Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 319, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2022.121906
Keywords
Water electrolysis; Electrocatalyst; Band center; Nitrogen -doped iridium diphosphate; PH universal catalyst
Funding
- national research foundation of Korea (NRF) - Korea government (MIST) [NRF2019R1A2C2090443]
- Ministry of Trade, Industry & Energy (MOTIE, Korea) [20013621]
- Korea Environment Industry & Technology Institute (KEITI) through Technology Development Project for Biological Hazards Management in Indoor Air Program (or Project) - Korea Ministry of Environment (MOE) [ARQ202101038001]
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [2020R1A5A1019131, NRF-2022R1A2C2011266]
- Korea Environmental Industry & Technology Institute (KEITI) [ARQ202101038001] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Developing efficient water electrolysis catalysts remains a challenge. In this study, we synthesized a nitrogen-doped noble metal iridium diphosphide (N-IrP2 @CC) catalyst on a carbon cloth substrate. The catalyst exhibited high catalytic activity due to the phosphorus-rich condition and nitrogen dopants, achieving a high water-splitting current density at low operation voltages.
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.
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