RHE are 24%, 29%, 35% and 39% for BiVO 4 -400, BiVO 4 -450, BiVO 4 -500 and BiVO 4 -540, respectively, showing an increasing trend with the increase in annealing temperature.
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Annealing temperature effects on photoelectrochemical performance of bismuth vanadate thin film photoelectrodes.
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The sentences
The C dl values show a decreasing trend with the increase in the annealing temperature.