Nano-structured hybrid molybdenum carbides/nitrides generated in situ for HER applications

2017 ◽  
Vol 5 (17) ◽  
pp. 7764-7768 ◽  
Author(s):  
Rajinder Kumar ◽  
Ritu Rai ◽  
Seema Gautam ◽  
Abir De Sarkar ◽  
Nidhi Tiwari ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Precious Metal ◽  
Molybdenum Carbide ◽  
Low Cost ◽  
Metal Free ◽  
Highly Efficient ◽  
Molybdenum Carbides ◽  
Supported Molybdenum Carbide

A highly efficient, low-cost (precious-metal-free), highly stable nanohybrid electrocatalyst containing carbon-supported molybdenum carbide and nitride nanoparticles of size ranging from 8 to 12 nm exhibit excellent HER catalytic activity.

Fabrication of a mesoporous Ba0.5Sr0.5Co0.8Fe0.2O3−δ perovskite as a low-cost and efficient catalyst for oxygen reduction

2017 ◽  
Vol 46 (40) ◽  
pp. 13903-13911 ◽  
Author(s):  
Xiangzhi Cui ◽  
Ryan O'Hayre ◽  
Svitlana Pylypenko ◽  
Linlin Zhang ◽  
Liming Zeng ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Precious Metal ◽  
Oxygen Vacancies ◽  
Low Cost ◽  
Cathode Catalyst ◽  
Methanol Tolerance ◽  
Efficient Catalyst ◽  
Metal Free ◽  
Redox Couples ◽  
Catalytic Stability

The redox couples Co4+/Co3+ and Fe3+/Fe2+, and oxygen vacancies in mesoporous Ba0.5Sr0.5Co0.8Fe0.2O3−δ endow the precious metal-free cathode catalyst with high ORR catalytic activity, and more importantly excellent methanol tolerance and electro-catalytic stability.

scholarly journals Converting copper sulfide to copper with surface sulfur for electrocatalytic alkyne semi-hydrogenation with water

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Yongmeng Wu ◽  
Cuibo Liu ◽  
Changhong Wang ◽  
Yifu Yu ◽  
Yanmei Shi ◽  
...  
Keyword(s):  
Binding Energy ◽  
Noble Metal ◽  
Atomic Hydrogen ◽  
Copper Sulfide ◽  
Low Cost ◽  
Water Electrolysis ◽  
Metal Free ◽  
Copper Nanowire

AbstractElectrocatalytic alkyne semi-hydrogenation to alkenes with water as the hydrogen source using a low-cost noble-metal-free catalyst is highly desirable but challenging because of their over-hydrogenation to undesired alkanes. Here, we propose that an ideal catalyst should have the appropriate binding energy with active atomic hydrogen (H*) from water electrolysis and a weaker adsorption with an alkene, thus promoting alkyne semi-hydrogenation and avoiding over-hydrogenation. So, surface sulfur-doped and -adsorbed low-coordinated copper nanowire sponges are designedly synthesized via in situ electroreduction of copper sulfide and enable electrocatalytic alkyne semi-hydrogenation with over 99% selectivity using water as the hydrogen source, outperforming a copper counterpart without surface sulfur. Sulfur anion-hydrated cation (S2−-K+(H2O)n) networks between the surface adsorbed S2− and K+ in the KOH electrolyte boost the production of active H* from water electrolysis. And the trace doping of sulfur weakens the alkene adsorption, avoiding over-hydrogenation. Our catalyst also shows wide substrate scopes, up to 99% alkenes selectivity, good reducible groups compatibility, and easily synthesized deuterated alkenes, highlighting the promising potential of this method.

MOF-derived M-OOH with rich oxygen defects by in-situ electro-oxidation reconstitution for highly efficient oxygen evolution reaction

2021 ◽  
Author(s):  
Zhikai Shi ◽  
Zebin Yu ◽  
Ronghua Jiang ◽  
Jun Huang ◽  
Yanping Hou ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Energy Production ◽  
Low Cost ◽  
Highly Efficient ◽  
Oxygen Defects ◽  
Electro Oxidation

The oxygen evolution reaction (OER) is an important half-reaction in the field of energy production. However, how effectively, simply, and greenly to prepare low-cost OER electrocatalysts remains a problem. Herein,...

Noble-metal-free NiFe nanoparticles immobilized on nano CeZrO2 solid solutions for highly efficient hydrogen production from hydrous hydrazine

2019 ◽  
Vol 3 (11) ◽  
pp. 3071-3077 ◽  
Author(s):  
Hongtao Zou ◽  
Qilu Yao ◽  
Meiling Huang ◽  
Meihua Zhu ◽  
Fei Zhang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Hydrogen Production ◽  
Noble Metal ◽  
Solid Solutions ◽  
Reduction Method ◽  
Hydrogen Generation ◽  
High Catalytic Activity ◽  
Metal Free ◽  
Highly Efficient ◽  
Hydrazine Solution

Noble-metal-free NiFe nanoparticles were successfully immobilized on nano CeZrO2 solid solutions by a simple impregnation–reduction method, exhibiting a high catalytic activity and 100% H2 selectivity for hydrogen generation from hydrazine solution.

scholarly journals CVD Synthesis of Supported Molybdenum Carbide Catalyst and its Catalytic Activity for CO2 Hydrogenation.

