Noble-Metal-Free MOF-74-Derived Nanocarbons: Insights on Metal Composition and Doping Effects on the Electrocatalytic Activity Toward Oxygen Reactions

2019 ◽  
Vol 2 (3) ◽  
pp. 1854-1867 ◽  
Author(s):  
Víctor K. Abdelkader-Fernández ◽  
Diana M. Fernandes ◽  
Salete S. Balula ◽  
Luís Cunha-Silva ◽  
Manuel José Pérez-Mendoza ◽  
...  
Keyword(s):  
Noble Metal ◽  
Electrocatalytic Activity ◽  
Metal Free ◽  
Doping Effects ◽  
Metal Composition

scholarly journals Electrocatalytic hydrogen evolution on the noble metal-free MoS2/carbon nanotube heterostructure: a theoretical study

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Farhad Keivanimehr ◽  
Sajjad Habibzadeh ◽  
Alireza Baghban ◽  
Amin Esmaeili ◽  
Ahmad Mohaddespour ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Noble Metal ◽  
Electrocatalytic Activity ◽  
Density Functional ◽  
Minimum Energy ◽  
Chemical Properties ◽  
Binding Energies ◽  
Functional Theory ◽  
Metal Free ◽  
Physico Chemical

AbstractMolybdenum disulfide (MoS2) is considered as a promising noble-metal-free electrocatalyst for the Hydrogen Evolution Reaction (HER). However, to effectively employ such material in the HER process, the corresponding electrocatalytic activity should be comparable or even higher than that of Pt-based materials. Thus, efforts in structural design of MoS2 electrocatalyst should be taken to enhance the respective physico-chemical properties, particularly, the electronic properties. Indeed, no report has yet appeared about the possibility of an HER electrocatalytic association between the MoS2 and carbon nanotubes (CNT). Hence, this paper investigates the synergistic electrocatalytic activity of MoS2/ CNT heterostructure for HER by Density Functional Theory simulations. The characteristics of the heterostructure, including density of states, binding energies, charge transfer, bandgap structure and minimum-energy path for the HER process were discussed. It was found that regardless of its configuration, CNT is bound to MoS2 with an atomic interlayer gap of 3.37 Å and binding energy of 0.467 eV per carbon atom, suggesting a weak interaction between CNT and MoS2. In addition, the energy barrier of HER process was calculated lower in MoS2/CNT, 0.024 eV, than in the MoS2 monolayer, 0.067 eV. Thus, the study elaborately predicts that the proposed heterostructure improves the intrinsic electrocatalytic activity of MoS2.

Pomelo peel-derived, N-doped biochar microspheres as an efficient and durable metal-free ORR catalyst in microbial fuel cells

2020 ◽  
Vol 4 (4) ◽  
pp. 1642-1653 ◽  
Author(s):  
Yuyuan Zhang ◽  
Lifang Deng ◽  
Huawen Hu ◽  
Yu Qiao ◽  
Haoran Yuan ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Noble Metal ◽  
Electrocatalytic Activity ◽  
Microbial Fuel Cells ◽  
Free Carbon ◽  
Metal Free ◽  
Pomelo Peel ◽  
Carbon Based

Naturally abundant pomelo peels were explored for the preparation of the metal-free carbon-based microspheres with high electrocatalytic activity and long-term durability toward ORR, holding potential for replacing noble metal-based catalysts.

Unconventional molybdenum carbide phases with high electrocatalytic activity for hydrogen evolution reaction

2019 ◽  
Vol 7 (30) ◽  
pp. 18030-18038 ◽  
Author(s):  
Chaoyun Tang ◽  
Hui Zhang ◽  
Kuofeng Xu ◽  
Qianling Zhang ◽  
Jianhong Liu ◽  
...  
Keyword(s):  
Renewable Energy ◽  
Hydrogen Evolution ◽  
Noble Metal ◽  
Hydrogen Evolution Reaction ◽  
Electrocatalytic Activity ◽  
Noble Metals ◽  
Molybdenum Carbide ◽  
Energy Devices ◽  
Metal Free ◽  
Carbide Phases

The development of noble metal-free catalysts, which can replace noble metals for various electrocatalytic reactions in renewable energy devices is of huge interest. Here, we report nanoporous α-MoC1−x and η-MoC nanosheets electrocatalysts for HER.

