Converting chicken manure into highly active N–P co-doped metal-free biocarbon electrocatalysts: effect of chemical treatment on their catalytic activity for the ORR

2019 ◽  
Vol 3 (5) ◽  
pp. 1307-1316 ◽  
Author(s):  
I. L. Alonso-Lemus ◽  
M. Z. Figueroa-Torres ◽  
D. Lardizabal-Gutíerrez ◽  
P. Bartolo-Pérez ◽  
J. C. Carrillo-Rodríguez ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Chemical Treatment ◽  
Raw Material ◽  
Chicken Manure ◽  
Metal Free ◽  
Highly Active ◽  
Co Doped

In this work, the use of chicken manure as the raw material for obtaining metal-free biocarbons as electrocatalysts was studied.

Enhancement mechanism of sulfur dopants on the catalytic activity of N and P co-doped three-dimensional hierarchically porous carbon as a metal-free oxygen reduction electrocatalyst

2019 ◽  
Vol 9 (21) ◽  
pp. 5906-5914 ◽  
Author(s):  
Yongxi Zan ◽  
Zhengping Zhang ◽  
Meiling Dou ◽  
Feng Wang
Keyword(s):  
Catalytic Activity ◽  
Oxygen Reduction ◽  
Porous Carbon ◽  
Three Dimensional ◽  
Nitrogen And Phosphorus ◽  
Free Oxygen ◽  
Hierarchically Porous ◽  
Metal Free ◽  
Enhancement Mechanism ◽  
Co Doped

A sulfur, nitrogen and phosphorus ternary-doped cattle-bone-derived hierarchically porous carbon metal-free electrocatalyst was synthesized, exhibiting superior oxygen reduction performance compared to Pt/C.

A nitrogen and boron co-doped metal-free carbon electrocatalyst for an efficient oxygen reduction reaction

2018 ◽  
Vol 5 (11) ◽  
pp. 2985-2991 ◽  
Author(s):  
Yunjie Zhou ◽  
Yue Sun ◽  
Huibo Wang ◽  
Cheng Zhu ◽  
Jin Gao ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Carbon Material ◽  
Reduction Reaction ◽  
Free Carbon ◽  
Metal Free ◽  
Co Doped

A N, B co-doped carbon material exhibits excellent catalytic activity for an oxygen reduction reaction.

A bi-functional metal-free catalyst composed of dual-doped graphene and mesoporous carbon for rechargeable lithium–oxygen batteries

2015 ◽  
Vol 3 (36) ◽  
pp. 18456-18465 ◽  
Author(s):  
Jae-Hong Kim ◽  
Aravindaraj G. Kannan ◽  
Hyun-Sik Woo ◽  
Dae-Gun Jin ◽  
Wonkeun Kim ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Oxygen Reduction ◽  
Mesoporous Carbon ◽  
Metal Free ◽  
Doped Graphene ◽  
Lithium Oxygen Batteries ◽  
Co Doped

Nitrogen and sulfur co-doped graphene/mesoporous carbon exhibited high bi-functional catalytic activity toward oxygen reduction and evolution reactions.

Large-scale preparation of B/N co-doped graphene-like carbon as an efficient metal-free catalyst for the reduction of nitroarenes

2018 ◽  
Vol 42 (4) ◽  
pp. 2718-2725 ◽  
Author(s):  
Fan Yang ◽  
Yan Cao ◽  
Zhuo Chen ◽  
Xing He ◽  
Liqiang Hou ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Large Scale ◽  
Metal Free ◽  
Large Scale Preparation ◽  
Doped Graphene ◽  
Scale Preparation ◽  
Carbon Catalysts ◽  
Co Doped

Boron and nitrogen co-doped graphene-like carbon catalysts were fabricated by mechanochemistry and demonstrated outstanding catalytic activity for the reduction of nitroarenes.

S,N co-doped reduced graphene oxide sheets with cobalt hydroxide nanocrystals for highly active and stable bifunctional oxygen catalysts

2019 ◽  
Vol 6 (12) ◽  
pp. 3501-3509
Author(s):  
Sung-Woo Park ◽  
Hyun Jung Shin ◽  
Dong-Wan Kim
Keyword(s):  
Graphene Oxide ◽  
Catalytic Activity ◽  
Reduced Graphene Oxide ◽  
Noble Metal ◽  
Cobalt Hydroxide ◽  
Efficient Strategy ◽  
Highly Active ◽  
Reduced Graphene ◽  
Co Doped ◽  
Graphene Oxide Sheets

A Co(OH)2 anchored on S,N co-doped rGO as a highly active and stable bifunctional oxygen catalyst was developed via an efficient strategy and its catalytic activity was comparable to that of the benchmarked noble metal-based oxygen catalysts.

Kohlenstoffe als Katalysatoren für die Oxydation von schwefliger Säure / Carbons as Catalysts for the Oxidation of Sulfurous Acid

1979 ◽  
Vol 34 (2) ◽  
pp. 188-196 ◽  
Author(s):  
Michaela Zuckmantel ◽  
R. Kurth ◽  
H. P. Boehm
Keyword(s):  
Heat Treatment ◽  
Catalytic Activity ◽  
Surface Treatment ◽  
Chemical Treatment ◽  
Oxidation Rate ◽  
Sulfurous Acid ◽  
Carbon Blacks ◽  
Highly Active ◽  
Surface Oxides ◽  
Carbon Catalysts

