Razmjooei, Fatemeh Sanaz und Liu, Taikai und Aguiar Azevedo, Daniela und Hadjixenophontos, Efi und Reissner, Regine und Schiller, Günter und Ansar, Syed Asif und Friedrich, Kaspar Andreas (2020) Improving plasma sprayed Raney type nickel-molybdenum electrodes towards high performance hydrogen evolution in alkaline medium. Scientific Reports, 10 (1), Seite 10948. Nature Publishing Group. doi: 10.1038/s41598-020-67954-y. ISSN 2045-2322.
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Kurzfassung
Rationally designed free standing and binder free Raney type nickel–molybdenum (ni–Mo) electrodes produced via atmospheric plasma spraying (APS) are developed by correlating APS process parameters with the microstructure of electrodes and their electrochemical performance in alkaline media. the results revealed that the electrode morphology and elemental composition are highly affected by the plasma parameters during the electrode fabrication. It is found that increasing plasma gas flow rate and input plasma power resulted in higher in-flight particle velocities and shorter dwell time, which in result delivered electrodes with much finer structure exhibiting homogeneous distribution of phases, larger quantity of micro pores and suitable content of Ni and Mo. Tafel slope of electrodes decreased with increasing the in-flight particles velocities from 71 to 33 mV dec-1 in 30 wt.% KOH. However, beyond a critical threshold in-flight velocity and temperature of particles, electrodes started to exhibit larger globular pores and consequently reduced catalytic performance and higher Tafel slop of 36 mV dec-1 in 30 wt.% KOH. Despite slightly lower electrochemical performance, the electrodes produced with highest plasma gas flow and energy showed most inter-particle bonded structure as well as highest stability with no measurable degradation over 47 days in operation as HER electrode in 30 wt.% KOH. The Raney-type Ni–Mo electrode fabricated at highest plasma gas flow rate and input plasma power has been tested as HER electrode in alkaline water electrolyzer, which delivered high current densities of 0.72 and 2 A cm-2 at 1.8 and 2.2 V, respectively, representing a novel prime example of HER electrode, which can synergistically catalyze the HER in alkaline electrolyzer. This study shows that sluggish alkaline HER can be circumvented by rational electrode composition and interface engineering.
elib-URL des Eintrags: | https://elib.dlr.de/137805/ | ||||||||||||||||||||||||||||||||||||
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Dokumentart: | Zeitschriftenbeitrag | ||||||||||||||||||||||||||||||||||||
Titel: | Improving plasma sprayed Raney type nickel-molybdenum electrodes towards high performance hydrogen evolution in alkaline medium | ||||||||||||||||||||||||||||||||||||
Autoren: |
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Datum: | 1 Dezember 2020 | ||||||||||||||||||||||||||||||||||||
Erschienen in: | Scientific Reports | ||||||||||||||||||||||||||||||||||||
Referierte Publikation: | Ja | ||||||||||||||||||||||||||||||||||||
Open Access: | Ja | ||||||||||||||||||||||||||||||||||||
Gold Open Access: | Ja | ||||||||||||||||||||||||||||||||||||
In SCOPUS: | Ja | ||||||||||||||||||||||||||||||||||||
In ISI Web of Science: | Ja | ||||||||||||||||||||||||||||||||||||
Band: | 10 | ||||||||||||||||||||||||||||||||||||
DOI: | 10.1038/s41598-020-67954-y | ||||||||||||||||||||||||||||||||||||
Seitenbereich: | Seite 10948 | ||||||||||||||||||||||||||||||||||||
Verlag: | Nature Publishing Group | ||||||||||||||||||||||||||||||||||||
ISSN: | 2045-2322 | ||||||||||||||||||||||||||||||||||||
Status: | veröffentlicht | ||||||||||||||||||||||||||||||||||||
Stichwörter: | Plasma spray, Hydrogen evolution reaction, Alkaline media, Raney-Nickel | ||||||||||||||||||||||||||||||||||||
HGF - Forschungsbereich: | Energie | ||||||||||||||||||||||||||||||||||||
HGF - Programm: | Speicher und vernetzte Infrastrukturen | ||||||||||||||||||||||||||||||||||||
HGF - Programmthema: | Elektrolyse und Wasserstoff | ||||||||||||||||||||||||||||||||||||
DLR - Schwerpunkt: | Energie | ||||||||||||||||||||||||||||||||||||
DLR - Forschungsgebiet: | E SP - Energiespeicher | ||||||||||||||||||||||||||||||||||||
DLR - Teilgebiet (Projekt, Vorhaben): | E - Elektrochemische Prozesse (Elektrolyse) (alt) | ||||||||||||||||||||||||||||||||||||
Standort: | Stuttgart | ||||||||||||||||||||||||||||||||||||
Institute & Einrichtungen: | Institut für Technische Thermodynamik > Elektrochemische Energietechnik | ||||||||||||||||||||||||||||||||||||
Hinterlegt von: | Razmjooei, Fatemeh Sanaz | ||||||||||||||||||||||||||||||||||||
Hinterlegt am: | 07 Dez 2020 12:06 | ||||||||||||||||||||||||||||||||||||
Letzte Änderung: | 24 Okt 2023 11:06 |
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