3D Architectures of CoxP Using Silk Fibroin Scaffolds: An Active and Stable Electrocatalyst for Hydrogen Generation in Acidic and Alkaline Media

Taek Seung Kim, Hee Jo Song, Jae Chan Kim, Bobae Ju, Dong Wan Kim

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

Developing nonprecious, highly active, and stable catalysts is essential for efficient electrocatalytic hydrogen evolution reaction in water splitting. In this study, the facile synthesis of a 3D flower-like CoxP/carbon architecture is proposed composed of an assembly of nanosheets interconnected by silk fibroin that acts as 3D scaffolds and a carbon source. This unique 3D architecture coupled with a carbon matrix enhances catalytic activity by exposing more active sites and increasing charge transport. The flower-like CoxP/carbon can facilitate a lower overpotential, Tafel slope, charge transfer resistance, and a higher electrochemically active surface than carbon-free and silk-free CoxP. The nanostructured architecture exhibits excellent catalytic performance with low overpotentials of 109 and 121 mV at 10 mA cm−2 and Tafel slopes of 55 and 62 mV dec−1 in acidic and alkaline media, respectively. Furthermore, it minimally degrades the overpotential and current density after long-term stability tests 10 000 cyclic voltammetry cycles and a chronoamperometric test over 40 h, respectively, in acidic media, which confirms the high durability and stability of the flower-like CoxP/carbon.

Original languageEnglish
Article number1801284
JournalSmall
Volume14
Issue number25
DOIs
Publication statusPublished - 2018 Jun 21

Keywords

  • cobalt phosphide
  • electrocatalysts
  • hydrogen evolution
  • silk fibroin
  • stability

ASJC Scopus subject areas

  • Biotechnology
  • Biomaterials
  • Chemistry(all)
  • Materials Science(all)

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