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

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Taek-Seung KimDong-Wan Kim

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 Cox P/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 Cox P/carbon can facilitate a lower overpotential, Tafel slope, charge transfer resistance, and a higher electrochemically active surface than carbon-free and silk-free Cox P. 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 Cox P/carbon.

References

Nov 20, 2001·Nature·M S Dresselhaus, I L Thomas
Oct 27, 2010·Chemical Reviews·Susan E HabasDavid S Ginley
Apr 23, 2011·Journal of the American Chemical Society·Yanguang LiHongjie Dai
Apr 18, 2015·Chemical Society Reviews·Xiaoxin Zou, Yu Zhang
Dec 15, 2016·Nano Letters·Hanfeng LiangHusam N Alshareef

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