Coupling the vanadium-induced amorphous/crystalline NiFe2O4 with phosphide heterojunction toward active oxygen evolution reaction catalysts

• Published in: Nanotechnology reviews (Berlin) Vol. 11; no. 1; pp. 3165 - 3173
• Main Authors: Deng, Hanpeng, Jiang, Hunan, Wang, Kun, Wang, Zhenyu, Wang, Bin, Zhou, Zuowan, Li, Jinyang
• Format: Journal Article
• Language: English
• Published: Berlin De Gruyter 25.11.2022; Walter de Gruyter GmbH
• Subjects: Amorphous structure; Catalysts; Catalytic activity; Conductivity; doping; Education; electrocatalyst; Electrocatalysts; Electrodes; Electrolytes; Electron transfer; Engineering; Ethanol; heterojunction; Heterojunctions; heterophase; Laboratories; Materials science; Nickel ferrites; Nitrates; OER; Oxygen; Oxygen evolution reactions; Phosphides; Scanning electron microscopy; Spectrum analysis; spinel oxide; Synergistic effect; Vanadium; Water splitting
• ISSN: 2191-9089; 2191-9097
• DOI: 10.1515/ntrev-2022-0450

Developing efficient and robust electrocatalysts is increasingly essential for water splitting, severely hindered by the sluggish four-electron transfer process of oxygen evolution reaction (OER). Amorphous/crystalline heterophase engineering has recently emerged as a promising electronic modulation approach for OER catalysts but suffers from poor conductivity of the amorphous structure. Here, we coupled the amorphous/crystalline NiFe induced by vanadium doping with NiP heterojunction, highlighting the synergistic effect in modulating the electronic structures and the complementary effect in promoting conductivity. As a superior electrocatalyst to commercial RuO , the as-prepared NFO-V -P showed a low overpotential of 277 mV at the current density of 20 mA cm , a Tafel slope of 45 mV dec , and long-term stability. The excellent OER catalytic activity is attributed to the synergistic effect at the heterophase interface with rich active sites, fine-tuning of electronic regulation, and enhanced conductivity.