Preparation of high specific surface area composite carbon cryogels from self-assembly of graphene oxide and resorcinol monomers for supercapacitors

Titanium dioxide (TiO2) is one of the most well known photocatalytic materials. However, TiO2 is only photoactive to ultraviolet (UV) light, and the lifetime of the electron-hole pair recombination is too short. In this work, TiO2 anatase nanotubes with an energy band gap of 3.01 eV and specific surface area of 112.46 m2/g were synthesized via hydrothermal method. The results showed that, by incorporating graphene oxide (XGO) and reduced graphene oxide (RGO), the photodegradation efficiency could be enhanced by increasing electron lifetime and charge carrier separation, as well as narrowing the energy band gap. The examination of photodegradation activity under UVC irradiation indicated that a maximum photodegradation efficiency was achieved with TiO2-XGO nanocomposite due to its high specific surface area and strong hydrophilic property.

Download Full-text

Aerosol-Assisted Sol-Gel Synthesis of Mesoporous TiO2 Materials, and Their Use as Support for Ru-Based Methanation Catalysts

10.26434/chemrxiv.7824053.v1 ◽

2019 ◽

Author(s):

Ara Kim ◽

Clément Sanchez ◽

Bernard Haye ◽

Cédric Boissière ◽

Capucine Sassoye ◽

...

Keyword(s):

Specific Surface ◽

Surface Area ◽

Specific Surface Area ◽

Self Assembly ◽

Sol Gel ◽

Textural Properties ◽

High Specific Surface Area ◽

Spherical Particles ◽

Aerosol Process ◽

Evaporation Induced Self Assembly

<div>Mesoporous TiO2 materials have been prepared by an aerosol process, which leverages on the acetic acid-mediated sol-gel chemistry and on the evaporation-induced self-assembly phenomenon to obtain materials with high specific surface area and large mesoporous volume. The obtained spherical particles are calcined to release the porosity. It is shown that the mesoscopic order can be preserved when the calcination is carried out at relatively low temperature (375 °C and below). Harsher calcination conditions lead to the progressive destruction of the mesostructured, concomitant with a progressive drop of textural properties and with the crystallization of larger anatase domains. The mesoporous TiO2 material calcined at 350°C (specific surface area = 260 m².g-1; pore volume = 0.36 cm³.-1; mean pore diameter = 5.4 nm) was selected as a promising support for preformed RuO2 nanoparticles, and subsequently annealed in air. It is shown that the presence of RuO2 nanoparticles and subsequent annealing provoke further intense modification of the texture and crystallinity of the TiO2 materials. In addition to a drop in the textural parameters, a RuO2-mediated crystallization of rutile TiO2 is highlighted at temperature as low as 250°C. After an in situ reduction in H2, the catalysts containing TiO2 rutile and relatively small RuO2 crystals showed the highest activity in the methanation of CO2. </div>

Download Full-text

Aerosol-Assisted Sol-Gel Synthesis of Mesoporous TiO2 Materials, and Their Use as Support for Ru-Based Methanation Catalysts

10.26434/chemrxiv.7824053 ◽

2019 ◽

Author(s):

Ara Kim ◽

Clément Sanchez ◽

Bernard Haye ◽

Cédric Boissière ◽

Capucine Sassoye ◽

...

Keyword(s):

