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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 RoySchool of Mechanical Engineering, Yonsei University, Seoul 03722, Republic of KoreaSunil MoonSchool of Mechanical Engineering, Yonsei University, Seoul 03722, Republic of KoreaKwang Hee kimAmar M. PatilSchool of Mechanical Engineering, Yonsei University, Seoul 03722, Republic of KoreaMalik Abdul RehmanNational University of UzbekistanSangHyuk YooSchool of Mechanical Engineering, Yonsei University, Seoul 03722, Republic of KoreaYoungho SeoSchool of Mechanical Engineering, Yonsei University, Seoul 03722, Republic of KoreaJong Hyeok ParkDepartment of Chemical and Biomolecular Engineering, Yonsei University, Seoul 03722, Republic of KoreaKeonwook KangSchool of Mechanical Engineering, Yonsei University, Seoul 03722, Republic of KoreaSeong Chan JunSchool of Mechanical Engineering, Yonsei University, Seoul 03722, Republic of Korea

2022en

Ochiq kirish: yoʻq

ABI

Annotatsiya

Efficient water electrolysis requires highly active electrocatalysts with Pt/RuO 2 -like performance, which remain challenging to synthesize. To develop an ideal universal-pH catalyst, we fabricated N-doped noble metal iridium diphosphide (N-IrP 2 @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 H 2 SO 4 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 IrP 2 surface. Thus, a highly efficient and robust catalyst was developed for commercial water electrolysis.

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Identifikatorlar

DOI: 10.1016/j.apcatb.2022.121906

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