Journal article Open Access

XPS studies on the Mo oxide-based coatings electrodeposited from highly saturated acetate bath

Vernickaitė Edita; Lelis Martynas; Tsyntsaru Natalia; Cesiulis Henrikas


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    <subfield code="c">2020-11-03</subfield>
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    <subfield code="a">This study has partially received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 778357 and from European Social Fund, project No 09.3.3-LMT-K-712-08-0003 under grant agreement with the Research Council of Lithuania.</subfield>
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    <subfield code="a">&lt;p&gt;The possibility to use highly saturated acetate bath to electrodeposit&lt;br&gt;
the mixed-phase materials containing Mo oxides has been investigated.&lt;br&gt;
The XRD characterization revealed that the as-deposited coatings are&lt;br&gt;
amorphous and consist only of MoO2 and MoO3 phases without traces&lt;br&gt;
of metallic Mo phase. This statement has been supported by XPS measurements,&lt;br&gt;
which reveal the presence of three different molybdenum&lt;br&gt;
oxidations states in electrodeposits: Mo4+, Mo5+ and Mo6+. It was found&lt;br&gt;
that the Mo6+ state prevails with 41% of total contribution, whilst Mo5+&lt;br&gt;
and Mo4+ contribute to 28 and 31%, respectively. The deposits retain an&lt;br&gt;
amorphous structure up to 800&amp;deg;C; while molybdenum at this temperature&lt;br&gt;
is predominantly oxidized to the Mo6+ state (91%). These results,&lt;br&gt;
coupled to those of SEM and EDS, revealed that concentrated acetate&lt;br&gt;
bath could be used mainly for the formation of the mixed valence molybdenum&lt;br&gt;
oxide film unlike to the deposition of the metallic Mo phase.&lt;/p&gt;</subfield>
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    <subfield code="u">Lithuanian Energy Institute</subfield>
    <subfield code="a">Lelis Martynas</subfield>
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    <subfield code="u">Vilnius University/Institute of Applied Physics</subfield>
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    <subfield code="a">10.6001/chemija.v31i4.4317</subfield>
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