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Structural transformation of metal–organic framework with constructed tetravalent nickel sites for efficient water oxidation

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Journal of Energy Chemistry 2022年第11期31卷 404-411,I0011页

作者： Weijian Wu Zhen Gao Qun Li Zhiya Wang Shiyin Liu Hongbo Wu Yuanchun Zhao Yalong Jiao Xiaojia Zhao Hebei Key Laboratory of Inorganic Nano-materials College of Chemistry and Materials ScienceHebei Normal UniversityShijiazhuang 050024HebeiChina Hebei Key Laboratory of Photophysics Research and Application College of PhysicsHebei Normal UniversityShijiazhuang 050024HebeiChina State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004HebeiChina

A mixture of Ni and Fe oxides is among the most commonly active catalysts for the oxygen evolution reaction(OER)during the water oxidation process.In particular,Ni oxide incorporated with even a small amount of Fe leads to substantively enhanced OER activity.However,the critical role of Fe species during the electrocatalytic process is still under evaluation.Herein,we report nickel(oxy)hydroxide incorporated with Fe through the surface reconstruction of a bimetallic metal-organic framework(NiFe-MOF)during the water oxidation process.The spectroscopic investigations with theoretical calculations reveal the critical role of Fe in promoting the formation of highly oxidized Ni^(4+),which directly correlates with an enhanced OER activity.Both the geometric and electronic structu res of the as-reconstructed Ni_(1-x)Fe_(x)OOH electrocatalysts can be delicately tuned by the Ni-Fe ratio of the bimetallic NiFe-MOF,further affecting the catalytic activity.As a result,the Ni_(1-x)Fe_(x)OOH derived from Ni_(0.9)Fe_(0.1)-MOF delivers low overpotentials of 260 mV at 10 mA cm^(-2)and 400 mV at 300 mA cm^(-2).

关键词： Structural transformation bimetallic metal-organic framework Oxygen evolution reaction In-situ Raman spectroscopy High-valence metal sites

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Non‑Magnetic bimetallic MOF‑Derived Porous Carbon‑Wrapped TiO2/ ZrTiO4 Composites for Efficient Electromagnetic Wave Absorption

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Nano-Micro Letters 2021年第5期13卷 45-60页

作者： Jing Qiao Xue Zhang Chang Liu Longfei Lyu Yunfei Yang Zhou Wang Lili Wu Wei Liu Fenglong Wang Jiurong Liu School of Materials Science and Engineering Shandong UniversityJinan 250061People’s Republic of China State Key Laboratory of Crystal Materials Shandong UniversityJinan 250100People’s Republic of China

Modern communication technologies put forward higher requirements for electromagnetic wave(EMW)absorption materials.metal-organic framework(MOF)derivatives have been widely concerned with its diverse advantages.To break the mindset of magneticderivative design,and make up the shortage of monometallic non-magnetic derivatives,we first try non-magnetic bimetallic MOFs derivatives to achieve efficient EMW absorption.The porous carbon-wrapped TiO2/ZrTiO4 composites derived from PCN-415(TiZr-MOFs)are qualified with a minimum reflection loss of−67.8 dB(2.16 mm,13.0 GHz),and a maximum effective absorption bandwidth of 5.9 GHz(2.70 mm).Through in-depth discussions,the synergy of enhanced interfacial polarization and other attenuation mechanisms in the composites is revealed.Therefore,this work confirms the huge potentials of nonmagnetic bimetallic MOFs derivatives in EMW absorption applications.

关键词： bimetallic metal-organic framework PCN-415 MOF derivatives TiO2/ZrTiO4/C composites Electromagnetic wave absorption

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