Electrocatalytic activity of high specific surface area perovskite-type LaNiO3 via sol-gel route for electrolytic oxygen evolution in alkaline solution

1997 ◽  
Vol 22 (6) ◽  
pp. 557-562 ◽  
Author(s):  
R SINGH
2019 ◽  
Vol 55 (100) ◽  
pp. 15117-15120 ◽  
Author(s):  
Hong Wang ◽  
Wei Li ◽  
Zhiwei Zhu ◽  
Yijuan Wang ◽  
Pan Li ◽  
...  

An N-doped bio-carbon catalyst with a hierarchical interconnected macro/meso-porous structure and high specific surface area exhibited significantly enhanced electrocatalytic activity.


RSC Advances ◽  
2016 ◽  
Vol 6 (86) ◽  
pp. 83373-83379 ◽  
Author(s):  
Yang Fan ◽  
Yan Zhang ◽  
Ying Cui ◽  
Jiaoli Wang ◽  
Mengmeng Wei ◽  
...  

A porous ternary alloy Pt5PdCu5 was prepared, which exhibits a unique spherical network structure with a high specific surface area of 86.9 m2 g−1 and enhanced electrocatalytic activity towards methanol oxidation.


2013 ◽  
Vol 423-426 ◽  
pp. 523-527
Author(s):  
Xuan Liu ◽  
Zhen Fa Liu ◽  
Hao Lin Fu ◽  
Rui He ◽  
Li Hui Zhang

Phloroglucinol-resorcinol-formaldehyde organic aerogels (PRF) were prepared using phloroglucinol, resorcinol and formaldehyde in a sol-gel process, solvent replacement and drying at room temperature. The phloroglucinol-resorcinol-formaldehyde carbon aerogels (CPRF) were prepared by charring the PRF at high temperature under the aegis of helium flow. The microstructure of CPRF was characterized by infrared spectroscopy, specific surface area analyzer and scanning electron microscopy. The results showed that the CPRF had continuous network structure and high specific surface area.


2012 ◽  
Vol 519 ◽  
pp. 83-86 ◽  
Author(s):  
Guang Wu Liu ◽  
Xing Yuan Ni ◽  
Bin Zhou ◽  
Qiu Jie Yu

This paper deals with the synthesis of ultralow density silica aerogels using tetramethyl orthosilicate (TMOS) as the precursor via sol-gel process followed by supercritical drying using acetonitrile solvent extraction. Ultralow density silica aerogels with 6 mg/cc of density was made for the molar ratio by this method. The microstructure and morphology of the ultralow density silica aerogels was characterized by the specific surface area, SBET, SEM, and the pore size distribution techniques. The results show that the ultralow density silica aerogel has the high specific surface area of 812m2/g. Thermal conductivities at desired temperatures were analyzed by the transient plane heat source method. Thermal conductivity coefficients of silica aerogel monoliths changed from 0.024 to 0.043W/ (m K) as temperature increased to 400°C, revealed an excellent heat insulation effect during thermal process.


RSC Advances ◽  
2016 ◽  
Vol 6 (7) ◽  
pp. 5611-5620 ◽  
Author(s):  
Xiaodong Wu ◽  
Gaofeng Shao ◽  
Xiaodong Shen ◽  
Sheng Cui ◽  
Ling Wang

We have developed a new sol–gel route to synthesise Al2O3–SiO2composite aerogels with different alumina/silica (Al/Si) molar ratios using an inexpensive inorganic salt.


2007 ◽  
Vol 336-338 ◽  
pp. 2286-2289
Author(s):  
Fei He ◽  
Xiao Dong He ◽  
Yao Li

Low-density xSiO2-(1-x)Al2O3 xerogels with x=0.9, 0.8, 0.7, 0.6 (mole fractions) were prepared by sol-gel and non-supercritical drying. Silica alkogels, which were the framework of binary composite materials, formed from tetraethyl orthosilicate (TEOS) by hydrolytic condensation with a molar ratio of TEOS: H2O: alcohol: hydrochloric acid: ammonia =1: 4: 10: 7.5×10-4: 0.0375. Aluminum hydroxide derived from Al(NO3)3·9H2O and NH4OH acting in the alcohol solution under the condition of catalyst. After filtrating and washing, the precipitation was mixed into silica sols to form SiO2-Al2O3 mixed oxide gels with different silicon and aluminum molar ratio. The structural change and crystallization of the binary xerogels were investigated after heat treatment at 600 for 2 h by the means of X-ray diffraction. Nitrogen adsorption experiment was performed to estimate specific surface area, porous volume and pore size distribution. The structural change of xerogels was observed by FT-IR spectroscopy. The resulting mixed xerogels possess of mesoporous structure which is characteristic of cylindrical pores, high specific surface area of 596-863 m2/g and a relatively narrow pore distribution of 2.8-30 nm. Al2O3 is introduced into the SiO2 phase and some of Al-O-Si bonds form.


1994 ◽  
Vol 9 (9) ◽  
pp. 2398-2403 ◽  
Author(s):  
Chang S. Hong ◽  
P. Ravindranathan ◽  
Dinesh K. Agrawal ◽  
Rustum Roy

Ca0.5Sr0.5Zr4P6O24 (CSZP) powders were prepared by the decomposition/combustion method using Ca(NO3)2 · 4H2O, Sr(NO3)2, ZrO(NO3)2 · xH2O, NH4H2PO4, urea, and NH4NO3 as starting materials. The homogenized slurries of the mixture were heated at 500 °C for 5 min to obtain CSZP powders. The as-synthesized powders were amorphous and crystallized after heating 800 °C for 2 h. The specific surface area of the powder was varied with the batch weight of starting materials or the amount of urea and ammonium nitrate. Powders with high specific surface area (150 m2/g) could be produced by this method. The sinterability of the powders was comparable to that of sol-gel derived powders. The sintered density of the compacts was 99% of theoretical after firing in air at 1350 °C for 6 h.


RSC Advances ◽  
2016 ◽  
Vol 6 (31) ◽  
pp. 26271-26279 ◽  
Author(s):  
Jingfeng Yang ◽  
Qihua Wang ◽  
Tingmei Wang ◽  
Yongmin Liang

In this study, we developed a new and rapid preparation method of alumina aerogels based on the sol–gel method and supercritical drying technique and prepared alumina aerogels with high specific surface area.


RSC Advances ◽  
2017 ◽  
Vol 7 (89) ◽  
pp. 56713-56720 ◽  
Author(s):  
Chao Lv ◽  
Gao Wu ◽  
Kai Xi Liu ◽  
Yi Song Zhu ◽  
Yan Hong Yin ◽  
...  

The WO3·H2O rod with diameter and length of 20 and 100 nm was controlled by citric acid and DWCNTs. When the samples were heated in air and carbonized in nitrogen, WC nanorods with high specific surface area of 32.2 m2 g−1 were obtained.


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