A sustainable photocatalytic pathway for concurrent hydrogen and value-added chemical production utilizing microalgae as bio-scavenger in water

TL;DR

This study introduces a sustainable photocatalytic method using microalgae as a bio-scavenger to enhance green hydrogen production and generate valuable chemicals, while also capturing CO2 during microalgae cultivation.

Contribution

It presents a novel strategy combining microalgae with photocatalysis to maximize hydrogen yield and produce valuable chemicals, advancing green energy and CO2 mitigation.

Findings

Hydrogen production up to 0.990 mmol/g.h without cocatalyst

Hydrogen production up to 3.200 mmol/g.h with platinum cocatalyst

13-fold increase in H2 production with microalgae compared to without

Abstract

Microalgae are an abundant bioorganic material source and play a significant role in life on Earth by conducting photosynthesis for carbon dioxide (CO2) capture and its conversion to oxygen (O2). In this study, a combination of microalgae as a negative-CO2-emitting sacrificial agent with the traditional photocatalytic water-splitting process using brookite TiO2, as a model photocatalyst, is introduced as a new strategy to maximize green hydrogen (H2) production while converting microalgae to valuable products, like methane (CH4) and carbon monoxide (CO). The process, under optimal conditions, produces up to 0.990 mmol/g.h of H2 without cocatalyst addition and 3.200 mmol/g.h with platinum (Pt) cocatalyst, which is 13 times higher than the production rate without microalgae. The strategy of using microalgae in photocatalysis has high potential in green H2 production, as it not only eliminates valuable hole sacrificial agents, like alcohol, but also produces other useful compounds, like CH4 and CO. Moreover, this sustainable process contributes to CO2 capture and conversion during microalgae cultivation.