Interface engineering of the Ni(OH)2–Ni3N nanoarray heterostructure for the alkaline hydrogen evolution reaction

2018 ◽  
Vol 6 (3) ◽  
pp. 833-836 ◽  
Author(s):  
Min Gao ◽  
Lanlan Chen ◽  
Zhenhua Zhang ◽  
Xuping Sun ◽  
Shusheng Zhang
Keyword(s):  
Hydrogen Evolution ◽  
Noble Metal ◽  
Hydrogen Evolution Reaction ◽  
Electrocatalytic Activity ◽  
Alkaline Media ◽  
Interface Engineering ◽  
Metal Free

It is highly attractive but challenging to design and develop noble-metal-free catalysts with outstanding electrocatalytic activity for the hydrogen evolution reaction (HER) in alkaline media.

A hybrid of titanium nitride and nitrogen-doped amorphous carbon supported on SiC as a noble metal-free electrocatalyst for oxygen reduction reaction

2015 ◽  
Vol 51 (13) ◽  
pp. 2625-2628 ◽  
Author(s):  
Yingdan Jia ◽  
Yanhui Wang ◽  
Liang Dong ◽  
Junjie Huang ◽  
Yan Zhang ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Titanium Nitride ◽  
Oxygen Reduction ◽  
Noble Metal ◽  
Amorphous Carbon ◽  
Electrocatalytic Activity ◽  
Reduction Reaction ◽  
Oxygen Reduction Reactions ◽  
Nitrogen Doped ◽  
Metal Free

The NC–TiN/SiC electrocatalyst exhibits excellent electrocatalytic activity toward oxygen reduction reactions, outstanding stability and strong methanol resistance.

P-Type Cobalt Phosphide Composites (CoP–Co2P) Decorated on Titanium Oxide for Enhanced Noble-Metal-Free Photocatalytic H2 Evolution Activity

Langmuir ◽  
2021 ◽  
Vol 37 (11) ◽  
pp. 3321-3330
Author(s):  
Rong Liang ◽  
Yanwen Wang ◽  
Chao Qin ◽  
Xuehua Chen ◽  
Zhizhen Ye ◽  
...  
Keyword(s):  
Titanium Oxide ◽  
Noble Metal ◽  
H2 Evolution ◽  
Metal Free ◽  
Cobalt Phosphide ◽  
P Type ◽  
Photocatalytic H2 Evolution

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.

scholarly journals Double Perovskite Cobaltites Integrated in a Monolithic and Noble Metal-Free Photoelectrochemical Device for Efficient Water Splitting

2021 ◽  
Author(s):  
Junjie Zhu ◽  
Jónína B. Guđmundsdóttir ◽  
Ragnar Strandbakke ◽  
Kevin G. Both ◽  
Thomas Aarholt ◽  
...  
Keyword(s):  
Water Splitting ◽  
Noble Metal ◽  
Double Perovskite ◽  
Metal Free

Noble-metal-free dye-sensitized selective oxidation of methane to methanol with green light (550 nm)

Nano Research ◽  
2021 ◽  
Author(s):  
Xingyang Wu ◽  
Yi Zeng ◽  
Hangchen Liu ◽  
Jiaqing Zhao ◽  
Tierui Zhang ◽  
...  
Keyword(s):  
Selective Oxidation ◽  
Noble Metal ◽  
Green Light ◽  
Metal Free ◽  
Dye Sensitized ◽  
Oxidation Of Methane
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