Activation of urchin-like Ni-doped W18O49/NF by electrochemical tuning for efficient water splitting

• 作者: Guojuan Hai Jianfeng Huang Liyun Cao Koji Kajiyoshi Long Wang Liangliang Feng Jun Chen
• 来源期刊: 能源化学
• 年，卷（期）: 2021,（12）
• 页码范围: 642-650
• 页数: 9页
• 语种: 英文

摘要

The electrochemical conversion is closely correlated with the electrocatalytic activities of the electrocatalyst.Herein,the urchin-like Ni-doped W18O49/NF with enriched active sites was prepared by solvothermal method followed by a low-temperature pyrolysis treatment was reported.Results demonstrate that the incorporation of Ni-doping triggers the lattice distortion of W18O49 for the increase-ment of oxygen defects.Further,high-valent W6+ are partially reduced to low-valent W4+,wherein the electrons originate from the oxidation process of Ni2+ to Ni3+.The Ni3+ ions show an enhanced orbital overlap with the OER reaction intermediates.The generated W4+ ions contribute to release oxygen vacan-cies,eventually reorganizing Ni-doped W18O49/NF to unique electrochemical active species with a special amorphous-crystalline interface (AM/NiWOx/NiOOH/NF).Simultaneously,the reconstruction results in an optimized valence band and conduction band.Eventually,the resultant AM/NiWOx/NiOOH/NF with abundant active sites and improved oxidation/reduction capability exhibits more superior catalytic per-formance compared with the Ni-doped W18O49/NF counterpart.This study gives more insights in the electrochemical evolution of the tungsten-based oxide and provides effective strategies for optimizing the catalytic activity of materials with inherent hydrogen evolution reaction limitations.