scholarly journals Tuning Light‐Driven Water Oxidation Efficiency of Molybdenum‐Doped BiVO 4 by Means of Multicomposite Catalysts Containing Nickel, Iron, and Chromium Oxides

ChemPlusChem ◽  
2020 ◽  
Vol 85 (2) ◽  
pp. 327-333 ◽  
Author(s):  
Olga A. Krysiak ◽  
João R. C. Junqueira ◽  
Felipe Conzuelo ◽  
Tim Bobrowski ◽  
Patrick Wilde ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Chromium Oxides ◽  
Nickel Iron ◽  
Oxidation Efficiency

Ultrathin nickel–iron layered double hydroxide nanosheets intercalated with molybdate anions for electrocatalytic water oxidation

2015 ◽  
Vol 3 (31) ◽  
pp. 16348-16353 ◽  
Author(s):  
Na Han ◽  
Feipeng Zhao ◽  
Yanguang Li
Keyword(s):  
Layered Double Hydroxide ◽  
Water Oxidation ◽  
Nickel Iron ◽  
Ultrathin Nanosheets ◽  
Double Hydroxide

Incorporation of molybdate ions into a NiFe-LDH structure leads to the formation of ultrathin nanosheets with enhanced OER performance.

scholarly journals Measurement methods of total organic carbon in seawater

2021 ◽  
Vol 233 ◽  
pp. 01078
Author(s):  
Shuwei Zhang ◽  
Zhaoyu Wang ◽  
Xuejiao Yan ◽  
Jing Wang ◽  
Li Zhang ◽  
...  
Keyword(s):  
High Temperature ◽  
Organic Carbon ◽  
Total Organic Carbon ◽  
Water Oxidation ◽  
Combustion Method ◽  
Oxidation Method ◽  
Persulfate Oxidation ◽  
Temperature Combustion ◽  
Oxidation Efficiency ◽  
High Temperature Combustion

Total organic carbon (TOC) can reflect the total amount of organic matter in water. This paper introduces the common methods of measuring organic carbon, including high temperature combustion method, potassium persulfate oxidation method, spectrometry, ozone oxidation chemiluminescence method, supercritical water oxidation method and so on. At present, high temperature combustion method is the most widely used method for TOC measurement in seawater, because of its high oxidation efficiency. TOC sensor needs to be developed to realize in-situ and long-term monitoring.

scholarly journals Introducing Fe2+ into Nickel-Iron Layered Double Hydroxide: Local Structure Modulated Water Oxidation Activity

2018 ◽  
Vol 57 (30) ◽  
pp. 9392-9396 ◽  
Author(s):  
Zhao Cai ◽  
Daojin Zhou ◽  
Maoyu Wang ◽  
Seong-Min Bak ◽  
Yueshen Wu ◽  
...  
Keyword(s):  
Layered Double Hydroxide ◽  
Water Oxidation ◽  
Local Structure ◽  
Oxidation Activity ◽  
Nickel Iron ◽  
Double Hydroxide

Highly dispersed and disordered nickel–iron layered hydroxides and sulphides: robust and high-activity water oxidation catalysts

2018 ◽  
Vol 2 (7) ◽  
pp. 1561-1573 ◽  
Author(s):  
Manjunath Chatti ◽  
Alexey M. Glushenkov ◽  
Thomas Gengenbach ◽  
Gregory P. Knowles ◽  
Tiago C. Mendes ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Low Temperature ◽  
High Activity ◽  
Water Oxidation ◽  
Microwave Assisted Synthesis ◽  
Oxidation Catalysts ◽  
Alkaline Water ◽  
Nickel Iron ◽  
Microwave Assisted ◽  
Highly Dispersed

A rapid low-temperature microwave-assisted synthesis of nickel(iron) layered hydroxides and sulphides that exhibit robust catalytic activity for electrooxidation of alkaline water is introduced.

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.

TiO2/graphene/NiFe-layered double hydroxide nanorod array photoanodes for efficient photoelectrochemical water splitting

2016 ◽  
Vol 9 (8) ◽  
pp. 2633-2643 ◽  
Author(s):  
Fanyu Ning ◽  
Mingfei Shao ◽  
Simin Xu ◽  
Yi Fu ◽  
Ruikang Zhang ◽  
...  
Keyword(s):  
Water Splitting ◽  
Layered Double Hydroxide ◽  
Water Oxidation ◽  
Charge Separation ◽  
Nanorod Array ◽  
Photoelectrochemical Water Splitting ◽  
Nanorod Arrays ◽  
Highly Efficient ◽  
Oxidation Efficiency ◽  
Double Hydroxide

TiO2/graphene/NiFe-layered double hydroxide nanorod arrays were fabricated as highly efficient photoanodes for photoelectrochemical water splitting with simultaneously enhanced charge separation and water oxidation efficiency.

Redox sculptured dual-scale porous nickel-iron foams for efficient water oxidation

2019 ◽  
Vol 309 ◽  
pp. 415-423 ◽  
Author(s):  
Yanyan Wu ◽  
Ren Su ◽  
Ying Li ◽  
Zhihong Wang ◽  
Zhe Lü ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Porous Nickel ◽  
Nickel Iron ◽  
Dual Scale
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