Chemical and morphological transformation of MOF-derived bimetallic phosphide for efficient oxygen evolution

• Published in: Nano energy Vol. 62; pp. 745 - 753
• Main Authors: Wang, Xian, Chai, Lulu, Ding, Junyang, Zhong, Li, Du, Yujing, Li, Ting-Ting, Hu, Yue, Qian, Jinjie, Huang, Shaoming
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.08.2019
• Subjects: Bimetallic phosphide; Carbon material; Metal organic framework; Oxygen evolution reaction; Metal organic framework; Carbon material; Oxygen evolution reaction; Bimetallic phosphide
• ISSN: 2211-2855
• DOI: 10.1016/j.nanoen.2019.06.002

Environmentally friendly and efficient transition metal phosphide (TMP) electrocatalysts for oxygen evolution reaction (OER) are developed to meet the growing demand for clean energy. Here we report a novel and environmentally friendly strategy for the preparation of MOF-derived bimetallic phosphide embedded in the carbonaceous matrix (FeNiP/C). With 3-dimensional hollow barrel shape and high specific surface, FeNiP/C-900 performs excellent OER catalytic performance, reaching a current density of 10 mA cm−2 at an overpotential of 229 mV with a low Tafel slope of 74.5 mV dec−1. Meantime, we explore the thermal conversion mechanism of P-containing MOF and the compositional changes during heat treatment. Schematic illustration represents the synthesis of FeNiP/C composite, which is prepared by the self-assembly of Ni2+, H3TPO, and dabco to form BMM-10 microcrystals, followed by the treatment of the Fe3+ etching and direct pyrolyzation. In-situ formed FeNiP nanoparticles anchored on the carbon layer with 3D hollow structure performs an enhanced electrocatalyst activity for OER. Finally, the transformation mechanism of this P-contained BMM-10 is also well explored. [Display omitted] •A less toxic strategy to prepare porous MOF-derived transition metal phosphide nano-composites.•The as-obtained hollow FeNiP/C-900 nano-composite possesses the high electrocatalytic activity for OER.•The chemical bond and phase changes are discussed to form FeNiP/C nano-particles.