Magnetic and electrocatalytic properties of transition metal doped MoS2 nanocrystals

Martinez, L. M.; Delgado, J. A.; Saiz, C. L.; Cosio, A.; Wu, Y.; Villagrán, D.; Gandha, K.; Karthik, C.; Nlebedim, I. C.; Singamaneni, S. R.

doi:10.1063/1.5043208

Title: Magnetic and electrocatalytic properties of transition metal doped MoS₂ nanocrystals

Journal Article · Wed Oct 17 00:00:00 EDT 2018 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.5043208· OSTI ID:1481874

Martinez, L. M. ^[1]; Delgado, J. A. ^[1]; Saiz, C. L. ^[1]; Cosio, A. ^[1]; Wu, Y. ^[1]; Villagrán, D. ^[1]; Gandha, K. ^[2];

^[3]; Nlebedim, I. C. ^[2]; Singamaneni, S. R. ^[1]

The Univ. of Texas at El Paso, El Paso, TX (United States)
Ames Lab., Ames, IA (United States)
Boise State Univ., Boise, ID (United States)

In this paper, the magnetic and electrocatalytic properties of hydrothermally grown transition metal doped (10% of Co, Ni, Fe, and Mn) 2H-MoS₂ nanocrystals (NCs) with a particle size 25–30 nm are reported. The pristine 2H-MoS₂ NCs showed a mixture of canted anti-ferromagnetic and ferromagnetic behavior. While Co, Ni, and Fe doped MoS₂ NCs revealed room temperature ferromagnetism, Mn doped MoS₂ NCs showed room temperature paramagnetism, predominantly. The ground state of all the materials is found to be canted-antiferromagnetic phase. To study electrocatalytic performance for hydrogen evolution reaction, polarization curves were measured for undoped and the doped MoS₂ NCs. At the overpotential of η = –300 mV, the current densities, listed from greatest to least, are FeMoS₂, CoMoS₂, MoS₂, NiMoS₂, and MnMoS2, and the order of catalytic activity found from Tafel slopes is CoMoS2 > MoS₂ > NiMoS₂ > FeMoS₂ > MnMoS₂. The increasing number of catalytically active sites in Co doped MoS₂ NCs might be responsible for their superior electrocatalytic activity. In conclusion, the present results show that the magnetic order-disorder behavior and catalytic activity can be modulated by choosing the suitable dopants in NCs of 2D materials.

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Research Organization:: Ames Lab., Ames, IA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-07CH11358; DMR-1205302

OSTI ID:: 1481874

Report Number(s):: IS-J-9761

Journal Information:: Journal of Applied Physics, Vol. 124, Issue 15; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 28 works

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