3D Architectures of CoxP Using Silk Fibroin Scaffolds: An Active and Stable Electrocatalyst for Hydrogen Generation in Acidic and Alkaline Media
- Authors
- Kim, Taek-Seung; Song, Hee Jo; Kim, Jae-Chan; Ju, Bobae; Kim, Dong-Wan
- Issue Date
- 21-Jun-2018
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- cobalt phosphide; electrocatalysts; hydrogen evolution; silk fibroin; stability
- Citation
- SMALL, v.14, no.25
- Indexed
- SCIE
SCOPUS
- Journal Title
- SMALL
- Volume
- 14
- Number
- 25
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/74903
- DOI
- 10.1002/smll.201801284
- ISSN
- 1613-6810
- 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.
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Collections - College of Engineering > School of Civil, Environmental and Architectural Engineering > 1. Journal Articles
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