Hollow Co_(2)P/Co-carbon-based hybrids for lithium storage with improved pseudocapacitance and water oxidation anodes

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.