MXene-Mediated Electronic State Engineering of Nickel Hydroxide for Efficient Piezo-Catalytic Hydrogen Peroxide Synthesis

• DOI: 10.1021/acs.jpclett.5c00685
• Publication Date: 2025-05-05T18:43:28Z
• Authors: Yuxiu Sun; Jiahao Liu; Zhaorui Zhang; Chenshuai Han; Weiliang Qi; Jinkui Chu; Siqi Liu; Minghui Yang
• Keywords: Peroxide

The piezo-catalytic synthesis of hydrogen peroxide (H2O2) offers a sustainable alternative to the traditional anthraquinone process by enhancing both water oxidation reaction (WOR) and oxygen reduction (ORR). However, conventional high-dielectric-constant piezoelectric materials, despite their superior responses, generally feature wide band gaps, low electrical conductivity, limited number active sites─catalytically unfavorable characteristics that restrict piezocatalytic efficiency. To address this, we developed 2D Ni(OH)2-Ti3C2Tx MXene composite for efficient H2O2 production in pure water. Ti3C2Tx modifies electronic states Ni(OH)2, its deprotonation ability (Ni2+ Ni3+) creating hypervalent nickel sites boost synthesis. Theoretical experimental studies confirm generation occurs through combined WOR ORR pathways, with being dominant. hierarchical nanosheet structure facilitates crystal deformation under mechanical stress, amplifying effect reducing energy input required redox reactions. As result, achieves an impressive yield 351.1 μmol·g-1·h-1. This work provides novel design strategy high-performance piezo-catalysts production.