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 journalArticle

12 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
JournalSmall
DOIs
Publication statusAccepted/In press - 2018 Jan 1

Fingerprint

Fibroins
Silk
Electrocatalysts
Scaffolds
Hydrogen
Carbon
Charge transfer
Nanosheets
Cyclic voltammetry
Catalyst activity
Catalytic Domain
Durability
Current density
Catalysts
Water

Keywords

  • Cobalt phosphide
  • Electrocatalysts
  • Hydrogen evolution
  • Silk fibroin
  • Stability

ASJC Scopus subject areas

  • Biotechnology
  • Biomaterials
  • Engineering (miscellaneous)

Cite this

3D Architectures of CoxP Using Silk Fibroin Scaffolds : An Active and Stable Electrocatalyst for Hydrogen Generation in Acidic and Alkaline Media. / Kim, Taek Seung; Song, Hee Jo; Kim, Jae Chan; Ju, Bobae; Kim, Dong-Wan.

In: Small, 01.01.2018.

Research output: Contribution to journalArticle

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