Maido Merisalu

Maido Merisalu
University of Tartu · Institute of Physics

About

56
Publications
11,088
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915
Citations
Introduction
Maido Merisalu is an Estonian materials scientist who currently works at the Institute of Physics, University of Tartu. Maido is also the CEO of Captain Corrosion OÜ, which is a University of Tartu spin-off company. His main research is related to novel nanotechnology-based materials and coatings for automobile and aerospace industries or medical implants. Maido is currently involved in two main project - "corrosion testing in space" and "3D-animation based study materials and teaching resources for higher education"
Additional affiliations
August 2016 - present
Captain Corrosion OÜ
Position
  • Founder/CEO/Owner
Description
  • Captain Corrosion OÜ is a University of Tartu spin-off company that offers professional corrosion consultation and materials characterization services.
January 2012 - present
University of Tartu
Position
  • Engineer

Publications

Publications (56)
Article
A thin industrial corrosion-protection nanostructured coating for the Al alloy AA2024-T3 is demonstrated. The coating is prepared in a two-step process utilizing hard anodizing as a pre-treatment, followed by sealing and coating by atomic layer deposition (ALD). In the first step, anodizing in sulfuric acid at a low temperature converts the alloy s...
Article
The efficiency of ultra-thin corrosion protection coatings for susceptible to local corrosion AA2024-T3 is demonstrated. For this purpose, with atomic layer deposition (ALD) 50 nm thick TiO2, Al2O3, an Al2O3-TiO2 mixture and Al2O3/TiO2 nanolaminate coatings are grown on AA2024-T3 substrates, receiving different pretreatments prior to ALD coating. O...
Article
Platinum nanoparticles were photo-deposited on acid-treated multi-walled carbon nanotubes (CNTs) and SnO2-coated CNTs. The SnO2-CNT nanocomposite was synthesised by a chemical method. Scanning and scanning transmission electron microscopy results indicated that the CNTs surface is partially covered by the SnO2 layer. The surface morphology of the P...
Article
Highly active electrocatalysts for electrochemical oxygen reduction reaction (ORR) were prepared by high-temperature pyrolysis from 5-methylresorcinol, Co and/or Fe salts and dicyandiamide, which acts simultaneously as a precursor for reactive carbonitride template and a nitrogen source. The electrocatalytic activity of the catalysts for ORR in alk...
Article
Full-text available
In this work, Ag particles were electrodeposited onto nitrogen-doped graphene oxide, graphene, multi-walled carbon nanotube (MWCNT), and Vulcan carbon XC-72R supports by varying the upper potential limit. The surface morphology of the resulting Ag-based catalysts was examined by scanning electron microscopy. The electrochemical oxygen reduction rea...
Article
Full-text available
Effective corrosion protection via a thin ceramic coating on an Al-alloy AA2024-T3 is demonstrated. The preparation of the coating consists of two steps. First, with a special anodizing process, a chemically homogeneous thin base layer is formed on the substrate. Then, the nanoscale pores in the base layer are sealed, and the entire surface is cove...
Article
In this work He/H2 plasma jet treatment was used to reduce Pd ions in the aqueous solution with simultaneous deposition of created Pd nanoparticles to support materials. Graphene oxide (GO) and nitrogen-doped graphene oxide (NrGO) were both co-reduced with the Pd ions to formulate catalyst materials. Pd catalyst was also deposited on the surface of...
Article
Metal–air batteries (MABs) and regenerative fuel cells (RFCs) technologies rely on a combination of efficient electrochemical oxygen evolution and oxygen reduction reactions (OER and ORR, respectively). However, such bifunctional oxygen electrocatalysts also rely on the use of readily accessible carbon supports. Herein, we show that shungite, a nat...
Article
Full-text available
In this work, composite materials based on carbide-derived carbon (CDC) and carbon nanotubes (CNT) modified with Co phthalocyanine (CoPc) were employed as electrocatalysts towards the oxygen reduction reaction (ORR) in both alkaline and acid media. Two different CDCs derived from titanium carbide and silicon carbide were used and the CDC-to-CNT rat...
