Hollow Co₂P/Co-carbon-based hybrids for lithium storage with improved pseudocapacitance and water oxidation anodes

Lei Hu¹，Fuxin Wang²，M.-Sadeeq Balogun(Jie Tang)³，Yexiang Tong¹

1. MOE of the Key Laboratory of Bioinorganic and Synthetic Chemistry, The Key Lab of Low-Carbon Chemistry & Energy Conservation of Guangdong Province, School of Chemistry, Sun Yat-sen University2. School of Applied Physics and Materials, Wuyi University3. College of Materials Science and Engineering, Hunan University

摘 要：A porous hollow hybrid nanoarchitecture that consist of Co₂ P/Co nanoparticles confined in nitrogendoped carbon（NC） and carbon nanotube（CNT） hollow nanocubes（denoted as H-Co₂ P/Co-NC/CNT） has been rational designed as anode for lithium ion batteries（LIBs） and electrocatalytic oxygen evolution reaction（OER）.Such design involves simple synthetic process of using metal-organic frameworks（MOFs）as sacrificial precursor.The uniform cubic-shaped H-Co₂ P/Co-NC/CNT hybrid is investigated with several intriguing advantages,including improved structural integrity,superior electronic conductivity,hollow architecture and large specific surface area and so on.The as-synthesized H-Co₂ P/Co-NC/CNT displays excellent lithium storage behaviour in terms of long cycle life（> 500 cycles）,remarkable rate performance(up to 5 A g^-1),high reversible capacity(601 mA hg^-1 at 0.2 A g^-1) and high pseudocapacitance behavior.Besides,it also delivers a superior catalytic property for OER with a small Ta fel slope of 45.3 mV dec^-1 and overpotential of 256 mV(at 10 mA cm^-2).The excellent performance can be attributed to the synergistic effect between Co₂ P/Co and NC/CNT,leading to enhanced conductivity through high pseudocapacitance contribution.This present work demonstrates that MOF-derived H-Co₂ P/Co-NC/CNT hybrid is a promising candidate for high-performance multifunctional energy systems.

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