REvolutionized Construction of HEteRojunCtions for pHotocatalytic CO2 rEduction

Harnessing solar energy through photocatalytic CO2 reduction (PCR) is a promising means to address the escalating environmental challenges and energy crises simultaneously. One of the primary challenges in photocatalysis and PCR is the issue of charge carrier recombination within semiconductor heterojunctions. While these heterostructures promise to improve charge separation, internal recombination processes can undermine their efficiency. To address this challenge, the proposal describes a novel method for optimizing charge carrier diffusion lengths within materials. This strategy involves a two-step process. The first step is to prepare each semiconductor component individually, with particle size proportional to charge carrier diffusion length, and then assemble them using the electrostatic self-assembly technique to fabricate tandem Z scheme heterostructures. Balancing the generation of electrons within heterojunction systems is another critical factor in achieving efficient charge transfer. The proposal suggests considering the optical absorption coefficient of semiconductors within the heterojunction, drawing inspiration from the solar cell field. This approach can potentially revolutionize heterojunction design and enhance the charge carrier separation and the efficiency of photocatalytic CO2 reduction. The overarching research objective is to understand the limitations of current heterogeneous photocatalysts and design novel tandem Z scheme photocatalysts. The focus is optimizing absorption coefficients and diffusion lengths and constructing novel tandem Z scheme configurations. Advanced analytical techniques will validate the success of these heterostructures, contributing to the development of efficient photocatalytic systems. These innovations promise enhanced charge transfer, redox potential optimization, and overall performance in the context of photocatalytic CO2 reduction.