scholarly journals Manufacturing CuxZn1-xS Photocatalysts and Their Solar H2 Production Characteristics with Varying Cu Content

2020 ◽  
Vol 58 (12) ◽  
pp. 907-914
Author(s):  
Soojin Kahng ◽  
Jung Hyeun Kim
Keyword(s):  
Production Rate ◽  
Surface Area ◽  
Water Splitting ◽  
Light Absorption ◽  
Photoelectron Spectroscopy ◽  
H2 Production ◽  
X Ray ◽  
Solar Water ◽  
Solar Water Splitting ◽  
Vis Spectroscopy

Solar water splitting is an attractive method for producing hydrogen from renewable natural resources, and heterostructure photocatalysts have been widely investigated for photocatalytic applications. Hetero-component photocatalysts can reduce the charge recombination process by improving electron utilization, and are considered promising candidates for solar water splitting. Amongst various heterostructure systems, combinations of copper and zinc have been advantageous for constructing efficient band potential energy systems. In this work, CuxZn1-xS composite photocatalysts were solvothermally prepared with various copper contents. The morphology of the CuxZn1-xS photocatalysts was examined using scanning electron microscopy, and the crystalline structures were established with an X-ray diffractometer. Atomic analyses of the surface components of the photocatalysts were performed using X-ray photoelectron spectroscopy. UV-Vis spectroscopy and photoluminescence spectroscopy were also used to examine the efficiency of the photocatalysts’ light responses. Brunauer Emmett Teller analyses were employed to characterize the surface area and pore volume of the photocatalysts. Among the various CuxZn1-xS compositions, the highest H2 production rate was determined to be 1122 µmol g<sup>-1</sup> h<sup>-1</sup> from the Cu0.03Zn0.97S photocatalyst. This highest H2 production rate is strongly related to the observed efficient light absorption, and its influence on charge generation. The improvement is mainly attributed to the optimized charge separation and utilization, high visible light absorption, and high surface area of the photocatalyst.

scholarly journals Enhanced Solar Water Splitting Performance of 50-100 nm Pore Sized TiO2 Nanotubes

2019 ◽  
Vol 31 (3) ◽  
pp. 559-565
Author(s):  
K. Kathiresan ◽  
P. Elangovan ◽  
M.S.S. Saravanakumaar
Keyword(s):  
Water Splitting ◽  
Photoelectron Spectroscopy ◽  
Hydrofluoric Acid ◽  
Tio2 Nanotubes ◽  
Uv Light ◽  
Photoelectrochemical Performance ◽  
X Ray ◽  
Solar Water ◽  
Solar Water Splitting ◽  
The Impact

Herein, we report the fabrication of titanium dioxide nanotubes via anodization technique through with and without hydrofluoric acid . The impact of hydrofluoric acid followed by annealing effect on TiO2 nanotubes for the solar water splitting performance was examined. Prepared TiO2 samples exhibited a diameter of about 50 to 100 nm sized nanotubes and hierarchical structures and they subjected to annealing. Synthesis and annealing effects on chemical, physical and photoelectrochemical water splitting activity of TiO2 samples were scrutinized. The crystalline nature, structure and surface morphologies of prepared TiO2 photocatalysts were explored by X-ray diffraction, scanning electron microscope, and the oxidation states of both titanium and oxygen was determined by X-ray photoelectron spectroscopy. As a consequence, after annealing at 500 ºC, TiO2 thin films treated with hydrofluoric acid solution (HF-TiO2) were found to exhibit a remarkable photoelectrochemical performance than bare TiO2 nanotubes under UV light irradiation. Moreover, the mechanistic insights acquired in the current research would be beneficial to design a novel and highly efficient photocatalyst for solar water splitting systems.

Carrier Engineering of Zr-mediated Ta3N5 Film as Efficient Photoanode for Solar Water Splitting

2021 ◽  
Author(s):  
Xin Zou ◽  
Xueyang Han ◽  
Chengxiong Wang ◽  
Yunkun Zhao ◽  
Chun Du ◽  
...  
Keyword(s):  
Band Structure ◽  
Visible Light ◽  
Water Splitting ◽  
Light Absorption ◽  
Photoelectrochemical Water Splitting ◽  
Promising Candidate ◽  
Visible Light Absorption ◽  
Solar Water ◽  
Solar Water Splitting

Ta3N5 is regarded as a promising candidate material with adequate visible light absorption and band structure for photoelectrochemical water splitting. However, the performance of Ta3N5 is severely limited by the...

How bubbles affect light absorption in photoelectrodes for solar water splitting?

