Tuning the band (p and d) center and enhancing the active sites by nitrogen(N) doping on iridium diphosphide (IrP2) for accelerating pH-universal water electrolysis

Sanjib Baran Roy, Sunil Moon, Kwang Hee kim, Amar Patil, Malik Abdul Rehman, Sang Hyuk Yoo, Youngho Seo, Jong Hyeok Park, Keonwook Kang, Seong Chan Jun

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

Efficient water electrolysis requires highly active electrocatalysts with Pt/RuO2-like performance, which remain challenging to synthesize. To develop an ideal universal-pH catalyst, we fabricated N-doped noble metal iridium diphosphide (N-IrP2 @CC) catalyst via three-step synthesis on a carbon cloth substrate. The catalyst showed considerably higher catalytic activity compared with existing transition metal phosphide catalysts due to the P-rich condition and N dopants, achieving an overall water-splitting current density of 100 mA cm−2 at low operation voltages of 1.56 V and 1.64 V in 0.5 M H2SO4 and 1 M KOH, respectively. Density functional theory calculations showed that the N dopant can alter not only the band (d and p) center of Ir and P, but also the charge distribution of the IrP2 surface. Thus, a highly efficient and robust catalyst was developed for commercial water electrolysis.

Original languageEnglish
Article number121906
JournalApplied Catalysis B: Environmental
Volume319
DOIs
Publication statusPublished - 2022 Dec 15

Bibliographical note

Publisher Copyright:
© 2022 Elsevier B.V.

All Science Journal Classification (ASJC) codes

  • Catalysis
  • General Environmental Science
  • Process Chemistry and Technology

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