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Superior Dye Adsorbent towards Hydrogen Evolution Reaction Combining Active Sites and Phase-Engineering of (1T/2H) MoS2/α-MoO3 Hybrid Heterostructured Nanoflowers

Abstract

Here, we demonstrate the successful synthesis of (1T/2H) MoS2/α-MoO3 heterostructured nanoflowers at a low temperature of 200 °C by a one-step hydrothermal method. By tuning the reaction time with the influence of thiourea and hydrazine hydrate, we established a complete phase-engineered MoS2 with 1T and 2H phases on the surface of α-MoO3. Active sites associated with the phase-engineered (1T/2H) MoS2/α-MoO3 hybrid nanoflowers exhibit bi-functionality including as a superior dye adsorbent and an electrocatalyst towards the hydrogen evolution reaction. The 2H-rich (1T/2H) MoS2/α-MoO3 hybrid heterostructured nanoflowers prepared at 16 h attained a high surface area of 37.97 m2 g−1, and 97 % of the RhB dye with an initial concentration of 47.9 mg L−1 was removed within 10 min through the adsorption process, which is the highest known removal efficiency reported in the literature. As a hydrogen evolution reaction (HER) electrocatalyst in acidic solution, the 1T-rich (1T/2H) MoS2/α-MoO3 hybrid heterostructured nanoflowers prepared at 12 h exhibited a highly efficient catalytic activity by achieving a low overpotential of 232 mV at a current density of 10 mA cm−2, which is comparable to previously reported HER catalysts based on MoS2. Moreover, this sample reached a low Tafel slope of 81 mV dec−1 and was stable when operated for more than 1000 cycles.

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Publication details

The article was received on 17 Mar 2018, accepted on 20 Jun 2018 and first published on 26 Jun 2018


Article type: Paper
DOI: 10.1039/C8TA02496K
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Superior Dye Adsorbent towards Hydrogen Evolution Reaction Combining Active Sites and Phase-Engineering of (1T/2H) MoS2/α-MoO3 Hybrid Heterostructured Nanoflowers

    A. Manikandan, P. Robert Ilango, C. Chen, C. Wang, Y. Shih, L. Lee, Z. M. Wang, H. Ko and Y. Chueh, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA02496K

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