High-Concentration Single Atomic Pt Sites on Hollow CuSx for Selective O2 Reduction to H2O2 in Acid Solution

Summary The electrochemical direct synthesis of hydrogen peroxide (H 2 O 2 ) is significant but still challenging because of the lack of highly selective and active catalysts. Here, we report the synthesis of hollow nanospheres constructed by atomically dispersing platinum in amorphous CuS x support (h-Pt 1 -CuS x ) with a high concentration of single atomic Pt sites (24.8 at%), and this catalyst can consistently reduce O 2 into H 2 O 2 with selectivity of 92%–96% over a wide potential range of 0.05–0.7 V versus RHE in HClO 4 electrolyte. Scanning transmission electron microscopy and X-ray absorption fine structure spectroscopy confirmed the atomically isolated form of Pt with a low valance of +0.75. An electrochemical device that can synthesize H 2 O 2 directly from H 2 and O 2 is fabricated with H 2 O 2 productivity as high as 546 ± 30 mol kg cat − 1 h −1 . The well-defined and high-concentration single atomic Pt sites result in ultrahigh productivity of H 2 O 2 .