碳纳米管
电催化剂
电化学
选择性
催化作用
材料科学
吸附
化学工程
可逆氢电极
氧气
煅烧
甲酰胺
无机化学
电极
化学
纳米技术
工作电极
物理化学
有机化学
工程类
作者
Shuming Xu,Ruihu Lu,Kang Sun,Jui-Hsiang Tang,Yaping Cen,Liang Luo,Ziyun Wang,Shubo Tian,Xiaoming Sun
标识
DOI:10.1002/advs.202201421
摘要
Abstract Electrochemical 2‐electron oxygen reduction reaction (ORR) is a promising route for renewable and on‐site H 2 O 2 production. Oxygen‐rich carbon nanotubes have been demonstrated their high selectivity (≈80%), yet tailoring the composition and structure of carbon nanotubes to further enhance the selectivity and widen working voltage range remains a challenge. Herein, combining formamide condensation coating and mild temperature calcination, a nitrogen and oxygen comodified carbon nanotubes (N,O‐CNTs) electrocatalyst is synthesized, which shows excellent selective (>95%) H 2 O 2 selectivity in a wide voltage range (from 0 to 0.65 V versus reversible hydrogen electrode). It is significantly superior to the corresponding selectivity values of CNTs (≈50% in 0–0.65 V vs RHE) and O‐CNTs (≈80% in 0.3–0.65 V vs RHE). Density functional theory calculations revealed that the C neighbouring to N is the active site. Introducing O‐related species can strengthen the adsorption of intermediates *OOH, while N‐doping can weaken the adsorption of in situ generated *O and optimize the *OOH adsorption energy, thus improving the 2‐electron pathway. With optimized N,O‐CNTs catalysts, a Janus electrode is designed by adjusting the asymmetric wettability to achieve H 2 O 2 productivity of 264.8 mol kg cat –1 h –1 .
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