2022 ◽  
Author(s):  
Abhinav Bhanawat ◽  
Keyong Zhu ◽  
Laurent Pilon
Keyword(s):  
Water Splitting ◽  
Light Absorption ◽  
Incident Light ◽  
Gas Bubbles ◽  
Photoelectrochemical Water Splitting ◽  
Solar Water ◽  
Solar Water Splitting

This paper aims to systematically investigate the effect of gas bubbles formation on the performance of a horizontal photoelectrode exposed to normally incident light during photoelectrochemical water splitting. The presence...

scholarly journals Combinatorial Search for New Solar Water Splitting Photoanode Materials in the Thin-Film System Fe–Ti–W–O

2020 ◽  
Vol 234 (5) ◽  
pp. 867-885 ◽  
Author(s):  
Swati Kumari ◽  
Chinmay Khare ◽  
Fanxing Xi ◽  
Mona Nowak ◽  
Kirill Sliozberg ◽  
...  
Keyword(s):  
Thin Film ◽  
Water Splitting ◽  
Spin Coating ◽  
Photocurrent Density ◽  
Coated Sample ◽  
X Ray Diffraction ◽  
Film Library ◽  
X Ray ◽  
Solar Water ◽  
Solar Water Splitting

AbstractIn order to identify new solar water splitting photoanodes, Fe–Ti–W–O materials libraries were fabricated by combinatorial reactive co-sputtering and investigated by high-throughput characterization methods to elucidate compositional, thickness, and structural properties. In addition, photoelectrochemical measurements such as potentiodynamic photocurrent determination and open circuit potential measurements were performed using an automated scanning droplet cell. In the thin-film library, a quaternary photoactive region Fe30–49Ti29–55W13–22Ox was identified as a hit composition region, comprising binary and ternary phases. The identified region shows a distinct surface morphology with larger grains (∼200 nm) being embedded into a matrix of smaller grains (∼80–100 nm). A maximum photocurrent density of 117 μA/cm2 at a bias potential of 1.45 V vs. RHE in NaClO4 as an electrolyte under standard solar simulating conditions was recorded. Additional samples with compositions from the hit region were fabricated by reactive co-sputtering and spin coating followed by annealing. Synchrotron X-ray diffraction of sputtered Fe32Ti52W16Ox thin-films, annealed in air (600 °C, 700 °C, 800 °C) revealed the presence of the phases FeTiO3 and Ti0.54W0.46O2. The composition Fe48Ti30W22Ox from the hit region was fabricated by spin coating and subsequent annealing for a detailed investigation of its structure and photoactivity. After annealing the spin-coated sample at 650 °C for 6 h, X-ray diffraction results showed a dominant pattern with narrow diffraction lines belonging to a distorted FeWO4 (ferberite) phase along with broad diffraction lines addressed as Fe2TiO5 and in a small fraction also, Fe1.7Ti0.23O3. In hematite, Fe can be substituted by Ti, therefore we suggest that in the newfound ferberite-type phase, Ti partially substitutes for Fe leading to a small lattice distortion and a doubling of the monoclinic unit cell. In addition, Na from the substrate stabilizes the new phase: its tentative chemical formula is NaxFe0.33Ti0.67W2O8. A maximum photocurrent density of around 0.43 mA/cm2 at 1.45 V vs. RHE in 1M NaOH (pH ∼ 13.6) as an electrolyte was measured. Different aspects of the dependence of annealing and precursor solution concentration on phase transformation and photoactivity are discussed.

Rational design of a novel quaternary ZnO@ZnS/Ag@Ag2S nanojunction system for enhanced photocatalytic H2 production

2018 ◽  
Vol 5 (12) ◽  
pp. 3074-3081 ◽  
Author(s):  
Yiping Su ◽  
Zhicheng Zhao ◽  
Shun Li ◽  
Fei Liu ◽  
Zuotai Zhang
Keyword(s):  
Water Splitting ◽  
Rational Design ◽  
H2 Production ◽  
Solar Water ◽  
Solar Water Splitting

A novel ZnO@ZnS/Ag@Ag2S quaternary nanojunction photocatalyst has been designed for efficient solar water splitting.

scholarly journals Operando X-ray Absorption Spectroscopy (XAS) Observation of Photoinduced Oxidation in FeNi (Oxy)hydroxide Overlayers on Hematite (α-Fe2O3) Photoanodes for Solar Water Splitting

Langmuir ◽  
2020 ◽  
Vol 36 (39) ◽  
pp. 11564-11572
Author(s):  
Anton Tsyganok ◽  
Paolo Ghigna ◽  
Alessandro Minguzzi ◽  
Alberto Naldoni ◽  
Vadim Murzin ◽  
...  
Keyword(s):  
Water Splitting ◽  
Absorption Spectroscopy ◽  
X Ray ◽  
Solar Water ◽  
Solar Water Splitting ◽  
X Ray Absorption

scholarly journals Protagonists and spectators during photocatalytic solar water splitting with SrTaOxNy oxynitride

2021 ◽  
Author(s):  
Craig Lawley ◽  
Zahra Pourmand Tehrani ◽  
Adam Hugh Clark ◽  
Olga V. Safonova ◽  
Max Döbeli ◽  
...  
Keyword(s):  
Visible Light ◽  
Water Splitting ◽  
Grazing Incidence ◽  
Operating Conditions ◽  
Photoelectrochemical Cell ◽  
Light Water ◽  
X Ray ◽  
Solar Water ◽  
Solar Water Splitting

Oxynitrides have been shown to be promising visible light water splitting photocatalysts, but rapidly degrade under operating conditions. With a custom designed photoelectrochemical cell, we perform operando grazing incidence X-ray...

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