individual activities. We were thus able to fabricate a stable, steady-state electrode for the electrochemical oxygen evolution reaction (OER) and to study the activity and stability of the SNPEs over a period of 20 days; the former depended on the size of the NPs, while the latter depended on the SNPEs’ resistance to aerial oxidation. The remarkable stability of the ensemble catalysts under OER conditions proves that this concept can be used for further studies on the activities of different single NPs in numerous real-life systems. },
}