Ni Inverse Opals for Water Electrolysis in an Alkaline Electrolyte

2010 ◽  
Vol 157 (3) ◽  
pp. P18 ◽  
Author(s):  
Yi-Jui Huang ◽  
Chun-Han Lai ◽  
Pu-Wei Wu ◽  
Li-Yin Chen
Keyword(s):  
Water Electrolysis ◽  
Alkaline Electrolyte ◽  
Inverse Opals

Polymeric composite diaphragms for water electrolysis with alkaline electrolyte

2016 ◽  
Vol 89 (4) ◽  
pp. 618-621 ◽  
Author(s):  
N. V. Kuleshov ◽  
V. N. Kuleshov ◽  
S. A. Dovbysh ◽  
E. Ya. Udris ◽  
S. A. Grigor’ev ◽  
...  
Keyword(s):  
Polymeric Composite ◽  
Water Electrolysis ◽  
Alkaline Electrolyte

CoS2–TiO2 hybrid nanostructures: efficient and durable bifunctional electrocatalysts for alkaline electrolyte membrane water electrolyzers

2018 ◽  
Vol 6 (3) ◽  
pp. 1075-1085 ◽  
Author(s):  
Pandian Ganesan ◽  
Arumugam Sivanantham ◽  
Sangaraju Shanmugam
Keyword(s):  
Water Electrolysis ◽  
Electrochemical Activity ◽  
Hybrid Nanostructures ◽  
Alkaline Electrolyte ◽  
Electrolyte Membrane ◽  
Bifunctional Electrocatalysts

The TiO2 supported Co(TU)-derived CoS2 nanostructures show remarkable bifunctional electrochemical activity and ultra-stability in alkaline electrolyte membrane water electrolysis.

Composite NiCoO2/NiCo2O4 inverse opals for the oxygen evolution reaction in an alkaline electrolyte

2020 ◽  
Vol 10 (22) ◽  
pp. 7566-7580
Author(s):  
Pei-Sung Hung ◽  
Wei-An Chung ◽  
Shih-Cheng Chou ◽  
Kuang-Chih Tso ◽  
Chung-Kai Chang ◽  
...  
Keyword(s):  
Mass Transport ◽  
Surface Area ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Alkaline Electrolyte ◽  
Functional Coating ◽  
Inverse Opals ◽  
Ordered Macroporous

The inverse opals exhibit a 3D ordered macroporous framework, which provides an excessive surface area and facile mass transport. A conformal NiCoOx functional coating further renders these materials with increased reactivity in OER catalysis.

scholarly journals Kinetic Reference Potential, pH-Effect, and Energy Recovery in Electrolysis of Water

2020 ◽  
Author(s):  
Tobias Binninger ◽  
Adrian Heinritz ◽  
Rhiyaad Mohamed
Keyword(s):  
High Pressure ◽  
Oxygen Evolution ◽  
Energy Recovery ◽  
Energy Content ◽  
Ph Effect ◽  
Cell Voltage ◽  
Water Electrolysis ◽  
Reference Voltage ◽  
Alkaline Electrolyte ◽  
Ph Effects

The electrolysis of water will likely become of superior importance for a sustainable energy economy. However, the electrocatalysis of electrochemical water splitting is complicated and the origin of significant energy losses. Among the heavily discussed open questions in this field at present is the origin of experimentally observed differences between electrolysis kinetics in acidic vs. alkaline electrolyte, and the effect of high-pressure operation on electrolyser performance. Our thermodynamic analysis reveals answers and fundamental connections between these questions by the definition of balanced reactive conditions and the kinetic reference voltage of the electrolysis reaction. Unlike the reversible cell voltage, the kinetic reference voltage <i>U</i><sub>kin</sub> is not biased by product H<sub>2</sub> and O<sub>2</sub> concentrations, and it represents a reliable intrinsic reference point for electrolysis kinetics. At standard temperature <i>T</i> = 25<sup>◦</sup>C, its value is <i>U</i><sub>kin</sub> = 1.441 V, which is in remarkable agreement with commonly observed onset voltages for macroscopic electrolysis rates. We define the reactive excess overvoltage <i>η</i><sub>rxs</sub> = <i>U</i><sub>kin</sub> − <i>U</i><sub>rev</sub> as the difference between the kinetic reference voltage and the reversible cell voltage. Comparing the hydrogen evolution (HER) and oxygen evolution (OER) half-cell reactions in acidic vs. alkaline electrolyte, we find an asymmetric and pH-dependent distribution of <i>η</i><sub>rxs</sub> among HER and OER. Increasing the electrolysis gas pressure results in a reduction of <i>η</i><sub>rxs</sub> due to an increased free energy content of the evolved gases. Our analysis provides a new perspective on activation losses in water electrolysis, on pH-effects in hydrogen and oxygen evolution electrocatalysis, and on high-pressure electrolysis as a means for energy recovery.<br>

scholarly journals Kinetic Reference Potential, pH-Effect, and Energy Recovery in Electrolysis of Water

2020 ◽  
Author(s):  
Tobias Binninger ◽  
Adrian Heinritz ◽  
Rhiyaad Mohamed
Keyword(s):  
High Pressure ◽  
Oxygen Evolution ◽  
Energy Recovery ◽  
Energy Content ◽  
Ph Effect ◽  
Cell Voltage ◽  
Water Electrolysis ◽  
Reference Voltage ◽  
Alkaline Electrolyte ◽  
Ph Effects

