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. 2018 Sep 20;9:3827. doi: 10.1038/s41467-018-06100-9

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© The Author(s) 2018

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Fig. 2 — Facilitated reduction of Cu by Pd on the opposing end of a carbon nanotube. a TPR profiles of CuO/CNT and Pd/CNT/CuO catalysts performed with a flowing 5% H₂/Ar stream at a ramp rate of 5 °C/min. b Cu K edge XANES of Cu foil (black), Cu₂O (red), and CuO. (blue). c XANES of fresh Pd/CNT/CuO (black) and after reduction in 3% H₂ in He at 100 (red), 150 (blue), 200 (green), and 300 ^oC (pink). d XANES of fresh CuO physically mixed with CNTs (black) and after reduction in 3% H₂ in He at 150 (red) and 200 ^oC (blue)