TY - JOUR
T1 - Engineering of Molybdenum Sulfide Nanobunches on MWCNTs
T2 - Modulation of Active Sites and Electronic Conductivity via Controllable Solvothermal Deposition
AU - Ali, Aya
AU - Basuni, Mustafa
AU - Shams-Eldin, Reham
AU - Pilz, Lena
AU - Hashem, Tawheed
AU - Heinle, Marita
AU - Nefedov, Alexei
AU - Amin, Muhamed
AU - Tsotsalas, Manuel
AU - Drazic, Goran
AU - Hassanien, Abdou
AU - Alkordi, Mohamed H.
N1 - Funding Information:
We acknowledge the financial support from the Academy for Scientific Research and Technology (ASRT-Egypt), and the Alexander von Humboldt foundation (Germany). A.H would like to acknowledge the financial support by the Slovenian Research Agency (ARRS) under Program No. P1-0099. We thank Mohamed H. Hassan for helping with the artwork.
Publisher Copyright:
© 2023 American Chemical Society.
PY - 2023/3/10
Y1 - 2023/3/10
N2 - Amorphous, mixed-valency, molybdenum sulfide (MoSx) with a proposed formula, [Mo(IV)4Mo(V)2(S22-)3(S2-)5](SO4)5, was grown through a one-pot, solvothermal synthesis on multi-walled carbon nanotubes (MWCNTs) in a gram-scale setup. Optimizing the loading of the active catalyst relative to the conductive support resulted in optimized catalytic performance in hydrogen evolution reaction, reaching down to one of the lowest reported overpotentials, η10 = 140 mV and η100 = 198 mV with a Tafel slope of 62 mV/dec, for the 6.5 wt % of MoSx@MWCNTs. Engineering this amorphous MoSx catalyst was made possible through control of the oxidation state of Mo to avoid the fully reduced MoS2 phases. We also demonstrate that engineering defects in the MoSx catalyst does not require sophisticated techniques (e.g., UHV deposition, ion beam sputtering, and pulsed laser ablation) but can rather be induced simply through controlling the reductive synthesis conditions.
AB - Amorphous, mixed-valency, molybdenum sulfide (MoSx) with a proposed formula, [Mo(IV)4Mo(V)2(S22-)3(S2-)5](SO4)5, was grown through a one-pot, solvothermal synthesis on multi-walled carbon nanotubes (MWCNTs) in a gram-scale setup. Optimizing the loading of the active catalyst relative to the conductive support resulted in optimized catalytic performance in hydrogen evolution reaction, reaching down to one of the lowest reported overpotentials, η10 = 140 mV and η100 = 198 mV with a Tafel slope of 62 mV/dec, for the 6.5 wt % of MoSx@MWCNTs. Engineering this amorphous MoSx catalyst was made possible through control of the oxidation state of Mo to avoid the fully reduced MoS2 phases. We also demonstrate that engineering defects in the MoSx catalyst does not require sophisticated techniques (e.g., UHV deposition, ion beam sputtering, and pulsed laser ablation) but can rather be induced simply through controlling the reductive synthesis conditions.
KW - amorphous MoS
KW - mixed-valency molybdenum catalyst
KW - molybdenum sulfide deposition on MWCNTs
KW - molybdenum sulfide HER
KW - supported nanocatalyst
UR - http://www.scopus.com/inward/record.url?scp=85148671607&partnerID=8YFLogxK
U2 - 10.1021/acsanm.2c05311
DO - 10.1021/acsanm.2c05311
M3 - Article
AN - SCOPUS:85148671607
SN - 2574-0970
VL - 6
SP - 3627
EP - 3636
JO - ACS Applied Nano Materials
JF - ACS Applied Nano Materials
IS - 5
ER -