scholarly journals The effect of nanoparticulate PdO co-catalysts on the faradaic and light conversion efficiency of WO3 photoanodes for water oxidation

2021 ◽  
Author(s):  
Anna A. Wilson ◽  
Sacha Corby ◽  
Laia Francàs ◽  
James R. Durrant ◽  
Andreas Kafizas
Keyword(s):  
Conversion Efficiency ◽  
Water Oxidation ◽  
Faradaic Efficiency ◽  
Co Catalysts ◽  
Photocurrent Generation ◽  
Light Conversion Efficiency ◽  
Electron Extraction

PdO nanoparticles grown on the surface of nanostructured WO3 photoanodes dramatically increase the faradaic efficiency of water oxidation from 52% to 92%, whilst also enhancing photocurrent generation and electron extraction rates.

Fluorine and tin co-doping synergistically improves the photoelectrochemical water oxidation performance of TiO2 nanorod arrays by enhancing the ultraviolet light conversion efficiency

2019 ◽  
Vol 48 (32) ◽  
pp. 12096-12104 ◽  
Author(s):  
Tong Wu ◽  
Changlong Chen ◽  
Yuling Wei ◽  
Ranran Lu ◽  
Leshuang Wang ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Conversion Efficiency ◽  
Water Oxidation ◽  
Uv Light ◽  
Nanorod Arrays ◽  
Co Doping ◽  
Tio2 Nanorod Arrays ◽  
Oxidation Performance ◽  
Photoelectrochemical Water Oxidation ◽  
Light Conversion Efficiency

Fluorine and tin co-doping changes the electronic structure of rutile TiO2 nanorod arrays, leading to much-enhanced UV light conversion efficiency and significantly improved photoelectrochemical water oxidation performance.

scholarly journals Ferroelectric Materials: A Novel Pathway for Efficient Solar Water Splitting

2018 ◽  
Vol 8 (9) ◽  
pp. 1526 ◽  
Author(s):  
Sangmo Kim ◽  
Nguyen Nguyen ◽  
Chung Bark
Keyword(s):  
Solar Energy ◽  
Water Splitting ◽  
Conversion Efficiency ◽  
Water Oxidation ◽  
Complex Structure ◽  
Ferroelectric Materials ◽  
Promising Candidate ◽  
Solar Water ◽  
Solar Water Splitting ◽  
The Past

Over the past few decades, solar water splitting has evolved into one of the most promising techniques for harvesting hydrogen using solar energy. Despite the high potential of this process for hydrogen production, many research groups have encountered significant challenges in the quest to achieve a high solar-to-hydrogen conversion efficiency. Recently, ferroelectric materials have attracted much attention as promising candidate materials for water splitting. These materials are among the best candidates for achieving water oxidation using solar energy. Moreover, their characteristics are changeable by atom substitute doping or the fabrication of a new complex structure. In this review, we describe solar water splitting technology via the solar-to-hydrogen conversion process. We will examine the challenges associated with this technology whereby ferroelectric materials are exploited to achieve a high solar-to-hydrogen conversion efficiency.

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.

Optical Management with Nanoparticles for a Light Conversion Efficiency Enhancement in Inorganic γ-CsPbI3 Solar Cells

Nano Letters ◽  
2019 ◽  
Vol 19 (3) ◽  
pp. 1796-1804 ◽  
Author(s):  
Lei Liang ◽  
Miao Liu ◽  
Zhiwen Jin ◽  
Qian Wang ◽  
Haoran Wang ◽  
...  
Keyword(s):  
Solar Cells ◽  
Conversion Efficiency ◽  
Efficiency Enhancement ◽  
Light Conversion Efficiency ◽  
Optical Management

Stable hydrogen generation from Ni- and Co-based co-catalysts in supported CdS PEC cell

2016 ◽  
Vol 45 (27) ◽  
pp. 11120-11128 ◽  
Author(s):  
Alka Pareek ◽  
Pradip Paik ◽  
Pramod H. Borse
Keyword(s):  
Water Oxidation ◽  
Hydrogen Generation ◽  
Co Catalysts

Schematic summarizing CdS photoanode modification by nano Ni(OH)2, NiO, Co(OH)2, and Co3O4 water-oxidation co-catalysts resulting in enhancement of stability of photoelectrochemical (PEC) cell electrodes for >8 h. The NiO modified photoanode yields large PEC H2-evolution of 2.5 mmol h−1.

ChemInform Abstract: Enhanced Visible Light Conversion Efficiency Using Nanocrystalline WO3 Films.

ChemInform ◽  
2010 ◽  
Vol 32 (28) ◽  
pp. no-no
Author(s):  
Clara Santato ◽  
Martine Ulmann ◽  
Jan Augustynski
Keyword(s):  
Visible Light ◽  
Conversion Efficiency ◽  
Light Conversion Efficiency
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