Nanomaterials (Jun 2021)

Assembly of Copolymer and Metal−Organic Framework HKUST-1 to Form Cu<sub>2−x</sub>S/CNFs Intertwining Network for Efficient Electrocatalytic Hydrogen Evolution

  • Yuanjuan Bai,
  • Yanran Li,
  • Gonggang Liu,
  • Jinbo Hu

DOI
https://doi.org/10.3390/nano11061505
Journal volume & issue
Vol. 11, no. 6
p. 1505

Abstract

Read online

The construction of complex intertwined networks that provide fast transport pathways for ions/electrons is very important for electrochemical systems such as water splitting, but a challenge. Herein, a three dimensional (3-D) intertwined network of Cu2−xS/CNFs (x = 0 or 0.04) has been synthesized through the morphology-preserved thermal transformation of the intertwined PEG-b-P4VP/ HKUST-1 hybrid networks. The strong interaction between PEG chains and Cu2+ is the key to the successful assembly of PEG-b-P4VP nanofibers and HKUST-1, which inhibits the HKUST-1 to form individual crystalline particles. The obtained Cu2−xS/CNFs composites possess several merits, such as highly exposed active sites, high-speed electronic transmission pathways, open pore structure, etc. Therefore, the 3-D intertwined hierarchical network of Cu2−xS/CNFs displays an excellent electrocatalytic activity for HER, with a low overpotential (η) of 276 mV to reach current densities of 10 mA cm−2, and a smaller Tafel slope of 59 mV dec−1 in alkaline solution.

Keywords