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PubMed Journals Articles About "Electrolyte Effects Stability Cathodes Hydrogen Evolution Reaction" RSS

15:26 EDT 16th June 2019 | BioPortfolio

Electrolyte Effects Stability Cathodes Hydrogen Evolution Reaction PubMed articles on BioPortfolio. Our PubMed references draw on over 21 million records from the medical literature. Here you can see the latest Electrolyte Effects Stability Cathodes Hydrogen Evolution Reaction articles that have been published worldwide.

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Showing "Electrolyte Effects Stability Cathodes Hydrogen Evolution Reaction" PubMed Articles 1–25 of 38,000+

Electrolyte Effects on the Stability of Ni-Mo Cathodes for the Hydrogen Evolution Reaction.

Water electrolysis to form hydrogen as a solar fuel requires its catalysts to be highly effective. Ni-Mo is known as such a material. In this work, we perform theoretical and experimental studies on the activity and stability of Ni-Mo cathodes. Density functional theory studies show various Ni-Mo facets to be active for the hydrogen evolution reaction, Ni segregation to be thermodynamically favorable, and Mo vacancy formation to be favorable even without an applied potential. Electrolyte effects on the long...


High-performance hydrogen evolution reaction catalysis achieved by small core-shell copper nanoparticles.

In this work, we reported a comprehensive first-principles study on the hydrogen evolution reaction (HER) catalytic activity of Cu based core-shell nanoparticles (CSNPs). Cu nanoparticle (NP) and M@Cu CSNPs (x = 1, 13) with Fe, Ru, and Os as core components were constructed and their structural parameters, stability, and electronic properties were calculated. We found that there exist competing effects during the binding of H atom on the NP surface. The competing effects between the decreasing of negati...

Amorphous phosphorus-doped MoS2 catalyst for efficient hydrogen evolution reaction.

Water splitting is an important method for producing clean and sustainable hydrogen to replace finite fossil fuels in future energy systems. MoS2 is reported as a promising catalyst without noble metallic element to accelerate electrocatalytic hydrogen evolution reaction (HER) rate. While, the further improvement of the MoS2-based catalyst is still strongly demanded to meet the real needs. In the present study, a novel amorphous phosphorus-doped MoS2 (P-MoS2) nanocomposite is prepared by a facile hydrotherm...


Sequential Engineering of Ternary CuFeNi with a Vertically Layered Structure for Efficient and Bifunctional Catalysis of the Oxygen and Hydrogen Evolution Reactions.

Developing efficient and earth-abundant electrocatalysts for electrochemical water splitting is greatly desired due to growing energy demands. Herein, we develop a promising hierarchical nickel-iron-copper nitride electrode that is fabricated via a three-step process, starting with a hydrothermal synthesis of nickel-iron hydroxide on nickel foam and followed by the direct growth of copper metal-organic frameworks and, finally, low temperature ammonization. This approach yields a material that is an efficien...

Twinned Tungsten Carbonitride Nanocrystals Boost Hydrogen Evolution Activity and Stability.

Synergistic integration of two active metal-based compounds can lead to much higher electrocatalytic activity than either of the two individually, due to the interfacial effects. Herein, a proof-of-concept strategy is creatively developed for the successful fabrication of twinned tungsten carbonitride (WCN) nanocrystals, where W C and WN are chemically bonded at the molecule level. High-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) and X-ray absorption fine structure (XAFS)...

Tunable engineering hollow carbon nanomaterial served as an excellent catalyst for oxygen reduction reaction and hydrogen evolution reaction.

Fe and N functionalized hollow carbon spheres (Fe/N-HCS) with hierarchically porous structure are constructed. Remarkably, it is discovered that the pyrolysis temperature effects the chemical composition intensively. At 800 °C, only graphitic-N and oxidized-N are formed for all as-prepared samples. The surface area and pores can be precisely tuned, the surface area of all Fe/N-HCS samples is more than 500  m g benefiting from the porous hollow structure. Thus, the optimized Fe/N-HCS exhibits excell...

Unusual synergistic effect in layered Ruddlesden-Popper oxide enables ultrafast hydrogen evolution.

Efficient electrocatalysts for hydrogen evolution reaction are key to realize clean hydrogen production through water splitting. As an important family of functional materials, transition metal oxides are generally believed inactive towards hydrogen evolution reaction, although many of them show high activity for oxygen evolution reaction. Here we report the remarkable electrocatalytic activity for hydrogen evolution reaction of a layered metal oxide, Ruddlesden-Popper-type SrRuO with alternative perovskite...

A New Simultaneous Exfoliation and Doping Process for Generating MX2 Nanosheets for Electrocatalytic Hydrogen Evolution Reaction.

Doping nonmetal atoms into layered MX2 structures has emerged as a promising strategy for enhancing their catalytic activities for hydrogen evolution reaction. In this study, a new and efficient one-step approach that involves simultaneous plasma-induced doping and exfoliating of transition metal dichalcogenides MX2-such as MoSe2, WSe2, MoS2 and WS2 nanosheets-within a short time and at a low temperature (ca. 80 °C) has been developed. Particularly, an active plasma zone can be generated at the submerged c...

