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.

Heterostructured CoO-Co3O4 nanoparticles anchored on nitrogen-doped hollow carbon spheres as cathode catalysts for Li–O2 batteries

Nanoscale ◽  
2019 ◽  
Vol 11 (31) ◽  
pp. 14769-14776 ◽  
Author(s):  
Lixia Feng ◽  
Yongliang Li ◽  
Lingna Sun ◽  
Hongwei Mi ◽  
Xiangzhong Ren ◽  
...  
Keyword(s):  
Cathode Material ◽  
Catalytic Performance ◽  
Co3o4 Nanoparticles ◽  
Carbon Spheres ◽  
Simple Method ◽  
Cathode Catalysts ◽  
Nitrogen Doped ◽  
Lithium Oxygen Battery ◽  
Hollow Carbon ◽  
Hollow Carbon Spheres

CoO-Co3O4 nanoparticles coated on nitrogen-doped hollow carbon spheres (N-HC@CoO-Co3O4) are prepared by a simple method, and N-HC@CoO-Co3O4 when used as the cathode material for a lithium–oxygen battery shows high catalytic performance.

In situ formation of nitrogen-doped carbon nanoparticles on hollow carbon spheres as efficient oxygen reduction electrocatalysts

Nanoscale ◽  
2016 ◽  
Vol 8 (42) ◽  
pp. 18134-18142 ◽  
Author(s):  
Tingsheng Zhou ◽  
Yao Zhou ◽  
Ruguang Ma ◽  
Zhenzhen Zhou ◽  
Guanghui Liu ◽  
...  
Keyword(s):  
Oxygen Reduction ◽  
Carbon Nanoparticles ◽  
Carbon Spheres ◽  
Nitrogen Doped ◽  
In Situ Formation ◽  
Hollow Carbon ◽  
Nitrogen Doped Carbon ◽  
Hollow Carbon Spheres

In situ deposition of Pd nanoparticles with controllable diameters in hollow carbon spheres for hydrogen storage

2013 ◽  
Vol 38 (36) ◽  
pp. 16179-16184 ◽  
Author(s):  
Karolina Wenelska ◽  
Beata Michalkiewicz ◽  
Jiang Gong ◽  
Tao Tang ◽  
Ryszard Kaleńczuk ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Pd Nanoparticles ◽  
Carbon Spheres ◽  
In Situ Deposition ◽  
Hollow Carbon ◽  
Hollow Carbon Spheres

In situ construction of hollow carbon spheres with N, Co, and Fe co-doping as electrochemical sensors for simultaneous determination of dihydroxybenzene isomers

Nanoscale ◽  
2019 ◽  
Vol 11 (18) ◽  
pp. 8950-8958 ◽  
Author(s):  
Hui Yang ◽  
Shunxing Li ◽  
Huiwu Yu ◽  
Fengying Zheng ◽  
Luxiu Lin ◽  
...  
Keyword(s):  
Active Sites ◽  
High Performance ◽  
Electrode Materials ◽  
Electrochemical Sensors ◽  
Carbon Spheres ◽  
Co Doping ◽  
Hollow Carbon ◽  
Hollow Carbon Spheres

Control of the active sites/centers plays an important role in the design of novel electrode materials with unusual properties and achievement of sensors with high performance.

In situ confinement pyrolysis of ZIF-67 nanocrystals on hollow carbon spheres towards efficient electrocatalysts for oxygen reduction

2021 ◽  
Vol 584 ◽  
pp. 439-448
Author(s):  
Lin Zhong ◽  
Hu Zhou ◽  
Ruifeng Li ◽  
Ting Bian ◽  
Sheng Wang ◽  
...  
Keyword(s):  
Oxygen Reduction ◽  
Carbon Spheres ◽  
Hollow Carbon ◽  
Hollow Carbon Spheres

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).

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