1995 ◽  
Vol 21 (6) ◽  
pp. 1015-1023 ◽  
Author(s):  
Toshihiro Miyao ◽  
Masakuni Matsuoka ◽  
Isao Shishikura ◽  
Masatoshi Nagai
Keyword(s):  
Catalytic Activity ◽  
Molybdenum Carbide ◽  
Co2 Hydrogenation ◽  
Cvd Synthesis ◽  
Supported Molybdenum Carbide

SnO2 nanocrystal-decorated mesoporous ZSM-5 as a precious metal-free electrode catalyst for methanol oxidation

2015 ◽  
Vol 8 (4) ◽  
pp. 1261-1266 ◽  
Author(s):  
Xiangzhi Cui ◽  
Yan Zhu ◽  
Zile Hua ◽  
Jingwei Feng ◽  
Ziwei Liu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Methanol Oxidation ◽  
Precious Metal ◽  
Metal Free ◽  
Catalytic Effects

The synergetic catalytic effects between the mesoporous ZSM-5 matrix and the loaded SnO2 nanocrystals endow the precious metal-free electrode catalyst SnO2/m-ZSM-5 nanocomposite with high and stable catalytic activity for methanol oxidation.

scholarly journals Noble-Metal-Free NixSy-C3N5 Hybrid Nanosheet with Highly Efficient Photocatalytic Performance

Catalysts ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1089
Author(s):  
Lixiao Han ◽  
Cong Peng ◽  
Jinming Huang ◽  
Linhao Sun ◽  
Shengyao Wang ◽  
...  
Keyword(s):  
Noble Metal ◽  
Active Sites ◽  
Photocatalytic Performance ◽  
Low Cost ◽  
H2 Production ◽  
Apparent Quantum Yield ◽  
Metal Free ◽  
Highly Efficient ◽  
Multifunctional Catalyst ◽  
Photocatalytic Applications

The construction of highly efficient, low-cost and noble-metal-free photocatalysts depends on photocatalytic technology. Recently, N-rich C3N5 has been explored as a novel carbon nitride material with a much narrower band gap (~2.2 eV) than that of traditional C3N4 (~2.7 eV). Planting noble-metal-free active sites on C3N5 to improve its photocatalytic activity is of great significance. Herein, 2D NixSy nanosheet is facially loaded on 2D C3N5 using a hydrothermal procedure under a low temperature. Due to the quick separation of photogenerated carries between C3N5 and NixSy, this inexpensive noble-metal-free NixSy-C3N5 hybrid nanosheet is highly efficient and stable as a multifunctional catalyst in various applications, including photocatalytic H2 production from water and NO removal. Impressively, the apparent quantum yield (AQY) value for H2 production reaches 37.0% (at 420 nm) on optimal NixSy-C3N5 hybrids, which is much higher than that of Pt-C3N5 material. This work opens an avenue to the fabrication of low-cost and noble-metal-free catalysts for multifunctional photocatalytic applications.

A cobalt–nitrogen complex on N-doped three-dimensional graphene framework as a highly efficient electrocatalyst for oxygen reduction reaction

Nanoscale ◽  
2014 ◽  
Vol 6 (24) ◽  
pp. 15066-15072 ◽  
Author(s):  
Yuanyuan Jiang ◽  
Yizhong Lu ◽  
Xiaodan Wang ◽  
Yu Bao ◽  
Wei Chen ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Precious Metal ◽  
High Performance ◽  
Raw Materials ◽  
Low Cost ◽  
Three Dimensional ◽  
Reduction Reaction ◽  
Highly Efficient ◽  
Doped Graphene

Effective preparation of a high-performance non-precious metal oxygen reduction electrocatalyst (a Co–N complex on 3D N-doped graphene) by a facile method from low-cost raw materials.

scholarly journals Influence of Transition Metal on the Hydrogen Evolution Reaction over Nano-Molybdenum-Carbide Catalyst

Catalysts ◽  
2018 ◽  
Vol 8 (7) ◽  
pp. 294 ◽  
Author(s):  
Meng Chen ◽  
Yufei Ma ◽  
Yanqiang Zhou ◽  
Changqing Liu ◽  
Yanlin Qin ◽  
...  
Keyword(s):  
Transition Metal ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Photoelectron Spectroscopy ◽  
Molybdenum Carbide ◽  
Low Cost ◽  
X Ray ◽  
Energy And Environment ◽  
Molybdenum Carbides ◽  
Metal Doped

The highly efficient electrochemical hydrogen evolution reaction (HER) provides a promising way to solve energy and environment problems. In this work, various transition metals (Fe, Co, Ni, Cu, Ag, and Pt) were selected to support on molybdenum carbides by a simple organic-inorganic precursor carburization process. X-ray diffraction (XRD) analysis results indicated that the β-Mo2C phase was formed in all metal-doped samples. X-ray photoelectron spectroscopy analysis indicated that the binding energy of Mo2+ species (Mo2C) shifted to a lower value after metal was doped on the molybdenum carbide surface. Comparing with pure β-Mo2C, the electrocatalytic activity for HER was improved by transition metal doping on the surface. Remarkably, the catalytic activity improvement was more obvious when Pt was doped on molybdenum carbide (2% Pt-Mo2C). The 2% Pt-Mo2C required a η10 of 79 mV, and outperformed that of pure β-Mo2C (η10 = 410 mV) and other transition metal doped molybdenum carbides, with a small Tafel slope (55 mV/dec) and a low onset overpotential (32 mV) in 0.5 M H2SO4. Also, the 2% Pt-Mo2C catalyst demonstrated a high stability for the HER in 0.5 M H2SO4. This work highlights a feasible strategy to explore efficient electrocatalysts with low cost via engineering on the composition and nanostructure.

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