Nano-ferrites for water splitting: Unprecedented high photocatalytic hydrogen production under visible light
AuthorsMangrulkar, Priti A.
Labhsetwar, Nitin K.
Varma, Rajender S.
Rayalu, Sadhana Suresh
KAUST DepartmentBiological and Environmental Sciences and Engineering (BESE) Division
KAUST Catalysis Center (KCC)
Physical Sciences and Engineering (PSE) Division
Permanent link to this recordhttp://hdl.handle.net/10754/562012
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AbstractIn the present investigation, hydrogen production via water splitting by nano-ferrites was studied using ethanol as the sacrificial donor and Pt as co-catalyst. Nano-ferrite is emerging as a promising photocatalyst with a hydrogen evolution rate of 8.275 μmol h -1 and a hydrogen yield of 8275 μmol h -1 g -1 under visible light compared to 0.0046 μmol h -1 for commercial iron oxide (tested under similar experimental conditions). Nano-ferrites were tested in three different photoreactor configurations. The rate of hydrogen evolution by nano-ferrite was significantly influenced by the photoreactor configuration. Altering the reactor configuration led to sevenfold (59.55 μmol h -1) increase in the hydrogen evolution rate. Nano-ferrites have shown remarkable stability in hydrogen production up to 30 h and the cumulative hydrogen evolution rate was observed to be 98.79 μmol h -1. The hydrogen yield was seen to be influenced by several factors like photocatalyst dose, illumination intensity, irradiation time, sacrificial donor and presence of co-catalyst. These were then investigated in detail. It was evident from the experimental data that nano-ferrites under optimized reaction conditions and photoreactor configuration could lead to remarkable hydrogen evolution activity under visible light. Temperature had a significant role in enhancing the hydrogen yield. © 2012 The Royal Society of Chemistry.
SponsorsFinancial support from the CSIR-Network projects NWP0022 and NWP-56 is greatly acknowledged. One of the authors, Priti A. Mangrulkar, would also take the opportunity to sincerely acknowledge the Council of Scientific and Industrial Research (CSIR) India for granting the Senior Research Fellowship. The authors would also like to thank Director, CSIR-NEERI for providing research facilities.
PublisherRoyal Society of Chemistry (RSC)