Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 6, Issue 39, Pages 18948-18959Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta06946h
Keywords
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Funding
- IISER Kolkata
- Department of Science and Technology (DST)-Science and Engineering Board (SERB)
- University Grants Commission (UGC), New Delhi
- SERB [EMR/2016/001703]
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Solar-energy-driven overall water splitting using sustainable energy resources is extremely desirable for high purity hydrogen fuel production, and one of the ways is to couple cost-effective solar cells in series with earth-abundant electrocatalysts for oxygen and hydrogen evolution reactions, OER and HER, respectively. Developing highly efficient and earth-abundant electrocatalysts however remains one of the grand challenges. Herein, we developed biomass (duckweed, DW) derived N,S-doped mesoporous carbon matrix supported NiFe-alloy nanoparticles (NPs) as efficient electrocatalysts for overall water splitting. While the annealed catalyst required 267 mV overpotential at 10 mA cm(-2) for the OER, the best HER performance was demonstrated by the unannealed electrocatalyst requiring 106 mV at -10 mA cm(-2) in 1 M KOH. For overall water splitting, this couple required only 1.61 V cell voltage to deliver 10 mA cm(-2), with continuous release of O-2 and H-2 gas bubbles for more than 200 h. On integrating with perovskite solar cells, the homologous DW electrolyzer exhibited unassisted solar-energy-driven overall water splitting with a solar-to-hydrogen (STH) conversion efficiency of 9.7%.
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