Iridium-coated ruthenium nanocatalysts for optimization of oxygen evolution reaction in acidic and alkaline media

Currently, as the threat of global warming intensifies, exploration of ways to efficiently and economically use renewable sources of energy is becoming more essential. Varying power supply by solar and wind energies as well as the need for a carbon-free fuel in fossil fuel-dominant transportation se...

Full description

Saved in:
Bibliographic Details
Main Author: Seow, Justin Zhu Yeow
Other Authors: Xu Zhichuan Jason
Format: Final Year Project
Language:English
Published: 2018
Subjects:
Online Access:http://hdl.handle.net/10356/74436
Tags: Add Tag
No Tags, Be the first to tag this record!
Institution: Nanyang Technological University
Language: English
id sg-ntu-dr.10356-74436
record_format dspace
spelling sg-ntu-dr.10356-744362023-03-04T15:42:39Z Iridium-coated ruthenium nanocatalysts for optimization of oxygen evolution reaction in acidic and alkaline media Seow, Justin Zhu Yeow Xu Zhichuan Jason School of Materials Science and Engineering DRNTU::Engineering::Materials::Nanostructured materials DRNTU::Engineering::Materials::Energy materials Currently, as the threat of global warming intensifies, exploration of ways to efficiently and economically use renewable sources of energy is becoming more essential. Varying power supply by solar and wind energies as well as the need for a carbon-free fuel in fossil fuel-dominant transportation sector have increased demand for energy storage. Hydrogen, currently being one of the best choice for energy storage, is mostly produced from natural gas. To increase the role of water electrolysis in producing hydrogen, its efficiency, limited by oxygen evolution reaction (OER), has to increase. Based on various successful core-shell structuring strategy for OER nanocatalysts, an Ir-coated Ru core-shell-like nanoparticle with Ru-to-Ir atomic ratios of 3:7, 3:10 and 3:15 (Ru3@Ir7, Ru3@Ir10 and Ru3@Ir15 respectively) were synthesized. At overpotential of 200 mV (1.43 V versus RHE), Ru3@Ir10 nanocatalyst recorded the highest specific OER activities (0.61 μA/cm2oxide in KOH and 8.02 μA/cm2oxide in HClO4) and highest mass activities (0.53 A/goxide in KOH and 6.92 A/goxide HClO4) among the bimetallic nanocatalysts in this study, with higher stability and lower dissolution compared to Ru nanocatalyst after 50-cycle cyclic voltammetry protocol in both electrolytes. The substantially stable and highly catalytically active (near) core-shell nanocatalyst has high potential for usage in water electrolysers in both acidic and alkaline media. Bachelor of Engineering (Materials Engineering) 2018-05-17T13:54:36Z 2018-05-17T13:54:36Z 2018 Final Year Project (FYP) http://hdl.handle.net/10356/74436 en Nanyang Technological University 50 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering::Materials::Nanostructured materials
DRNTU::Engineering::Materials::Energy materials
spellingShingle DRNTU::Engineering::Materials::Nanostructured materials
DRNTU::Engineering::Materials::Energy materials
Seow, Justin Zhu Yeow
Iridium-coated ruthenium nanocatalysts for optimization of oxygen evolution reaction in acidic and alkaline media
description Currently, as the threat of global warming intensifies, exploration of ways to efficiently and economically use renewable sources of energy is becoming more essential. Varying power supply by solar and wind energies as well as the need for a carbon-free fuel in fossil fuel-dominant transportation sector have increased demand for energy storage. Hydrogen, currently being one of the best choice for energy storage, is mostly produced from natural gas. To increase the role of water electrolysis in producing hydrogen, its efficiency, limited by oxygen evolution reaction (OER), has to increase. Based on various successful core-shell structuring strategy for OER nanocatalysts, an Ir-coated Ru core-shell-like nanoparticle with Ru-to-Ir atomic ratios of 3:7, 3:10 and 3:15 (Ru3@Ir7, Ru3@Ir10 and Ru3@Ir15 respectively) were synthesized. At overpotential of 200 mV (1.43 V versus RHE), Ru3@Ir10 nanocatalyst recorded the highest specific OER activities (0.61 μA/cm2oxide in KOH and 8.02 μA/cm2oxide in HClO4) and highest mass activities (0.53 A/goxide in KOH and 6.92 A/goxide HClO4) among the bimetallic nanocatalysts in this study, with higher stability and lower dissolution compared to Ru nanocatalyst after 50-cycle cyclic voltammetry protocol in both electrolytes. The substantially stable and highly catalytically active (near) core-shell nanocatalyst has high potential for usage in water electrolysers in both acidic and alkaline media.
author2 Xu Zhichuan Jason
author_facet Xu Zhichuan Jason
Seow, Justin Zhu Yeow
format Final Year Project
author Seow, Justin Zhu Yeow
author_sort Seow, Justin Zhu Yeow
title Iridium-coated ruthenium nanocatalysts for optimization of oxygen evolution reaction in acidic and alkaline media
title_short Iridium-coated ruthenium nanocatalysts for optimization of oxygen evolution reaction in acidic and alkaline media
title_full Iridium-coated ruthenium nanocatalysts for optimization of oxygen evolution reaction in acidic and alkaline media
title_fullStr Iridium-coated ruthenium nanocatalysts for optimization of oxygen evolution reaction in acidic and alkaline media
title_full_unstemmed Iridium-coated ruthenium nanocatalysts for optimization of oxygen evolution reaction in acidic and alkaline media
title_sort iridium-coated ruthenium nanocatalysts for optimization of oxygen evolution reaction in acidic and alkaline media
publishDate 2018
url http://hdl.handle.net/10356/74436
_version_ 1759853869987266560