A critical and benchmark comparison on graphene-, carbon nanotube-, and fullerene-semiconductor nanocomposites as visible light photocatalysts for selective oxidation

A systematic comparison between graphene (GR)–semiconductor CdS and its analogs fullerene (C60) and carbon nanotube (CNT)–semiconductor CdS composite photocatalysts for selective oxidation of alcohols has been carried out based on a reasonable benchmark framework. The results reveal that GR cannot manifest its unique advantage over its carbon allotropes in enhancing the photoactivity of semiconductor CdS. The primary roles of these carbon allotropes (C60, CNT, and GR) are found to be quite similar in terms of structure–photoactivity correlation analysis. Overall, this work highlights that (i) the exponential increase in publications on GR–semiconductor photocatalysts has not been matched by increases in our knowledge regarding the similarity and difference of these carbon allotropes in relation to improving the photocatalytic performance of semiconductors; (ii) efforts should be more rationally focused on how to make the best use of remarkable properties of GR in designing more efficient GR-based semiconductor composite photocatalysts, thereby advancing the sufficient realization of GR’s potential in constructing efficient GR–semiconductor photocatalysts for solar energy conversion.

A critical and systematic comparison between graphene-semiconductor and its analog (carbon nanotube, fullerene)-semiconductor composite photocatalysts has been carried out, taking CdS as an example semiconductor and selective oxidation of alcohols under ambient conditions as model reactions, revealing that the primary roles of these carbon allotropes are quite similar, and graphene cannot manifest its unique and prominent advantage over its carbon forebears in enhancing the photoactivity of semiconductor CdS.Figure optionsDownload high-quality image (248 K)Download as PowerPoint slideHighlights
► Intimate interfacial contact for CdS–carbon composite photocatalysts is achieved.
► A first systematic and critical comparison study in a reasonable benchmark framework is presented.
► The primary role of these carbon allotropes is found to be quite similar.
► Graphene fails to show prominent advantage over its carbon forebears in this study.
► Mismatch exists in the increase degree in publications and our knowledge on graphene-semiconductor composites photocatalysis.