Specific Surface ◽

Surface Area ◽

Specific Surface Area ◽

Self Assembly ◽

Sol Gel ◽

Textural Properties ◽

High Specific Surface Area ◽

Spherical Particles ◽

Aerosol Process ◽

Evaporation Induced Self Assembly

<div>Mesoporous TiO2 materials have been prepared by an aerosol process, which leverages on the acetic acid-mediated sol-gel chemistry and on the evaporation-induced self-assembly phenomenon to obtain materials with high specific surface area and large mesoporous volume. The obtained spherical particles are calcined to release the porosity. It is shown that the mesoscopic order can be preserved when the calcination is carried out at relatively low temperature (375 °C and below). Harsher calcination conditions lead to the progressive destruction of the mesostructured, concomitant with a progressive drop of textural properties and with the crystallization of larger anatase domains. The mesoporous TiO2 material calcined at 350°C (specific surface area = 260 m².g-1; pore volume = 0.36 cm³.-1; mean pore diameter = 5.4 nm) was selected as a promising support for preformed RuO2 nanoparticles, and subsequently annealed in air. It is shown that the presence of RuO2 nanoparticles and subsequent annealing provoke further intense modification of the texture and crystallinity of the TiO2 materials. In addition to a drop in the textural parameters, a RuO2-mediated crystallization of rutile TiO2 is highlighted at temperature as low as 250°C. After an in situ reduction in H2, the catalysts containing TiO2 rutile and relatively small RuO2 crystals showed the highest activity in the methanation of CO2. </div>

Download Full-text

Preparation of lightweight and high specific surface area ceramsites with sewage sludge

JOURNAL OF SHENZHEN UNIVERSITY SCIENCE AND ENGINEERING ◽

10.3724/sp.j.1249.2014.04374 ◽

2014 ◽

Vol 31 (4) ◽

pp. 374

Author(s):

Ziyi Su ◽

Jiang Yu ◽

Ci Wang ◽

Jianquan Liu ◽

Jin Hu

Keyword(s):

Sewage Sludge ◽

Specific Surface ◽

Surface Area ◽

Specific Surface Area ◽

High Specific Surface Area

Download Full-text

Nanoporous Quasi-High-Entropy Alloy Microspheres

Metals ◽

10.3390/met9030345 ◽

2019 ◽

Vol 9 (3) ◽

pp. 345 ◽

Cited By ~ 3

Author(s):

Lianzan Yang ◽

Yongyan Li ◽

Zhifeng Wang ◽

Weimin Zhao ◽

Chunling Qin

Keyword(s):

Mechanical Properties ◽

Solid Solution ◽

Specific Surface ◽

Surface Area ◽

Specific Surface Area ◽

High Specific Surface Area ◽

High Entropy Alloy ◽

Face Centered Cubic ◽

High Entropy ◽

Hierarchical Porous

High-entropy alloys (HEAs) present excellent mechanical properties. However, the exploitation of chemical properties of HEAs is far less than that of mechanical properties, which is mainly limited by the low specific surface area of HEAs synthesized by traditional methods. Thus, it is vital to develop new routes to fabricate HEAs with novel three-dimensional structures and a high specific surface area. Herein, we develop a facile approach to fabricate nanoporous noble metal quasi-HEA microspheres by melt-spinning and dealloying. The as-obtained nanoporous Cu30Au23Pt22Pd25 quasi-HEA microspheres present a hierarchical porous structure with a high specific surface area of 69.5 m2/g and a multiphase approximatively componential solid solution characteristic with a broad single-group face-centered cubic XRD pattern, which is different from the traditional single-phase or two-phase solid solution HEAs. To differentiate, these are named quasi-HEAs. The synthetic strategy proposed in this paper opens the door for the synthesis of porous quasi-HEAs related materials, and is expected to promote further applications of quasi-HEAs in various chemical fields.

Download Full-text

KCl-assisted activation: Moringa oleifera branch-derived porous carbon for high performance supercapacitor

New Journal of Chemistry ◽

10.1039/d1nj00046b ◽

2021 ◽

Vol 45 (12) ◽

pp. 5712-5719

Author(s):

Yongxiang Zhang ◽

Peifeng Yu ◽

Mingtao Zheng ◽

Yong Xiao ◽

Hang Hu ◽

...

Keyword(s):

Specific Surface ◽

Surface Area ◽

Specific Surface Area ◽

Porous Carbon ◽

High Performance ◽

Moringa Oleifera ◽

High Specific Surface Area ◽

Porous Carbons

Porous carbons with a high specific surface area (2314–3470 m2 g−1) are prepared via a novel KCl-assisted activation strategy for high-performance supercapacitor.

Download Full-text