Synthesis of first row transition metal oxide nanomaterials for electrocatalytic water oxidation reaction

Download

index.pdf

Date

2020

Author

Çetin, Asude

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

378
views

269
downloads

Environmental concerns associated with the use of fossil fuels have elevated the demand for safe, clean and renewable energy sources. Hydrogen is an outstanding energy carrier because of the high amount of energy stored in its bond, and an excellent alternative to fossil fuels. Therefore, production of hydrogen from readily available and abundant sources such as water through electrochemical water splitting has gained increasing attention in the last couple of decades. However, water oxidation step of overall water splitting process has large energy barrier and thus, requires application of overpotential and use of highly stable and active catalysts for the efficient formation of hydrogen. A great number of nano-sized metal oxide materials have been proven to be very active catalysts for electrochemical water oxidation. In addition to their unique properties, their large surface area and thus, large active sites make such nanomaterials promising candidates as electrocatalysts. This dissertation covers the preparation and characterization of bimetallic oxide nanomaterials composed of various combinations of earth abundant, transition metals as well as their electrochemical activities towards water oxidation reaction. Firstly, metal oxide nanomaterials in CuCr2O4, FeMnO3, NiFe2O4-NiO and NiCo2O4-NiO structures with various morphologies were synthesized via simple and reproducible methods. Synthesized nanomaterials were then characterized using a combination of analytical techniques including XRD, SEM, EDX, TEM, XPS, ICP- OES and BET. Conductive electrode surfaces were modified with these nanomaterials, and finally their electrochemical behavior in water oxidation reaction were investigated. The overall water oxidation activity of the synthesized materials was observed to be comparable to benchmark RuO2 or superior to some of the water oxidation catalysts having similar structures.

Subject Keywords

Transition metal oxides., Transition Metal Oxide, Nanomaterials, Water Oxidation, Oxygen Evolution, Electrocatalysis.

URI

http://etd.lib.metu.edu.tr/upload/12625223/index.pdf
https://hdl.handle.net/11511/45146

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Synthesis and characterization of nickel zinc oxide nanoparticles and their investigation as water oxidation catalyst Ağcalı, Rahime Yağmur; Nalbant Esentürk, Emren; Department of Chemistry (2020-10) The depletion of fossil fuels has steered attention to discover new energy sources. Fossil fuels are not desirable to use because of their hazardous effects on earth and being non-renewable, yet they have been used as primary energy sources all over the world. Due to their limited amount, the focus of research has become maintaining renewable, green, and clean energy. In this sense, among others hydrogen has a great potential for being a primary source. The possible supplied energy from hydrogen is gr...
SYNTHESIS, CHARACTERIZATION AND CATALYTIC INVESTIGATION OF IRON BASED NANO-CATALYTS FOR WATER OXIDATION REACTION KOCABAŞ, SERRA; Nalbant, Emren; Department of Chemistry (2022-2-11) The search for new energy storage technologies drew attention to the production of hydrogen from clean, renewable sources such as water with increase of scarcity of fossil fuels. Hence, water splitting electrochemically has been the centre of attention in recent years. However, water oxidation (oxygen evolution) (OER) reaction requires high potential to achieve large energy barrier occurred while transferring four electrons and four protons. To overcome this energy barrier, catalyst with high stability and ...
Synthesis of some metalophthalocyanines and their effects on the performance of pem fuel cells Erkan, Serdar; Eroğlu, İnci; Department of Chemical Engineering (2005) Importance of clean, sustainable and renewable energy sources are increasing gradually because of either being environmental friendly or being alternative for fossil fuels. Hydrogen energy system will let the utilization of alternative energy sources. Fuel cells are the most suitable energy conversion devices while passing through the hydrogen economy. The cost of the fuel cell systems need to be reduced in order to achieve commercialization of these systems. One of the most important cost items is platinum...
Improvement in dye sensitized solar cells from past to present Mohiuddin, Obaidullah; Obaidullah, Madina; Sabah, Cumali (Springer Science and Business Media LLC, 2018-10-01) Several emerging renewable technologies are available to satisfy the current energy demand and to minimize the effect of environmental degradation caused by high consumption of fossil fuels. These technologies are not mature enough to solve this problem but require more time for improving the efficiency, and cost reduction to become the economical alternative of fossil fuels. In this paper Dye-sensitized solar cell (DSSC) has been discussed in detail owing to advancement in the technology. Since each compon...
Novel bimetallic mesoporous catalysts for hydrogen production through steam reforming of ethanol Şener, Canan; Doğu, Timur; Doğu, Gülşen; Department of Chemical Engineering (2012) Hydrogen is considered as an alternative clean energy source due to the depletion of fossil fuels and related environmental problems. Steam reforming of bio-ethanol, has excellent potential for hydrogen production, with CO2 neutrality. Ni, Pd and Pt are the most active metals for steam reforming of ethanol. Improving catalytic activity of supported Ni catalyst by incorporating small amount of Pd or Pt is a successful method for increasing activity and stability of the catalyst. Development of active and sta...

Citation Formats

A. Çetin, “Synthesis of first row transition metal oxide nanomaterials for electrocatalytic water oxidation reaction,” Thesis (Ph.D.) -- Graduate School of Natural and Applied Sciences. Chemistry., Middle East Technical University, 2020.