A magnetron sputtered Mo3Si thin film: an efficient electrocatalyst for N2 reduction under ambient conditions

2021 ◽  
Author(s):  
Ting Wang ◽  
Qian Liu ◽  
Tingshuai Li ◽  
Siyu Lu ◽  
Guang Chen ◽  
...  
Keyword(s):  
Thin Film ◽  
Reversible Hydrogen Electrode ◽  
Ambient Conditions ◽  
Hydrogen Electrode

Mo3Si is a superior catalyst for electrochemical N2 reduction in 0.1 M Na2SO4, offering a large NH3 yield of 2 × 10−10 mol s−1 cm−2 and a high Faraday efficiency of 6.69% at −0.4 V and −0.3 V vs. a reversible hydrogen electrode, respectively.

scholarly journals The Synthesis of V2O3 Nanorings by Hydrothermal Process as an Efficient Electrocatalyst Toward N2 Fixation to NH3

2020 ◽  
Vol 8 ◽  
Author(s):  
Ning Wang ◽  
Qing-Song Song ◽  
Wen-Jing Liu ◽  
Jian Zhang
Keyword(s):  
Noble Metal ◽  
Hydrothermal Process ◽  
Maximum Yield ◽  
Reduction Reaction ◽  
Reversible Hydrogen Electrode ◽  
Proof Of Concept ◽  
Ambient Conditions ◽  
Hydrogen Electrode ◽  
Etching Mechanism ◽  
Template Free

A new ringlike V2O3 architecture was successfully synthesized by a template-free hydrothermal method, and the sulfur ions-assisted central-etching mechanism of the ringlike structure was proposed. Herein, as a proof-of-concept experiment, taking V2O3 nanorings as non-noble-metal-free nitrogen reduction reaction (NRR) catalysts, they show desired electrocatalytic performance toward NRR under ambient conditions (maximum yield: 47.2 µg h−1 mgcat.−1 at −0.6 V vs. reversible hydrogen electrode, maximum Faraday efficiency: 12.5% at −0.5 V vs. reversible hydrogen electrode), which is significantly higher than those of noble metal-based catalysts.

An ultrasmall Ru2P nanoparticles–reduced graphene oxide hybrid: an efficient electrocatalyst for NH3 synthesis under ambient conditions

2020 ◽  
Vol 8 (1) ◽  
pp. 77-81 ◽  
Author(s):  
Runbo Zhao ◽  
Chuangwei Liu ◽  
Xiaoxue Zhang ◽  
Xiaojuan Zhu ◽  
Peipei Wei ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Reversible Hydrogen Electrode ◽  
Ambient Conditions ◽  
Hydrogen Electrode ◽  
Faradaic Efficiency ◽  
Reduced Graphene

A Ru2P–reduced graphene oxide hybrid acts as a superior catalyst for electrochemical N2 fixation in 0.1 M HCl, achieving a large NH3 yield of 32.8 μg h−1mgcat.−1 and a high faradaic efficiency of 13.04%−0.05 V vs. the reversible hydrogen electrode.

Dendritic Cu: a high-efficiency electrocatalyst for N2 fixation to NH3 under ambient conditions

2019 ◽  
Vol 55 (96) ◽  
pp. 14474-14477 ◽  
Author(s):  
Chengbo Li ◽  
Shiyong Mou ◽  
Xiaojuan Zhu ◽  
Fengyi Wang ◽  
Yuting Wang ◽  
...  
Keyword(s):  
N2 Fixation ◽  
High Efficiency ◽  
Reversible Hydrogen Electrode ◽  
Ambient Conditions ◽  
Hydrogen Electrode ◽  
Faradaic Efficiency ◽  
Yield Rate

Dendritic Cu behaves as an efficient electrocatalyst for ambient N2-to-NH3 fixation with a high Faradaic efficiency of 15.12% and a large NH3 yield rate of 25.63 μg h−1 mgcat.−1 at −0.40 V versus reversible hydrogen electrode in 0.1 M HCl.

TiS2 nanosheets for efficient electrocatalytic N2 fixation to NH3 under ambient conditions

2019 ◽  
Vol 6 (8) ◽  
pp. 1986-1989 ◽  
Author(s):  
Kun Jia ◽  
Yuan Wang ◽  
Lang Qiu ◽  
Jiajia Gao ◽  
Qi Pan ◽  
...  
Keyword(s):  
N2 Fixation ◽  
Reversible Hydrogen Electrode ◽  
Ambient Conditions ◽  
Hydrogen Electrode ◽  
Faradaic Efficiency

TiS2 is efficient for electrochemical N2 fixation to NH3 in 0.1 M Na2SO4, achieving a faradaic efficiency of 5.50% with an NH3 yield of 16.02 μg h−1 mg−1cat at a potential of −0.6 V vs. reversible hydrogen electrode.

scholarly journals The amount of hydrogen and oxygen present on the surface of a metallic electrode

1929 ◽  
Vol 125 (798) ◽  
pp. 446-462 ◽  
Keyword(s):  
Linear Function ◽  
Linear Relation ◽  
Electrode Potential ◽  
Reversible Hydrogen Electrode ◽  
Acid Electrolyte ◽  
Hydrogen Electrode ◽  
Metallic Electrode ◽  
Mercury Surface ◽  
First Approximation ◽  
Accessible Area

