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Investigation of Vacuum Plasma Spraying (VPS) Coated Anodes for Alkaline Water Electrolysis

Pimentel Félix, Ana Sofia (2012) Investigation of Vacuum Plasma Spraying (VPS) Coated Anodes for Alkaline Water Electrolysis. Master's, Universidade de Porto.

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Abstract

Hydrogen has been pointed out to be the energy source of the future. So far its production was estimated to derivate 96 % from fossil fuels. However, the increase of environmental problems and the dwindling of the oil reserves are two big reasons to change the hydrogen production. The alkaline water electrolysis, associated with renewable energies, has been reported as one way to solve the problems of hydrogen production and in parallel resolving the intermittent availability of renewable electrical power. But, to become effective and economically attractive, it is necessary to develop high-performance electrocatalytical electrodes that are suitable for the intermittent process. Raney nickel (Raney-Ni) is one of the most promising electrocatalytic materials. The addition of different compounds into Raney-Ni electrodes can improve its catalytic efficiency as well as its longterm stability. Despite the variety of coated electrodes preparation, Vacuum Plasma Spraying (VPS) has shown to originate the best electrochemical performance electrodes in alkaline water electrolysis. Due to the slow kinetics of the oxygen evolution reaction (OER), the development and optimization of anode electrodes is of critical importance. Electrochemical measurements and analytical analysis were made to study the catalytic efficiency and long-term stability of adding to Raney-Ni electrode perovskite (La0.6Sr0.4CoO3 (LSCoO3 or LSC) and La0.6Sr0.4Fe0.8Co0.2O3 (LSCF)), cobalt oxide (Co3O4) and NiAlMo (nickel aluminium molybdenum). The final results show that adding perovskite and cobalt oxide to Raney-Ni improved the catalytic efficiency and long-term stability. However, further tests must be done to assess the effective logterm stability of the proposed Raney-Ni modifications.

Document Type:Thesis (Master's)
Additional Information:Betreuer am DLR: Regine Reißner
Title:Investigation of Vacuum Plasma Spraying (VPS) Coated Anodes for Alkaline Water Electrolysis
Authors:
AuthorsInstitution or Email of Authors
Pimentel Félix, Ana SofiaUNSPECIFIED
Date:July 2012
Number of Pages:66
Status:Published
Keywords:Elektrolyse, Katalysator, Elektrode, Nickel
Institution:Universidade de Porto
Department:Faculdade de Engenharia, Department of Chemical Engineering
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion and Use
HGF - Program Themes:Fuel Cells
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Elektrochemische Prozesse
Location: Stuttgart
Institutes and Institutions:Institute of Technical Thermodynamics > Electrochemical Energy Technology
Deposited By: Regine Reißner
Deposited On:26 Nov 2012 15:57
Last Modified:12 Dec 2013 21:52

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