TY - JOUR
T1 - Co-Doped MoSe2 Nanoflowers as Efficient Catalysts for Electrochemical Hydrogen Evolution Reaction (HER) in Acidic and Alkaline Media
AU - Zimron, Oded
AU - Zilberman, Tamar
AU - Kadam, Sunil R.
AU - Ghosh, Sirshendu
AU - Kolatker, Shay Lee
AU - Neyman, Alevtina
AU - Bar-Ziv, Ronen
AU - Bar-Sadan, Maya
N1 - Funding Information:
S. K. and S. G. thank the financial support of the Kreitman Post‐Doctoral fellowship at the BGU. This center of excellence was supported by The Israel Science foundation (grant No. 1212/21).
Publisher Copyright:
© 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2020/5/1
Y1 - 2020/5/1
N2 - Transition metal dichalcogenides (TMDCs) based materials are considered as highly active alternatives to the precious Pt-based catalysts for the hydrogen evolution reaction (HER). In particular, MoSe2emerges as a promising catalyst due to its abundance and electrochemical stability, but further modifications are still required to enhance its performance, specifically in alkaline conditions. Here, we developed a method to obtain MoSe2with two cobalt doping patterns: homogeneously doped and edge doped nanoflowers, with abundant edge sites and extended surface area. The results show that low concentration of doping enhances the catalytic activity toward HER. Incorporation of cobalt as a substituent dopant within the layered structure of MoSe2appears to have two major contributions: it changes the chemical environment providing more active sites with favored hydrogen adsorption properties, and improves the charge transfer resistance and thus facilitates the HER kinetics. Moreover, the homogeneous and edge-doped nanoflowers show different pH-dependence of HER activity. Edge-doped samples exhibit significantly improved performance in acidic medium, while the overpotential increases in alkaline environment upon doping. A mechanistic explanation of the observed effect is proposed. This work opens up an additional path for improving the catalytic activity of TMDCs in acidic or alkaline medium using a simple and facile method with only small quantities of dopants.
AB - Transition metal dichalcogenides (TMDCs) based materials are considered as highly active alternatives to the precious Pt-based catalysts for the hydrogen evolution reaction (HER). In particular, MoSe2emerges as a promising catalyst due to its abundance and electrochemical stability, but further modifications are still required to enhance its performance, specifically in alkaline conditions. Here, we developed a method to obtain MoSe2with two cobalt doping patterns: homogeneously doped and edge doped nanoflowers, with abundant edge sites and extended surface area. The results show that low concentration of doping enhances the catalytic activity toward HER. Incorporation of cobalt as a substituent dopant within the layered structure of MoSe2appears to have two major contributions: it changes the chemical environment providing more active sites with favored hydrogen adsorption properties, and improves the charge transfer resistance and thus facilitates the HER kinetics. Moreover, the homogeneous and edge-doped nanoflowers show different pH-dependence of HER activity. Edge-doped samples exhibit significantly improved performance in acidic medium, while the overpotential increases in alkaline environment upon doping. A mechanistic explanation of the observed effect is proposed. This work opens up an additional path for improving the catalytic activity of TMDCs in acidic or alkaline medium using a simple and facile method with only small quantities of dopants.
KW - 2D Layered Materials
KW - Colloidal Synthesis
KW - Heterogenous Catalysis
KW - Substitutional Doping
UR - http://www.scopus.com/inward/record.url?scp=85078672212&partnerID=8YFLogxK
U2 - 10.1002/ijch.201900162
DO - 10.1002/ijch.201900162
M3 - Article
AN - SCOPUS:85078672212
VL - 60
SP - 624
EP - 629
JO - Israel Journal of Chemistry
JF - Israel Journal of Chemistry
SN - 0021-2148
IS - 5-6
ER -