Article
High ORR activity and durability of Pt nanoparticles deposited on graphenated alumina nanofibers by plasma-assisted synthesis and sonoelectrochemical methods are demonstrated.
Article
Full-text available
This paper presents two technology experiments – the plasma brake for deorbiting and the electric solar wind sail for interplanetary propulsion – on board the ESTCube-2 and FORESAIL-1 satellites. Since both technologies employ the Coulomb interaction between a charged tether and a plasma flow, they are commonly referred to as Coulomb drag propulsio...
Article
Ball-milling is an effective method to decrease the size of carbide-derived carbon (CDC) grains, but milling might also affect other properties of CDC materials including but not limited to specific surface area (SSA), porosity, elemental composition and electrochemical properties. Thus, the goal of this work is to ball-mill various CDCs synthesise...
Article
Iron and nitrogen doping of carbon materials is one of the promising pathways towards replacing Pt/C in polymer electrolyte fuel cell cathodes. Here, we show a synthesis method to produce highly active non-precious metal catalysts and study the effect of synthesis parameters on the oxygen reduction reaction (ORR) activity in high-pH conditions. The...
Article
Cobalt- and nitrogen-doped carbide-derived carbon/carbon nanotube (CDC/CNT) composites are prepared and used as oxygen reduction reaction (ORR) electrocatalysts for an anion exchange membrane fuel cell (AEMFC) cathode. For the doping, high-temperature pyrolysis is applied using a cobalt salt and a nitrogen precursor (either dicyandiamide, urea or m...
Article
Nitrogen-doped carbide-derived carbon/carbon nanotube (CDC/CNT) composites were prepared and employed for the first time as a cathode electrocatalyst for the anion exchange membrane fuel cell (AEMFC). The CDC/CNT composites were doped with nitrogen using high temperature pyrolysis in the presence of different nitrogen precursors. In the rotating di...
Article
Full-text available
Herein, a simple synthesis method was used to prepare an active oxygen reduction reaction (ORR) electrocatalyst based on iron and nitrogen co‐doped graphene for polymer electrolyte fuel cell applications. For the synthesis of the ORR catalysts, two different graphene‐based materials, commercially available graphene (Gra) and graphene oxide (GO), we...
Article
Oxygen reduction reaction (ORR) is greatly affected by the morphology as well as the elemental composition of the nitrogen-doped carbon-based electrocatalysts. Thus, this work focuses on: (i) nitrogen doping of different graphene-based materials (two-dimensional materials: chemically converted graphene, graphene oxide, and commercially available gr...
Article
Pd catalyst was deposited onto various carbide‐derived carbons (CDC) that were prepared from TiC, Mo 2 C and SiC. Specific surface area and pore size distribution of the Pd/CDC materials were measured. Microwave plasma assisted atomic emission spectroscopy was carried out to give information about the amount of Pd deposited. Scanning electron micro...
Article
We have investigated the electrocatalytic activity of pyrolysed iron phthalocyanine (FePc) modified carbide-derived carbon/multi-walled carbon nanotube (CDC/CNT) composite materials for the electroreduction of O2. For comparison, FePc supported on Ketjenblack (KB/FePc) and heat-treated at 800 °C was also investigated. All materials containing a hig...
Article
Full-text available
It is highly desirable to synthesise heteroatom-doped carbon-based materials in an environmentally friendly and simple way, which possess good electrocatalytic activity towards the oxygen reduction reaction (ORR). Therefore, in this study, we focused on comparing sulphur and nitrogen co-doped graphene-based materials prepared using simple synthesis...
Article
Iron and nitrogen doped carbon-based catalysts are one of the most promising alternatives to platinum-group metal based ones currently used in the fuel cell industry. Here, we study the effect of ball-milling conditions and compositions of catalyst precursors comprising a silicon carbide-derived carbon (CDC) on the properties of the final catalysts...
Article
Herein, iron phthalocyanine (FePc) and cobalt phthalocyanine (CoPc) were used to impregnate nitrogen and corresponding transition metals to the multi-walled carbon nanotubes (MWCNT) or carbide-derived carbon (CDC) to compare the prepared highly efficient oxygen reduction reaction (ORR) catalysts for application in microbial fuel cells (MFC). The re...
