473513 Niobium Doped Molybdenum Disulfide Catalyst for CO2 Reduction Reaction
In this report, we have discovered a superior catalytic performance of Niobium (Nb) doped vertically aligned MoS2 (VA-MoS2) as an energy efficient and highly active catalyst for syngas production. Our results indicate that with only 5% Nb concentration at the edge atom structures, MoS2 exhibits more than two orders of magnitude higher activity than Ag nanoparticles and one order of magnitude higher than pristine MoS2 at low overpotentials (-0.2 V vs RHE).6 Additionally, the product characterization results reveal that this promoted catalyst is selective for syngas (CO and H2) formation at the potential range of -0.164 V to -0.764 V vs RHE. The effect of doping on the structure of pristine MoS2 was studied by synthesis and testing different concentrations of dopant for the CO2 reduction reaction. Different characterization methods such as scanning transmission electron microscopy (STEM), X-ray photoelectron spectroscopy (XPS), electron energy loss spectra (EELS), energy-dispersive X-ray spectroscopy (EDX) and in-situ differential electrochemical mass spectrometry (DEMS) were applied to fully elucidate the effect of dopant on the electronic structure of MoS2 and its catalytic activity and selectivity.
(1) Davis, S. J.; Caldeira, K.; Matthews, H. D. Future CO2 Emissions and Climate Change from Existing Energy Infrastructure. Science. 2010, 329, 1330–1333.
(2) Haszeldine, R. S. Carbon Capture and Storage: How Green Can Black Be? Science. 2009, 325, 1647–1652.
(3) Lastoskie, C. Caging Carbon Dioxide. Science. 2010, 330, 595–596.
(4) Behranginia, A.; Asadi, M.; Liu, C.; Yasaei, P.; Kumar, B.; Phillips, P.; Foroozan, T.; Waranius, J. C.; Kim, K.; Abiade, J.; et al. Highly Efficient Hydrogen Evolution Reaction Using Crystalline Layered Three-Dimensional Molybdenum Disulfides Grown on Graphene Film. Chem. Mater. 2016, 28, 549–555.
(5) Asadi, M.; Kumar, B.; Liu, C.; Phillips, P.; Yasaei, P.; Behranginia, A.; Zapol, P.; Klie, R. F.; Curtiss, L. A.; Salehi-Khojin, A. Cathode Based on Molybdenum Disulfide Nanoflakes for Lithium–Oxygen Batteries. ACS Nano, 2016, 10 (2), pp 2167–2175.
(6) Asadi, M.; Kumar, B.; Behranginia, A.; Rosen, B. a; Baskin, A.; Repnin, N.; Pisasale, D.; Phillips, P.; Zhu, W.; Haasch, R.; et al. Robust Carbon Dioxide Reduction on Molybdenum Disulphide Edges. Nat. Com. 2014, 5, 4470.
See more of this Group/Topical: Transport and Energy Processes