Synthesis and characterization of wafer-like BiFeO3 with efficient catalytic activity

Low-temperature hydrothermal synthesis of BiFeO3 microcrystals and their visible-light photocatalytic activity

“…Previous studies [22][23][24][25][26][27][28][29][30][31][32] have suggested that the formation process of BFO phase under the hydrothermal condition can be described as the following reactions:…”

Structure and phase transition of BiFeO3 cubic micro-particles prepared by hydrothermal method

“…The largest cube is nearly 30 mm in size and the average cubic size is about 20 mm, which is a big improvement in cubic size and uniformity in comparison with the previous reports by the hydrothermal method [11,16,20,36]. And cubic surfaces are much smooth.…”

“…Fig. 6 shows the XPS spectra of Fe, Bi and O for the BiFeO 3 cubic particles of sample C. The high resolution XPS spectrum of Fe 2p shows the binding energy of 711.08 eV for Fe 2p 3/2 and 724.38 eV for Fe 2p 1/2 with a spin orbit splitting of 13.3 eV, fully consistent with trivalent Fe [20,45]. The high resolution XPS spectrum of Bi 4f shows the two peaks around 159.28 and 164.68 eV relative to Bi 4f 7/2 and Bi 4f 5/2 , representing Bi 3+ valance [13,20,45].…”

“…The high resolution XPS spectrum of Bi 4f shows the two peaks around 159.28 and 164.68 eV relative to Bi 4f 7/2 and Bi 4f 5/2 , representing Bi 3+ valance [13,20,45]. The high resolution XPS spectrum of O1s can be divided to oxygen-metal at 530.58 eV (red solid lines) and surface adsorbed oxygen at 532.68 eV (blue dash lines), respectively [13,20]. The clear binding energy spectra close to the stand spectra reveal the formation of the well-matched BiFeO 3 crystallites.…”

“…Thus, researchers have attempted to control the BiFeO 3 particle shape and size by using hydrothermal or microwave-hydrothermal method [11][12][13][16][17][18]. Pure BiFeO 3 with irregular particles [19], wafer-like particle shapes [20], nanowires [12,21], tubes [22,23], spheres, and cubes [16,24] was synthesized at different KOH concentrations. Previously, we researched the shape evolution of BiFeO 3 particles and synthesized homogenous octahedron BiFeO 3 particles [11] at 200 8C for 12 h with 8 M KOH.…”