Nano-confined multi-synthesis of a Li–Mg–N–H nanocomposite towards low-temperature hydrogen storage with stable reversibility

2015 ◽  
Vol 3 (24) ◽  
pp. 12646-12652 ◽  
Author(s):  
Guanglin Xia ◽  
Xiaowei Chen ◽  
Cuifeng Zhou ◽  
Chaofeng Zhang ◽  
Dan Li ◽  
...  
Keyword(s):  
Low Temperature ◽  
Hydrogen Storage ◽  
Carbon Spheres ◽  
De Re ◽  
Hollow Carbon ◽  
Hollow Carbon Spheres

De-/re-hydrogenation of Li2Mg(NH)2 at a temperature as low as 105 °C and stable reversibility through up to 20 cycles are successfully achieved by the nanosize-induced effects by double-shelled hollow carbon spheres.

Pd supported ordered mesoporous hollow carbon spheres (OMHCS) for hydrogen storage

2016 ◽  
Vol 647 ◽  
pp. 14-19 ◽  
Author(s):  
Beata Zielinska ◽  
Beata Michalkiewicz ◽  
Xuecheng Chen ◽  
Ewa Mijowska ◽  
Ryszard J. Kalenczuk
Keyword(s):  
Hydrogen Storage ◽  
Carbon Spheres ◽  
Ordered Mesoporous ◽  
Hollow Carbon ◽  
Hollow Carbon Spheres

Effect of Pd loading on hydrogen storage properties of disordered mesoporous hollow carbon spheres

2017 ◽  
Vol 42 (52) ◽  
pp. 30461-30469 ◽  
Author(s):  
Martyna Baca ◽  
Krzysztof Cendrowski ◽  
Paweł Banach ◽  
Beata Michalkiewicz ◽  
Ewa Mijowska ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Carbon Spheres ◽  
Hydrogen Storage Properties ◽  
Effect Of Pd ◽  
Hollow Carbon ◽  
Hollow Carbon Spheres ◽  
Storage Properties

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

scholarly journals A Comparison of Hydrogen Storage in Pt, Pd and Pt/Pd Alloys Loaded Disordered Mesoporous Hollow Carbon Spheres

Nanomaterials ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 639 ◽  
Author(s):  
Martyna Baca ◽  
Krzysztof Cendrowski ◽  
Wojciech Kukulka ◽  
Grzegorz Bazarko ◽  
Dariusz Moszyński ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Spillover Effect ◽  
Metal Hydrides ◽  
Hydrogen Uptake ◽  
Carbon Spheres ◽  
Ambient Conditions ◽  
Two Factors ◽  
Size Of Particles ◽  
Hollow Carbon ◽  
Hollow Carbon Spheres

Comprehensive study to evaluate the ability of hydrogen uptake by disordered mesoporous hollow carbon spheres doped witch metal such as Pt, Pd or Pt/Pd was conducted. They were synthesized facilely using sonication and then calcination process under vacuum at the temperature of 550 °C. The effect on hydrogen sorption at neat-ambient conditions (40 °C, up to 45 bar) was thoroughly analyzed. The results clearly revealed that metal functionalization has a significant impact on the hydrogen storage capacity as the mechanism of gas uptake depends on two factors: metal type and certain size of particles. Thus, functionalized spheres adsorb hydrogen by physisorption forming metal hydrides or metal hydrides combined with hydrogen spillover effect. As a result, a sample with narrower distribution of nanoparticles and smaller specific size exhibited enhanced hydrogen uptake.

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
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