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Rational design of FeS_(2)microspheres as high-performance catalyst for electrooxidation of hydrazine

Journal of Materials Science & Technology 2022年第15期110卷 161-166页

作者： Jie Sun Chuangwei Liu Wenhan Kong Jie Liu Liangyu Ma Song Li Yuanhong Xu Institute of Biomedical Engineering College of Life SciencesCollege of Materials Science and EngineeringQingdao UniversityQingdao 266071China Department of Energy Conversion and Storage Technical University of Denmark2800 Kgs.LyngbyDenmark Key Lab for Anisotropy and Texture of Materials School of Materials Science and Engineering Northeastern UniversityShenyang 110819China

Inspired by the relatively recognized performance of transition metal sulfides in the oxidation of hydrazine,the catalytic properties of FeS_(2) and Fe_(3)S_(4) are compared via the density functional theory *** to the different coordination numbers of iron-sulfur,the free energies of the dehydrogenation steps on FeS_(2) are far less than those on Fe_(3)S_(4),which led to the much better catalytic performance of FeS_(2).Accordingly,FeS_(2) microspheres are rationally proposed as a more efficient electrocatalyst for hydrazine oxidation,which is then prepared by a facile one-step hydrothermal *** FeS_(2)microspheres show great activity for hydrazine oxidation with an onset oxidation potential of 0.22 V *** hydrogen electrode,and a peak current density of 16 m A cm^(-2).Meanwhile,stability and high faradaic efficiency(3.5e-/N_(2)H_(4))is obtained for hydrazine oxidation to N_(2).

关键词： Rational design hydrazine electrooxidation FeS_(2)microspheres Electrochemistry

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Boosting electrocatalytic hydrazine oxidation at single-crystalline Ni nanosheets with embedded NiZn

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Progress in Natural Science:Materials International 2023年第5期33卷 710-717页

作者： Xia Wei Hongbin Dai Chuangwei Liu Song Li School of Material Science and Engineering Northeastern University

hydrazine oxidation reaction(Hz OR) plays a crucial role in direct hydrazine fuel cells and holds promise for replacing the kinetics-sluggish oxygen evolution reaction in splitting water. While Ni–Zn alloys exhibit exceptional activity for Hz OR, their synthesis under mild conditions remains a challenge. Herein, a Ni–Zn nanosheet catalyst with Ni Zn inclusion was prepared on Ni foam by controllable chemical etching together with ethylene glycol reduction. X-ray diffraction and transmission electron microscopy confirmed the single-crystalline nature and the presence of intermetallic Ni Zn. The strong interaction between Ni and Zn O, along with defects, facilitated the formation of this intermetallic compound. The Ni–Zn/Ni foam exhibits remarkable catalytic activity(214.3m A cm-2at 0.1 V) and durability(87.8 % retention after 24 h) towards hydrazine electrooxidation, thanks to the combined benefits of intermetallic Ni Zn, mesoporous nanosheets, microscopic defects, single-crystalline characteristics, and a coherent Ni–Ni Zn interface. This study provides a new method for designing highly active Ni–Zn electrocatalysts for Hz OR.

关键词： hydrazine electrooxidation Intermetallic NiZn Single-crystalline Coherent interface Microscopic defects

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