The effect of magnetic force on hydrogen production efficiency in water electrolysis

2012 ◽  
Vol 37 (2) ◽  
pp. 1311-1320 ◽  
Author(s):  
Ming-Yuan Lin ◽  
Lih-Wu Hourng ◽  
Chan-Wei Kuo
Keyword(s):  
Hydrogen Production ◽  
Production Efficiency ◽  
Magnetic Force ◽  
Water Electrolysis

scholarly journals Experimental Study on Water Electrolysis Using Cellulose Nanofluid

Fluids ◽  
2020 ◽  
Vol 5 (4) ◽  
pp. 166
Author(s):  
Dongnyeok Choi ◽  
Kwon-Yeong Lee
Keyword(s):  
Energy Source ◽  
Experimental Study ◽  
Hydrogen Production ◽  
Production Efficiency ◽  
Initial Temperature ◽  
Water Electrolysis ◽  
Metal Corrosion ◽  
Hydrogen Energy ◽  
High Hydrogen ◽  
Long Period

Hydrogen energy is considered to be a future energy source due to its higher energy density as compared to renewable energy and ease of storage and transport. Water electrolysis is one of the most basic methods for producing hydrogen. KOH and NaOH, which are currently used as electrolytes for water electrolysis, have strong alkalinity. So, it cause metal corrosion and can be serious damage when it is exposed to human body. Hence, experiments using cellulose nanofluid (CNF, C6H10O5) as an electrolyte were carried out to overcome the disadvantages of existing electrolytes and increase the efficiency of hydrogen production. The variables of the experiment were CNF concentration, anode material, voltage applied to the electrode, and initial temperature of the electrolyte. The conditions showing the optimal hydrogen production efficiency (99.4%) within the set variables range were found. CNF, which is not corrosive and has high safety, can be used for electrolysis for a long period of time because it does not coagulate and settle over a long period of time unlike other inorganic nanofluids. In addition, it shows high hydrogen production efficiency. So, it is expected to be used as a next-generation water electrolysis electrolyte.

How to Advance the Hydrogen Production Efficiency by Adding Rare Earths in the Process of Eelectrolysis of Water?

2014 ◽  
Vol 672-674 ◽  
pp. 628-633
Author(s):  
Ju Chi Kuang
Keyword(s):  
Corrosion Resistance ◽  
Hydrogen Production ◽  
Rare Earths ◽  
Production Efficiency ◽  
Electron State ◽  
Positive Impact ◽  
Water Electrolysis ◽  
Clean Energy ◽  
Plating Bath ◽  
Electrolysis Process

Hydrogen is a kind of clean energy, and application is limited because the efficiency of hydrogen production was not high before. This work in the paper was to study how to advance the hydrogen production efficiency by adding rare earths in the process of electrolysis of water. The result of tests proved that the efficiency of hydrogen production of water electrolysis electrode is dramatically improved when a few of REs are added in plating bath, and La cations are more effective than Ce cations when being added in the plating bath. Besides that, this article illustrated positive impact of RE on process of plating as well as effect of RE on composition of the plating and corrosion resistance of surface of the coating. Furthermore, argumentation extended to it that RE alone and compound of La and Ce have affected on efficiency of hydrogen production by water electrolysis process. Finally the paper showed that a new mechanism had been presented in a new angle being established in effect of RE on electron state of Ni plating.

scholarly journals Adding the activated carbon of rice husk to increase hydrogen production on water electrolysis

2021 ◽  
Vol 1034 (1) ◽  
pp. 012075
Author(s):  
Purnami ◽  
ING. Wardana ◽  
Sudjito ◽  
Denny Widhiyanuriyawan ◽  
Nurkholis Hamidi
Keyword(s):  
Activated Carbon ◽  
Hydrogen Production ◽  
Rice Husk ◽  
Water Electrolysis

scholarly journals Hydrogen production from water electrolysis: role of catalysts

