MOF and HrGO co-modified bismuth vanadate electrode as well as preparation method and application thereof
A technology of bismuth vanadate and co-modification, applied in the field of photoelectric catalytic electrode materials, can solve the problems of inability to directly apply electrode preparation and implementation, and achieve the effects of good photoelectric catalytic activity, high photocurrent, and improved photoelectric conversion efficiency.
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Embodiment 1
[0040] A method for preparing a photoelectric catalytic electrode includes the following steps:
[0041] (1) Add 0.3234g Bi(NO) 3 ·5H 2 Dissolve O in 1mL concentrated nitric acid (70wt%), then add 2mL distilled water, mix well and add 0.078g NH 4 VO 3 And 0.167g polyvinyl alcohol (PVA, 99%) were dissolved in the above solution, and the seed solution was obtained by ultrasonic for 30 minutes.
[0042] (2) Smear 20μL of seed solution on clean FTO, dry in vacuum for 1 hour, and calcinate in a muffle furnace at 450°C for 2 hours.
[0043] (3) Add 0.06mmol Bi(NO) 3 ·5H 2 O and 0.06mmol NH 4 VO 3 Dissolve in 400μL concentrated nitric acid (70wt%), add distilled water to 15mL, put it into the autoclave, put the conductive surface down, put the BiVO obtained after step (2) burned in the muffle furnace 4 The slices were hydrothermally heated at 180°C for 12h, washed with distilled water and calcined in a muffle furnace at 450°C for 2h to obtain BiVO 4 electrode.
[0044] (4) Dissolve 0.75mmol 2...
Embodiment 2
[0047] Preparation of BiVO in this example 4 / NH 2 MIL125-GO and BiVO 4 / NH 2 The method of MIL125-rGO electrode, the process is basically the same as in Example 1, the difference is:
[0048] After mixing the two solutions uniformly in step (4), add 2mg GO and 2mg rGO respectively, sonicate for 30 minutes and mix them evenly into the autoclave, and put the prepared BiVO respectively 4 The electrode is placed in it with the conductive surface facing down, and solvothermally heated at 150°C for 12 hours to obtain BiVO 4 / NH 2 MIL125-GO electrode and BiVO 4 / NH 2 MIL125-rGO electrode.
[0049] The GO and rGO used in this example were prepared by the following methods:
[0050] The modified Hummers method is used to prepare graphene oxide (GO) with natural graphite powder as raw material and chemical oxidation method; rGO is prepared by chemical synthesis method, and the prepared graphene oxide is pre-reduced with sodium borohydride at 80°C for 1 hour, then Sulfonate with aryl diazonium...
Embodiment 3
[0052] Preparation of BiVO in this example 4 / NH 2 The method of MIL125 electrode, the process is basically the same as in Example 1, the difference is:
[0053] After stirring the two solutions evenly in step (4), put them directly into the prepared BiVO 4 The electrode is placed in it with the conductive surface facing down, and solvothermally heated at 150°C for 12 hours to obtain BiVO 4 / NH 2 MIL125 electrode.
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