Monocrystalline Ni12P5hollow spheres with ultrahigh specific surface areas as advanced electrocatalysts for the hydrogen evolution reaction

2016 ◽  
Vol 4 (25) ◽  
pp. 9755-9759 ◽  
Author(s):  
Jinfa Chang ◽  
Songtao Li ◽  
Guoqiang Li ◽  
Junjie Ge ◽  
Changpeng Liu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Specific Surface ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Hollow Spheres ◽  
Microemulsion Method ◽  
Acidic Solutions ◽  
Surface Areas ◽  
Specific Surface Areas

Monocrystalline Ni12P5hollow spheres with ultrahigh specific surface areas were synthesized by a water-in-oil microemulsion method, which exhibited excellent catalytic activity and ultrastrong stability towards the hydrogen evolution reaction in acidic solutions.

Durability of Mo-Ni Intermetallic Compounds in the Hydrogen Evolution Reaction

2020 ◽  
Author(s):  
Leonard Rößner ◽  
Holger Schwarz ◽  
Igor Veremchuk ◽  
Ridha Zerdoumi ◽  
Thomas Seyller ◽  
...  
Keyword(s):  
Specific Surface ◽  
Intermetallic Compounds ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Single Phase ◽  
Alkaline Media ◽  
Potential Influence ◽  
Surface Areas ◽  
Phase Intermetallic ◽  
Specific Surface Areas

Molybdenum-nickel materials are catalysts of industrial interest for the hydrogen evolution reaction (HER). This contribution investigates the potential influence of ordered crystal structures on the catalytic activity. Well-characterized surfaces of the single-phase intermetallic compounds Ni7Mo7, Ni3Mo and Ni4Mo were subjected to accelerated durability tests (ADTs) and thorough characterization to unravel, whether crystallographic ordering affects the activity. Due to their intrinsic instability, molybdenum is leached resulting in higher specific surface areas and nickel-rich surfaces. The gain in surface area scales with the applied potential and the molybdenum content of the pristine samples. The nickel-enriched surfaces are more prone to form Ni(OH)2 layers, which leads to deactivation of the Mo-Ni materials. The crystal structure of the intermetallic compounds has, due to the intrinsic instability of the materials in alkaline media, no effect on the activity. The earlier as durable identified Ni7Mo7 proves to be highly unstable in the applied ADTs. The results indicate that the enhanced activity of unsupported bulk Mo-Ni electrodes can solely be ascribed to increased specific surface areas.

scholarly journals Durability of Mo-Ni Intermetallic Compounds in the Hydrogen Evolution Reaction

2020 ◽  
Author(s):  
Leonard Rößner ◽  
Holger Schwarz ◽  
Igor Veremchuk ◽  
Ridha Zerdoumi ◽  
Thomas Seyller ◽  
...  
Keyword(s):  
Specific Surface ◽  
Intermetallic Compounds ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Single Phase ◽  
Alkaline Media ◽  
Potential Influence ◽  
Surface Areas ◽  
Phase Intermetallic ◽  
Specific Surface Areas

Molybdenum-nickel materials are catalysts of industrial interest for the hydrogen evolution reaction (HER). This contribution investigates the potential influence of ordered crystal structures on the catalytic activity. Well-characterized surfaces of the single-phase intermetallic compounds Ni7Mo7, Ni3Mo and Ni4Mo were subjected to accelerated durability tests (ADTs) and thorough characterization to unravel, whether crystallographic ordering affects the activity. Due to their intrinsic instability, molybdenum is leached resulting in higher specific surface areas and nickel-rich surfaces. The gain in surface area scales with the applied potential and the molybdenum content of the pristine samples. The nickel-enriched surfaces are more prone to form Ni(OH)2 layers, which leads to deactivation of the Mo-Ni materials. The crystal structure of the intermetallic compounds has, due to the intrinsic instability of the materials in alkaline media, no effect on the activity. The earlier as durable identified Ni7Mo7 proves to be highly unstable in the applied ADTs. The results indicate that the enhanced activity of unsupported bulk Mo-Ni electrodes can solely be ascribed to increased specific surface areas.

