Self-generated carbon nanotubes for protecting active sites on bifunctional Co/CoOx schottky junctions to promote oxygen reduction/evolution reactions via efficient valence transition.

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ID: 55914
2019
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Abstract
Protecting active species from aggregation and corrosion may be feasible to obtain stable catalytic activities for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Herein, bamboo-shaped N-doped carbon nanotubes (hollow BS-NCNTs as shells) are self-generated to in situ wrap the Co/CoO schottky junctions (cores) to obtain the Co/CoO@BS-NCNTs as bifunctional ORR/OER catalysts by using the Co-chelated melamine precursor. For ORR, Co/CoO@BS-NCNTs (700 °C) exhibits more positive peak (0.822 V vs. RHE) and half-wave (0.842 V vs. RHE) potential than those of commercial Pt/C (10 wt%). Superior ORR activity is mainly attributed to the enriched coordination-unsaturated Co (tetrahedral Co) in the CoO wrapped in the tubular structure of BS-NCNTs featuring high electrical conductivity and active N species. Moreover, the π-π bonds of CNTs are activated by N substitution, which provides a stunning electron capture and transmission capability for enhancing ORR activity. For OER, Co/CoO@BS-NCNTs (700 °C) obtains a smaller potential (1.590 V vs. RHE) than that of RuO/C at 10 mA cm. The outstanding OER activity and durability of Co/CoOx@BS-NCNTs (700 °C) originates from strong interactions between C-skeleton and Co species, and efficient Co/Co (CoOOH as active sites) transition protected by the externally-grown CNTs. Furthermore, abundant oxygen vacancies on CoO surface can facilitate the adsorption of OH/or OER-related intermediates to improve OER activity. Therefore, this study provides a promising strategy to develop NCNTs-wrapped Co species with high catalytic activity and stability for energy conversion.
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zhang2019selfgeneratedjournal Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Zhang, Peng;Cai, Zhuang;You, Shijie;Wang, Fangyu;Dai, Ying;Zhang, Chunyue;Zhang, Yanhong;Ren, Nanqi;Zou, Jinlong;
Journal Journal of colloid and interface science
Year 2019
DOI
S0021-9797(19)31098-7
URL
Keywords
oxygen reduction reaction oxygen evolution reaction co/coo(x) schottky junctions in situ self-generation tubular structure

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