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

Publication date: Available online 29 August 2019Source: Journal of Materials Science & TechnologyAuthor(s): Lei Hu, Fuxin Wang, M.-Sadeeq Balogun, Yexiang TongAbstractA porous hollow hybrid nanoarchitecture that consist of Co2P/Co nanoparticles confined in nitrogen-doped carbon (NC) and carbon nanotube (CNT) hollow nanocubes (denoted as H-Co2P/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-Co2P/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-Co2P/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 h g-1 at 0.2 A g-1) and high pseudocapacitance behavior. Besides, it also delivers a superior catalytic property for OER with a small Tafel 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 Co2P/Co and NC/CNT, leading to enhanced conductivity through high pseudocapacitance contribution. This present work demonstrates that MOF-derived H-Co2P/Co-NC/CNT hybri...
Source: Journal of Materials Science and Technology - Category: Materials Science Source Type: research