scholarly journals All‐Hydrocarbon MEA for PEM Water Electrolysis Combining Low Hydrogen Crossover and High Efficiency

2020 ◽  
Vol 10 (14) ◽  
pp. 1903995 ◽  
Author(s):  
Carolin Klose ◽  
Torben Saatkamp ◽  
Andreas Münchinger ◽  
Luca Bohn ◽  
Giorgi Titvinidze ◽  
...  
Keyword(s):  
High Efficiency ◽  
Water Electrolysis ◽  
Hydrogen Crossover

scholarly journals Water Electrolyzers: All‐Hydrocarbon MEA for PEM Water Electrolysis Combining Low Hydrogen Crossover and High Efficiency (Adv. Energy Mater. 14/2020)

2020 ◽  
Vol 10 (14) ◽  
pp. 2070061
Author(s):  
Carolin Klose ◽  
Torben Saatkamp ◽  
Andreas Münchinger ◽  
Luca Bohn ◽  
Giorgi Titvinidze ◽  
...  
Keyword(s):  
High Efficiency ◽  
Water Electrolysis ◽  
Hydrogen Crossover ◽  
Energy Mater

scholarly journals Synergistic Interfacial and Doping Engineering of Heterostructured NiCo(OH)x-CoyW as an Efficient Alkaline Hydrogen Evolution Electrocatalyst

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Ruopeng Li ◽  
Hao Xu ◽  
Peixia Yang ◽  
Dan Wang ◽  
Yun Li ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
High Efficiency ◽  
Low Voltage ◽  
Electrochemical Etching ◽  
Synergistic Effects ◽  
Release Kinetics ◽  
Water Electrolysis ◽  
Water Dissociation ◽  
Practical Applications ◽  
Environmentally Friendly Process

AbstractTo achieve high efficiency of water electrolysis to produce hydrogen (H2), developing non-noble metal-based catalysts with considerable performance have been considered as a crucial strategy, which is correlated with both the interphase properties and multi-metal synergistic effects. Herein, as a proof of concept, a delicate NiCo(OH)x-CoyW catalyst with a bush-like heterostructure was realized via gas-template-assisted electrodeposition, followed by an electrochemical etching-growth process, which ensured a high active area and fast gas release kinetics for a superior hydrogen evolution reaction, with an overpotential of 21 and 139 mV at 10 and 500 mA cm−2, respectively. Physical and electrochemical analyses demonstrated that the synergistic effect of the NiCo(OH)x/CoyW heterogeneous interface resulted in favorable electron redistribution and faster electron transfer efficiency. The amorphous NiCo(OH)x strengthened the water dissociation step, and metal phase of CoW provided sufficient sites for moderate H immediate adsorption/H2 desorption. In addition, NiCo(OH)x-CoyW exhibited desirable urea oxidation reaction activity for matching H2 generation with a low voltage of 1.51 V at 50 mA cm−2. More importantly, the synthesis and testing of the NiCo(OH)x-CoyW catalyst in this study were all solar-powered, suggesting a promising environmentally friendly process for practical applications.

scholarly journals The Effect of Cell Compression and Cathode Pressure on Hydrogen Crossover in PEM Water Electrolysis

2021 ◽  
Author(s):  
Agate Martin ◽  
Patrick Trinke ◽  
Markus Stähler ◽  
Andrea Stähler ◽  
Fabian Scheepers ◽  
...  
Keyword(s):  
Mass Transport ◽  
Cell Voltage ◽  
Water Electrolysis ◽  
Material Design ◽  
Operating Conditions ◽  
Cell Performance ◽  
Membrane Electrode ◽  
Current Densities ◽  
Hydrogen Crossover ◽  
The Impact

Abstract Hydrogen crossover poses a crucial issue for polymer electrolyte membrane (PEM) water electrolysers in terms of safe operation and efficiency losses, especially at increased hydrogen pressures. Besides the impact of external operating conditions, the structural properties of the materials also influence the mass transport within the cell. In this study, we provide an analysis of the effect of elevated cathode pressures (up to 15 bar) in addition to increased compression of the membrane electrode assembly on hydrogen crossover and the cell performance, using thin Nafion 212 membranes and current densities up to 3.6 A cm-2. It is shown that a higher compression leads to increased mass transport overpotentials, although the overall cell performance is improved due to the decreased ohmic losses. The mass transport limitations also become visible in enhanced anodic hydrogen contents with increasing compression at high current densities. Moreover, increases in cathode pressure are amplifying the compression effect on hydrogen crossover and mass transport losses. The results indicate that the cell voltage should not be the only criterion for optimizing the system design, but that the material design has to be considered for the reduction of hydrogen crossover in PEM water electrolysis.

