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A T-Nb2O5/CNT nanohybrid with short transmission paths, many active sites, and favorable mechanical flexibility can achieve the fast transportation of ions/electrons. The obtained nanohybrid with continuous conductive networks exhibited better lithium storage performance than sodium storage performance, due to lower resistance to the diffusion of Li+ ions crossing the carbon matrix. [ABSTRACT FROM AUTHOR]

• G-CNTs-FeCo grown by vertically electrochemical exfoliation and hydrothermal. • FeCo growing on graphene can enhance electrochemical performance. • FeCo acts as catalyst for growing CNTs on graphene. • Electrochemical performance of G-CNTs-FeCo is better than pure graphene. • CNTs and FeCo growing on the graphene enhance conductivity and capacity. In this work, we grow CNTs on electrochemical exfoliation graphene with few FeCo(G-CNTs-FeCo) by hydrothermal as a new supercapacitors electrode. It has excellent specific capacitance (560.26 F/g at 1 mV/s) and low charge transfer resistance (30.79 Ω). The supercapacitor electrode exhibits better electron conductivity and electrochemical performance than pure graphene which was found to combine the merit of graphene, CNTs and FeCo metals. This paper would help to provide a method to improve graphene SCs performance. [ABSTRACT FROM AUTHOR]

Highlights: [•] Co3O4/MWCNT hybrids were synthesized via ultra-sonication assisted shaking process. [•] The resulting Co3O4 nanoparticles are highly dispersed onto MWCNT network backbone. [•] Co3O4/MWCNT hybrid displays highly enhanced lithium storage properties. [•] The present synthetic approach is facile, controllable, and scalable. [Copyright &y& Elsevier]

Constructing Co-based carbon nanotubes/g-C 3 N 4 structure via integrated strategy remains a challenge in cobalt-based electrocatalysis. We firstly proposed a coordination-polymerization integrated strategy for the preparation of Co@N-CNT@g-C 3 N 4 with efficient hydrogen evolution reaction at all pH values. In Co@N-CNT@g-C 3 N 4 , Co nanoparticles were encapsulated in the tip of carbon nanotubes and carbon nanotubes grew on g-C 3 N 4 to bridge Co particles and g-C 3 N 4. More importantly, Co particles, carbon nanotubes, and g-C 3 N 4 were assembled simultaneously skillfully to construct a closely integrated interface, thereby enhancing electron transfer efficiency. Electrochemical tests showed that the structure has high catalytic activity, with overpotentials of 61, 145, and 170 mV in 1 M KOH, 0.5 M H 2 SO 4 and 1.0 M phosphate buffer saline (PBS), respectively, to drive 10 mA cm−2. Additionally, the Gibbs free energy for hydrogen adsorption (∆G H *) on the Co surface of Co@N-CNT@g-C 3 N 4 was only − 0.13 eV, which was conducive to H 2 formation. [Display omitted] • A unique coordination-polymerization integrated strategy was firstly proposed. • Co@CNT@CN showed low overpotentials (61, 145, and 170 mV) in different electrolytes. • The high capability was due to Co@carbon nanotubes and closely integrated CNT/g-C 3 N 4. • Co NPs. CNTs. g-C 3 N 4 served as H* combination. e- migration, H 2 O adsorption sites. [ABSTRACT FROM AUTHOR]