Shape effects of cuprous oxide particles on stability in water and photocatalytic water splitting

Abstract

The stability of different shapes of cuprous oxides was tested in deionized water with or without light irradiation. The morphology was degraded by the formation of CuO at the surface differently with each shape. TiIrOx-coated Cu2O particles presented improved stability for overall water splitting producing hydrogen and oxygen.

Synthesis of Ultrasmall Cu2O Nanocubes and Octahedra with Tunable Sizes for Facet-Dependent Optical Property Examination

“…[1][2][3][4][5][6][7][8][9] Even heat transmission has been found to show facet dependence. [ 10 ] Unlike organocatalysis, which deals with only surface atoms, [4][5][6][7] photocatalytic, electrical, and optical properties involve with charge carriers or photons moving into or out of a crystal through the particle surfaces.…”

“…These small and surfactant-free octahedra are expected to show enhanced catalytic activities. [7] Cu 2 O particles should form through the reduction of Cu(OH) 2 To synthesize small Cu 2 O nanocubes with tunable size, 100 μL of 0.1 m CuSO 4 solution and 350-700 μL of 1.0 m NaOH solution were first mixed in a vial placed in a 35 °C water bath. After 500 μL of 0.2 m ascorbic acid solution was added, the solution was stirred for 10 min for particle growth (see Table S3 in the Supporting Information for the reaction summary).…”

Photocatalysis for Hydrogen Production and CO2 Reduction: The Case of Copper‐Catalysts

“…In addition, proper choice of the coupled SC may lead on efficient charge transport protecting Cu x O from photocorrosion phenomena. Photocorrosion has been correlated both with Cu 2 O oxidation to CuO and CuO reduction to Cu 2 O . Nevertheless, the presence of both Cu + and Cu 2+ in the oxide has been shown beneficial in some cases.…”

“…The shape of metal oxide nanoparticles via controlling the relative growth rates along various crystallographic directions and therefore, allowing the preferential growth of specific facets can affect significantly the activity and stability of photocatalysts ,. In general, surfactants, differing in the binding behavior to specific facets of a crystal during the growing step, permit size and shape control.…”

“…Kwon et al. demonstrated the effect of Cu 2 O particle shape on the stability and H 2 evolution from water splitting. The authors observed that photocorrosion and phase transformation from Cu 2 O to CuO followed the order of: rhombic dodecahedra Cu 2 O (with exposed (110) facets)>cubic Cu 2 O (with (100) facets)∼octahedra Cu 2 O with (111) facets (Figure ).…”