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

Rongan Shen,Wenxing Chen,Qing Peng,Siqi Lu,Lirong Zheng,Xing Cao,Yu Wang,Wei Zhu,Juntao Zhang,Zhongbin Zhuang,Chen Chen,Dingsheng Wang,Yadong Li

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 .