Alkaline Water Splitting Using Hafnium‐Based Stable and Efficient Bifunctional Electrocatalyst

Abstract The desire to achieve sustainable development goals inspired exploring green energy as a favorable alternative to hazardous fossil fuel‐based energy. Alkaline water electrolysis is a promising candidate for producing low‐cost pure green hydrogen; however, the efficiency of non‐precious tran...

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Bibliographic Details
Published inChemCatChem Vol. 15; no. 15
Main Authors Chauhan, Deepak, Itagi, Mahesh, Ahn, Young‐Ho
Format Journal Article
LanguageEnglish
Published Weinheim Wiley Subscription Services, Inc 07.08.2023
Subjects
Bimetals
Clean energy
Current density
Electrocatalysts
Electrolysis
Fossil fuels
Graphene
Green hydrogen
Hafnium
Hydrogen evolution reactions
Hydrogen production
Noble metals
Oxygen evolution reactions
Stability
Sustainable development
Water splitting
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Summary:Abstract The desire to achieve sustainable development goals inspired exploring green energy as a favorable alternative to hazardous fossil fuel‐based energy. Alkaline water electrolysis is a promising candidate for producing low‐cost pure green hydrogen; however, the efficiency of non‐precious transitional metal‐based catalysts is still behind noble electrocatalysts (like Pt and IrO 2 ). To make hydrogen a next‐generation fuel, the replacement of high‐cost scarce noble metal is required. An attempt has been made to use a non‐precious transitional bimetallic combination of hafnium nickel diselenide/ reduced graphene oxide (HfNiSe 2 /rGO) for HER, OER, and overall water splitting. HfNiSe 2 /rGO demonstrated good electrocatalytic performance; for achieving 10 mA/cm 2 of current density, the overpotential requirement is 162 mV for hydrogen evolution reaction (HER) and 320 mV for oxygen evolution reaction (OER) at 20 mA/cm 2 of current density. Similarly, a low Tafel slope is required, 49 mV dec −1 for HER and 66 mV dec −1 for OER in 1 M KOH with high stability. HfNiSe 2 /rGO also showed highly stable activity for overall water splitting, requiring only 1.56 V to attain 10 mA/cm 2 of current density. The result indicates HfNiSe 2 /rGO is a suitable electrocatalyst for green hydrogen generation because of its ease of production, economical, good activity, and stability towards water splitting.
ISSN:1867-3880
1867-3899
DOI:10.1002/cctc.202300562