The electrolysis of water will likely become of superior importance for a sustainable energy economy. However, the electrocatalysis of electrochemical water splitting is complicated and the origin of significant energy losses. Among the heavily discussed open questions in this field at present is the origin of experimentally observed differences between electrolysis kinetics in acidic vs. alkaline electrolyte, and the effect of high-pressure operation on electrolyser performance. Our thermodynamic analysis reveals answers and fundamental connections between these questions by the definition of balanced reactive conditions and the kinetic reference voltage of the electrolysis reaction. Unlike the reversible cell voltage, the kinetic reference voltage <i>U</i><sub>kin</sub> is not biased by product H<sub>2</sub> and O<sub>2</sub> concentrations, and it represents a reliable intrinsic reference point for electrolysis kinetics. At standard temperature <i>T</i> = 25<sup>◦</sup>C, its value is <i>U</i><sub>kin</sub> = 1.441 V, which is in remarkable agreement with commonly observed onset voltages for macroscopic electrolysis rates. We define the reactive excess overvoltage <i>η</i><sub>rxs</sub> = <i>U</i><sub>kin</sub> − <i>U</i><sub>rev</sub> as the difference between the kinetic reference voltage and the reversible cell voltage. Comparing the hydrogen evolution (HER) and oxygen evolution (OER) half-cell reactions in acidic vs. alkaline electrolyte, we find an asymmetric and pH-dependent distribution of <i>η</i><sub>rxs</sub> among HER and OER. Increasing the electrolysis gas pressure results in a reduction of <i>η</i><sub>rxs</sub> due to an increased free energy content of the evolved gases. Our analysis provides a new perspective on activation losses in water electrolysis, on pH-effects in hydrogen and oxygen evolution electrocatalysis, and on high-pressure electrolysis as a means for energy recovery.<br>

scholarly journals Inexpensive electrochemical synthesis of nickel iron sulphides on nickel foam: super active and ultra-durable electrocatalysts for alkaline electrolyte membrane water electrolysis

2016 ◽  
Vol 4 (42) ◽  
pp. 16394-16402 ◽  
Author(s):  
Pandian Ganesan ◽  
Arumugam Sivanantham ◽  
Sangaraju Shanmugam
Keyword(s):  
Electrochemical Synthesis ◽  
Nickel Foam ◽  
Current Collector ◽  
Water Electrolysis ◽  
Alkaline Electrolyte ◽  
Nickel Iron ◽  
Electrolyte Membrane ◽  
Iron Sulphides ◽  
Alkaline Membrane

The inexpensive fabrication of nano-honeycomb structured nickel iron sulphides on a nickel foam current collector is described and used as both anode and cathode in the alkaline membrane water electrolysis.

Alkaline Electrolysis at Sea for Green Hydrogen Production: A Solution to Electrolyte Deterioration

2018 ◽  
Author(s):  
Rafael d’Amore-Domenech ◽  
Emilio Navarro ◽  
Eleuterio Mora ◽  
Teresa J. Leo
Keyword(s):  
Hydrogen Production ◽  
High Efficiency ◽  
Water Electrolysis ◽  
Alkaline Electrolyte ◽  
Alkaline Water Electrolysis ◽  
Logistic Problem ◽  
Combined Solution ◽  
Electrolysis Method ◽  
Novel Method ◽  
Alkaline Electrolysis

This article illustrates a novel method to produce hydrogen at sea with no carbon footprint, based on alkaline electrolysis, which is the cheapest electrolysis method for in-land hydrogen production, coupled to offshore renewable farms. The novelty of the method presented in this work is the solution to cope with the logistic problem of periodical renewal of the alkaline electrolyte, considered problematic in an offshore context. Such solution consists in the integration of a small chlor-alkali plant to produce new electrolyte in situ. This article describes a proposal to combine alkaline water electrolysis and chlor-alkali processes, first considering both in a separate manner, and then describing and discussing the combined solution, which seeks high efficiency and sustainability.

DEVELOPMENT OF A SATELLITE PROPULSION SYSTEM BASED ON WATER ELECTROLYSIS

2019 ◽  
Vol 18 (3) ◽  
pp. 185-199
Author(s):  
Nicholas-E. Harmansa ◽  
Georg Herdrich ◽  
Stefanos Fasoulas ◽  
Ulrich Gotzig
Keyword(s):  
Water Electrolysis ◽  
Propulsion System

Modelling and control of an alkaline water electrolysis process

2018 ◽  
Vol 1 (2) ◽  
pp. 9-14
Author(s):  
Marisol Cervantes-Bobadilla ◽  
Ricardo Fabricio Escobar Jiménez ◽  
José Francisco Gómez Aguilar ◽  
Tomas Emmanuel Higareda Pliego ◽  
Alberto Armando Alvares Gallegos
Keyword(s):  
Process Model ◽  
Water Electrolysis ◽  
Alkaline Water Electrolysis ◽  
Alkaline Water ◽  
Electrolysis Process ◽  
Linear Dynamic ◽  
Energy Current ◽  
Identification Technique ◽  
Nonlinear Static ◽  
And Control

In this research, an alkaline water electrolysis process is modelled. The electrochemical electrolysis is carried out in an electrolyzer composed of 12 series-connected steel cells with a solution 30% wt of potassium hydroxide. The electrolysis process model was developed using a nonlinear identification technique based on the Hammerstein structure. This structure consists of a nonlinear static block and a linear dynamic block. In this work, the nonlinear static function is modelled by a polynomial approximation equation, and the linear dynamic is modelled using the ARX structure. To control the current feed to the electrolyzer an unconstraint predictive controller was implemented, once the unconstrained MPC was simulated, some restrictions are proposed to design a constrained MPC (CMPC). The CMPC aim is to reduce the electrolyzer's energy consumption (power supply current). Simulation results showed the advantages of using the CMPC since the energy (current) overshoots are avoided.

Sign in / Sign up

Export Citation Format

Share Document