BiOI/Carbon aerogel composite photoanode with enhanced adsorption and Solar-driven photoelectrocatalytic properties
Source abstract
Abstract
Abstract To improve electrical conductivity, reduce the rate of complexation of photogenerated electron-hole pairs, and enhance the catalytic activity of the photoanode, this paper prepared a bismuth iodide/carbon aerogel (BiOI/CA) composite electrode by loading BiOI with a flower sphere-type sheet structure onto a carbon aerogel substrate (CA) by using a simple and green hydrothermal method. The microstructure, elemental composition, and crystalline morphology of the composite electrodes were characterized through a series of tests, which also verified their optical and photocatalytic properties. The rich porous structure of the CA increased the specific surface area of the electrode (366.2 m2g−1), its interfacial interaction with BiOI generated more exposed active sites, and it had strong adsorption that shortened the distance that pollutants needed to travel to reach the surface of the electrode to facilitate the subsequent degradation. In addition, the high conductivity of the composite electrode promoted the rapid transfer of the photogenerated electrons to significantly restrain the compounding of electron-hole pairs and increase the range of absorption of visible light. Based on multiple photoelectric synergistic effects, the prepared electrode exhibited enhanced photocatalytic activity under simulated sunlight, and the optimized BiOI/CA degraded phenol by up to 83.2% within 2 h, three times higher than BiOI/FTO. The capture experiments showed that hydroxyl radicals (⋅OH) and holes (h+) were the main active species in the degradation process. The electrode had not significantly decayed even after five cycles of degradation. In this study, the mechanism of CA as a substrate material for enhancing the catalytic degradation performance of photoanodes was analyzed, and the result here can provide a sound theoretical basis for the design of efficient photoelectrodes and guide their application to wastewater.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advanced Photocatalysis Techniques · Gas Sensing Nanomaterials and Sensors · TiO2 Photocatalysis and Solar Cells
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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