scholarly journals Effects of Preparation Conditions on the Efficiency of Visible-Light-Driven Hydrogen Generation Based on Cd0.25Zn0.75S Photocatalysts

Catalysts ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1534
Author(s):  
Maali-Amel Mersel ◽  
Lajos Fodor ◽  
Péter Pekker ◽  
Miklós Jakab ◽  
Éva Makó ◽  
...  
Keyword(s):  
Hydrogen Generation ◽  
Clean Energy ◽  
H2 Production ◽  
High Photocatalytic Activity ◽  
Morphological Properties ◽  
Ammine Complexes ◽  
Ammonia Content ◽  
Practical Utilization ◽  
Preparation Conditions ◽  
Environmentally Friendly Process

Photocatalytic H2 production utilizing H2S, an industrial side-product, is regarded as an environmentally friendly process to produce clean energy through direct solar energy conversion. For this purpose, sulfide-based materials, such as photocatalysts, have been widely used due to their good solar response and high photocatalytic activity. In this work, a ZnS–CdS composite was studied, and special attention was dedicated to the influence of the preparation parameters on its H2 production activity. The ZnS–CdS composite, with an enhanced photoactivity for H2 production, was synthesized both from ammine complexes and, in a conventional way, directly from acetates at various pH values. Deviating from the traditional method, the photoactivity of ZnS–CdS prepared from ammine complexes was not affected by the pH. Besides, the hydrothermal treatment and the ammonia content strongly influenced the rate of H2 production in this system. DRS, TEM, SEM, XRD, and quantum yield measurements prove the dependence of the photoactivity of these catalysts on the structural and morphological properties determined by the preparation conditions. The promising photocatalytic efficiency achieved with the application of these ZnS–CdS catalysts, prepared without any metal deposition, encourages further investigations to enhance the rate of hydrogen generation by optimization of the reaction conditions for practical utilization.

Synthesis of hierarchical MoSe2 nanolayers on sodium sulfide crystals for electrocatalytic hydrogen evolution

CrystEngComm ◽  
2021 ◽  
Author(s):  
Xiaoshuang Chen ◽  
Meina Ju ◽  
Kun Song ◽  
Guoli Chen ◽  
Rui Yang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Hydrogen Evolution ◽  
High Performance ◽  
Sodium Sulfide ◽  
Hydrogen Generation ◽  
Clean Energy

Hydrogen generation via water electroreduction is a pivotal portion of exploiting clean-energy skills. Nevertheless, developing a low price and high-performance catalytic activity substance to take the place of expensively precious...

Bifunctional single-atomic Mn sites for energy-efficient hydrogen production

Nanoscale ◽  
2021 ◽  
Author(s):  
Xianyun Peng ◽  
Junrong Hou ◽  
Yuying Mi ◽  
Jiaqiang Sun ◽  
Gaocan Qi ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Energy Saving ◽  
Hydrogen Evolution Reaction ◽  
Energy Efficient ◽  
Low Cost ◽  
Clean Energy ◽  
H2 Production ◽  
Energy Technology ◽  
Highly Active ◽  
Clean Energy Technology

Electrocatalytic hydrogen evolution reaction (HER) for H2 production is essential for future renewable and clean energy technology. Screening energy-saving, low-cost, and highly active catalysts efficiently, however, is still a grand...

scholarly journals Copper Nanowires as Highly Efficient and Recyclable Catalyst for Rapid Hydrogen Generation from Hydrolysis of Sodium Borohydride

Nanomaterials ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 1153 ◽  
Author(s):  
Aina Shasha Hashimi ◽  
Muhammad Amirul Nazhif Mohd Nohan ◽  
Siew Xian Chin ◽  
Poi Sim Khiew ◽  
Sarani Zakaria ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Sodium Borohydride ◽  
Fossil Fuels ◽  
Hydrogen Generation ◽  
Clean Energy ◽  
Catalytic Performance ◽  
Copper Nanowires ◽  
H2 Generation ◽  
Hydrolysis Of ◽  
Hydrolysis Of Nabh4

