scholarly journals Small Naked Pt Nanoparticles Confined in Mesoporous Shell of Hollow Carbon Spheres for High-Performance Nonenzymatic Sensing of H2O2 and Glucose

ACS Omega ◽  
2018 ◽  
Vol 3 (1) ◽  
pp. 96-105 ◽  
Author(s):  
Chunmei Zhang ◽  
Ruizhong Zhang ◽  
Xiaohui Gao ◽  
Chunfeng Cheng ◽  
Lin Hou ◽  
...  
Keyword(s):  
High Performance ◽  
Pt Nanoparticles ◽  
Carbon Spheres ◽  
Nonenzymatic Sensing ◽  
Mesoporous Shell ◽  
Hollow Carbon ◽  
Hollow Carbon Spheres

Surface Functionalization of Ordered Mesoporous Hollow Carbon Spheres with Ru Organometallic Compounds as Supports of Low-Pt Content Nanocatalysts for Alkaline Hydrogen and Oxygen Evolution Reactions

MRS Advances ◽  
2020 ◽  
Vol 5 (57-58) ◽  
pp. 2973-2989
Author(s):  
J.C. Martínez-Loyola ◽  
I.L. Alonso-Lemus ◽  
M.E. Sánchez-Castro ◽  
B. Escobar-Morales ◽  
J.R. Torres-Lubián ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
High Performance ◽  
Pt Nanoparticles ◽  
Organometallic Compounds ◽  
High Catalytic Activity ◽  
Carbon Spheres ◽  
Ordered Mesoporous ◽  
Electrochemical Water Splitting ◽  
Hollow Carbon ◽  
Hollow Carbon Spheres

AbstractHerein, we report a methodology that leads to the formation of Ru metallic sites, followed by the development and anchorage of Pt-Ru alloyed nanoparticles on the surface of Ordered Mesoporous Hollow Carbon Spheres (OMHCS). Along with the Ru sites, it is demonstrated that the functionalization promotes the formation of functional groups on the surface of the OMHCS. In a first stage, OMHCS are functionalized with the [(η6-C6H5OCH2CH2OH)RuCl2]2 (Ru-dim) and [(η6-C6H4CH(CH3)2CH3)RuCl2]2 (Ru-cym) organometallic compounds. Afterwards, Pt nanoparticles are dispersed by the microwave-assisted polyol method over the functionalized supports obtaining the low-metal content 5 wt. % Pt/OMHCSRu-dim and Pt/OMHCSRu-cym nanocatalysts. The degree of Ru alloyed is found to be around 35%. The low-Pt content Pt/OMHCSRu-cym and Pt/OMHCSRu-dim exhibit a higher catalytic activity for the Oxygen (OER) and the Hydrogen (HER) Evolution Reactions than the Pt/C benchmark and the Pt/OMHCS nanocatalysts. The overpotential for the OER at 10 mA cm-2 (ηOER) is 300 mV and 210 mV smaller at Pt/OMHCSRu-cym and Pt/OMHCSRu-dim compared to Pt/C, respectively. The corresponding values of the HER at -10 mA cm-2 (ηHER) are 14 and 18 mV smaller, respectively. The high catalytic activity of Pt/OMHCSRu-cym and Pt/OMHCSRu-dim has been attributed in part to the presence of Ru0 and RuO2 species from organometallic functionalization, and the modification of the d-valence band of Pt. Their high performance for the OER and the HER opens new lines of research for the design of nanocatalysts for alkaline electrochemical water splitting.

N-doped hierarchical porous hollow carbon spheres with multi-cavities for high performance Na-ion storage

2021 ◽  
Vol 506 ◽  
pp. 230170
Author(s):  
Lantao Liu ◽  
Xiangyu Sun ◽  
Yue Dong ◽  
Dengke Wang ◽  
Zheng Wang ◽  
...  
Keyword(s):  
High Performance ◽  
Carbon Spheres ◽  
Hierarchical Porous ◽  
Ion Storage ◽  
Hollow Carbon ◽  
Hollow Carbon Spheres

Hollow carbon spheres/graphene hybrid aerogels as high-performance adsorbents for organic pollution

2019 ◽  
Vol 213 ◽  
pp. 524-532 ◽  
Author(s):  
Pengchao Hou ◽  
Guangjian Xing ◽  
Leyuan Tian ◽  
Gang Zhang ◽  
Hao Wang ◽  
...  
Keyword(s):  
High Performance ◽  
Organic Pollution ◽  
Carbon Spheres ◽  
Hybrid Aerogels ◽  
Hollow Carbon ◽  
Hollow Carbon Spheres

Porous nitrogen-doped hollow carbon spheres derived from polyaniline for high performance supercapacitors

2014 ◽  
Vol 2 (15) ◽  
pp. 5352-5357 ◽  
Author(s):  
Jinpeng Han ◽  
Guiyin Xu ◽  
Bing Ding ◽  
Jin Pan ◽  
Hui Dou ◽  
...  
Keyword(s):  
Porous Structure ◽  
High Performance ◽  
Nitrogen Doping ◽  
Electrode Materials ◽  
Carbon Spheres ◽  
Hierarchical Porous Structure ◽  
Nitrogen Doped ◽  
Hierarchical Porous ◽  
Hollow Carbon ◽  
Hollow Carbon Spheres

The porous nitrogen-doped hollow carbon spheres derived from polyaniline are promising electrode materials for high performance supercapacitors due to their hierarchical porous structure and nitrogen-doping.

scholarly journals Ultrathin MnO2 nanoflakes grown on N-doped hollow carbon spheres for high-performance aqueous zinc ion batteries

2020 ◽  
Vol 4 (1) ◽  
pp. 213-221 ◽  
Author(s):  
Linlin Chen ◽  
Zhanhong Yang ◽  
Fan Cui ◽  
Jinlei Meng ◽  
Yinan Jiang ◽  
...  
Keyword(s):  
High Performance ◽  
Cycling Performance ◽  
Zinc Ion ◽  
Carbon Spheres ◽  
Hollow Carbon ◽  
Hollow Carbon Spheres

Ultrathin MnO2 nanoflakes grown on N-doped hollow carbon spheres are demonstrated to display improved rate and cycling performance in AZIBs.

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