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John Charles Walmsley

Senior Research Scientist

John Charles Walmsley

Senior Research Scientist

John Charles Walmsley
Phone: 982 83 914
Mobile: 982 83 914
Department: Materials and Nanotechnology
Office: Trondheim

publications and responsibilities

Publications

Publication

Geometrically confined favourable ion packing for high gravimetric capacitance in carbon-ionic liquid supercapacitors

http://www.sintef.no/en/publications/publication/?pubid=CRIStin+1301705

A supercapacitor, a safe and durable electrical energy storage device with fast charge–discharge capability, will achieve more widespread use if the specific energy can be improved. However, current understanding of pore characteristic effects on gravimetric capacitance has limited the development o...

Authors Wang Xuehang Zhou Haitao Sheridan Edel Walmsley John Charles Ren Dingding Chen De
Year 2016
Type Journal article
Publication

Nitrogen-doped carbon nanofibers on expanded graphite as oxygen reduction electrocatalysts

http://www.sintef.no/en/publications/publication/?pubid=CRIStin+1350057

A single-step chemical vapor deposition method using simple gaseous precursors was employed to grow nitrogen-doped carbon nanofibers from Fe and Ni particles on the surface of expanded graphite (N-CNF/EG). Due to the high electronic conductivity of the expanded graphite the N-CNF/EG could be used as...

Authors Buan Marthe Emelie Melandsø Muthuswamy Navaneethan Walmsley John Charles Chen De Rønning Magnus
Year 2016
Type Journal article
Publication

Chemical stability and H2 flux degradation of cercer membranes based on lanthanum tungstate and lanthanum chromite

http://www.sintef.no/en/publications/publication/?pubid=CRIStin+1335503

Ceramic–ceramic composite (cercer) membranes of (Mo-doped) lanthanum tungstate, La27(W,Mo)5O55.5−δ, and lanthanum chromite, La0.87Sr0.13CrO3−δ, have recently been shown to exhibit H2 permeabilities among state-of-the-art. The present work deals with the long-term stability of these cercer membranes ...

Year 2016
Type Journal article
Publication

Fabrication of K-promoted iron/carbon nanotubes composite catalysts for the Fischer-Tropsch synthesis of lower olefins

http://www.sintef.no/en/publications/publication/?pubid=CRIStin+1368690

K-promoted iron/carbon nanotubes composite (i.e., FeK-OX) was prepared by a redox reaction between carbon nanotubes and K2FeO4 followed by thermal treatments on a purpose as the Fischer–Tropsch catalyst for the direct conversion of syngas to lower olefins. Its catalytic behaviors were compared with ...

Authors Duan Xuezhi Wang Di Qian Gang Walmsley John Charles Holmen Anders Chen De Zhou Xinggui
Year 2016
Type Journal article
Publication

One-step electrochemical synthesis of tunable nitrogen-doped graphene

http://www.sintef.no/en/publications/publication/?pubid=CRIStin+1381508

A one-step electrochemical approach for the production of tunable nitrogen-doped graphene has been developed in this work. The simultaneous production and nitrogen incorporation of graphene are realized by electrochemical exfoliation of graphite in an aqueous electrolyte containing (NH4)2SO4 and NH3...

Authors Lou Fengliu Buan Marthe Emelie Melandsø Muthuswamy Navaneethan Walmsley John Charles Rønning Magnus Chen De
Year 2016
Type Journal article
Publication

Pd/CeO2 catalysts as powder in a fixed-bed reactor and as coating in a stacked foil microreactor for the methanol synthesis.

http://www.sintef.no/en/publications/publication/?pubid=CRIStin+1399533

Pd/CeO2 as a catalyst for methanol synthesis has been studied in a microreactor consisting of 14 structured foils in a fixed-bed laboratory reactor. Methanol synthesis was carried out at 80 bar and 300 °C with a syngas composition of H2/CO/CO2/N2 = 65/25/5/5. It was found that Pd/CeO2 as a foil coat...

Authors Phan Xuyen Kim Walmsley John Charles Bakhtiary Davijany Hamidreza Myrstad Rune Pfeifer Peter Venvik Hilde Johnsen Holmen Anders
Year 2016
Type Journal article
Publication

Boosted Supercapacitive Energy with High Rate Capability of aCarbon Framework with Hierarchical Pore Structure in an Ionic Liquid

http://www.sintef.no/en/publications/publication/?pubid=CRIStin+1405400

The specific energy of a supercapacitor (SC) with an ionic liquid (IL)-based electrolyte is larger than that using an aqueous electrolyte owing to the wide operating voltage window provided by the IL. However, the wide-scale application of high-energy SCs using ILs is limited owing to a serious redu...

Authors Wang Xuehang Zhou Haitao Lou Fengliu Li Yahao Buan Marthe Emelie Melandsø Duan Xuezhi Walmsley John Charles Sheridan Edel Chen De
Year 2016
Type Journal article
Publication

Combined X-ray and Raman studies on the effect of cobalt additives on the decomposition of magnesium borohydride

http://www.sintef.no/en/publications/publication/?pubid=CRIStin+1300601

Magnesium borohydride (Mg(BH4)2) is one of the most promising hydrogen storage materials. Its kinetics of hydrogen desorption, reversibility, and complex reaction pathways during decomposition and rehydrogenation, however, present a challenge, which has been often addressed by using transition metal...

Authors Zavorotynska Olena Deledda Stefano Vitillo Jenny G. Saldan Ivan Guzik Matylda Natalia Baricco Marcello Walmsley John Charles Muller Jiri Hauback Bjørn
Year 2015
Type Journal article
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