Synergetic modulation of the electronic structure and hydrophilicity of nickel–iron hydroxide for efficient oxygen evolution by UV/ozone treatment

2020 ◽  
Vol 8 (27) ◽  
pp. 13437-13442
Author(s):  
Ying Pan ◽  
Yanfang Wu ◽  
H. Alex Hsain ◽  
Ran Su ◽  
Claudio Cazorla ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Oxygen Evolution ◽  
Iron Hydroxide ◽  
Ozone Treatment ◽  
Nickel Iron ◽  
Fe Hydroxide ◽  
Uv Ozone

Enhanced OER performance of Ni(Fe) hydroxide through UV/ozone treatment.

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.

Insight into the Boosted Electrocatalytic Oxygen Evolution Performance of Highly Hydrophilic Nickel–Iron Hydroxide

2019 ◽  
Vol 3 (1) ◽  
pp. 822-830 ◽  
Author(s):  
Yi Wei ◽  
Cheol-Hwan Shin ◽  
Emmanuel Batsa Tetteh ◽  
Byong-June Lee ◽  
Jong-Sung Yu
Keyword(s):  
Oxygen Evolution ◽  
Iron Hydroxide ◽  
Nickel Iron ◽  
Insight Into

Accelerated oxygen evolution kinetics on nickel–iron diselenide nanotubes by modulating electronic structure

2019 ◽  
Vol 11 ◽  
pp. 89-96 ◽  
Author(s):  
Bocheng Qiu ◽  
Lejuan Cai ◽  
Yang Wang ◽  
Sainan Ma ◽  
Yuen Hong Tsang ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Oxygen Evolution ◽  
Nickel Iron

A 3d-printed composite electrode for sustained electrocatalytic oxygen evolution

2020 ◽  
Vol 56 (60) ◽  
pp. 8476-8479
Author(s):  
Si Liu ◽  
Rongji Liu ◽  
Dandan Gao ◽  
Ivan Trentin ◽  
Carsten Streb
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Composite Electrode ◽  
Iron Hydroxide ◽  
Nickel Layer ◽  
Nickel Iron ◽  
3D Printed

3D-printed polymer mesh substrates are converted to composite microstructured electrodes for the electrocatalytic oxygen evolution reaction by stepwise functionalization with a conductive nickel layer and a nickel-iron hydroxide catalyst.

Amorphous nickel–iron hydroxide films on nickel sulfide nanoparticles for the oxygen evolution reaction

2020 ◽  
Vol 10 (6) ◽  
pp. 1708-1713 ◽  
Author(s):  
Wenjun He ◽  
Gang Ren ◽  
Ying Li ◽  
Dongbo Jia ◽  
Shiyun Li ◽  
...  
Keyword(s):  
Water Splitting ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
High Performance ◽  
Nickel Sulfide ◽  
Low Cost ◽  
Iron Hydroxide ◽  
Nickel Iron ◽  
Earth Abundant

The development of earth-abundant and low-cost electrocatalysts with high performance toward the oxygen evolution reaction (OER) plays a key role in water splitting.

Enhancing the power generation of Rhodopseudomonas palustris-based MFC

2020 ◽  
Vol 64 (1-4) ◽  
pp. 1261-1268
Author(s):  
Shu Otani ◽  
Dang-Trang Nguyen ◽  
Kozo Taguchi
Keyword(s):  
Activated Carbon ◽  
Rhodopseudomonas Palustris ◽  
Ozone Treatment ◽  
Maximum Power Density ◽  
On Demand ◽  
Long Time ◽  
Dry Conditions ◽  
Carbon Sheet ◽  
Uv Ozone

In this study, a portable and disposable paper-based microbial fuel cell (MFC) was fabricated. The MFC was powered by Rhodopseudomonas palustris bacteria (R. palustris). An activated carbon sheet-based anode pre-loaded organic matter (starch) and R. palustris was used. By using starch in the anode, R. palustris-loaded on the anode could be preserved for a long time in dry conditions. The MFC could generate electricity on-demand activated by adding water to the anode. The activated carbon sheet anode was treated by UV-ozone treatment to remove impurities and to improve its hydrophilicity before being loaded with R. palustris. The developed MFC could generate the maximum power density of 0.9 μW/cm2 and could be preserved for long-term usage with little performance degradation (10% after four weeks).

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