Article
Full-text available
In this work, polyacrylonitrile (PAN), styrene–acrylonitrile copolymer (SAN) and multi-walled carbon nanotubes (MWCNTs) composite fibres (PAN/SAN/CNT) were prepared by electrospinning. The electrospun fibres were further pyrolysed (800–1200 °C) in N2 atmosphere with or without prior stabilisation (at 250 °C) in air to produce electrocatalyst materi...
Article
Platinum nanoparticles (NPs) were photo-deposited on SnO2-C nanocomposites prepared by sol-gel method. Surface morphology of the prepared materials, examined by scanning electron microscopy (SEM) and transmission electron microscopy, confirmed selective deposition of Pt NPs on SnO2 nanoclusters formed on carbon surface. X-ray photoelectron spectros...
Article
Electrochemical deposition by applying potential steps between −0.25 (or 0 V) and 0.85 V (vs SCE) was used to deposit Pd on different nanocarbon substrates. Influence of overpotential on the electrodeposition process was observed. Obtained Pd/C catalysts were studied with scanning electron microscopy and electrochemically in alkaline solution. Spec...
Article
Cobalt/nickel-containing SiOC-based porous ceramic electrocatalysts were prepared by pyrolysis of poly(methyl silsesquioxane) and poly(methyl phenyl silsesquioxane) as preceramic precursors combined with graphite and Co/Ni metal salts at 1000 °C in an atmosphere of nitrogen. Subsequently, the Co/Ni-SiOC materials were N-doped using dicyandiamide (D...
Article
For application in a microbial fuel cell (MFC), transition metal and nitrogen co-doped nanocarbon catalysts were synthesised by pyrolysis of multi-walled carbon nanotubes (MWCNTs) in the presence of iron- or cobalt chloride and nitrogen source. For the physicochemical characterisation of the catalysts, scanning electron microscopy (SEM) and X-ray p...
Article
Full-text available
For the first time, the oxygen reduction reaction (ORR) is studied on pyrolysed electrospun multi-walled carbon nanotube (MWCNT) and styrene–acrylonitrile (SAN) composite fibre catalysts in alkaline medium. Scanning electron microscopy images revealed that the prepared catalysts mainly consist of MWCNTs, while nitrogen doping of the catalysts is co...
Article
Full-text available
Platinum nanoparticles were deposited on reduced graphene oxide (rGO) and nitrogen‐doped rGO (rGO‐N) by He/H2 plasma jet treatment of H2PtCl6 aqueous solution for electroreduction of oxygen. Physical characterization of the prepared catalysts was performed by scanning electron microscopy, transmission electron microscopy and X‐ray photoelectron spe...
Article
Full-text available
Thin Pd coatings were obtained on glassy carbon electrodes by galvanically replacing the electron beam-deposited copper layers with palladium. The prepared electrodes were studied by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The electrodes were electrochemically tested for oxygen reduction reaction (ORR) employi...
Article
Herein, for the first time, ball-milling of carbon materials (e.g. graphite, graphene oxide or graphene) in the presence of dicyandiamide (DCDA) followed by heat treatment at 800 °C was employed to synthesise N-doped carbons for the oxygen reduction reaction (ORR) in alkaline medium. The obtained results highlight that: i) the N-doped nanocarbon ca...
Article
Acid-treated multi-walled carbon nanotubes (MWCNTs) were decorated with TiO2 using the atomic layer deposition (ALD) technique followed by uniform distribution of platinum nanoparticles (PtNPs) through magnetron sputtering. Surface analyses were performed by scanning electron microscopy (SEM), scanning transmission electron microscopy (STEM) and X-...
Book
Full-text available
The purpose of the Captain Corrosion Handbook of Anodizing is to provide the reader an overview of anodizing and its applications and an anodizing guide that can be used in do it yourself (DIY) projects, laboratory experiments or even for setting up an anodizing company. The electronic version (pdf) of the book can be purchased through the online s...
Article
Nitrogen-doped graphene oxide supported silver nanoparticles (Ag/NGO) have been synthesised using three different methods. The prepared catalysts were studied by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and electrochemically tested for oxygen reduction reaction (ORR) in alkal...