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Shan Wang ◽  
Aolin Lu ◽  
Chuan-Jian Zhong
Keyword(s):  
Hydrogen Production ◽  
Water Splitting ◽  
Noble Metal ◽  
Active Sites ◽  
Current Knowledge ◽  
Low Cost ◽  
Critical Role ◽  
Water Electrolysis ◽  
Efficient Production ◽  
Production Of Hydrogen

AbstractAs a promising substitute for fossil fuels, hydrogen has emerged as a clean and renewable energy. A key challenge is the efficient production of hydrogen to meet the commercial-scale demand of hydrogen. Water splitting electrolysis is a promising pathway to achieve the efficient hydrogen production in terms of energy conversion and storage in which catalysis or electrocatalysis plays a critical role. The development of active, stable, and low-cost catalysts or electrocatalysts is an essential prerequisite for achieving the desired electrocatalytic hydrogen production from water splitting for practical use, which constitutes the central focus of this review. It will start with an introduction of the water splitting performance evaluation of various electrocatalysts in terms of activity, stability, and efficiency. This will be followed by outlining current knowledge on the two half-cell reactions, hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), in terms of reaction mechanisms in alkaline and acidic media. Recent advances in the design and preparation of nanostructured noble-metal and non-noble metal-based electrocatalysts will be discussed. New strategies and insights in exploring the synergistic structure, morphology, composition, and active sites of the nanostructured electrocatalysts for increasing the electrocatalytic activity and stability in HER and OER will be highlighted. Finally, future challenges and perspectives in the design of active and robust electrocatalysts for HER and OER towards efficient production of hydrogen from water splitting electrolysis will also be outlined.

Physical-Chemical and Thermodynamic Analyses of Ethanol Steam Reforming for Hydrogen Production

2006 ◽  
Vol 3 (3) ◽  
pp. 346-350 ◽  
Author(s):  
Antonio Carlos Caetano de Souza ◽  
José Luz-Silveira ◽  
Maria Isabel Sosa
Keyword(s):  
Hydrogen Production ◽  
Steam Reforming ◽  
Production Efficiency ◽  
Physical Chemical ◽  
Steam Reforming Of Ethanol ◽  
Thermodynamic Conditions ◽  
High Production ◽  
Exergetic Analysis ◽  
Global Reaction ◽  
Technical Features

Steam reforming is the most usual method of hydrogen production due to its high production efficiency and technological maturity. The use of ethanol for this purpose is an interesting option because it is a renewable and environmentally friendly fuel. The objective of this article is to present the physical-chemical, thermodynamic, and exergetic analysis of a steam reformer of ethanol, in order to produce 0.7Nm3∕h of hydrogen as feedstock of a 1kW PEMFC. The global reaction of ethanol is considered. Superheated ethanol reacts with steam at high temperatures producing hydrogen and carbon dioxide, depending strongly on the thermodynamic conditions of reforming, as well as on the technical features of the reformer system and catalysts. The thermodynamic analysis shows the feasibility of this reaction in temperatures about 206°C. Below this temperature, the reaction trends to the reactants. The advance degree increases with temperature and decreases with pressure. Optimal temperatures range between 600 and 700°C. However, when the temperature attains 700°C, the reaction stability occurs, that is, the hydrogen production attains the limit. For temperatures above 700°C, the heat use is very high, involving high costs of production due to the higher volume of fuel or electricity used. The optimal pressure is 1atm., e.g., at atmospheric pressure. The exergetic analysis shows that the lower irreversibility is attained for lower pressures. However, the temperature changes do not affect significantly the irreversibilities. This analysis shows that the best thermodynamic conditions for steam reforming of ethanol are the same conditions suggested in the physical-chemical analysis.

Hydrogen Production From Water Electrolysis: Current Status and Future Trends

2012 ◽  
Vol 100 (2) ◽  
pp. 410-426 ◽  
Author(s):  
Alfredo Ursua ◽  
Luis M. Gandia ◽  
Pablo Sanchis
Keyword(s):  
Hydrogen Production ◽  
Water Electrolysis ◽  
Current Status ◽  
Future Trends
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