A porous heterostructure catalyst for oxygen evolution: synergy between IrP2 nanocrystals and ultrathin P, N-codoped carbon nanosheets. (25th March 2021)

• Record Type: Journal Article
• Authors: Yang, Xiaohui; Zi, Xiangrong; Wang, Yanwei; Zhang, Han; Ma, Jin-Ling; Fang, Ling; Zhang, Huijuan; Li, Jian; Wang, Yu
• Is Part Of: Nanotechnology. Volume 32:Number 24(2021)
• Publication Date: 2021-03-25
• Subjects: iridium diphosphide -- heterostructure -- oxygen evolution; Nanotechnology -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Publications périodiques; Nanotechnologies; Periodicals; 620.5
• DOI: 10.1088/1361-6528/abecb6
• Languages: English
• ISSNs: 0957-4484

Abstract

Abstract: Designing efficient and robust oxygen evolution reaction (OER) electrocatalysts is of great importance for various electrochemical energy storage and conversion applications. Herein, we developed IrP2 nanocrystals uniformly anchored in P, N-codoped carbon nanosheets (IrP2 @PNC-NS) as highly active OER electrocatalysts. The ultrathin PNC-NS reconstructs an agaric-like porous structure, which can inhibit the agglomeration of the IrP2 nanocrystals effectively. Moreover, the in-situ phosphatization leads to the formation of a strong electron interaction between PNC-NS and IrP2 nanocrystals, endowing the heterostructure materials with satisfying synergistic effects. Benefiting from the collaborative advantages of ideal configuration structure and favorable synergistic effects, IrP2 @PNC-NS exhibits excellent OER performance with a low overpotential of 221 mV at 10 mA cm −2, and a small Tafel slope of 37.5 mV dec −1 . DFT calculations reveal that the synergistic effects derived from the IrP2 /PNC interfaces, which can effectively tune the activation barriers towards facilitating the oxygen evolution process. This work provides new insight into the design of heterostructure materials for advanced OER electrocatalysts.