Spinel-structure CoFe2S4 as electrocatalyst for oxygen evolution reaction in alkaline medium

Small molecular electrocatalysts are essential in the application of fuel cells and electrolyzers as the commitment towards the low carbon economy. The rising demand of effective and affordable catalysts for the bottleneck oxygen evolution reaction (OER) of water electrolysis has stimulated the deve...

Full description

Bibliographic Details
Main Author: Ng, Khay Wen
Other Authors: Xu Zhichuan Jason
Format: Final Year Project (FYP)
Language:English
Published: 2019
Subjects:
Online Access:http://hdl.handle.net/10356/76767
_version_ 1826115832971788288
author Ng, Khay Wen
author2 Xu Zhichuan Jason
author_facet Xu Zhichuan Jason
Ng, Khay Wen
author_sort Ng, Khay Wen
collection NTU
description Small molecular electrocatalysts are essential in the application of fuel cells and electrolyzers as the commitment towards the low carbon economy. The rising demand of effective and affordable catalysts for the bottleneck oxygen evolution reaction (OER) of water electrolysis has stimulated the development of catalysts from transition metal-based compounds, replacing the costly noble metal-based materials. In this report, cobalt-iron spinel sulfide CoFe2S4 particles are prepared through hydrothermal method and applied as an electrocatalyst for OER in alkaline KOH electrolyte with different pH (12.5, 13 and 13.5). The spinel structured CoFe2S4 is characterized via scanning electron microscope (SEM) imaging, x-ray diffraction (XRD) analysis and Brunaeur-Emmett-Teller (BET) method. Meanwhile, the OER activity of CoFe2S4 particles is reviewed through cyclic voltammetry (CV) measurement. The electrochemical analysis results show the increase of current density at specific applied potential as the pH of KOH increases, which deduce that the catalytic activity of CoFe2S4 is dependent on pH of the electrolyte used. Also, CoFe2S4 particles display small overpotential and a small Tafel slope in 0.3M KOH solution (pH=13.5), making it an interesting material as OER electrocatalyst in basic media.
first_indexed 2024-10-01T04:01:34Z
format Final Year Project (FYP)
id ntu-10356/76767
institution Nanyang Technological University
language English
last_indexed 2024-10-01T04:01:34Z
publishDate 2019
record_format dspace
spelling ntu-10356/767672023-03-04T15:39:38Z Spinel-structure CoFe2S4 as electrocatalyst for oxygen evolution reaction in alkaline medium Ng, Khay Wen Xu Zhichuan Jason School of Materials Science and Engineering DRNTU::Engineering::Materials::Nanostructured materials DRNTU::Engineering::Materials::Energy materials Small molecular electrocatalysts are essential in the application of fuel cells and electrolyzers as the commitment towards the low carbon economy. The rising demand of effective and affordable catalysts for the bottleneck oxygen evolution reaction (OER) of water electrolysis has stimulated the development of catalysts from transition metal-based compounds, replacing the costly noble metal-based materials. In this report, cobalt-iron spinel sulfide CoFe2S4 particles are prepared through hydrothermal method and applied as an electrocatalyst for OER in alkaline KOH electrolyte with different pH (12.5, 13 and 13.5). The spinel structured CoFe2S4 is characterized via scanning electron microscope (SEM) imaging, x-ray diffraction (XRD) analysis and Brunaeur-Emmett-Teller (BET) method. Meanwhile, the OER activity of CoFe2S4 particles is reviewed through cyclic voltammetry (CV) measurement. The electrochemical analysis results show the increase of current density at specific applied potential as the pH of KOH increases, which deduce that the catalytic activity of CoFe2S4 is dependent on pH of the electrolyte used. Also, CoFe2S4 particles display small overpotential and a small Tafel slope in 0.3M KOH solution (pH=13.5), making it an interesting material as OER electrocatalyst in basic media. Bachelor of Engineering (Materials Engineering) 2019-04-09T13:53:29Z 2019-04-09T13:53:29Z 2019 Final Year Project (FYP) http://hdl.handle.net/10356/76767 en Nanyang Technological University 38 p. application/pdf
spellingShingle DRNTU::Engineering::Materials::Nanostructured materials
DRNTU::Engineering::Materials::Energy materials
Ng, Khay Wen
Spinel-structure CoFe2S4 as electrocatalyst for oxygen evolution reaction in alkaline medium
title Spinel-structure CoFe2S4 as electrocatalyst for oxygen evolution reaction in alkaline medium
title_full Spinel-structure CoFe2S4 as electrocatalyst for oxygen evolution reaction in alkaline medium
title_fullStr Spinel-structure CoFe2S4 as electrocatalyst for oxygen evolution reaction in alkaline medium
title_full_unstemmed Spinel-structure CoFe2S4 as electrocatalyst for oxygen evolution reaction in alkaline medium
title_short Spinel-structure CoFe2S4 as electrocatalyst for oxygen evolution reaction in alkaline medium
title_sort spinel structure cofe2s4 as electrocatalyst for oxygen evolution reaction in alkaline medium
topic DRNTU::Engineering::Materials::Nanostructured materials
DRNTU::Engineering::Materials::Energy materials
url http://hdl.handle.net/10356/76767
work_keys_str_mv AT ngkhaywen spinelstructurecofe2s4aselectrocatalystforoxygenevolutionreactioninalkalinemedium