Enhanced Oxygen Evolution and Zinc‐Air Battery Performance via Electronic Spin Modulation in Heterostructured Catalysts
Source abstract
Abstract
Abstract Beyond optimizing electronic energy levels, the modulation of the electronic spin configuration is an effective strategy, often overlooked, to boost activity and selectivity in a range of catalytic reactions, including the oxygen evolution reaction (OER). This electronic spin modulation is frequently accomplished using external magnetic fields, which makes it impractical for real applications. Herein, spin modulation is achieved by engineering Ni/MnFe2O4 heterojunctions, whose surface is reconstructed into NiOOH/MnFeOOH during the OER. NiOOH/MnFeOOH shows a high spin state of Ni, which regulates the OH− and O2 adsorption energy and enables spin alignment of oxygen intermediates. As a result, NiOOH/MnFeOOH electrocatalysts provide excellent OER performance with an overpotential of 261 mV at 10 mA cm−2. Besides, rechargeable zinc‐air batteries based on Ni/MnFe2O4 show a high open circuit potential of 1.56 V and excellent stability for more than 1000 cycles. This outstanding performance is rationalized using density functional theory calculations, which show that the optimal spin state of both Ni active sites and oxygen intermediates facilitates spin‐selected charge transport, optimizes the reaction kinetics, and decreases the energy barrier to the evolution of oxygen. This study provides valuable insight into spin polarization modulation by heterojunctions enabling the design of next‐generation OER catalysts with boosted performance.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Electrocatalysts for Energy Conversion · Advanced battery technologies research · Fuel Cells and Related Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Catalonia Energy Research Institute – IREC Sant Adrià de Besòs Barcelona Catalonia 08930 Spain
Enginyeria Electrònica i Biomèdica Facultat de Física Universitat de Barcelona Barcelona 08028 Spain
Catalan Institute of Nanoscience and Nanotechnology (ICN2) CSIC BIST Campus UAB Bellaterra 08193 Catalonia Spain
School of Chemistry and Chemical Engineering Yangzhou University Yangzhou 225009 China
Hebei Key Lab of Optic‐electronic Information and Materials College of Physics Science and Technology Hebei University Baoding 071002 China
School of Materials Science and Engineering University of Jinan Jinan 250022 China
Institut de Ciencia de Materials de Barcelona CSIC Campus Universitat Autonoma de Barcelona Bellaterra A08193 Spain
ICREA Pg. Lluis Companys Barcelona Catalonia 08010 Spain
Zhejiang Key Laboratory of Petrochemical Environmental Pollution Control, National Engineering Research Center for Marine Aquaculture Marine Science and Technology College Zhejiang Ocean University Zhoushan Zhejiang Province 316004 China
Funding
Generalitat de Catalunya · European Commission · China Scholarship Council · Ministerio de Ciencia e Innovación · Zhejiang Key Laboratory of Safety Engineering and Technology
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