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Tuning the Reactivity of TEMPO during Electrocatalytic Alcohol Oxidations in Room-Temperature Ionic Liquids (2019)
Journal Article
Delorme, A. E., Sans, V., Licence, P., & Walsh, D. A. (2019). Tuning the Reactivity of TEMPO during Electrocatalytic Alcohol Oxidations in Room-Temperature Ionic Liquids. ACS Sustainable Chemistry and Engineering, 7(13), 11691-11699. https://doi.org/10.1021/acssuschemeng.9b01823

2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) is a promising, sustainable, metal-free mediator for oxidation of alcohols. In this contribution, we describe how the selectivity of TEMPO for electrocatalytic alcohol oxidations in room-temperature ionic... Read More about Tuning the Reactivity of TEMPO during Electrocatalytic Alcohol Oxidations in Room-Temperature Ionic Liquids.

The nature of proton shuttling in protic ionic liquid fuel cells (2019)
Journal Article
Smith, D. E., & Walsh, D. A. (2019). The nature of proton shuttling in protic ionic liquid fuel cells. Advanced Energy Materials, 9(24), Article 1900744. https://doi.org/10.1002/aenm.201900744

It has been proposed previously that protic ionic liquids (PILs) such as diethylmethylammonium triflate could be used as the electrolytes in nonhumidified, intermediate temperature H2 fuel cells, potentially offering the prospect of high conductivity... Read More about The nature of proton shuttling in protic ionic liquid fuel cells.

Valorization of lignin waste: high electrochemical capacitance of lignin-derived carbons in aqueous and ionic liquid electrolytes (2018)
Journal Article
Sangchoom, W., Walsh, D. A., & Mokaya, R. (2018). Valorization of lignin waste: high electrochemical capacitance of lignin-derived carbons in aqueous and ionic liquid electrolytes. Journal of Materials Chemistry A, 6(38), (18701-18711). doi:10.1039/c8ta07632d. ISSN 2050-7488

This report describes the utilization of waste lignin-derived activated carbons (LACs) as high-energy/high-power electrode materials for electric double layer capacitors(EDLCs). The influence of carbon-pore structure on the capacitance of the LACs in... Read More about Valorization of lignin waste: high electrochemical capacitance of lignin-derived carbons in aqueous and ionic liquid electrolytes.

An ultra-high vacuum electrochemical/mass spectrometry study of anodic decomposition of a protic ionic liquid (2018)
Journal Article
Goodwin, S., Gibson, J., Jones, R., & Walsh, D. A. (2018). An ultra-high vacuum electrochemical/mass spectrometry study of anodic decomposition of a protic ionic liquid. Electrochemistry Communications, 90, https://doi.org/10.1016/j.elecom.2018.04.013

Protic ionic liquids (PILs) are ionic liquids that are formed by proton transfer from Brønsted acids to Brønsted bases, and which are being proposed for use in a wide range of electrochemical devices. In this contribution, we describe electrolysis of... Read More about An ultra-high vacuum electrochemical/mass spectrometry study of anodic decomposition of a protic ionic liquid.

Sulfonylative and azidosulfonylative cyclizations by visible-light-photosensitization of sulfonyl azides in THF (2017)
Journal Article
Zhu, S., Pathigoolla, A., Lowe, G., Walsh, D. A., Cooper, M., Lewis, W., & Lam, H. W. (2017). Sulfonylative and azidosulfonylative cyclizations by visible-light-photosensitization of sulfonyl azides in THF. Chemistry - A European Journal, 23(69), https://doi.org/10.1002/chem.201704380

The generation of sulfonyl radicals from sulfonyl azides using visible light and a photoactive iridium complex in THF is described. This process was used to promote sulfonylative and azidosulfonylative cyclizations of enynes to give several classes o... Read More about Sulfonylative and azidosulfonylative cyclizations by visible-light-photosensitization of sulfonyl azides in THF.

The contrasting effects of diethylmethylamine during reduction of protons and oxidation of formic acid in diethylmethylammonium-based protic ionic liquids (2017)
Journal Article
Goodwin, S., Muhammad, S., Tuan, L., & Walsh, D. (2018). The contrasting effects of diethylmethylamine during reduction of protons and oxidation of formic acid in diethylmethylammonium-based protic ionic liquids. Journal of Electroanalytical Chemistry, 819, https://doi.org/10.1016/j.jelechem.2017.10.021

Ionic liquids are formally defined as liquids that consist entirely of ions, and which are liquid below 100 C. As these liquids are being proposed for use in a range of electrochemical devices and applications, understanding the electrochemical beha... Read More about The contrasting effects of diethylmethylamine during reduction of protons and oxidation of formic acid in diethylmethylammonium-based protic ionic liquids.