CATALYTIC ACTIVITY FOR METHANE OXIDATION OF GOETHITE SUPPORTED ON ALUMINA

2006 ◽  
Vol 20 (25n27) ◽  
pp. 4249-4254 ◽  
Author(s):  
KEI-ICHIRO MURAI ◽  
KOHEI TOMITA ◽  
SUGURU TOJO ◽  
TOSHIHIRO MORIGA ◽  
ICHIRO NAKABAYASHI
Keyword(s):  
Catalytic Activity ◽  
Specific Surface ◽  
Methane Oxidation ◽  
Model Experiment ◽  
The Other ◽  
Catalytic Activities ◽  
Surface Areas ◽  
Oxidation Of Methane ◽  
Other Hand ◽  
Specific Surface Areas

Two kinds of α- Fe 2 O 3 catalysts supported on χ- Al 2 O 3 and γ- Al 2 O 3 were synthesized. α- Fe 2 O 3 was prepared from α- FeOOH . As a model experiment, an investigation was made with the oxidation of methane. As all catalysts with various Fe contents supported on χ- Al 2 O 3 with various Fe contents had higher specific surface areas than those supported on γ- Al 2 O 3, α- Fe 2 O 3/χ- Al 2 O 3 catalyst has higher catalytic activities than α- Fe 2 O 3/γ- Al 2 O 3 catalyst. From SEM-EDS analyses, it is concluded that in α- Fe 2 O 3/χ- Al 2 O 3 catalyst, α- Fe 2 O 3 exists mainly on the surface of the support, because of flatness of the surface of χ- Al 2 O 3. On the other hand, in the case of α- Fe 2 O 3/γ- Al 2 O 3 catalyst, as the surface of support, γ- Al 2 O 3, is uneven, α- Fe 2 O 3 do not partially exist on the surface but in the pores.

Truxene-based porous polymers: from synthesis to catalytic activity

2018 ◽  
Vol 9 (36) ◽  
pp. 4585-4595 ◽  
Author(s):  
Jordy Guadalupe ◽  
Ana M. Ray ◽  
Eva M. Maya ◽  
Berta Gómez-Lor ◽  
Marta Iglesias
Keyword(s):  
Catalytic Activity ◽  
Specific Surface ◽  
Porous Polymers ◽  
Organic Polymers ◽  
Porous Organic Polymers ◽  
Surface Areas ◽  
Specific Surface Areas

New, robust, insoluble porous organic polymers based on the semiconducting platform of hexamethyltruxene with high Brunauer–Emmett–Teller specific surface areas and interesting catalytic activity are presented.

Effect of Different Silicate Supports on the Catalytic Performance of MoVTeO Mixed Oxides in Partial Oxidation of Isobutane

2014 ◽  
Vol 12 (1) ◽  
pp. 623-628
Author(s):  
Jing Hu ◽  
Zhifang Li ◽  
Xiaoyuan Yang ◽  
Wenli Ding ◽  
Jingqi Guan
Keyword(s):  
Catalytic Activity ◽  
Specific Surface ◽  
Surface Area ◽  
Partial Oxidation ◽  
Mixed Oxides ◽  
Supported Catalysts ◽  
Catalytic Performance ◽  
Surface Areas ◽  
Specific Surface Areas ◽  
Mcm 41

Abstract A series of 5% MoV0.3Te0.25 supported on different silicates (i.e. SiO2, HMS, MCM-41, and MCM-48) have been prepared, characterized, and tested as catalysts in the partial oxidation of isobutane to methacrolein. Characterization results showed that the supports almost kept intact structures after supporting 5 wt.% MoV0.3Te0.25 and the supported catalysts had large specific surface areas. Catalytic tests showed that the specific surface area played a key role in the catalytic activity for the supported catalysts.

N-doped carbon nanocages with high catalytic activity and durability for oxygen reduction

2015 ◽  
Vol 3 (23) ◽  
pp. 12427-12435 ◽  
Author(s):  
Xiao Xia Wang ◽  
Biao Zou ◽  
Xin Xin Du ◽  
Jian Nong Wang
Keyword(s):  
Catalytic Activity ◽  
Oxygen Reduction Reaction ◽  
Specific Surface ◽  
Oxygen Reduction ◽  
Reduction Reaction ◽  
High Catalytic Activity ◽  
Surface Areas ◽  
Excellent Activity ◽  
Specific Surface Areas

N-doped carbon nanocages with high specific surface areas exhibited excellent activity and durability for oxygen reduction reaction in acidic electrolytes.

Synergetic Effect of Ni2P and MXene Enhances Catalytic Activity in the Hydrogen Evolution Reaction

2021 ◽  
Vol 60 (3) ◽  
pp. 1604-1611
Author(s):  
Zepeng Lv ◽  
Meng Wang ◽  
Dong Liu ◽  
Kailiang Jian ◽  
Run Zhang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Synergetic Effect
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