Title

Carbon encapsulated MoS2 as an efficient electrocatalyst for the hydrogen evolution reaction

Document Type

Graduate Research

Publication Date

4-7-2016

Department

Chemistry

Abstract

To meet the constantly rising requirement of energy other than traditional fossil fuel and environment protection, it is a perfect time to development low cost, and efficient materials for clean energy production. Hydrogen generation by water splitting is one of the cleanest ways to produce cheaper energy. Hydrogen evolution reaction (HER) is one of the key steps in water splitting process. Ideally, the thermodynamic potential for (HER) should be at 0 V (vs. SHE). However, without an efficient catalyst, this reaction occurred at higher potential, called overpotential. A good HER catalyst is needed to lower the overpotential and hence to improve the energy efficiency of this process. Presently, platinum is the most effective and durable catalyst for HER, but its wide spread use is precluded due to its cost as well as limited availability. Therefore, it is essential to develop low-cost and earth-abundant materials to replace precious-platinum based catalysts. In this work, a facile and scalable one-pot method has been developed to synthesize carbon coated MoS2. The carbon coated MoS2 is advantageous as this increases the electrical/iconic conductivity of MoS2. The structural characterization of MoS2 and carbon coated MoS2 was performed using x-ray diffraction and scanning electron microscopy. Hydrogen evolution reaction was studied in potential range of 0 to -0.7 V and observed that carbon coated MoS2 provide lower overpotential compared to uncoated MoS2.

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