Hydrogen (H2) is a clean energy carrier which can help to solve environmental issues with the depletion of fossil fuels. Sodium borohydride (NaBH4) is a promising candidate material for solid state hydrogen storage due to its huge hydrogen storage capacity and nontoxicity. However, the hydrolysis of NaBH4 usually requires expensive noble metal catalysts for a high H2 generation rate (HGR). Here, we synthesized high-aspect ratio copper nanowires (CuNWs) using a hydrothermal method and used them as the catalyst for the hydrolysis of NaBH4 to produce H2. The catalytic H2 generation demonstrated that 0.1 ng of CuNWs could achieve the highest volume of H2 gas in 240 min. The as-prepared CuNWs exhibited remarkable catalytic performance: the HGR of this study (2.7 × 1010 mL min−1 g−1) is ~3.27 × 107 times higher than a previous study on a Cu-based catalyst. Furthermore, a low activation energy (Ea) of 42.48 kJ mol−1 was calculated. Next, the retreated CuNWs showed an outstanding and stable performance for five consecutive cycles. Moreover, consistent catalytic activity was observed when the same CuNWs strip was used for four consecutive weeks. Based on the results obtained, we have shown that CuNWs can be a plausible candidate for the replacement of a costly catalyst for H2 generation.

Construction of CuInS2/Ag sensitized ZnO nanowire arrays for efficient hydrogen generation

RSC Advances ◽  
2015 ◽  
Vol 5 (99) ◽  
pp. 81723-81727 ◽  
Author(s):  
Zhongzhou Cheng ◽  
Xueying Zhan ◽  
Fengmei Wang ◽  
Qisheng Wang ◽  
Kai Xu ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
Band Gap ◽  
Hydrogen Evolution ◽  
Hydrogen Generation ◽  
Clean Energy ◽  
Nanowire Arrays ◽  
Zno Nanowire ◽  
Energy Applications ◽  
Hydrogen Evolution Rate ◽  
Tunable Band Gap

Due to its smaller and tunable band gap, CuInS2 has attracted much attention for clean energy applications. With the synergistic effect of Ag and CuInS2 NPs, the PEC performance and hydrogen evolution rate of ZnO NWs are significantly enhanced.

scholarly journals Construction of UiO-66/Bi4O5Br2 Type-II Heterojunction to Boost Charge Transfer for Promoting Photocatalytic CO2 Reduction Performance

2021 ◽  
Vol 9 ◽  
Author(s):  
Dongsheng Li ◽  
Bichen Zhu ◽  
Zhongti Sun ◽  
Qinqin Liu ◽  
Lele Wang ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Self Assembly ◽  
Co2 Reduction ◽  
Clean Energy ◽  
High Photocatalytic Activity ◽  
Type Ii ◽  
Co Catalysts ◽  
Tight Contact ◽  
Assembly Method ◽  
Efficient Charge

One of the basic challenges of CO2 photoreduction is to develop efficient photocatalysts, and the construction of heterostructure photocatalysts with intimate interfaces is an effective strategy to enhance interfacial charge transfer for realizing high photocatalytic activity. Herein, a novel UiO-66/Bi4O5Br2 heterostructure photocatalyst was constructed by depositing UiO-66 nanoparticles with octahedral morphology over the Bi4O5Br2 nanoflowers assembled from the Bi4O5Br2 nanosheets via an electrostatic self-assembly method. A tight contact interface and a built-in electric field were formed between the UiO-66 and the Bi4O5Br2, which was conducive to the photo-electrons transfer from the Bi4O5Br2 to the UiO-66 and the formation of a type-II heterojunction with highly efficient charge separation. As a result, the UiO-66/Bi4O5Br2 exhibited improved photocatalytic CO2 reduction performance with a CO generation rate of 8.35 μmol h−1 g−1 without using any sacrificial agents or noble co-catalysts. This work illustrates an applicable tactic to develop potent photocatalysts for clean energy conversion.

