Methanol Tolerant Oxygen Reduction Catalysts Based on Transition Metal Sulfides

Reeve, Robert W.; Christensen, PA; Hamnett, A.; Haydock, S. A.; Roy, S.

doi:10.1149/1.1838828

Cited by 152 publications

(81 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Metal chalcogenides are known to exhibit significant oxygen reduction capability. At the same time it is found that these materials are inactive towards methanol [10][11][12][13]. Here we report the activity of a methanol tolerant carbon supported RuSe catalyst for oxygen reduction.…”

Section: Introductionmentioning

confidence: 71%

Catalysts for Direct Methanol Fuel Cells

Neergat

Leveratto

Stimming³

2002

Fuel Cells

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 71%

Catalysts for Direct Methanol Fuel Cells

Neergat

Leveratto

Stimming³

2002

Fuel Cells

View full text Add to dashboard Cite

“…Being similar as the oxides, transition metal nitrides [43][44][45] and sulfides [46] also show catalytic activity towards the ORR and OER in Li-air batteries. It is shown that these catalysts not only reduce the over-potentials, but also enhance battery's energy efficiency and lifespan by reducing or eliminating the electrolyte decomposition.…”

Section: Transition Metal Oxides Nitrides and Sulfidesmentioning

confidence: 93%

Oxygen Redox Catalyst for Rechargeable Lithium-Air Battery

Zhang

2015

Rechargeable Batteries

View full text Add to dashboard Cite

“…The cathode catalyst can be modified so that it is not active for MOR or poisoned by CO, thus decreasing the cathode depolarization and increasing the ORR activity (like nitrogen-modified carbon materials (Publication III), Fe porphyrins [28] or transition metal sulfides [29]. A large effort has been directed in designing new membrane materials that would have high conductivity with good mechanical stability and selectivity toward water and protons [18].…”

Section: Methanol Crossover In Dmfcmentioning

confidence: 99%

Silicon nanograss as micro fuel cell gas diffusion layer

et al. 2010

View full text Add to dashboard Cite

Direct methanol fuel cells (DMFC) produce electrical energy directly from chemical energy. They are a promising candidate for power sources of portable devices due to the high energy density of methanol and the quick recharging procedure by fuel insertion. However, the problem areas of the DMFC are the slow electro-oxidation of methanol and the permeated methanol reacting at the cathode. New catalysts are constantly searched but they are often tested only for catalytic activity and the DMFC testing is omitted even though the catalyst layer (CL) structure has a large impact on the performance. Miniaturization of the system is also necessary for portable applications. Silicon etching can be used to fabricate small structures for fuel cells replacing or enhancing the functions of laboratory-scale components.In the first part of this thesis, new catalysts for the DMFC are studied with the emphasis on the CL structure. Different carbon supports for the anode were studied: standard carbon black and alternative few-walled carbon nanotubes (FWCNT) and graphitized carbon nanofiber (GNF). The alternative supports showed better DMFC performance but their stability was lower than with carbon black. However, the CL formed with GNF showed a very porous structure enhancing the mass transfer, so that higher binder content could be used improving the stability to the level of carbon black and the performance by 30%. The FWCNTs were also investigated as a platform for enzymatic methanol oxidation by studying the electrochemical properties of an immobilized cofactor pyrroloquinoline quinone (PQQ). A large amount of PQQ was adsorbed having a strong redox response and good stability in a wide pH window. For the cathode, a methanol-tolerant, Pt-free nitrogen-doped FWCNTs were tested in an alkaline DMFC as such testing is not often made. Its performance was remarkably 4 times better than with Pt when synthetic air was used as the oxidant.In the second part of thesis, an integrated gas diffusion layer (GDL) consisting of Si nanoneedles (nanograss) was tested in a micro fuel cell (MFC). The layer functioned properly at low current densities. For high power applications, a standard carbon cloth GDL was tested with the nanograss as a contact surface reducing the resistance between the GDL and the flow field. The use of the nanograss improved the MFC performance and stability. Finally, the MFCs were used as a catalyst testing platform and the results were compared with a similar test in a laboratory-scale DMFC. The results varied showing that the DMFC components also have a large impact on catalyst testing.Keywords direct methanol fuel cell, carbon nanomaterials, micro fuel cells, catalyst layer Tiivistelmä Suorametanolipolttokennot (SMPK) tuottavat sähköenergiaa suoraan kemiallisesta energiasta. Ne ovat lupaava vaihtoehto kannettavien laitteiden voimanlähteeksi, koska metanolilla on korkea energiatiheys ja lataaminen tapahtuu nopeasti polttoainelisäyksellä. SMPK:lla on kuitenkin rajoitteina metanolin hidas hapetusreaktio ja katodi...

show abstract

Methanol Tolerant Oxygen Reduction Catalysts Based on Transition Metal Sulfides

Cited by 152 publications

References 2 publications

Catalysts for Direct Methanol Fuel Cells

Catalysts for Direct Methanol Fuel Cells

Oxygen Redox Catalyst for Rechargeable Lithium-Air Battery

Silicon nanograss as micro fuel cell gas diffusion layer

Contact Info

Product

Resources

About