scholarly journals Solar-driven, highly sustained splitting of seawater into hydrogen and oxygen fuels

2019 ◽  
Vol 116 (14) ◽  
pp. 6624-6629 ◽  
Author(s):  
Yun Kuang ◽  
Michael J. Kenney ◽  
Yongtao Meng ◽  
Wei-Hsuan Hung ◽  
Yijin Liu ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Water Oxidation ◽  
Iron Hydroxide ◽  
Nickel Iron ◽  
Chloride Corrosion ◽  
Current Densities ◽  
Superior Corrosion Resistance ◽  
Multilayer Anode ◽  
Renewable Energy Storage

Electrolysis of water to generate hydrogen fuel is an attractive renewable energy storage technology. However, grid-scale freshwater electrolysis would put a heavy strain on vital water resources. Developing cheap electrocatalysts and electrodes that can sustain seawater splitting without chloride corrosion could address the water scarcity issue. Here we present a multilayer anode consisting of a nickel–iron hydroxide (NiFe) electrocatalyst layer uniformly coated on a nickel sulfide (NiSx) layer formed on porous Ni foam (NiFe/NiSx-Ni), affording superior catalytic activity and corrosion resistance in solar-driven alkaline seawater electrolysis operating at industrially required current densities (0.4 to 1 A/cm2) over 1,000 h. A continuous, highly oxygen evolution reaction-active NiFe electrocatalyst layer drawing anodic currents toward water oxidation and an in situ-generated polyatomic sulfate and carbonate-rich passivating layers formed in the anode are responsible for chloride repelling and superior corrosion resistance of the salty-water-splitting anode.

Improved Corrosion Resistance and Increased Hardness of Copper Substrates from Cu-Ni/Ni-P Composite Coatings

MRS Advances ◽  
2020 ◽  
Vol 5 (40-41) ◽  
pp. 2129-2137 ◽  
Author(s):  
Wenwen Dou ◽  
Wen Li ◽  
Yuchen Cai ◽  
Mengyao Dong ◽  
Xiaojing Wang ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Electrochemical Impedance ◽  
Composite Coatings ◽  
Copper Substrate ◽  
Electrolytic Deposition ◽  
Deposition Method ◽  
Nacl Solution ◽  
Current Densities ◽  
Superior Corrosion Resistance ◽  
Deposition Conditions

ABSTRACTTo improve the corrosion resistance and to increase the hardness of copper substrate in marine environment, the Cu-Ni/Ni-P composite coatings were prepared on the copper substrate using the galvanostatic electrolytic deposition method. The deposition current densities were explored to find the optimized deposition conditions for forming the composite coatings. Corrosion resistance properties were analyzed using the polarization curves and electrochemical impedance spectroscopy (EIS). Considering the corrosion resistance and hardness, the −20 mA/cm2 was selected to deposit Cu-Ni coatings on copper substrate and the −30 mA/cm2 was selected to deposit Ni-P coating on the Cu-Ni layer. The Cu-Ni/Ni-P composite coatings not only exhibited superior corrosion resistance compared to single Cu-Ni coating in 3.5 wt.% NaCl solution, but also showed much better mechanical properties than single Cu-Ni coating.

scholarly journals Highly active oxygen evolution integrated with efficient CO2 to CO electroreduction

2019 ◽  
Vol 116 (48) ◽  
pp. 23915-23922 ◽  
Author(s):  
Yongtao Meng ◽  
Xiao Zhang ◽  
Wei-Hsuan Hung ◽  
Junkai He ◽  
Yi-Sheng Tsai ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Water Oxidation ◽  
Iron Hydroxide ◽  
Fuel Efficiency ◽  
Cell Voltage ◽  
Electrical Energy ◽  
Reduction Reaction ◽  
Faradaic Efficiency ◽  
Nickel Iron ◽  
Highly Active

Electrochemical reduction of CO2 to useful chemicals has been actively pursued for closing the carbon cycle and preventing further deterioration of the environment/climate. Since CO2 reduction reaction (CO2RR) at a cathode is always paired with the oxygen evolution reaction (OER) at an anode, the overall efficiency of electrical energy to chemical fuel conversion must consider the large energy barrier and sluggish kinetics of OER, especially in widely used electrolytes, such as the pH-neutral CO2-saturated 0.5 M KHCO3. OER in such electrolytes mostly relies on noble metal (Ir- and Ru-based) electrocatalysts in the anode. Here, we discover that by anodizing a metallic Ni–Fe composite foam under a harsh condition (in a low-concentration 0.1 M KHCO3 solution at 85 °C under a high-current ∼250 mA/cm2), OER on the NiFe foam is accompanied by anodic etching, and the surface layer evolves into a nickel–iron hydroxide carbonate (NiFe-HC) material composed of porous, poorly crystalline flakes of flower-like NiFe layer-double hydroxide (LDH) intercalated with carbonate anions. The resulting NiFe-HC electrode in CO2-saturated 0.5 M KHCO3 exhibited OER activity superior to IrO2, with an overpotential of 450 and 590 mV to reach 10 and 250 mA/cm2, respectively, and high stability for >120 h without decay. We paired NiFe-HC with a CO2RR catalyst of cobalt phthalocyanine/carbon nanotube (CoPc/CNT) in a CO2 electrolyzer, achieving selective cathodic conversion of CO2 to CO with >97% Faradaic efficiency and simultaneous anodic water oxidation to O2. The device showed a low cell voltage of 2.13 V and high electricity-to-chemical fuel efficiency of 59% at a current density of 10 mA/cm2.

