TY - JOUR
T1 - High performance, 3D-hierarchical CoS2/CoSe@C nanohybrid as an efficient electrocatalyst for hydrogen evolution reaction
AU - Karuppasamy, K.
AU - Bose, Ranjith
AU - Jothi, Vasanth Rajendiran
AU - Vikraman, Dhanasekaran
AU - Jeong, Yen Tae
AU - Arunkumar, Paulraj
AU - Velusamy, Dhinesh Babu
AU - Maiyalagan, T.
AU - Alfantazi, Akram
AU - Kim, Hyun Seok
N1 - Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2020/10/15
Y1 - 2020/10/15
N2 - Electrolysis, driven by renewables, is ideally a direct and clean route to generate the hydrogen. However, for the efficient H2 generation designing active, stable and low cost electrocatalyst system to replace expensive Pt is of paramount importance. Here, a hetero-structured system composed of CoS2 and CoSe nanostructures on carbon matrix (CoS2/CoSe@C) is proposed as an active electrocatalyst for hydrogen evolution reaction (HER) in acid medium. The composition of sulfur and selenium in the derived CoS2/CoSe@C electrocatalyst is analytically controlled for the enhanced HER performance. The prepared electrocatalyst offers the low overpotential of 164 mV at the current density of 10 mA cm−2 with a small Tafel slope of 42 mV dec−1 as a result of proper synergy between the active components CoS2 and CoSe. Moreover, the interconnected network in the carbon matrix of CoS2/CoSe@C provides better conductivity ensured by adequate contact area between the electrocatalyst and electrolyte. Besides the convincing electrochemical activity, catalyst demonstrates the good stability for at least 10 h. This work highlights importance of composite materials for HER via synchronizing catalytically active materials (Ni, Co, Mo) and highly conductive supports (CNT, C, rGO).
AB - Electrolysis, driven by renewables, is ideally a direct and clean route to generate the hydrogen. However, for the efficient H2 generation designing active, stable and low cost electrocatalyst system to replace expensive Pt is of paramount importance. Here, a hetero-structured system composed of CoS2 and CoSe nanostructures on carbon matrix (CoS2/CoSe@C) is proposed as an active electrocatalyst for hydrogen evolution reaction (HER) in acid medium. The composition of sulfur and selenium in the derived CoS2/CoSe@C electrocatalyst is analytically controlled for the enhanced HER performance. The prepared electrocatalyst offers the low overpotential of 164 mV at the current density of 10 mA cm−2 with a small Tafel slope of 42 mV dec−1 as a result of proper synergy between the active components CoS2 and CoSe. Moreover, the interconnected network in the carbon matrix of CoS2/CoSe@C provides better conductivity ensured by adequate contact area between the electrocatalyst and electrolyte. Besides the convincing electrochemical activity, catalyst demonstrates the good stability for at least 10 h. This work highlights importance of composite materials for HER via synchronizing catalytically active materials (Ni, Co, Mo) and highly conductive supports (CNT, C, rGO).
KW - Cobalt chalcogenides
KW - Electrocatalysis
KW - Hydrogen evolution reaction
UR - http://www.scopus.com/inward/record.url?scp=85085300492&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2020.155537
DO - 10.1016/j.jallcom.2020.155537
M3 - Article
AN - SCOPUS:85085300492
SN - 0925-8388
VL - 838
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
M1 - 155537
ER -