Article
Dilithium and zinc phthalocyanine derived catalysts supported on multiwalled carbon nanotubes (MWCNTs) have been studied as non-precious metal catalysts for oxygen electroreduction. The electrocatalysts were prepared by simple pyrolysis by varying the pyrolysis temperature and metal phthalocyanine-to-MWCNT ratio. The surface morphology of the catal...
Article
Full-text available
Platinum nanoparticles supported on multiwalled carbon nanotubes (Pt/MWCNT) were prepared using controlled electrochemical deposition from Ar-saturated H2PtCl6 solution. The electrodeposition parameters were varied to observe change in the surface morphology and electrocatalytic activity of the Pt/MWCNT catalysts for oxygen reduction reaction (ORR)...
Article
Electrocatalysis Pt nanoparticles Carbon nanotubes Composite catalysts Magnetron sputtering a b s t r a c t Platinum nanoparticles supported on acid-treated multi-walled carbon nanotubes (Pt/ MWCNT) catalysts were prepared through magnetron sputtering of Pt. The prepared Pt/ MWCNT composites were annealed at different temperatures to study heat-tre...
Conference Paper
This paper is republished in Acta Astronautica as "Coulomb drag propulsion experiments of ESTCube-2 and FORESAIL-1": https://www.researchgate.net/publication/337626758_Coulomb_drag_propulsion_experiments_of_ESTCube-2_and_FORESAIL-1 // Here we present the preliminary mission analysis for the ESTCube-2 three-unit CubeSat, which is designed to test Co...
Article
Full-text available
The aim of this study is to compare the electrochemical behaviour of graphene-based materials of different origin, e.g., commercially available graphene nanosheets from two producers and reduced graphene oxide (rGO) towards the oxygen reduction reaction (ORR) using linear sweep voltammetry, rotating disc electrode and rotating ring-disc electrode m...
Article
Full-text available
Tin oxide is considered to be one of the most promising semiconductor oxide materials for use as a gas sensor. However, a simple route for the controllable build-up of nanostructured, sufficiently pure and hierarchical SnO2 structures for gas sensor applications is still a challenge. In the current work, an aqueous SnO2 nanoparticulate precursor so...
Article
Manganese phthalocyanine (MnPc) and copper phthalocyanine (CuPc)-modified electrodes were prepared using multi-walled carbon nanotubes (MWCNTs) as a support material. The catalyst materials were heat treated at four different temperatures to investigate the effect of pyrolysis on the oxygen reduction reaction (ORR) activity of these electrocatalyst...
Article
Full-text available
The corrosion inhibition of metallic substrates is a prime issue for many potential applications where corrosion plays a crucial role. The development of carbon based on functionalized coatings could increase the lifetime of metallic substrates by inhibiting the corrosion process. Present work is an effort to develop a corrosion inhibiting composit...
Conference Paper
Full-text available
In this study we introduced polypyrrole-graphene oxide (PPy-GO) composite as a pore-filling material for the anodized aluminum alloy (AA2024) substrate surface. The aluminum alloy substrate was anodized in 15 % aqueous solution of sulphuric acid at room temperature (23±2C). Electrochemically the pores were filled with a PPy-GO composite nanomateri...
Article
Full-text available
Metallic impurity free solid carbon nanorod “Whiskers” (SCNR Whiskers), a derivative of carbon nanotubes, are explored in the fabrication of a Prussian Blue composite electrode and critically evaluated towards the mediated electroanalytical sensing of H2O2. The sensitivity and detection limits for H2O2 on the paste electrodes containing 20% (w/w) P...
Article
Full-text of this article is not available in this e-prints service. This article was originally published following peer-review in Electrochemistry Communications, published by and copyright Elsevier. Electrodes modified with carbon nanomaterials find wide ranging applications in electrochemistry such as in energy generation and storage through to...

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space-travel.blog is a space science and technology publication aimed at a general audience. We cover topics ranging from small satellite development and space startups to interplanetary science missions and terrestrial applications. The blog is published by UT Tartu Observatory and the ESTCube team in Estonia. We seek contributions from Northern Europe, the Baltics, and beyond.