Engineering the structure of ZIF-derived catalysts by revealing the critical role of temperature for enhanced oxygen reduction reaction

2021 ◽  
Author(s):  
Zelin Wang ◽  
Xiaoxing Ke ◽  
Kailing Zhou ◽  
Xiaolong Xu ◽  
Yuhong Jin ◽  
...  
Keyword(s):  
Low Temperature ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Pyrolysis Temperature ◽  
Critical Role ◽  
Reduction Reaction

The critical role of the pyrolysis temperature for ZIF-derived ORR catalysts is revealed by in situ TEM in detail. A facile low temperature strategy is inspired to achieve an outstanding ORR performance.

Low-temperature and one-pot synthesis of sulfurized graphene nanosheets via in situ doping and their superior electrocatalytic activity for oxygen reduction reaction

2014 ◽  
Vol 2 (48) ◽  
pp. 20714-20722 ◽  
Author(s):  
Yi Chen ◽  
Jing Li ◽  
Tao Mei ◽  
Xian'gang Hu ◽  
Dengwu Liu ◽  
...  
Keyword(s):  
Low Temperature ◽  
Oxygen Reduction Reaction ◽  
Electronic Properties ◽  
Oxygen Reduction ◽  
Electrocatalytic Activity ◽  
Graphene Nanosheets ◽  
Reduction Reaction ◽  
Chemical Doping ◽  
One Pot

The chemical doping of foreign atoms and functional moieties is a significant strategy for tailoring the electronic properties and enhancing the catalytic ability of graphene.

Critical role of iron carbide nanodots on 3D graphene based nonprecious metal catalysts for enhancing oxygen reduction reaction

2018 ◽  
Vol 281 ◽  
pp. 502-509 ◽  
Author(s):  
Xiaoran Zhang ◽  
Dandan Lyu ◽  
Yaser Bahari Mollamahale ◽  
Feng Yu ◽  
Ming Qing ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Critical Role ◽  
Iron Carbide ◽  
Reduction Reaction ◽  
Metal Catalysts ◽  
3D Graphene ◽  
Nonprecious Metal

scholarly journals Direct Spectroscopy for Probing the Critical Role of Partial Covalency in Oxygen Reduction Reaction for Cobalt-Manganese Spinel Oxides

Nanomaterials ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 577 ◽  
Author(s):  
Xinghui Long ◽  
Pengfei Yu ◽  
Nian Zhang ◽  
Chun Li ◽  
Xuefei Feng ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Active Sites ◽  
Critical Role ◽  
Catalytic Efficiency ◽  
Systematic Investigation ◽  
Reduction Reaction ◽  
Highly Active ◽  
Spinel Oxides

Nanocrystalline multivalent metal spinels are considered as attractive non-precious oxygen electrocatalysts. Identifying their active sites and understanding their reaction mechanisms are essential to explore novel transition metal (TM) oxides catalysts and further promote their catalytic efficiency. Here we report a systematic investigation, by means of soft X-ray absorption spectroscopy (sXAS), on cubic and tetragonal CoxMn3-xO4 (x = 1, 1.5, 2) spinel oxides as a family of highly active catalysts for the oxygen reduction reaction (ORR). We demonstrate that the ORR activity for oxide catalysts primarily correlates to the partial covalency of between O 2p orbital with Mn4+ 3d t2g-down/eg-up, Mn3+ 3d eg-up and Co3+ 3d eg-up orbitals in octahedron, which is directly revealed by the O K-edge sXAS. Our findings propose the critical influences of the partial covalency between oxygen 2p band and specific metal 3d band on the competition between intermediates displacement of the ORR, and thus highlight the importance of electronic structure in controlling oxide catalytic activity.

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