Fig. 5: In situ DRIFTS for mechanistic analysis.
From: Rational synthesis of dual-atom catalysts for optimized thermochemical CO2 reduction
a–d Time-resolved in situ DRIFTS spectra acquired during sequential gas-exposure experiments at 500 oC for Cu-SAC (a), Ni-SAC (b), CuNi-DAC (c), and CuNi-NP (d). Each experiment consisted of CO2 adsorption (30 min), N2 purging (30 min), and subsequent injection of 10 % H2/Ar; spectra were recorded continuously during the H2 injection (2–30 min) to monitor the evolution of adsorbed reaction intermediates. e Intensity mapping of DRIFTS spectra for the 2200–1200 cm-1 region, comparing COOH* intermediate accumulation and CO adsorption band across the catalyst samples. f Isotopic TPSR-MS ion current (m/z) profiles of CuNi-DAC using three feeds, 12CO2-only, 12CO2/H2 (1:4), and 13CO2/H2 (1:4).
