Nickel iron phosphide ultrathin nanosheets anchored on nitrogen-doped carbon nanoflake arrays as a bifunctional catalyst for efficient overall water splitting. Issue 15 (2nd April 2020)

• Record Type: Journal Article
• Authors: Bian, Jialin; Song, Zeyi; Li, Xianglin; Zhang, Yuzhong; Cheng, Chuanwei
• Is Part Of: Nanoscale. Volume 12:Issue 15(2020)
• Page Start: 8443
• Page End: 8452
• Publication Date: 2020-04-02
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c9nr10471b
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : An efficient and durable bifunctional catalyst of NiFeP ultrathin nanosheets anchored on nitrogen-doped carbon nanoflake arrays is designed for overall water splitting. Abstract : Development of high-efficiency and Earth-abundant bifunctional catalysts for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is desirable to realize an efficient overall water splitting process. In this work, a highly active and durable bifunctional catalyst of coral-like nickel iron phosphide ultrathin nanosheets anchored on nitrogen-doped carbon nanoflake arrays on carbon cloth (CC-NC-NiFeP) was fabricated by using metal organic framework (MOF) derived nitrogen-doped carbon nanoflake arrays as catalyst supports. Combined with the electronic structure regulation by bimetallic phosphides and using three dimensional nitrogen-doped carbon nanoflakes as supports that provide a large specific surface area as well as fast charge/mass transport, the as-prepared CC-NC-NiFeP yields excellent bifunctional electrocatalytic activity in both the HER and OER in an alkaline medium with an overpotential of 94 mV and 145 mV to reach a current density of 10 mA cm −2, respectively. Meanwhile, the CC-NC-NiFeP can behave as both a cathode and anode simultaneously for overall water splitting, achieving a low cell voltage of 1.54 V to reach a current density of 10 mA cm −2, which outperforms that of most of the non-precious metal based catalysts.