Cobalt/titanium nitride@N-doped carbon hybrids for enhanced electrocatalytic hydrogen evolution and supercapacitance†
b
Hui
Pan
*ac
Abstract
In this work, we demonstrate the synthesis of a composite architecture that is composed of nitrogen-doped carbon encapsulating cobalt and titanium nitride nanoparticles on carbon cloth (Co–TiN@NG-x/CC) for hydrogen evolution reaction and supercapacitor applications. The optimized electrocatalyst, Co–TiN@NG-2/CC, shows a low overpotential of ∼208 mV to drive a current density of 10 mA cm−2 and long-term durability in 1 M KOH. For the supercapacitor (SC), Co–TiN@NG-2/CC exhibits a capacitance of up to 189 mF cm−2 at a current density of 0.5 mA cm−2 and good rate capability. The capacitance can retain ca. 70% of the initial specific capacitance even after 1000 cycles at a current density of 1 mA cm−2. The enhanced hydrogen evolution reaction and supercapacitance are attributed to the synergistic effect between titanium nitride and Co nanoparticles in the N-doped carbon matrix, leading to increased active sites and electrical conductivity.
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