Fig. 1: CO2RR performance and mechanistic insight of AgNP+Id hybrid.
From: Electro-activated indigos intensify ampere-level CO2 reduction to CO on silver catalysts
a Reaction mechanism of redox-active Id for CO2 capture. b CV of Id under N2 and CO2 atmospheres. The experiments were conducted by dissolving 2.5 mM Id in dimethyl sulfoxide (DMSO) with 0.1 M tetrabutylammonium hexafluorophosphate (TBAPF6) at a scan rate of −20 mV s–1. Ferrocene/ferrocenium (Fc0/+) was used as an internal reference. Potentials are non-iR corrected. c DFT-optimized structure of Id-2CO22– adduct showing the bent CO2 configuration at the redox-active oxygen center. The corresponding bond angles and lengths are listed next to the structure. The black, red, blue, and white spheres represent C, O, N, and H atoms, respectively. d, e Comparison of CO FE as a function of jtotal (d), and jCO as a function of potential (e) for AgNP and AgNP+Id. Potentials have been 100% iR corrected. The flow cell was operated with 1 M KOH (pH = 14.0 ± 0.2). Data are presented as mean ± s.d. Error bars represent s.d. from measurements of three independent electrodes. f Adsorption configuration of the *CO2– intermediate at the Ag/Id interface and comparison of *CO2– adsorption energies for AgNP and AgNP+Id. The black, red, blue, white, and purple spheres represent C, O, N, H, and Ag atoms, respectively. g Potential-dependent ATR-SEIRAS contour map for AgNP and AgNP/Id. ΔR/R0 = (R − R0)/R0, where R and R0 are spectra collected at the sample potential and the open circuit potential, respectively. Source data are provided as a Source Data file.
