过电位
电合成
电催化剂
催化作用
过氧化氢
电解质
化学
铂金
可逆氢电极
纳米晶
化学工程
无机化学
材料科学
纳米技术
电极
电化学
物理化学
有机化学
参比电极
工程类
作者
Hui Li,Peng Wen,Dominique S. Itanze,Zachary D. Hood,Sushovit Adhikari,Chang Lü,Xiao Ma,Chaochao Dun,Lin Jiang,David Carroll,Yejun Qiu,Scott M. Geyer
标识
DOI:10.1038/s41467-020-17584-9
摘要
Abstract Despite progress in small scale electrocatalytic production of hydrogen peroxide (H 2 O 2 ) using a rotating ring-disk electrode, further work is needed to develop a non-toxic, selective, and stable O 2 -to-H 2 O 2 electrocatalyst for realizing continuous on-site production of neutral hydrogen peroxide. We report ultrasmall and monodisperse colloidal PtP 2 nanocrystals that achieve H 2 O 2 production at near zero-overpotential with near unity H 2 O 2 selectivity at 0.27 V vs. RHE. Density functional theory calculations indicate that P promotes hydrogenation of OOH* to H 2 O 2 by weakening the Pt-OOH* bond and suppressing the dissociative OOH* to O* pathway. Atomic layer deposition of Al 2 O 3 prevents NC aggregation and enables application in a polymer electrolyte membrane fuel cell (PEMFC) with a maximum r(H 2 O 2 ) of 2.26 mmol h −1 cm −2 and a current efficiency of 78.8% even at a high current density of 150 mA cm −2 . Catalyst stability enables an accumulated neutral H 2 O 2 concentration in 600 mL of 3.0 wt% (pH = 6.6).
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