scholarly journals In-situ interstitial alloying during laser powder bed fusion of AISI 316 for superior corrosion resistance

2021 ◽  
Vol 1 ◽  
pp. 100006
Author(s):  
Emilie Hørdum Valente ◽  
Venkata Karthik Nadimpalli ◽  
Thomas L. Christiansen ◽  
David Bue Pedersen ◽  
Marcel A.J. Somers
Keyword(s):  
Corrosion Resistance ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
Aisi 316 ◽  
Superior Corrosion Resistance

scholarly journals In Situ Formation of Nano Ni–Co Oxyhydroxide Enables Water Oxidation Electrocatalysts Durable at High Current Densities

2021 ◽  
pp. 2103812
Author(s):  
Jehad Abed ◽  
Shideh Ahmadi ◽  
Laura Laverdure ◽  
Ahmed Abdellah ◽  
Colin P. O'Brien ◽  
...  
Keyword(s):  
Water Oxidation ◽  
High Current ◽  
Current Densities ◽  
In Situ Formation

scholarly journals Nickel-iron catalysts for electrochemical water oxidation – redox synergism investigated by in situ X-ray spectroscopy with millisecond time resolution

2018 ◽  
Vol 2 (9) ◽  
pp. 1986-1994 ◽  
Author(s):  
Diego González-Flores ◽  
Katharina Klingan ◽  
Petko Chernev ◽  
Stefan Loos ◽  
Mohammad Reza Mohammadi ◽  
...  
Keyword(s):  
Time Resolution ◽  
Water Oxidation ◽  
Redox Chemistry ◽  
Iron Catalysts ◽  
Alkaline Water ◽  
X Ray ◽  
Nickel Iron

NiFe oxyhydroxides are prime candidates for efficient alkaline water oxidation; their redox chemistry is tracked by X-ray spectroscopy.

In Situ Rapid Formation of a Nickel–Iron-Based Electrocatalyst for Water Oxidation

ACS Catalysis ◽  
2016 ◽  
Vol 6 (10) ◽  
pp. 6987-6992 ◽  
Author(s):  
Jianying Wang ◽  
LvLv Ji ◽  
Zuofeng Chen
Keyword(s):  
Water Oxidation ◽  
Nickel Iron ◽  
Rapid Formation ◽  
Iron Based

ALLEGHENY LUDLUM AL 825 ALLOY

Alloy Digest ◽  
1989 ◽  
Vol 38 (1) ◽  
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
Stress Corrosion Cracking ◽  
Copper Alloy ◽  
Heat Treating ◽  
Nickel Iron ◽  
Temperature Performance ◽  
Superior Corrosion Resistance ◽  
Iron Chromium

Abstract Allegheny Ludlum AL 825 alloy is a nickel-iron-chromium-molybdenum-copper alloy with superior corrosion resistance including stress-corrosion cracking resistance. It is highly ductile from cryogenic to well over 1000 F(538 C) temperatures. It is readily weldable. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Ni-366. Producer or source: Allegheny Ludlum Corporation.

Corrosion formation and phase transformation of nickel-iron hydroxide nanosheets array for efficient water oxidation

Nano Research ◽  
2021 ◽  
Author(s):  
Lanqian Gong ◽  
Huan Yang ◽  
Hongming Wang ◽  
Ruijuan Qi ◽  
Junlei Wang ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Water Oxidation ◽  
Iron Hydroxide ◽  
Nickel Iron

NIROMET 46

Alloy Digest ◽  
1969 ◽  
Vol 18 (10) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Iron Alloy ◽  
Heat Treating ◽  
Nickel Iron ◽  
Nickel Iron Alloy ◽  
Glass Seals

Abstract Niromet 46 is a 46% nickel-iron alloy having low and controlled coefficient of expansion. It is recommended for metal-to-glass seals and terminal bands in vitreous enameled resistors. This datasheet provides information on composition, physical properties, hardness, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Fe-39. Producer or source: Wilbur B. Driver Company.

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