Electroanalysis of neutral precursors in protic ionic liquids and synthesis of high-ionicity ionic liquids (2017)
Journal Article
Sean, G., Daniel, S., Joshua, G., Jones, R., & Walsh, D. A. (in press). Electroanalysis of neutral precursors in protic ionic liquids and synthesis of high-ionicity ionic liquids. Langmuir, 33(34), https://doi.org/10.1021/acs.langmuir.7b02294

Protic ionic liquids (PILs) are ionic liquids that are formed by transferring protons from Brønsted acids to Brønsted bases. While they nominally consist entirely of ions, PILs can often behave as though they contain a significant amount of neutral... Read More about Electroanalysis of neutral precursors in protic ionic liquids and synthesis of high-ionicity ionic liquids.

Closed bipolar electrodes for spatial separation of H2 and O2 evolution during water electrolysis and the development of high-voltage fuel cells (2017)
Journal Article
Goodwin, S., & Walsh, D. A. (2017). Closed bipolar electrodes for spatial separation of H2 and O2 evolution during water electrolysis and the development of high-voltage fuel cells. ACS Applied Materials and Interfaces, 9(28), 23654-23661. https://doi.org/10.1021/acsami.7b04226

Electrolytic water splitting could potentially provide clean H2 for a future ‘Hydrogen Economy.’ However, as H2 and O2 are produced in close proximity to each other in water electrolysers, mixing of the gases can occur during electrolysis, with pote... Read More about Closed bipolar electrodes for spatial separation of H2 and O2 evolution during water electrolysis and the development of high-voltage fuel cells.

Extremely Stable Platinum-Amorphous Carbon Electrocatalyst within Hollow Graphitized Carbon Nanofibers for the Oxygen Reduction Reaction (2016)
Journal Article
Gimenez-Lopez, M. D. C., Kurtoglu, A., Walsh, D. A., & Khlobystov, A. N. (2016). Extremely Stable Platinum-Amorphous Carbon Electrocatalyst within Hollow Graphitized Carbon Nanofibers for the Oxygen Reduction Reaction. Advanced Materials, 28(41), 9103-9108. https://doi.org/10.1002/adma.201602485

Unprecedented electrochemical stabilization of platinum nanoparticles (PtNPs) is presented, upon insertion into shortened hollow graphitized carbon nanofibers (PtNP@S-GNF) toward the oxygen-reduction reaction for fuel-cell applications. In contrast t... Read More about Extremely Stable Platinum-Amorphous Carbon Electrocatalyst within Hollow Graphitized Carbon Nanofibers for the Oxygen Reduction Reaction.

Bridging the performance gap between electric double-layer capacitors and batteries with high-energy/high-power carbon nanotube-based electrodes (2016)
Journal Article
Matabosch Coromina, H., Adeniran, B., Mokaya, R., & Walsh, D. A. (2016). Bridging the performance gap between electric double-layer capacitors and batteries with high-energy/high-power carbon nanotube-based electrodes. Journal of Materials Chemistry A, 4(38), 14586-14594. https://doi.org/10.1039/c6ta05686e

Electric double-layer capacitors (EDLCs) store electrical energy at the interface between charged electrodes and electrolytes and are higher-power devices than batteries. However, the amount of energy stored in EDLCs cannot compete with that in batte... Read More about Bridging the performance gap between electric double-layer capacitors and batteries with high-energy/high-power carbon nanotube-based electrodes.

Hydrogen Electrooxidation under Conditions of High Mass Transport in Room-Temperature Ionic Liquids and the Role of Underpotential-Deposited Hydrogen (2016)
Journal Article
Goodwin, S. E., & Walsh, D. A. (2016). Hydrogen Electrooxidation under Conditions of High Mass Transport in Room-Temperature Ionic Liquids and the Role of Underpotential-Deposited Hydrogen. Journal of Physical Chemistry C, 120(21), 11498-11507. https://doi.org/10.1021/acs.jpcc.6b01592

The hydrogen oxidation reaction (HOR), an electrocatalytic reaction of fundamental and applied interest, was studied in the protic ionic liquid (PIL) diethylmethylammonium trifluoromethanesulfonate, [dema][TfO], at Pt electrodes using rotating disk e... Read More about Hydrogen Electrooxidation under Conditions of High Mass Transport in Room-Temperature Ionic Liquids and the Role of Underpotential-Deposited Hydrogen.

Developing energy efficient lignin biomass processing – towards understanding mediator behaviour in ionic liquids (2016)
Journal Article
Eshtaya, M., Ejigu, A., Stephens, G., Walsh, D. A., Chen, G. Z., & Croft, A. K. (2016). Developing energy efficient lignin biomass processing – towards understanding mediator behaviour in ionic liquids. Faraday Discussions, 190, 127-145. https://doi.org/10.1039/c5fd00226e

Environmental concerns have brought attention to the requirement for more efficient and renewable processes for chemicals production. Lignin is the second most abundant natural polymer, and might serve as a sustainable resource for manufacturing fuel... Read More about Developing energy efficient lignin biomass processing – towards understanding mediator behaviour in ionic liquids.