Construction and Implementation of the Off-Grid Zero Emissions Building

2010 ◽  
Author(s):  
Justin Kramer ◽  
Brenton Greska ◽  
Anjaneyulu Krothapalli
Keyword(s):  
Natural Gas ◽  
Alternative Energy ◽  
High Efficiency ◽  
Water Electrolysis ◽  
Energy System ◽  
Proton Exchange ◽  
Hot Water ◽  
Environment Design ◽  
Energy And Environment ◽  
Office Space

This paper deals with the construction and implementation of the Off-Grid Zero Emissions Building (OGZEB), a project undertaken by the Energy Sustainability Center (ESC), formally the Sustainable Energy Science and Engineering Center (SESEC), at the Florida State University (FSU). The project involves the design, construction and operation of a completely solar-powered building that achieves LEED-NC (Leadership in Energy and Environment Design-New Construction) platinum certification. The 1064 square foot building is partitioned such that 800 square feet is a two bedroom, graduate student style flat with the remaining 264 square feet serving as office space. This arrangement allows the building to serve as an energy efficient model for campus designers in student living and office space. The building also serves as a prototype for developing and implementing cutting edge, alternative energy technologies in both residential and commercial settings. For example, hydrogen is used extensively in meeting the energy needs of the OGZEB. In lieu of high efficiency batteries, the excess electricity produced by the buildings photovoltaic (PV) panels is used to generate hydrogen via water electrolysis for long term energy storage. The hydrogen is stored on-site until needed for either generating electricity in a Proton Exchange Membrane (PEM) fuel cell stack or combusted in natural gas appliances that have been modified for hydrogen use. The use of hydrogen in modified natural gas appliances, such as an on-demand hot water heater and cook top, is unique to the OGZEB. This paper discusses the problems and solutions that arose during construction and includes detailed schematics of the OGZEBs energy system.

scholarly journals Stable Fe 2 P 2 S 6 Nanocrystal Catalyst for High‐Efficiency Water Electrolysis

Small Methods ◽  
2019 ◽  
Vol 4 (6) ◽  
pp. 1900632 ◽  
Author(s):  
Jinfa Chang ◽  
Guanzhi Wang ◽  
Anas Belharsa ◽  
Junjie Ge ◽  
Wei Xing ◽  
...  
Keyword(s):  
High Efficiency ◽  
Water Electrolysis

High efficiency water electrolysis in alkaline solution

1978 ◽  
Vol 3 (1) ◽  
pp. 21-37 ◽  
Author(s):  
A APPLEBY ◽  
G CREPY ◽  
J JACQUELIN
Keyword(s):  
Alkaline Solution ◽  
High Efficiency ◽  
Water Electrolysis

scholarly journals Surface of AISI 316 as Electrode Material for Water Electrolysis Under Potassium Hydroxide for Hybrid Car Application

2018 ◽  
Vol 15 (4) ◽  
pp. 5863-5873 ◽  
Author(s):  
Ida Hamidah ◽  
Agus Solehudin ◽  
Agus Setiawan ◽  
Lilik Hasanah ◽  
Budi Mulyanti ◽  
...  
Keyword(s):  
Electrode Material ◽  
Potassium Hydroxide ◽  
High Efficiency ◽  
Water Electrolysis ◽  
Solution Concentration ◽  
Hydrogen Gas ◽  
Hybrid Car ◽  
Exhaust Gas Emission ◽  
Aisi 316 ◽  
Electrolysis System

This study is to evaluate the surface of AISI 316 as an electrode material for water electrolysis under various potassium hydroxide (KOH) electrolyte concentrations. In the experimental method, AIS316 electrode and KOH solution put into the water electrolysis system. The electrolysis system was combined with the hybrid car engine system that consumed a combination of hydrogen and gasoline as the fuel source. KOH solution concentration was varied from 0 to 0.53M, which was then used to evaluate the surface of AISI 316 electrode as well as hybrid car performances. The experimental results showed that electrolyte solution concentration is an important parameter to maintain high-efficiency hydrogen generation. The more KOH added it gave benefits for creating the more hydrogen gas. However, it brought problems in the electrode surface corrosion. The optimum condition to get more hydrogen gas but with less corrosion damage was obtained when performing the process with 0.40 M of KOH. Indeed, the result also found that the more hydrogen gas being produced has a direct correlation to the reduction of fuel consumption and exhaust gas emission (e.g., CO2, CO, and NOx). 

Low electronegativity Mn bulk doping intensifies charge storage of Ni2P redox shuttle for membrane-free water electrolysis

2020 ◽  
Vol 8 (7) ◽  
pp. 4073-4082 ◽  
Author(s):  
Zichen Liu ◽  
Gong Zhang ◽  
Kai Zhang ◽  
Huachun Lan ◽  
Huijuan Liu ◽  
...  
Keyword(s):  
Energy Storage ◽  
Solid State ◽  
Water Splitting ◽  
High Efficiency ◽  
Free Water ◽  
Water Electrolysis ◽  
Electrochemical Energy Storage ◽  
Charge Storage ◽  
Areal Capacitance ◽  
Redox Shuttle

A high efficiency electrochemical energy storage and high areal capacitance solid-state mediator can act as an energy vector to solve the key problem in mixtures of H2 and O2 in electrically driven water splitting architectures.

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