Pulsed laser deposition of nickel oxide films with improved optical properties to functionalize solar light absorbing photoanodes and very low overpotential for water oxidation catalysis

Rational Design Combining Morphology and Charge-Dynamic for Hematite/Nickel–Iron Oxide Thin-Layer Photoanodes: Insights into the Role of the Absorber/Catalyst Junction

“…On the other hand, the depositions performed with the substrates heated at 300 °C produce a compact morphology, with assembled nanoparticles (see Figure , right column). This effect is due to the higher mobility of the particles when they hit the heated substrate, leading to aggregation and the formation of bigger and partially fused particles, as also observed in the previous characterization of both the single-metal oxides. , …”

“…This effect is due to the higher mobility of the particles when they hit the heated substrate, leading to aggregation and the formation of bigger and partially fused particles, 34 as also observed in the previous characterization of both the singlemetal oxides. 21,35 Further spectroscopic characterization of the thin oxides has been performed by means of micro-Raman analysis, aimed at identifying the amorphous/crystalline nature of the deposited materials. As reported in Figure S1, the Raman spectra of both DEP and AN samples reveal only broad, unresolved features, almost superimposable on those of FTO, thus indicating that the metallic oxides are largely amorphous in nature.…”

Highly Active Binder Free Plasma Sprayed Non-Noble Metal Electrodes for Anion Exchange Membrane Electrolysis at Different Reduced KOH Concentrations

“…After KOH activation O content increases from 3.48 for NiAl-BA to 13.52 wt.% for NiAl-AA ECS Transactions, 92 (8) 689-702 (2019) and from 5.47% for NiAlMo-BA to 13.42 wt.% for NiAlMo-AA. The initial presence of O can be due to plasma spraying in the air and increase of O content after activation can be due to the OHadsorption during the KOH activation process and eventually formation of Ni (OH)2 and also catalyst surface passivation (45)(46)(47). In order to investigate the influence of the different KOH concentration on the AEM electrolyzer performance, electrochemical characterization was performed.…”

Elucidating the Performance Limitations of Alkaline Electrolyte Membrane Electrolysis: Dominance of Anion Concentration in Membrane Electrode Assembly

“…However, the EDX analysis of NiAlMo‐AT shown in Figure d, exhibits the increase of light blue color in the EDX images in the oxygen mapping compare to that of NiAlMo before durability test (Figure S2d of SI), which is overlapping with the space covered with Ni (red). The increase of O content can be due to the OH − adsorption during the electrochemical testing and eventually formation of Ni(OH) 2 . However, as can be seen from SEM images in Figure S2b, S2d of SI and 6b and 6d, the sponge‐like porous morphology of NiAl‐AT and NiAlMo‐AT electrodes is well retained after the durability test, despite partial oxidation and formation of partially Ni oxide or hydroxide, indicating the dimensional robustness of these electrodes.…”

“…After KOH activation, O content increases from 3.48 for NiAl‐BA to 13.52 wt.% for NiAl‐AA and from 5.47 for NiAlMo‐BA to 13.42 wt.% for NiAlMo‐AA. The initial presence of O can be due to plasma spraying in the air and an increase of O content after activation can be due to the OH − adsorption during the KOH activation process and eventually the formation of Ni (OH) 2 and also catalyst surface passivation …”