钴
氧还原反应
氧还原
碳纳米管
对偶(语法数字)
氮气
兴奋剂
碳纤维
材料科学
氧气
纳米管
双重角色
还原(数学)
纳米技术
化学
无机化学
电化学
电极
光电子学
组合化学
复合数
有机化学
物理化学
艺术
几何学
文学类
复合材料
数学
作者
Rongyue Wang,Jiawei Zhong,Dexuan Li,Jiazhou Meng,Weiming Huang,Xuehu Ma,Wei Guo,Feng Tian,Chuanhao Li
标识
DOI:10.1016/j.cej.2024.150894
摘要
Manipulating the selective adsorption of oxygen-containing species is crucial for tailoring the electrocatalyst to select dual-electron pathway in the oxygen reduction reaction (2e- ORR). Herein, dual-coordination electrocatalyst structure (Co-NCNT/MXene) is proposed based on the modulation of oxygenated species adsorption by coordination microenvironment at the interface of metal nanocatalysts. The Co-NCNT/MXene achieves excellent H2O2 selectivity (95.25 %), yield (162 mg L-1h−1) and Faraday efficiency (94.81 %) for ORR, surpassing the most Co-based-electrocatalysts. In-situ EPR techniques reveal the selective *OOH desorption dynamic process on Co-NCNT/MXene. Density functional theory calculations confirm that asymmetric coordination of Co nanoparticles by oxygen-terminated Ti3C2-MXene and NCNT modulates the delocalized state of Co extranuclear electrons, resulting in a reduction of the d-band center of Co, thus turning the adsorption energy of *OOH within the Co-NCNT/MXene interface towards a path more conducive to H2O2 electrosynthesis. In-situ H2O2 generated in the ORR is applied to achieve excellent degradation of organic pollutants.
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