Cocatalysts on Semiconductor Photocatalyst: A Mini Review

Keywords: cocatalyst, photocatalyst, semiconductor, solar energy conversion, water splitting

Abstract

Recent progress in photocatalysts for sunlight energy conversion into chemical energy through water splitting, carbon dioxide (CO2) reduction, nitrogen fixation, etc. has witnessed the importance of cocatalysts in elevating the efficiency of the overall reaction systems. A cocatalyst can assist a semiconductor photocatalyst by promoting the transportation of photoexcited charges (electrons and holes). The improved shuttle of photoexcited charges has direct constructive impacts on the suppression of charge recombination, facilitation of redox reactions with reactants, and prevention of photo-corrosion (in certain photo-unstable semiconductor). Given the critical roles played by cocatalyst, the methodologies adopted in decorating such entities on a semiconductor photocatalyst would have influence in the surface and interfacial interaction between the two components, resulting in the tunability of reaction performance. In this mini review, we aim to summarize the structural configurations of cocatalyst-photocatalyst composites yielded via various loading methods. The implications of the resultant surface and interfacial interaction imposed by the cocatalysts are discussed to provide general guidance for tailoring an ideal photocatalytic system. Subsequently, we summarize the methodologies developed over years in loading of cocatalyst on semiconductor photocatalyst. The challenges presented at the end of this mini review serve as a platform of opportunity for this community to overcome or improve further.

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Author Biography

Yun Hau Ng, School of Energy and Environment, City University of Hong Kong, Hong Kong SAR, China

Foto_Prof YunHau_Ng.jpg

Yun Hau Ng is an associate professor in the School of Energy and Environment, City University of Hong Kong. He received his B.Sc. (Industrial Chemistry) from Universiti Teknologi Malaysia in 2003 and his Ph.D. from Osaka University in 2009. His research is focused on the development of novel photoactive semiconductors for sunlight energy conversion. He is awarded the Honda-Fujishima Prize in 2013 in recognition of his work in photo-driven water splitting. He received the Distinguished Lectureship Award from the Chemical Society of Japan in 2018 and APEC Science Prize for Innovation, Research and Education (ASPIRE) in 2019.

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Cocatalyst is a crucial component to provide efficient photocatalytic system. It serves different functions, ranging from electron sinks for the excited photocatalyst to the passivation role to suppress photo-corrosion of photocatalyst. The methods in loading cocatalyst onto semiconductor photocatalysts can affect the extent of influence. This minireview is, therefore, summarizing the commonly used and newly developed techniques in decorating photocatalyst with cocatalyst.
Published
2019-12-30
How to Cite
Ng, Y. H. (2019). Cocatalysts on Semiconductor Photocatalyst: A Mini Review. Journal of the Indonesian Chemical Society, 2(2), 72. https://doi.org/10.34311/jics.2019.02.2.72