Olli Sorsa

VTT Technical Research Centre of Finland | vtt

For anion exchange membrane (AEM) electrolysis, challenges include finding an optimal catalyst for hydrogen evolution reaction (HER), as the noble metals are scarce while non-noble metals are inferior. Here, the noble metal amount is reduced in a straightforward solution synthesis which produces Pt-Ru surface nanoparticles and unique intratube nano...

We demonstrate a new kind of conformal nanoelectrode for hierarchical supercapacitors made by ALD. This grass-like alumina (GLA) nanoelectrode increases the capacitance of PS supercapacitors fourfold or 4× and consists of a TiN-GLA-TiN stack.

Developing highly efficient and robust electrocatalysts for oxygen evolution reaction (OER) is critical to renewable energy technologies. Here, we report an effective strategy to enhance the OER activity of a perovskite electrocatalyst through improving the electrical conductivity introduced by the structural transition. La0.7Sr0.3Fe1−xNixO3−δ (den...

We report two new ALD/MLD processes for depositing crystalline metal‐organic thin films build from 1,4‐benzenedisulfonate (BDS) as the organic linker and Cu or Li as the metal node. The processes yield in‐situ crystalline but hydrated Cu‐BDS and Li‐BDS films; in the former case, the crystal structure is of a previously known MOF‐like structure, whi...

A catalyst material containing platinum nanowires supported on single-walled carbon nanotubes (CNTs) is tested thoroughly for the use as a cathode catalyst for polymer electrolyte membrane water electrolyser (PEMEL). The Nafion ionomer content, the platinum to CNT ratio and the thickness of the catalyst layer (CL) is optimized. Long-term measuremen...

Poor stability restricts the use of polyaniline as a transition-metal-free, high-capacity electrode material for electrochemical energy storage. To improve the durability, methods such as adding a carbonaceous support and thermal treatments have been suggested. Here, we combine both of these approaches and study their effects on the degradation of...

Pt-supported on multi-walled carbon nanotubes (MWCNT) and N-modified MWCNT (N-MWCNT) catalysts are synthesized by pyrolysis from emeraldine solution and microemulsion. Their electrochemical properties and carbon corrosion resistance in a Proton Exchange Membrane Fuel Cell (PEMFC) are compared with a commercial Pt/Vulcan catalyst through I–V curves,...

High‐performing, lightweight and flexible asymmetric supercapacitors (ASCs) using NiCo‐layered double hydroxide (NiCo‐LDH) on nitrogen‐doped graphene (NG) as a positive and NG as a negative electrode is demonstrated. In a three‐electrode system, NiCo‐LDH@NG exhibits a high specific capacitance of 1421 F g−1 at a current density of 2 A g−1 and an ex...

Silicon is being increasingly studied as the next-generation anode material for Li-ion batteries because of its ten times higher gravimetric capacity compared with the widely-used graphite. While nanoparticles and other nanostructured silicon materials often exhibit good cyclability, their volumetric capacity tends to be worse or similar than that...

Mesoporous thin films of PtCo, PtNi and PtCu are prepared by a single-step potentiostatic electrodeposition on a carbon substrate. Films are characterized by SEM, XRD, XRF and BET, and their activity for oxygen reduction reaction (ORR) is studied in an acidic three-electrode cell. The results are compared with both a commercial nanoparticle Pt/C ca...

Water-soluble acrylate (Acryl S020) was tested as a potential binder for graphite negative electrodes in lithium-ion batteries, and the results were compared to the commonly used carboxymethyl cellulose (CMC) and styrene–butadiene rubber (SBR) CMC+SBR binder combination. Similar performance was observed at low C-rates and room temperature with both...

By using sp group metals as modifiers, the catalytic properties of Pt can be improved toward alcohols oxidation. In this work we report the performance increase of direct alcohol fuel cells (DAFC) fuelled with ethanol or 2-propanol with platinum based anode electrodes modified with Bi and Sb adatoms. For example, by simply adding Sb to the Pt/C bas...