Cu2O nanowires based p-n homojunction photocathode for improved current density and hydrogen generation through solar-water splitting

Hamdani, Iqra Reyaz; Bhaskarwar, Ashok N.

doi:10.1016/j.ijhydene.2021.06.067

Cited by 15 publications

(9 citation statements)

References 46 publications

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“…The rapid depletion of the accessible deposits of fossil fuels which contribute to the majority of the current energy sources and their effect on climate change have increasingly prompted research and development for environmentally friendly and sustainable alternate energy resources. 1,2 Hydrogen is regarded as a versatile, environmentally friendly, and clean energy carrier (heating value = 142 MJ/kg), which upon combustion releases only heat and water. 3−5 Having three times the energy storage capacity (per unit weight) of other liquid fuels, hydrogen has the potential to completely replace fossil fuels in the future.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Dehydrogenation of Methane to Hydrogen and Carbon Nanostructures with Fe–Mo Bimetallic Catalysts

Chulliyil,

Hamdani,

Ahmad

et al. 2024

Ind. Eng. Chem. Res.

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As a pathway to green hydrogen, the catalytic dehydrogenation of methane is an economical and CO x -free alternative to produce sufficient volumes of hydrogen to address energy sustainability. This work attempts to develop a catalyst to enhance conversion, stability, and favorable carbon nanostructures. Monometallic Fe catalysts were synthesized on a mesoporous carbon template to identify the best catalyst synthesis methodology covering incipient wetness, hydrothermal, and wet impregnation methods. As a logical step to enhance the conversion, stability, and ease of separation of the catalyst from the product carbon, a bimetallic Fe−Mo was synthesized on the same mesoporous carbon template for the first time, using the hydrothermal method, by varying the Mo loading from 2.5 to 15%. The optimal catalyst design had a composition of 30%Fe−5%Mo with a specific surface area of 606.9 g/m 2 , offering the highest conversion and stability, at a temperature of 950 °C. The highest conversion corresponded to the lowest space velocity, highest reaction temperature, and highest CH 4 concentration, with a maximum conversion of 90% and being stable until the end of 2 h of reaction time. X-ray diffraction analysis revealed the presence of Fe 2 O 3 and mixed oxides, Fe 2 (MoO 4 ) 3 and FeMoO 4 in the bimetallic catalyst. The initial H 2 yield was ∼61%, and it decreased during the reaction, reaching 48% after 4 h of reaction. Various structural, textural, and morphological characterizations of the catalyst pre-and postreaction were performed using advanced analytical techniques. Graphitic carbon, an Fe−Mo alloy, and FeMoO 4 phases were observed by XRD patterns of the spent catalyst. Carbon depositions with varying morphologies were observed under different reaction conditions ranging from carbon nanoparticles and carbon nanotubes to agglomerates of nanoparticles and nanoflowers. A well-defined network of carbon nanoflowers along with bamboo-shaped carbon nanotubes could be observed over the surface of the best catalyst under the optimized reaction conditions.

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Section: Introductionmentioning

confidence: 99%

Catalytic Dehydrogenation of Methane to Hydrogen and Carbon Nanostructures with Fe–Mo Bimetallic Catalysts

Chulliyil,

Hamdani,

Ahmad

et al. 2024

Ind. Eng. Chem. Res.

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“…Global energy consumption is rapidly increasing, causing an increase in CO 2 emissions in the atmosphere, which in turn contributes to global warming. − As climate change continues to take its toll, the development of clean and renewable energy sources is imperative to alleviate high usage of fossil fuels . Hydrogen, having a mass calorific value of ∼148 MJ/kg, is envisioned as a fuel of the future that can serve as an alternative sustainable energy carrier. , Besides, it is a critical feedstock to various manufacturing industries, such as oil refineries, ammonia production, fuel-cell electric vehicles, aircrafts, and methanol production . The main pathways for H 2 production are from fossil fuels (hydrocarbons), water (electro- or photolysis and thermochemical), or photosynthetic microorganisms (biological) (Table ).…”

