Visible‐Light‐Induced Photocatalytic Hydrogen Evolution Performance of Graphdiyne‐Alkyne Phosphating Mo–Metal‐Organic Frameworks Heterojunction

Abstract

In order to explore the application of graphdiyne in photocatalytic splitting of water and hydrogen evolution. In this paper, graphdiyne was prepared by ball milling using calcium carbide as raw material, and it was compounded with phosphating Mo‐MOFs, to explore the photocatalytic hydrogen evolution performance and hydrogen evolution mechanism of composite catalysts. The results showed that the PMF/G‐25 composite photocatalyst had the best hydrogen evolution activity, and the hydrogen production rate was highest at pH = 9, reaching 1668.5 µmol·g‐1·h‐1. Through the four‐cycle hydrogen evolution cycle stability test, the PMF/G‐25 composites still had good hydrogen evolution stability. The results showed that the combination of phosphating Mo‐MOFs and graphdiyne could enhance the hydrogen evolution activity and had excellent hydrogen evolution performance. The photoelectrochemical and fluorescence test results showed that the addition of graphdiyne could effectively improve the charge separation efficiency of the composite catalyst PMF/G‐25. The Mott‐Schottky test found that PMF and GDY were n‐type semiconductors, and their band structures were analyzed. The conduction and valence values were ‐0.56 eV and 1.10 eV for GDY, and ‐0.68 eV and 0.97 eV for PMF, respectively. The mechanism of photocatalytic hydrogen evolution was analyzed, and it was speculated that S‐Scheme heterojunction was formed between PMF and GDY to further promote photocatalytic hydrogen evolution.This article is protected by copyright. All rights reserved.