In a pervious communication a study has been made of the potential changes which occur during the discharge of small quantities of electricity at metallic cathodes in an acid electrolyte. The electrode potential was, in general, more negative than the reversible hydrogen electrode, and it was found that over this range the potential change was a linear function of the quantity of electricity passed. This quantity was very small, 6 X 10 -7 coulombs per square centimetre causing a change of 100 millivolts in the electrode potential at a mercury surface. This linear relation was found on all the metals investigated, but the quantity varied with the nature and condition of the surface, being greater the rougher the surface. Experiments with amalgams, and platinised mercury surfaces showed that this quantity was, to a first approximation, accessible area of its surface. It was suggested that this change in potential may be regarded as due to the deposition of more hydrogen dipoles to the surface, or alternatively to a flux of electricity across the interface causing a further deformation of the hydrogen dipoles already present on the surface. Although the potential changes accompanying these additions to the surface have been studied, few measurements were made of the quantity of hydrogen initially present on the surface at the reversible hydrogen potential. It was considered probable that this was approximately a monatomic layer but it was of some interest to investigate this point.

scholarly journals Barrier Performance of CVD Graphene Films Using a Facile P3HT Thin Film Optical Transmission Test

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Srinivasa Kartik Nemani ◽  
Hossein Sojoudi
Keyword(s):  
Thin Film ◽  
Absorption Spectra ◽  
Optical Transmission ◽  
Screening Method ◽  
Ambient Conditions ◽  
Cvd Graphene ◽  
Barrier Materials ◽  
Graphene Films ◽  
Barrier Performance ◽  
Transmission Test

The barrier performance of CVD graphene films was determined using a poly(3-hexylthiophene) (P3HT) thin film optical transmission test. P3HT is a semiconducting polymer that photo-oxidatively degrades upon exposure to oxygen and light. The polymer is stable under ambient conditions and indoor lighting, enabling P3HT films to be deposited and encapsulated in air. P3HT’s stability under ambient conditions makes it desirable for an initial evaluation of barrier materials as a complimentary screening method in combination with conventional barrier tests. The P3HT test was used to demonstrate improved barrier performance for polymer substrates after addition of CVD graphene films. A layer-by-layer transfer method was utilized to enhance the barrier performance of monolayer graphene. Another set of absorption measurements were conducted to demonstrate the barrier performance of graphene and the degradation mechanism of graphene/P3HT over multiple wavelengths from 400 to 800 nm. The absorption spectra for graphene/polymer composite were simulated by solving Fresnel equations. The simulation results were found to be in good agreement with the measured absorption spectra. The P3HT degradation results qualitatively indicate the potential of graphene films as a possible candidate for medium performance barriers.

Co–Mo–Se ternary chalcogenide thin film coated p-Si photocathode for efficient solar hydrogen production

2020 ◽  
pp. 2151002
Author(s):  
Cihan Kuru
Keyword(s):  
Thin Film ◽  
Hydrogen Production ◽  
Photocurrent Density ◽  
Superior Performance ◽  
Great Promise ◽  
High Catalytic Activity ◽  
Hydrogen Electrode ◽  
Onset Potential ◽  
Ternary Chalcogenide ◽  
Chalcogenide Thin Film

Photoelectrochemical (PEC) water splitting holds a great promise for clean and sustainable hydrogen production. In this study, the PEC performance of Co–Mo–Se ternary chalcogenide thin film coated Si photocathodes is investigated. The Co–Mo–Se films with various Co/Mo atomic ratios were prepared by thermal selenization of sputter deposited Co–Mo alloy films. Among the photocathodes, the Co–Mo–Se (3:10)/[Formula: see text]-Si surpasses the PEC performance of the MoSe2/[Formula: see text]-Si with an onset potential of +124 mV vs. reversible hydrogen electrode (RHE), a photocurrent density of −22.68 mA/cm2 at zero overpotential and good stability over 6 h period of test. The superior performance of the Co–Mo–Se (3:10)/[Formula: see text]-Si is ascribed to the high catalytic activity of the film in hydrogen evolution reaction (HER) and efficient collection of photogenerated charge carriers. Such ternary chalcogenide thin films offer exciting opportunities for many applications in which the physicochemical properties can be tuned by changing the relative amount of the solute atoms.

scholarly journals A Pd/MnO2 Electrocatalyst for Nitrogen Reduction to Ammonia under Ambient Conditions

Catalysts ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 802
Author(s):  
Chang Sun ◽  
Yingxin Mu ◽  
Yuxin Wang
Keyword(s):  
High Performance ◽  
High Efficiency ◽  
Pd Nanoparticles ◽  
Ambient Conditions ◽  
X Ray Diffraction ◽  
Hydrogen Electrode ◽  
Faradaic Efficiency ◽  
Transmission Electron ◽  
Alternative Approach ◽  
Supported Pd

Electrochemical ammonia synthesis, which is an alternative approach to the Haber–Bosch process, has attracted the attention of researchers because of its advantages including mild working conditions, environmental protection, and simple process. However, the biggest problem in this field is the lack of high-performance catalysts. Here, we report high-efficiency electroreduction of N2 to NH3 on γ-MnO2-supported Pd nanoparticles (Pd/γ-MnO2) under ambient conditions, which exhibits excellent catalytic activity with an NH3 yield rate of 19.72 μg·mg−1Pd h−1 and a Faradaic efficiency of 8.4% at −0.05 V vs. the reversible hydrogen electrode (RHE). X-ray diffraction (XRD) and transmission electron microscopy (TEM) characterization shows that Pd nanoparticles are homogeneously dispersed on the γ-MnO2. Pd/γ-MnO2 outperforms other catalysts including Pd/C and γ-MnO2 because of its synergistic catalytic effect between Pd and Mn.

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