Amorphous Ni–Fe–Mo Oxides Coupled with Crystalline Metallic Domains for Enhanced Electrocatalytic Oxygen Evolution by Promoted Lattice‐Oxygen Participation

Author:

Fan Jiayao12,Zhang Xinyu1,Han Min134,Xiang Xing3,Guo Cong1,Lin Yue2,Shi Naien3,Xu Dongdong1,Lai Yu3,Bao Jianchun1

Affiliation:

1. Jiangsu Key Laboratory of New Power Batteries and Jiangsu Key Laboratory of Biofunctional Materials School of Chemistry and Materials Science Nanjing Normal University Nanjing 210023 P. R. China

2. Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of China Hefei 230026 P. R. China

3. Fujian Cross Strait Institute of Flexible Electronics (Future Technology) Fujian Normal University Fuzhou 350117 P. R. China

4. State Key Laboratory of Coordination Chemistry Nanjing National Laboratory of Solid State Microstructures Nanjing University Nanjing 210093 P. R. China

Abstract

AbstractThe crystalline/amorphous heterophase nanostructures are promising functional materials for biomedicals, catalysis, energy conversion, and storage. Despite great progress is achieved, facile synthesis of crystalline metal/amorphous multinary metal oxides nanohybrids remains challenging, and their electrocatalytic oxygen evolution reaction (OER) performance along with the catalytic mechanism are not systematically investigated. Herein, two kinds of ultrafine crystalline metal domains coupled with amorphous Ni–Fe–Mo oxides heterophase nanohybrids, including Ni/Ni0.5‐aFe0.5Mo1.5Ox and Ni‐FeNi3/Ni0.5‐bFe0.5‐yMo1.5Ox, are fabricated through controllable reduction of amorphous Ni0.5Fe0.5Mo1.5Ox precursors by simply tuning the amount of used reductant. Due to the suited component in metal domains, the special structure with dense crystalline/amorphous interfaces, and strong electronic coupling of their components, the resultant Ni‐FeNi3/Ni0.5‐bFe0.5‐yMo1.5Ox nanohybrids show greatly enhanced OER activity with a low overpotential (278 mV) to reach 10 mA cm−2 current density and ultrahigh turnover frequency (38160 h−1), outperforming Ni/Ni0.5‐aFe0.5 Mo1.5Ox, Ni0.5Fe0.5Mo1.5Ox precursors, commercial IrO2, and most of recently reported OER catalysts. Also, such Ni‐FeNi3/Ni0.5‐bFe0.5‐yMo1.5Ox nanohybrids manifest good catalytic stability. As revealed by a series of spectroscopy and electrochemical analyses, their OER mechanism follows the lattice‐oxygen‐mediated (LOM) pathway. This work may shed light on the design of advanced heterophase nanohybrids, and promote their applications in water splitting, metal‐air batteries, or other clean energy fields.

Funder

National Natural Science Foundation of China

National Key Research and Development Program of China

Priority Academic Program Development of Jiangsu Higher Education Institutions

Publisher

Wiley

Subject

Biomaterials,Biotechnology,General Materials Science,General Chemistry

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