Section: Introductionmentioning

confidence: 99%

Thermocatalytic Decomposition of Methane: A Review on Carbon-Based Catalysts

Hamdani,

Ahmad,

Chulliyil

et al. 2023

ACS Omega

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The global initiatives on sustainable and green energy resources as well as large methane reserves have encouraged more research to convert methane to hydrogen. Catalytic decomposition of methane (CDM) is one optimistic route to generate clean hydrogen and value-added carbon without the emission of harmful greenhouse gases, typically known as blue hydrogen. This Review begins with an attempt to understand fundamentals of a CDM process in terms of thermodynamics and the prerequisite characteristics of the catalyst materials. In-depth understanding of rate-determining steps of the heterogeneous catalytic reaction taking place over the catalyst surfaces is crucial for the development of novel catalysts and process conditions for a successful CDM process. The design of state-of-the-art catalysts through both computational and experimental optimizations is the need of hour, as it largely governs the economy of the process. Recent mono- and bimetallic supported and unsupported materials used in CDM process have been highlighted and classified based on their performances under specific reaction conditions, with an understanding of their advantages and limitations. Metal oxides and zeolites have shown interesting performance as support materials for Fe- and Ni-based catalysts, especially in the presence of promoters, by developing strong metal–support interactions or by enhancing the carbon diffusion rates. Carbonaceous catalysts exhibit lower conversions without metal active species and largely result in the formation of amorphous carbon. However, the stability of carbon catalysts is better than that of metal oxides at higher temperatures, and the overall performance depends on the operating conditions, catalyst properties, and reactor configurations. Although efforts to summarize the state-of-art have been reported in literature, they lack systematic analysis on the development of stable and commercially appealing CDM technology. In this work, carbon catalysts are seen as promising futuristic pathways for sustained H2 production and high yields of value-added carbon nanomaterials. The influence of the carbon source, particle size, surface area, and active sites on the activity of carbon materials as catalysts and support templates has been demonstrated. Additionally, the catalyst deactivation process has been discussed, and different regeneration techniques have been evaluated. Recent studies on theoretical models towards better performance have been summarized, and future prospects for novel CDM catalyst development have been recommended.

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“…The increasing energy demand and environmental problems, such as contamination from the combustion of fossil fuels, [1] have brought the need to use alternative energy sources for energy production [2,3]. Cu 2 O is a promising candidate for photovoltaic applications as a possible solution to the global energy crisis [1,4], providing alternative, safe, and sustainable energy sources [3]. Examples of this are the conversion of solar energy into electrical energy [5][6][7] and the generation of hydrogen from the photoelectrochemical conversion of the sun [3,8].…”

Section: Introductionmentioning

confidence: 99%

“…Cu 2 O is a promising candidate for photovoltaic applications as a possible solution to the global energy crisis [1,4], providing alternative, safe, and sustainable energy sources [3]. Examples of this are the conversion of solar energy into electrical energy [5][6][7] and the generation of hydrogen from the photoelectrochemical conversion of the sun [3,8].…”

Section: Introductionmentioning

confidence: 99%

Evolution of Structural and Optical Properties of Cuprous Oxide Particles for Visible Light Absorption

Carrasco-Hernández

Ontiveros

Martínez‐Guerra

et al. 2022

Journal of Nanomaterials

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Absorbent materials are being developed to replace semiconductor materials such as p-type silicon, GaAs, CdTe, and quaternary compounds such as CIGS (copper indium gallium selenide). Cu2O is a potential candidate because it is non-toxic, inexpensive, an abundant compound in the Earth’s crust, and has good optical properties, such as a high absorption coefficient. In this work, Cu2O was obtained simply by reducing Benedict’s solution with glucose in an alkaline medium (pH 10.2 ± 0.2) at 65°C. The samples were synthesized by varying glucose content from 1 g to 7 g. The results showed a phase proportion variation between 95.56% and 99.50% of the Cu2O phase. It was found that the changes in crystallite size, microstrains, particle size, and morphology are due to reaction times, which were influenced by the use of different glucose amounts. The use of a higher glucose amount in the synthesis favors a faster reaction, forming smaller crystallites with more microstrains. Lower glucose amount leads to a slower reaction giving the crystallites more time to grow, which relaxes the microstrains. When increasing glucose content, the obtained morphologies changed from cubes, irregular cubes, prismatic spheres, cauliflower-like, to spherical shapes. The XPS spectra confirmed only the presence of chemical species such as Cu(I) and Cu(II), and chemical defects, such as oxygen vacancies (Vo), were detected in the samples. All samples presented a broad absorption range from 200 nm to 570 nm indistinctly of the morphology. The band gap showed an insignificant change from 2.04 eV to 2.09 eV when glucose was increased from 1 g to 7 g. The in-situ phase transformation study was analyzed from 25°C to 700°C. The results indicated a phase transition from Cu2O to Cu and CuO when the temperature was above 280°C.

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Cu2O nanowires based p-n homojunction photocathode for improved current density and hydrogen generation through solar-water splitting

Cited by 15 publications

References 46 publications

Catalytic Dehydrogenation of Methane to Hydrogen and Carbon Nanostructures with Fe–Mo Bimetallic Catalysts

Catalytic Dehydrogenation of Methane to Hydrogen and Carbon Nanostructures with Fe–Mo Bimetallic Catalysts

Thermocatalytic Decomposition of Methane: A Review on Carbon-Based Catalysts

Evolution of Structural and Optical Properties of Cuprous Oxide Particles for Visible Light Absorption

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