Construction of Co-decorated 3D Nitrogen Doped-Carbon Nanotube/ti3c2tx-Mxene As Efficient Hydrogen Evolution Electrocatalyst

Rational design of transition metal catalysts with robust and durable electrocatalytic ac-tivity for hydrogen evolution reactions (HER) is extremely important for renewable energy conversion and storage, as well as water splitting. Heteroatom doping has emerged as a feasible strategy for enhancing electrocatalytic activity. Here, cobalt nanoparticles (Co-NPs) were coated with nitrogen-doped carbon nanotubes (NCNTs) prepared via an in situ growth on accordion-like Ti3C2Tx-MXene (Co-NCNT/Ti3C2Tx). Such an intriguing structure showed great features: abundant anchoring sites for NCNT in situ growth, intimate integration of Co-NPs and NCNTs, high-speed electron transfer between 1D NCNTs and 2D Ti3C2Tx- MXenes, and a large number of effective catalytic active sites. This Co-NCNT/Ti3C2Tx hybrid catalyst was demonstrated to possess excellent HER performance with low over -potential (eta(10), 190 mV), small Tafel slope (78.4 mV dec(-1)), large electrochemically active surface area, and good long-term stability, thus outperforming many reported electrocatalysts. The present strategy provided a facile route for the design of transition metal HER catalysts with NCNT and MXene. (c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.