New Chemical Insights into the Beneficial Role of AlO Cathode Coatings in Lithium-ion Cells.

Inorganic surface coatings, such as AlO, are commonly applied on positive electrode materials to improve the cycling stability and lifetime of lithium-ion cells. The beneficial effects are typically attributed to the chemical scavenging of corrosive HF and the physical blockage of electrolyte components from reaching the electrode surface. The present work combines published thermochemistry data with new density functional theory calculations to propose a new mechanism of action: the spontaneous reaction of...

3D hierarchical CoO@CoS nanoarrays as anode and cathode materials for oxygen evolution reaction and hydrogen evolution reaction.

With the increasing energy demand and environmental pollution, hydrogen production by water splitting is one of the best ways to solve the energy shortage. Three-dimensional (3D) hierarchical Co3O4@Co3S4/NF was first synthesized directly in situ, grown on the nickel foam through a simple hydrothermal process, and the anion-exchange reaction and the Ostwald ripening mechanism were investigated by adjusting the reaction time. The oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) activities...

Topological formation of Mo-Ni based hollow structure as a highly efficient electrocatalyst for hydrogen evolution reaction in alkaline solution.

Mo-Ni alloy has been demonstrated to be a benchmark noble-metal-free catalyst for hydrogen evolution reaction (HER) in alkaline solutions. Nevertheless, further improvement on its catalytic activity is desired to meet industrial requirements. In this study, Mo-Ni based hollow structures (MoNi-HS), backboned by MoO3-x nanosheets and decorated with metallic MoNi4 nanoparticles, was obtained via a topological transformation process by annealing MoNi-oxide hollow precursors in a reducing atmosphere. This hollow...

One-pot aqueous synthesis of two-dimensional porous bimetallic PtPd alloyed nanosheets as highly active and durable electrocatalyst for boosting oxygen reduction and hydrogen evolution.

Recently, two-dimensional materials have gained increasing research attention due to their large surface area, high physical and chemical stability, and excellent electrocatalytic performances. Herein, we reported a simple and fast one-pot aqueous method for synthesis of two-dimensional porous bimetallic PtPd alloyed nanosheets (NSs) using benzyldimethylhexadecylammonium chloride (HDBAC) as the capping agent and stabilizer. The formation mechanism involved the oriented attachment and self-assembly. The PtPd...

Ternary Os-Ag-Si electrocatalysts for hydrogen evolution are more efficient than Os-Au-Si.

Hydrogen is considered as a promising energy source because of its high combustion heat and clean products. Among the various hydrogen evolution methods, electrocatalysis is the most convenient and effective way. However it is still problematic to find low-cost and high-efficiency electrocatalysts. In this work, Os-Ag-Si and Os-Au-Si ternary electrocatalysts were investigated. It is interesting that Os-Ag-Si exhibits higher hydrogen evolution performance than that of Os-Au-Si, even though Ag is a worse HER ...

Heterostructures Comprised of Co/β-Mo2C-Encapsulated N-Doped Carbon Nanotubes as Bifunctional Electrodes for Water Splitting.

Herein, we demonstrate heterostructures comprised of Co/β-Mo2C@N-CNTs hybrids for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline electrolyte. The Co can not only create well-defined heterointerface with β-Mo2C but also overcome the poor OER activity of β-Mo2C, leading to enhanced electrocatalytic activity for HER and OER. DFT calculations further prove that by cooperating the N-CNTs, Co, and β-Mo2C results in lower the energy barriers of intermediates, thus greatly...

A "Superaerophobic" Nickel Phosphide Nanoarray Catalyst for Efficient Hydrogen Evolution at Ultra-High Current Densities.

The design of highly efficient non-noble metal electrocatalysts for large-scale hydrogen production remains an ongoing challenge. We report here a Ni2P nanoarray catalyst grown on a commercial Ni foam substrate, which demonstrates an outstanding electrocatalytic activity and stability in basic electrolyte. The high catalytic activity can be attributed to the favorable electron transfer, superior intrinsic activity and the intimate connection between the nanoarrays and their substrate. Moreover, the unique "...

Reaction packaging CoSe2 nanoparticles in N-doped carbon polyhedra with bifunctionality for overall water splitting.

Water electrolysis is a promising approach for green and large-scale hydrogen production; however, there are still challenges for developing efficient and stable bi-functional electrocatalysts towards the hydrogen and oxygen evolution reactions. Herein, zeolitic imidazolate framework-67 (ZIF67) was used as the precursor for the construction of CoSe2 nanoparticles trapped in N-doped carbon polyhedra (NC). Among as-obtained CoSe2-NC hybrid, highly active CoSe2 nanoparticles in sizes of 10-20 nm are encapsulat...

Enhanced Electrocatalytic Activity of Trace Pt in Ternary CuCoPt Alloy Nanoparticles for Hydrogen Evolution.

