High-Efficiency Bimetallic Catalyst Prepared in Situ from Prussian Blue Analogues for Catalytic Water Oxidation

Abstract

The synergistic catalysis of bimetallic catalysts is one of the important ways to improve the catalytic performance; therefore, the development of efficient bimetallic water oxidation catalysts (WOCs) has received extensive attention. This work proposed a bimetallic Fe 3 O 4 /CuO catalyst prepared in situ from the Cu−Fe Prussian blue analogues precursor, promoting Fe 3 O 4modified CuO as a highly efficient and stable bimetallic WOC. The Fe 3 O 4 /CuO exhibits superior and robust catalytic activity for the oxidation of water. Compared with the reported results, it has a higher O 2 evolution rate of about 4406 μmol•h −1 •g −1 and a maximum value for the yield of O 2 as 83.2%, mainly because of the synergetic effect between Fe 3 O 4 and CuO in the complicated water oxidation reaction (WOR) process. We hope this work will be useful for other researchers to design new transition metal bimetallic catalysts for WOR.

Regulation of Morphology and Electronic Structure of NiSe2 by Fe for High Effective Oxygen Evolution Reaction

“…[15] x = 1, 0.9, 0.8, 0.7, 0.6, 0.5. Specifically, (2, 1.8, 1.6, 1.4, 1.2, 1) mmol Ni(NO 3 ) 2 6H 2 O, (0, 0.2, 0.4, 0.6, 0.8, 1) mmol Fe (NO 3 ) 3 9H 2 O, 10 mmol urea and 4 mmol NH 4 F were dissolved in 40 cm 3 water to form a uniform solution, respectively. Then the solution reacted at 120°C for 6 h. After the reaction, the reactor was cooled at room temperature, the product were cleaned three times by water and ethanol, respectively.…”

“…Thirdly, 0.5 mmol NiFe LDH was dispersed into the above solution and ultrasonic for 5 min. Then, the mixture was put into a 100 cm 3 reactor and heated at 180°C for 20 h. Finally, the obtained product was washed with deionized water and ethanol for three times and then drying in a vacuum box. Notably, the whole process is in the atmosphere of N 2 .…”

“…For preparing the working electrodes, 4 mg electrocatalyst material was dispersed in a mixed solvent containing 0.475 cm 3 water and 0.475 cm 3 ethanol followed by ultrasound for 30 minutes. Then, 0.05 cm 3 5 wt% nafion solution was added to the above solution to form slurry. Finally, 0.01 cm 3 Scheme 1.…”

“…In this regard, the electrolytic water equipment, a new energy technology, can be used for energy conversion, which is clean, efficient and recognized by all of us. [3][4][5] The oxygen evolution reaction (OER) is the anode reaction in the electrolytic water equipment. However, the anodic reaction kinetic is slow due to the four electrons transformation.…”

“…It is a good idea to convert solar energy into hydrogen energy. In this regard, the electrolytic water equipment, a new energy technology, can be used for energy conversion, which is clean, efficient and recognized by all of us [3–5] . The oxygen evolution reaction (OER) is the anode reaction in the electrolytic water equipment.…”