Enhanced electrocatalytic activity of Co@N-doped carbon nanotubes by ultrasmall defect-rich TiO2 nanoparticles for hydrogen evolution reaction
ultrasmall nanoparticle, TiO2, defect structure, carbon nanotube, hydrogen-evolution reaction
ABSTRACT Despite being technically possible, splitting water to generate hydrogen is practically unfeasible, mainly because of the lack of sustainable and efficient earth-abundant catalysts for the hydrogen-evolution reaction (HER). Herein, we report a durable and highly active electrochemical HER catalyst based on defect-rich TiO2 nanoparticles loaded on Co nanoparticles@N-doped carbon nanotubes (D-TiO2/Co@NCT) synthesized by electrostatic spinning and a subsequent calcining process. The ultrasmall TiO2 nanoparticles are 1.5–2 nm in size and have a defect-rich structure of oxygen vacancies. D-TiO2/Co@NCT exhibits excellent HER catalytic activity in an acidic electrolyte (0.5 M H2SO4), with a low onset potential of −57.5 mV (1 mA·cm–2), a small Tafel slope of 73.5 mV·dec–1, and extraordinary long-term durability. X-ray photoelectron spectroscopy, electron paramagnetic resonance spectroscopy, and theoretical calculations confirm that the Ti3+ defect-rich structure can effectively regulate the catalytic activity for electrochemical water splitting.
Tsinghua University Press
Jiayuan Yu,Weijia Zhou,Tanli Xiong,Aili Wang,Shaowei Chen,Benli Chu, Enhanced electrocatalytic activity of Co@N-doped carbon nanotubes by ultrasmall defect-rich TiO2 nanoparticles for hydrogen evolution reaction. NanoRes.2017, 10(8): 2599–2609