Abstract Conductometric measurements of the catalytic oxydation of dilute aqueous sulfurous acid were used in the comparison of various carbon catalysts, e.g. active charcoals and carbon blacks. The oxidation rate is proportional to (Po2) 1/2 and to the amount of adsorbed HSO3- ions. Basic surface oxides are responsible for the HSO3 -adsorption. The catalytic activity of a carbon is influenced also by other factors than the concentration of basic surface oxides. It is changed by heat treatment of the carbon as well as by chemical treatment of its surface. Treatment with ammonia at 600 °C increases its activity dramatically, absolutely inactive carbon blacks were rendered highly active.

scholarly journals Non-PGM Electrocatalysts for PEM Fuel Cells: A DFT Study on the Effects of Fluorination of FeNx-Doped and N-Doped Carbon Catalysts

Molecules ◽  
2021 ◽  
Vol 26 (23) ◽  
pp. 7370
Author(s):  
Mohamed Cherif ◽  
Jean-Pol Dodelet ◽  
Gaixia Zhang ◽  
Vassili P. Glibin ◽  
Shuhui Sun ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Fuel Cells ◽  
Density Functional ◽  
Realistic Model ◽  
Pem Fuel Cells ◽  
Reduction Reaction ◽  
Graphene Layers ◽  
Metal Free ◽  
Highly Active ◽  
Carbon Catalysts

Fluorination is considered as a means of reducing the degradation of Fe/N/C, a highly active FeNx-doped disorganized carbon catalyst for the oxygen reduction reaction (ORR) in PEM fuel cells. Our recent experiments have, however, revealed that fluorination poisons the FeNx moiety of the Fe/N/C catalytic site, considerably reducing the activity of the resulting catalyst to that of carbon only doped with nitrogen. Using the density functional theory (DFT), we clarify in this work the mechanisms by which fluorine interacts with the catalyst. We studied 10 possible FeNx site configurations as well as 2 metal-free sites in the absence or presence of fluorine molecules and atoms. When the FeNx moiety is located on a single graphene layer accessible on both sides, we found that fluorine binds strongly to Fe but that two F atoms, one on each side of the FeNx plane, are necessary to completely inhibit the catalytic activity of the FeNx sites. When considering the more realistic model of a stack of graphene layers, only one F atom is needed to poison the FeNx moiety on the top layer since ORR hardly takes place between carbon layers. We also found that metal-free catalytic N-sites are immune to poisoning by fluorination, in accordance with our experiments. Finally, we explain how most of the catalytic activity can be recovered by heating to 900 °C after fluorination. This research helps to clarify the role of metallic sites compared to non-metallic ones upon the fluorination of FeNx-doped disorganized carbon catalysts.

Eco-friendly synthesis of N,S co-doped hierarchical nanocarbon as a highly efficient metal-free catalyst for the reduction of nitroarenes

Nanoscale ◽  
2018 ◽  
Vol 10 (46) ◽  
pp. 21764-21771 ◽  
Author(s):  
Sijie Liu ◽  
Liting Cui ◽  
Zhiyao Peng ◽  
Jingjing Wang ◽  
Yajing Hu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Metal Free ◽  
Highly Efficient ◽  
Co Doped

N,S co-doped hierarchical nanocarbon derived from an azo-sulphonate dye pollutant demonstrates superior catalytic activity for the reduction of nitroarenes.

Boron and nitrogen co-doped carbon dots as a metal-free catalyst for hydrogen generation from sodium borohydride

2016 ◽  
Vol 40 (10) ◽  
pp. 8823-8828 ◽  
Author(s):  
Mohammad Reza Nabid ◽  
Yasamin Bide ◽  
Nazanin Fereidouni
Keyword(s):  
Catalytic Activity ◽  
Synergistic Effect ◽  
Sodium Borohydride ◽  
Carbon Dots ◽  
Hydrogen Generation ◽  
High Catalytic Activity ◽  
Intrinsic Properties ◽  
Metal Free ◽  
Doped Carbon Dots ◽  
Co Doped

The high catalytic activity of B,N co-doped CDs is due to the synergistic effect of nitrogen and boron dopants and the intrinsic properties of carbon dots.

Deactivation of arenetitanium(II) bromoalane complexes in the cyclotrimerization of butadiene

1986 ◽  
Vol 51 (12) ◽  
pp. 2751-2759 ◽  
Author(s):  
Jindřich Poláček ◽  
Helena Antropiusová ◽  
Lidmila Petrusová ◽  
Karel Mach
Keyword(s):  
Catalytic Activity ◽  
Catalytic System ◽  
Model System ◽  
Highly Active ◽  
Catalytic Stability

The C6H6.Ti(II)(AlBr4)2 (Ib) catalyst deactivates during the butadiene cyclotrimerization to give a solid containing all titanium (mostly as TiBr3) and a mixture of AlBr3 and RAlBr2 compounds dissolved in benzene. The residual cationic catalytic activity of the deactivated Ib system is due to presence of AlBr3. In contrast to TiCl3, the deactivated Ib system and the model system TiBr3 + AlBr3 are not activated by the addition of EtAlCl2 in the presence of butadiene: the highly active benzenetitanium(II) system is re-constituted only after reduction of TiBr3 with Et3Al followed by the addition of EtAlCl2. The addition of Et2AlBr to Ib accelerates the deactivation of the system. Deactivation products of this system contain mainly Ti(II) species which forms benzenetitanium(II) catalytic system after addition of EtAlCl2. All the EtAlCl2 reactivated systems produce (Z, E, E)-1,5,9-cyclododecatriene with high catalytic stability and considerable selectivity (>90%). This behaviour points to the catalysis by benzenetitanium(II) chloroalane complexes containing only low amount of bromine atoms and ethyl groups.

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