One-step synthesis of cobalt-doped MoS2 nanosheets as bifunctional electrocatalysts for overall water splitting under both acidic and alkaline conditions

Author(s): Qizhong Xiong ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Xian Zhang ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Haojie Wang ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Guoqiang Liu ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Guozhong Wang ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Haimin Zhang ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Huijun Zhao ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵

Publication date (Electronic): 2018

Journal: Chemical Communications

Publisher: Royal Society of Chemistry (RSC)

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Abstract

Cobalt covalent doping in MoS ₂ effectively regulates its electronic structure to decrease the hydrogen adsorption free energy for high HER and simultaneously contributes additional catalytic active sites for the OER.

Abstract

Cobalt-doped MoS ₂ nanosheets were prepared via a facile hydrothermal method, exhibiting bifunctional activities of hydrogen and oxygen evolution reactions in both acidic and alkaline media. Cobalt doping not only improves the conductivity, decreasing the hydrogen adsorption free energy of MoS ₂ for HER, but also contributes catalytic active sites for OER.

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Alternative energy technologies.

M. S. Dresselhaus, I. Thomas (2001)

Fossil fuels currently supply most of the world's energy needs, and however unacceptable their long-term consequences, the supplies are likely to remain adequate for the next few generations. Scientists and policy makers must make use of this period of grace to assess alternative sources of energy and determine what is scientifically possible, environmentally acceptable and technologically promising.

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Bifunctional non-noble metal oxide nanoparticle electrocatalysts through lithium-induced conversion for overall water splitting

Haotian Wang, Hyun-Wook Lee, Yong-Jian Deng … (2015)

Developing earth-abundant, active and stable electrocatalysts which operate in the same electrolyte for water splitting, including oxygen evolution reaction and hydrogen evolution reaction, is important for many renewable energy conversion processes. Here we demonstrate the improvement of catalytic activity when transition metal oxide (iron, cobalt, nickel oxides and their mixed oxides) nanoparticles (∼20 nm) are electrochemically transformed into ultra-small diameter (2–5 nm) nanoparticles through lithium-induced conversion reactions. Different from most traditional chemical syntheses, this method maintains excellent electrical interconnection among nanoparticles and results in large surface areas and many catalytically active sites. We demonstrate that lithium-induced ultra-small NiFeO x nanoparticles are active bifunctional catalysts exhibiting high activity and stability for overall water splitting in base. We achieve 10 mA cm−2 water-splitting current at only 1.51 V for over 200 h without degradation in a two-electrode configuration and 1 M KOH, better than the combination of iridium and platinum as benchmark catalysts.