Biomass-derived activated carbon with simultaneously enhanced CO2 uptake for both pre and post combustion capture applications (2015)
Journal Article
Coromina, H. M., Walsh, D. A., & Mokaya, R. (2015). Biomass-derived activated carbon with simultaneously enhanced CO2 uptake for both pre and post combustion capture applications. Journal of Materials Chemistry A, 4(1), https://doi.org/10.1039/C5TA09202G

We report on the synthesis and CO2 uptake capabilities of a series of activated carbons derived from biomass raw materials, Jujun grass and Camellia japonica. The carbons were prepared via hydrothermal carbonization of the raw materials, which yielde... Read More about Biomass-derived activated carbon with simultaneously enhanced CO2 uptake for both pre and post combustion capture applications.

Synergistic catalyst-support interactions in a graphene-Mn3O4 electrocatalyst for vanadium redox flow batteries (2015)
Journal Article
Ejigu, A., Edwards, M., & Walsh, D. A. (2015). Synergistic catalyst-support interactions in a graphene-Mn3O4 electrocatalyst for vanadium redox flow batteries. ACS Catalysis, 5(12), https://doi.org/10.1021/acscatal.5b01973

The development of vanadium redox flow batteries (VRFBs) is partly limited by the sluggishness of the electrochemical reactions at conventional carbon-based electrodes. The VO2+/VO2+ redox reaction is particularly sluggish and improvements in battery... Read More about Synergistic catalyst-support interactions in a graphene-Mn3O4 electrocatalyst for vanadium redox flow batteries.

Room temperature ionic liquid electrolytes for redox flow batteries (2015)
Journal Article
Ejigu, A., Greatorex-Davies, P., & Walsh, D. A. (2015). Room temperature ionic liquid electrolytes for redox flow batteries. Electrochemistry Communications, 54, https://doi.org/10.1016/j.elecom.2015.01.016

Redox flow batteries (RFBs) usually contain aqueous or organic electrolytes. The aim of this communication is to explore the suitability of room temperature ionic liquids (RTILs) as solvents for RFBs containing metal complexes. Towards this aim, the... Read More about Room temperature ionic liquid electrolytes for redox flow batteries.

Polyaniline- and poly(ethylenedioxythiophene)-cellulose nanocomposite electrodes for supercapacitors (2014)
Journal Article
Liew, S. Y., Thielemans, W., & Walsh, D. A. (2014). Polyaniline- and poly(ethylenedioxythiophene)-cellulose nanocomposite electrodes for supercapacitors. Journal of Solid State Electrochemistry, 18(12), https://doi.org/10.1007/s10008-014-2669-7

The formation and characterisation of films of polyaniline (PANI) and poly(ethylenedioxythiophene) (PEDOT) containing cellulose nanocrystals (CNXLs) from cotton are described. PANI/CNXL films were electrodeposited from a solution containing CNXLs, HC... Read More about Polyaniline- and poly(ethylenedioxythiophene)-cellulose nanocomposite electrodes for supercapacitors.

The role of adsorbed ions during electrocatalysis in ionic liquids (2014)
Journal Article
Ejigu, A., & Walsh, D. A. (2014). The role of adsorbed ions during electrocatalysis in ionic liquids. Journal of Physical Chemistry C, 118(14), (7414-7422). doi:10.1021/jp411730z. ISSN 1932-7447

The effects of electrode–adsorbate interactions on electrocatalysis at Pt in ionic liquids are described. The ionic liquids are diethylmethylammonium trifluoromethanesulfonate, [dema][TfO], dimethylethylammonium trifluoromethanesulfonate, [dmea][TfO]... Read More about The role of adsorbed ions during electrocatalysis in ionic liquids.

Scanning electrochemical microscopy at thermal sprayed anti-corrosion coatings: effect of thermal spraying on heterogeneous electron transfer kinetics (2011)
Journal Article
Niaz, A., Boatwright, A., Voisey, K., & Walsh, D. A. (2011). Scanning electrochemical microscopy at thermal sprayed anti-corrosion coatings: effect of thermal spraying on heterogeneous electron transfer kinetics. Journal of Electroanalytical Chemistry, 657(1-2), https://doi.org/10.1016/j.jelechem.2011.03.009

The effect of thermal spraying on the electrochemical activity of an anti-corrosion superalloy was studied quantitatively using scanning electrochemical microscopy (SECM). The superalloy used was Inconel 625 (a Ni base superalloy) and thin coatings o... Read More about Scanning electrochemical microscopy at thermal sprayed anti-corrosion coatings: effect of thermal spraying on heterogeneous electron transfer kinetics.