催化作用
化学
过氧化氢
镍
选择性
配体(生物化学)
席夫碱
碳纤维
热解
无机化学
吸附
物理化学
材料科学
结晶学
有机化学
复合材料
受体
复合数
生物化学
作者
Yulin Wang,Run Shi,Lu Shang,Geoffrey I. N. Waterhouse,Jiaqi Zhao,Qinghua Zhang,Lin Gu,Tierui Zhang
标识
DOI:10.1002/anie.202004841
摘要
Abstract Carbon‐supported Ni II single‐atom catalysts with a tetradentate Ni‐N 2 O 2 coordination formed by a Schiff base ligand‐mediated pyrolysis strategy are presented. A Ni II complex of the Schiff base ligand ( R , R )‐(−)‐N,N′‐bis(3,5‐di‐tert‐butylsalicylidene)‐1,2‐cyclohexanediamine was adsorbed onto a carbon black support, followed by pyrolysis of the modified carbon material at 300 °C in Ar. The Ni‐N 2 O 2 /C catalyst showed excellent performance for the electrocatalytic reduction of O 2 to H 2 O 2 through a two‐electron transfer process in alkaline conditions, with a H 2 O 2 selectivity of 96 %. At a current density of 70 mA cm −2 , a H 2 O 2 production rate of 5.9 mol g cat. −1 h −1 was achieved using a three‐phase flow cell, with good catalyst stability maintained over 8 h of testing. The Ni‐N 2 O 2 /C catalyst could electrocatalytically reduce O 2 in air to H 2 O 2 at a high current density, still affording a high H 2 O 2 selectivity (>90 %). A precise Ni‐N 2 O 2 coordination was key to the performance.
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