02244nas a2200277   4500008004100000022001400041245013000055210006900185260000800254300001200262490000700274520132700281653001801608653000701626653002101633653001301654100002201667700001501689700002701704700002201731700002101753700002101774700001801795700002501813856012801838       2022                        eng d  a0935-964800aStructure-tailored surface oxide on Cu-Ga intermetallics enhances CO2 reduction selectivity to methanol at ultralow potential0 aStructuretailored surface oxide on CuGa intermetallics enhances   cMAY  a21094260 v343 a<p>
	Electrochemical CO2 reduction reaction (eCO(2)RR) is performed on two intermetallic compounds formed by copper and gallium metals (CuGa2 and Cu9Ga4). Among them, CuGa2 selectively converts CO2 to methanol with remarkable Faradaic efficiency of 77.26% at an extremely low potential of -0.3 V vs RHE. The high performance of CuGa2 compared to Cu9Ga4 is driven by its unique 2D structure, which retains surface and subsurface oxide species (Ga2O3) even in the reduction atmosphere. The Ga2O3 species is mapped by X-ray photoelectron spectroscopy (XPS) and X-ray absorption fine structure (XAFS) techniques and electrochemical measurements. The eCO(2)RR selectivity to methanol are decreased at higher potential due to the lattice expansion caused by the reduction of the Ga2O3, which is probed by in situ XAFS, quasi in situ powder X-ray diffraction, and ex situ XPS measurements. The mechanism of the formation of methanol is visualized by in situ infrared (IR) spectroscopy and the source of the carbon of methanol at the molecular level is confirmed from the isotope-labeling experiments in presence of (CO2)-C-13. Finally, to minimize the mass transport limitations and improve the overall eCO(2)RR performance, a poly(tetrafluoroethylene)-based gas diffusion electrode is used in the flow cell configuration.</p>
10a(2) reduction10aCO10aElectrochemistry10aMethanol1 aBagchi, Debabrata1 aRaj, Jithu1 aSingh, Ashutosh, Kumar1 aCherevotan, Arjun1 aRoy, Soumyabrata1 aManoj, Kaja, Sai1 aVinod, C., P.1 aPeter, Sebastian, C.  uhttps://library.ncl.res.in/content/structure-tailored-surface-oxide-cu-ga-intermetallics-enhances-co2-reduction-selectivity