Functionalized polyvinyl alcohol aerogel for efficient and selective removal of arsenite from aqueous matrices

High-loading As single-atom catalysts harvested from wastewater towards efficient and sustainable oxygen reduction

“…3a). Remarkably, the valence state of As-DC1-1050 is slightly lower than that of As-RC1-1050, which may stem from the abundance of defects in As-DC1-1050 35,36 (Fig. 2i).…”

“…Compared to no bias, As-DC1-1050 works at 1.1 V with a positive shift in the binding energy of As, which is due to the adsorption of O 2 in oxygen-saturated 0.1 M HClO 4 at the As active site. 47 The gradual formation of oxygen-containing intermediates (such as O* and OH*) at the As site contributes to a gradual increase in the binding energy of As when the applied voltage ranges from 0.9 to 0.5 V. 3,32,36 This demonstrates that the high activity of As-DC1-1050 arises from the incorporation of single-atom As. In addition, As-DC1-1050-290, which was operated in a fuel cell after 290 h, was also subjected to XPS in situ strategies to analyze its oxygen reduction recession mechanism.…”

“…S9b, ESI †). 24,36 Fourier-transform infrared (FT-IR) spectroscopy further confirms that oxygen-containing functional groups (C-OH and C-O) are prone to arise on the surface of As-DC1-1050, and this problem has always limited the long-term stability of Fe-NC SACs (Fig. S10, ESI †).…”