Abstract:
:The effect of substrate surface roughening on the capacitance of Ni(OH)2/NiOOH nanowall array samples produced via chemical bath deposition for 2, 4, 6, 24 and 48 h on an as-received stainless steel substrate and the same substrate after sandblasting has been investigated. Symmetric cells were subjected to 120,000 charge-discharge cycles to access changes in their capacitance. Specific capacitances were derived from cyclic voltammetry and charge-discharge cycling under a three electrode setup. Substrate roughening significantly increases the capacitance of symmetric cells and film stability since film exfoliation does not occur to the same degree as on the as-received substrate. Interestingly, films deposited on a roughened substrate for 6, 24 and 48 h also exhibit self-recovery of capacitance, which could be related to an electrodissolution-electrodeposition effect. With the use of a roughened substrate, the thinnest film gives the highest specific capacitance, 1456 F g-1, whilst the thickest one shows the highest areal capacitance, 235 mF cm-2, after 20,000 cycles. These results reveal the promise of surface roughening toward increasing the capacitance and stability of Ni(OH)2/NiOOH films.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Pimsawat A,Tangtrakarn A,Pimsawat N,Daengsakul Sdoi
10.1038/s41598-019-53365-1subject
Has Abstractpub_date
2019-11-14 00:00:00pages
16877issue
1issn
2045-2322pii
10.1038/s41598-019-53365-1journal_volume
9pub_type
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