scholarly journals Effective H2 Separation through Electroless Pore-Plated Pd Membranes Containing Graphite Lead Barriers

Membranes ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 410
Author(s):  
David Martinez-Diaz ◽  
Raúl Sanz ◽  
Alicia Carrero ◽  
José Antonio Calles ◽  
David Alique
Keyword(s):  
Linear Trend ◽  
Clean Energy ◽  
Composite Membranes ◽  
Energy System ◽  
H2 Production ◽  
Outer Side ◽  
Mechanical Resistance ◽  
Permeate Flux ◽  
Porous Stainless Steel ◽  
Current Energy

Hydrogen promotion as a clean energy vector could provide an efficient strategy for realizing real decarbonization of the current energy system. Purification steps are usually required in most H2-production processes, providing the use of Pd-based membranes, particularly those supported on porous stainless steel (PSS), important advantages against other alternatives. In this work, new composite membranes were prepared by modifying PSS supports with graphite, as an intermediate layer, before incorporating a palladium film by electroless pore-plating. Fully dense Pd layers were reached, with an estimated thickness of around 17 μm. Permeation measurements were carried out in two different modes: H2 permeation from the inner to the outer side of the membrane (in–out) and in the opposite way (out–in). H2 permeances between 3.24 × 10−4 and 4.33 × 10−4 mol m−2 s−1 Pa−0.5 with αH2/N2 ≥ 10,000 were reached at 350–450 °C when permeating from the outer to the inner surface. Despite a general linear trend between permeating H2 fluxes and pressures, the predicted intercept in (0,0) by the Sieverts’ law was missed due to the partial Pd infiltration inside the pores. H2-permeances progressively decreased up to around 33% for binary H2–N2 mixtures containing 40 vol% N2 due to concentration–polarization phenomena. Finally, the good performance of these membranes was maintained after reversing the direction of the permeate flux. This fact practically demonstrates an adequate mechanical resistance despite generating tensile stress on the Pd layer during operation, which is not accomplished in other Pd membranes.

Construction of Visible Light Responsive CdSe/g-C3N4 Nanocomposites for H2 Production

2019 ◽  
Vol 11 (9) ◽  
pp. 1281-1291
Author(s):  
Mohammad W. Kadi ◽  
Reda M. Mohamed ◽  
Adel. A. Ismail ◽  
Detlef W. Bahnemann
Keyword(s):  
Visible Light ◽  
Large Scale ◽  
Synthesis Method ◽  
Clean Energy ◽  
H2 Production ◽  
Photocatalytic Efficiency ◽  
Aqueous Synthesis ◽  
Xrd Diffraction ◽  
Orderly Fashion ◽  
Hexagonal Arrangement

Utilization of heterogeneous photocatalysts for H2 production using water splitting reaction under visible light is a promising approach for production of large scale sustainable, renewable, and clean energy. CdSe/g-C3N4 nanocomposites were synthesized in this study by employing a simple aqueous synthesis method. Various CdSe contents were tested as a photocatalyst in the H2 production. XRD diffraction results confirmed the hexagonal arrangement of CdSe and its incorporation onto g-C3N4. Spherical shaped CdSe nanoparticles were distributed on the g-C3N4 nanosheets in an orderly fashion. The photocatalytic efficiency of CdSe/g-C3N4 composites was assessed utilizing glycerol as a scavenger. The photocatalytic activity for H2 production was enhanced by increasing the CdSe content, reaching H2 yield of up to 26000 μmol·g-1 using 5% CdSe/g-C3N4 nanocomposite. The produced H2 was higher ∼86 and 52 times than g-C3N4 and CdSe. The H2 production yield also increased with increased 5% CdSe/g-C3N4 photocatalyst load.

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