Hollow Carbon Spheres Encapsulating Metal Nanoparticles for CO2 Hydrogenation Reactions

2021 ◽  
pp. 425-440
Author(s):  
Guoxiang Yang ◽  
Yasutata Kuwahara ◽  
Kohsuke Mori ◽  
Hiromi Yamashita
Keyword(s):  
Metal Nanoparticles ◽  
Co2 Hydrogenation ◽  
Carbon Spheres ◽  
Hydrogenation Reactions ◽  
Hollow Carbon ◽  
Hollow Carbon Spheres

scholarly journals A covalent organic framework-based route to the in situ encapsulation of metal nanoparticles in N-rich hollow carbon spheres

2016 ◽  
Vol 7 (9) ◽  
pp. 6015-6020 ◽  
Author(s):  
Liyu Chen ◽  
Lei Zhang ◽  
Zhijie Chen ◽  
Hongli Liu ◽  
Rafael Luque ◽  
...  
Keyword(s):  
Metal Nanoparticles ◽  
Hollow Structure ◽  
Catalytic Performance ◽  
Hybrid Nanocomposites ◽  
Covalent Organic Frameworks ◽  
Carbon Spheres ◽  
Covalent Organic Framework ◽  
Hollow Carbon ◽  
Hollow Carbon Spheres

Covalent organic frameworks doped with metal cations can be used as novel precursors for the in situ encapsulation of metal NPs into N doped hollow carbon spheres. The integration of the hollow structure, N dopant and ultrafine Pd NPs gives the hybrid nanocomposites advanced catalytic performance.

Enhanced catalytic activity of low-Pt content nanocatalysts supported on hollow carbon spheres for the ORR in alkaline media

MRS Advances ◽  
2020 ◽  
Vol 5 (57-58) ◽  
pp. 2961-2972
Author(s):  
P.C. Meléndez-González ◽  
E. Garza-Duran ◽  
J.C. Martínez-Loyola ◽  
P. Quintana-Owen ◽  
I.L. Alonso-Lemus ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Anion Exchange ◽  
Average Particle Size ◽  
Synthesis Method ◽  
Alkaline Media ◽  
High Catalytic Activity ◽  
Average Particle ◽  
Carbon Spheres ◽  
Hollow Carbon ◽  
Hollow Carbon Spheres

In this work, low-Pt content nanocatalysts (≈ 5 wt. %) supported on Hollow Carbon Spheres (HCS) were synthesized by two routes: i) colloidal conventional polyol, and ii) surfactant-free Bromide Anion Exchange (BAE). The nanocatalysts were labelled as Pt/HCS-P and Pt/HCS-B for polyol and BAE, respectively. The physicochemical characterization of the nanocatalysts showed that by following both methods, a good control of chemical composition was achieved, obtaining in addition well dispersed nanoparticles of less than 3 nm TEM average particle size (d) on the HCS. Pt/HCS-B contained more Pt0 species than Pt/HCS-P, an effect of the synthesis method. In addition, the structure of the HCS remains more ordered after BAE synthesis, compared to polyol. Regarding the catalytic activity for the Oxygen Reduction Reaction (ORR) in 0.5 M KOH, Pt/HCS-P and Pt/HCS-B showed a similar performance in terms of current density (j) at 0.9 V vs. RHE than the benchmark commercial 20 wt. % Pt/C. However, Pt/HCS-P and Pt/HCS-B demonstrated a 6 and 5-fold increase in mass catalytic activity compared to Pt/C, respectively. A positive effect of the high specific surface area of the HCS and its interactions with metal nanoparticles and electrolyte, which promoted the mass transfer, increased the performance of Pt/HCS-P and Pt/HCS-B. The high catalytic activity showed by Pt/HCS-B and Pt/HCS-P for the ORR, even with a low-Pt content, make them promising cathode nanocatalysts for Anion Exchange Membrane Fuel Cells (AEMFC).

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

Recent progress on the design of hollow carbon spheres to host sulfur in room-temperature sodium–sulfur batteries

2020 ◽  
Vol 35 (6) ◽  
pp. 630-645
Author(s):  
Jia-ying Yang ◽  
Hao-jie Han ◽  
Hlib Repich ◽  
Ri-cheng Zhi ◽  
Chang-zhen Qu ◽  
...  
Keyword(s):  
Room Temperature ◽  
Recent Progress ◽  
Carbon Spheres ◽  
Hollow Carbon ◽  
Sodium Sulfur ◽  
Hollow Carbon Spheres

Surface Polymerization and Controlled Pyrolysis: Tailorable Synthesis of Bumpy Hollow Carbon Spheres for Energy Storage

Langmuir ◽  
2021 ◽  
Vol 37 (13) ◽  
pp. 4007-4015
Author(s):  
Qianyi Tao ◽  
Zhifeng Zhu ◽  
Sunjie Ye ◽  
Gaojian Lin ◽  
Hui Chen ◽  
...  
Keyword(s):  
Energy Storage ◽  
Carbon Spheres ◽  
Surface Polymerization ◽  
Hollow Carbon ◽  
Hollow Carbon Spheres

Nitrogen-doped hollow carbon spheres with a wrinkled surface: their one-pot carbonization synthesis and supercapacitor properties

2016 ◽  
Vol 52 (78) ◽  
pp. 11693-11696 ◽  
Author(s):  
Lei Liu ◽  
Shi-Da Xu ◽  
Qing Yu ◽  
Feng-Yun Wang ◽  
Hui-Ling Zhu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Core Shell ◽  
Carbon Spheres ◽  
Melamine Formaldehyde ◽  
One Pot ◽  
Nitrogen Doped ◽  
Wrinkled Surface ◽  
Hollow Carbon ◽  
Hollow Carbon Spheres

Nitrogen-doped hollow carbon spheres with a wrinkled surface were synthesized through direct pyrolysis of core–shell structured graphene oxide–resol@melamine formaldehyde composites.

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