We report an enhanced high electrocatalytic hydrogen evolution activity of trace Pt and Co diluted in ternary CuCoPt alloy nanoparticles with Cu as the substrate. Using only 10% Pt atoms can display even better activity and stability in hydrogen evolution reactions than using pure Pt nanoparticles.

Tailored synthesis of Zn-N co-doped porous MoC nanosheets towards efficient hydrogen evolution.

Developing non-precious metal catalysts with both high efficiency and long-term stability is the top priority for hydrogen evolution reactions (HER). Herein, we present a facile two-step method to synthesize Zn, N co-doped molybdenum carbide nanosheets (Zn-N-MoC-H NSs) by using bi-metal oxides of ZnMoO4 as a unique precursor. Zn not only serves as a template to form a porous structure on MoC nanosheets during volatilizing at high temperatures, but also acts as a doping source for Zn doping in MoC. The N-con...

Potential-driven surface active structure rearrangement over FeP@NC towards efficient electrocatalytic hydrogen evolution.

Understanding the variation of active structure during the hydrogen evolution reaction (HER) process is of great importance for aiding in the design of optimized electrocatalysts. Herein, we present a composite material of FeP nanoparticles coated by N-doped carbon (FeP@NC) as an efficient HER electrocatalyst, synthesized by a pyrolysis and equivalent-volume impregnation method. The as-prepared FeP@NC catalyst can accelerate the HER at a small overpotential of 135 mV with a current density of 10 mA cm-2 in ...

Doping Effects on the Performance of Paired Metal Catalysts for the Hydrogen Evolution Reaction.

Metal heteroatoms dispersed in nitrogen-doped graphene display promising catalytic activity for fuel cell reactions such as the hydrogen evolution reaction (HER). Here we explore the effects of dopant concentration on the synergistic catalytic behaviour of a paired metal atom active site comprised of Co and Pt atoms that have been shown to be particularly active catalysts in these materials. The metals are coordinated to six atoms in a vacancy of N-doped graphene. We find that HER activity is enhanced with ...

MoC-Ni modified carbon microfibers as an effective electrocatalyst for hydrogen evolution reaction in acidic solution.

In this work, carbon microfibers modified with MoC and metallic Ni (MoC-Ni-CMF0.2) was successfully synthesized by one-step strategy and demonstrated that it is efficient and stable low-cost electrocatalyst for hydrogen evolution reaction (HER) in acidic conditions. The as-obtained MoC-Ni-CMF0.2 shows excellent HER activity with a low overpotential (131 mV) to reach current density of 10 mA cm, a small Tafel plot (34.1 mV dec) and remarkable stability. The carbonized cotton fibers has a pore struc...

Seleno-analogues of pentlandites (FeNiSSe, Y = 1-6): tuning bulk Fe/Ni sulphoselenides for hydrogen evolution.

We herein present a series of hitherto unprecedented seleno-pentlandites (Fe4.5Ni4.5S8-YSeY). By analysing the influence of S/Se exchange on the catalyst structure and activity in the electrochemical hydrogen evolution reaction we herein showcase the potential and limitations of homologous S/Se exchanges within pentlandite HER catalysts.

Catalytic Reactivation of Industrial Oxygen Depolarized Cathodes by in-situ Generation of Atomic Hydrogen.

Electrocatalytically active materials on the industrial as well as on the laboratory scale may suffer from chemical instability during operation, air exposure or storage in the electrolyte. We present a strategy to recover electrocatalytic activity losses. We employ oxygen depolarized cathodes (ODC), analogous to those which are utilized in industrial brine electrolysis and we found that the catalytic activity of the electrodes diminishes upon storage (4 weeks) under industrial process conditions (30 wt% Na...

P doped MoS nanoplates embedded in nitrogen doped carbon nanofibers as an efficient catalyst for hydrogen evolution reaction.

Two-dimensional (2D) molybdenum sulfide (MoS) is considered as a promising catalyst for hydrogen evolution reaction (HER), originated from its abundant hydrogen evolution active sites. However, the HER performance of MoS is currently hindered by the limited exposed density of the active sites and low conductivity. Herein, we report a facile and scalable electrospinning technique to fabricate 2D MoS nanoplates doped with phosphorus within one-dimensional nitrogen doped-carbon nanofibers (NCNFs-MoS|P) as a hi...

An Efficient Cobalt Phosphide Electrocatalyst Derived from Cobalt Phosphonate Complex for All-pH Hydrogen Evolution Reaction and Overall Water Splitting in Alkaline Solution.

The development of low-cost and highly efficient electrocatalysts via an eco-friendly synthetic method is of great significance for future renewable energy storage and conversion systems. Herein, cobalt phosphides confined in porous P-doped carbon materials (Co-P@PC) are fabricated by calcinating the cobalt-phosphonate complex formed between 1-hydroxyethylidenediphosphonic acid and Co(NO ) in alkaline solution. The P-containing ligand in the complex acts as the carbon source as well as in situ phosphorizing...


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