Tìm thấy 14+ kết quả cho từ khóa "Hydrogen Evolution"
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Transition-metal Doped Edge Sites in Vertically Aligned MoS2 Catalysts for Enhanced Hydrogen Evolution.. Defects Engineered Monolayer MoS2 for Improved Hydrogen Evolution Reaction. //doi.org/10.1021/acs.nanolett.5b04331.. Available from: https://doi.org/10.1016/j.electacta
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Trasatti S (1992) Electrocatalysis of hydrogen evolution: Progress in cathode activation. Wendt H and Plzak V (1990) Electrocatalysis and electrocatalysts for cathodic evolution and anodic oxidation of hydrogen. 48 Electrochemical Theory | Hydrogen Evolution
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Investigation of the catalytic performance of Pd/CNFs for hydrogen evolution from additive-free formic acid. doi: 10.3390/c4020026. Activity of Pd/C for hydrogen generation in aqueous formic acid solution.. Monodisperse gold-palladium alloy nanoparticles and their composition-controlled catalysis in formic acid dehydrogenation under mild conditions. doi: 10.1039/C2NR33637E 60. for the dehydrogenation of formic acid. 10.1002/anie.201300276.
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the positive plate is equal to that consumed by oxygen reduc- tion and hydrogen evolution at the negative plate.
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The reduction peak c 2 was unobservable due to the superimposed in hydrogen evolution (c 3. Comparison CV results of TiO 2 -Fe 2 O 3 /AB (Fig. 7) and TiO 2 -Fe 2 O 3 (Fig. 6) electrodes we can see clearly the positive effect of AB on the cycleability and cycle performance of TiO 2 -Fe 2 O 3 electrode..
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The concentration of protonated ligand on the surface also decreases owing to the electroreduction of these species with hydrogen evolution on the same level as water molecules..
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The photocatalytic degradation of dye molecules and hydrogen evolution reaction (HER) of the Ag/STO photocatalyst was higher than that of the pristine STO under both UV and visible light expo- sure.
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The rate of hydrogen evolution has an almost linear rise with the increase in PdS content in the photocatalyst. Thus the speed of hydrogen evolution increases by only 79% at an 8 times higher PdS concentration as shown in Figure 5b. Therefore, the speed limitative process in the hydrogen evolution reaction is not the recombination process but the density of the active centres for the reaction of hydronium ions reduction.
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It has been shown that it is primarily the hydrogen evolution at the negative electrode that becomes facilitated. The reason for this behaviour is that antimony has plated out on the negative electrode and allows hydrogen evolution to proceed more easily than on pure lead [6].
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As the current densities decrease, grain refinement is observed associated with the evolution of the (100) texture towards a less marked (110) texture, in good agreement with published results [22]. This behavior may support the postulate that the texture structure evolution of the transition metals is partly influenced by hydrogen evolution reaction (HER).
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E corr of mild steel shifted significantly to more positive values, mechanism of cathodic hydrogen evolution unchanges but mechanism of anodic dissolution changes.. Adsorption Isotherm. According to some researchers [3,4,5], the corrosion inhibition mechanism of inhibitors which derived from green plants are the adsorption mechanism.
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The stability limit of B1.3 V is given by the overvoltage for hydrogen evolution (about 0.2 V), and the overvoltage for oxygen evolution (B1.1 V). The open-circuit potentials of uncharged electrodes lie between 0.7 and 0.8 V (RHE, reversible hydrogen electrode).. The hydrogen electrode behaves more reversibly, although a portion of the positive electrode charge is consumed in faradaic processes.
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Figure 3 shows polarization curves for the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) on Pb-0.08% Ca-1.1% Sn alloys in 4.0 M H 2 SO 4 in the absence and presence of 0.4 M H 3 BO 3 . The Tafel slope for HER depends significantly on the alloy composition in the absence of H 3 BO V decade − 1 ) but it becomes higher and practically independent on the alloy type in the presence of H 3 BO V decade − 1.
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Table 1.3 contains the approximate exchange current density for the reduction of hydrogen ions on a range of materials. Note that the val- ue for the exchange current density of hydrogen evolution on platinum is approximately 10 2 A/cm 2 , whereas that on mercury is 10 13 A/cm 2. Exchange current density is usually expressed in terms of projected or geometric surface area and depends upon the surface roughness.
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Figure 1 Effect of solution pH on the potential–current curves for O 2 evolution. where the acid liberated during O 2 evolution can remain trapped because of the difficulty of mass transfer away from the reaction place.. Oxygen evolution is a reaction that dramatically affects the state of the electrode surface whereon it takes place.. As a rule, surface M–O bond strengths are higher than those of the O–O bond in an O 2 molecule.
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Lưu chứa hydrogen. hydrogen còn có thể lưu trữ được lâu dài. Về cơ bản có ba phương thức lưu trữ hydrogen như sau:. (i) Lưu chứa hydrogen trong các bình khí nén áp suất cao.. (ii) Lưu chứa hydrogen dưới dạng khí hóa lỏng.. Lưu chứa hydrogen dưới dạng khí nén. Hydrogen có thể được nén trong các bình chứa với áp suất cao. Các loại bình chứa khác nhau về cấu trúc tùy theo dạng ứng dụng đòi hỏi mức áp suất như thế nào. Phần lớn các bình ứng dụng tĩnh có mức áp suất thấp hơn.
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Pin nhiên liệu (sản xuất hydrogen). Sản xuất hydrogen. Phản ứng tổng hợp hạt nhân giữa các đồng vị của hydrogen, deuterium và tritium đã cung cấp nguồn năng lượng khổng lồ cho. Khác với các nguồn năng lượng cơ bản (ví dụ như dầu mỏ có thể bơm trực tiếp từ lòng đất lên rồi sử dụng), hydrogen là nguồn năng lượng thứ cấp, tức là chúng không thể được khai thác trực. tiếp mà phải được tạo ra từ một nguồn sơ cấp ban đầu.
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The full implementation of the hydrogen economy ne- cessarily requires that hydrogen should be largely avail- able, as a fuel or as an energy carrier, for a variety of applications close to the points of use. This evident benefit is however par- tially overcome by the considerable energy needed for the liquefaction of hydrogen, which is in excess of 30% of the energy content of hydrogen, and by the technological difficulties in handling liquid hydrogen..
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Hydrogen Fuel. HYDROGEN FUEL. Energy Today: Hydrogen Fuel. Hydrogen fuel / by Barbara J. What Is Hydrogen Fuel. CHAPTER 2: How Is Hydrogen Fuel Made? ...14. CHAPTER 3: Hydrogen Fuel Cells ...24. CHAPTER 4: Challenges in Using Hydrogen Fuel. CHAPTER 5: The Future of Hydrogen Fuel. 1 What Is Hydrogen Fuel?. Hydrogen fuel is one exciting possibility.. Hydrogen fuel is a material that is made of the element hydrogen. Liquid hydrogen fuel powers the rockets of the U.S.
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“Nền kinh tế hydro” là một hệ thống lưu trữ, phân phối và sử dụng năng lượng dựa trên. nhiên liệu chính hydrogen. Nền kinh tế hydrogen hứa hẹn đẩy lùi tất cả. những vấn đề do nền kinh tế dựa trên nhiên liệu hóa thạch đã gây ra.. Một cách tóm tắt, những lợi ích chính của nền kinh tế hydrogen là:. nước, hydrogen lại tái kết hợp với oxygen để tạo ra nước và cung cấp điện năng trong pin nhiên liệu..