Crystalline-amorphous interface of mesoporous Ni2P @ FePOxHy for oxygen evolution at high current density in alkaline-anion-exchange-membrane water-electrolyzer

Abhishek Meena, Pandiarajan Thangavel, Da Sol Jeong, Aditya Narayan Singh, Atanu Jana, Hyunsik Im, Duc Anh Nguyen, Kwang S. Kim

Research output: Contribution to journalArticlepeer-review

123 Scopus citations

Abstract

For industrial high-purity hydrogen production, it is essential to develop low-cost, earth-abundant, highly-efficient, and stable electrocatalysts which deliver high current density (j) at low overpotential (η) for oxygen evolution reaction (OER). Herein, we report an active mesoporous Ni2P @ FePOxHy pre-electrocatalyst, which delivers high j = 1 A cm−2 at η = 360 mV in 1 M KOH with long-term durability (12 days), fulfilling all the desirable commercial criteria for OER. The electrocatalyst shows abundant interfaces between crystalline metal phosphide and amorphous phosphorus-doped metal-oxide, improving charge transfer capability and providing access to rich electroactive sites. Combined with an excellent non-noble metal-based HER catalyst, we achieve commercially required j = 500/1000 mA cm−2 at 1.65/1.715 V for full water-splitting with excellent stability in highly corrosive alkaline environment (30% KOH). The alkaline-anion-exchange-membrane water-electrolyzer (AAEMWE) fabricated for commercial viability exhibits high j of 1 A cm−2 at 1.84 V with long-term durability as an economical hydrogen production method, outperforming the state-of-the-art Pt/C–IrO2 catalyst.

Original languageEnglish
Article number121127
JournalApplied Catalysis B: Environmental
Volume306
DOIs
StatePublished - 5 Jun 2022

Keywords

  • Electrocatalysts
  • Energy conversion
  • High current density
  • Oxygen evolution reaction
  • Water-electrolyzer

Fingerprint

Dive into the research topics of 'Crystalline-amorphous interface of mesoporous Ni2P @ FePOxHy for oxygen evolution at high current density in alkaline-anion-exchange-membrane water-electrolyzer'. Together they form a unique fingerprint.

Cite this