Classification and technical target of water electrolysis for hydrogen production

Ham, Kahyun; Bae, Sooan; Lee, Jaeyoung

doi:10.1016/j.jechem.2024.04.003

Cited by 23 publications

(1 citation statement)

References 183 publications

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“…But these processes are energy-consuming, since they take place at high temperatures and, in addition to the target products, produce a large number of undesirable accompanying by-products. Alternatively, hydrogen can be synthesized using the process of water electrolysis [5] (which breaks down into O 2 and H 2 )-a less cost-effective method due to the amount of electricity required for the electrolysis. The approach we propose can completely or partially solve all these problems.…”

Section: Introductionmentioning

confidence: 99%

Methanol Reforming over Cu-Ce-Al Catalysts Prepared by Solution Combustion Synthesis Method

Assylbekov,

Xanthopoulou,

Tungatarova

et al. 2024

Catalysts

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The demand for environmentally friendly types of energy is growing all over the world, which naturally increases the intensity of studies on fuel mixtures that have high contents of hydrogen. In this case, methanol steam reforming is a leading effective research area, as it is a process with low energy consumption. The results of the steam reforming of methanol on synthesized catalysts by the solution combustion synthesis (SCS), self-propagating high-temperature synthesis (SHS), and moisture impregnation capacity methods are presented. A study was conducted to evaluate the activity of Cu-Ce-Al catalysts with varying ratios of components for hydrogen production, comparing the SCS method with the other mentioned methods. The methanol conversion reached 99% and the selectivity of H2 was 88% at 500 °C. The study showed that the replacement of Al3+ ions with Cu2+ and Ce3+ cations leads to the formation of spinels, such as CuAl2O4 and CeAlO3. As a consequence, the CuAl2O4 and CeAlO3 lattice parameters increase because of the difference in the ionic radii of Al3+ (0.53 Å), Cu2+ (0.73 Å), and Ce3+ (1.07 Å). Advantages of SCS catalysts in the process of the steam reforming of methanol have been demonstrated. The goal of this research is to create a new catalyst for methanol’s conversion into hydrogen-containing fuel mixtures, the production of which, in the future, will be a huge step in the transition to more energy-efficient and environmentally friendly methods of their synthesis.

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Section: Introductionmentioning

confidence: 99%

Methanol Reforming over Cu-Ce-Al Catalysts Prepared by Solution Combustion Synthesis Method

Assylbekov,

Xanthopoulou,

Tungatarova

et al. 2024

Catalysts

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Electrocatalytic Applications in Hydrogen Evolution of Two Nitrogen Heterocyclic Cu(I) Coordination Polymer Modified Electrodes

Wu,

Ma,

Teng

et al. 2024

Applied Organom Chemis

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The development of low‐cost, high‐efficiency, stable, and structurally adjustable electrocatalysts for hydrogen evolution reaction (HER) is of great significance for energy conversion. In this study, two new Cu(I) coordination polymers (CPs), formulated as {[Cu(L1)](PF6)·CH2Cl2}n (1) and {[Cu2(L2)1.5(PPh3)](PF6)2}n (2) (L1 = 1,3‐bis[1‐(pyridin‐3‐ylmethyl) ‐1H‐benzimidazol‐2‐yl]propane, L2 = 1,4‐bis[1‐(3‐pyridylmethyl)‐1H‐benzimidazol‐2‐yl]butane), were synthesized by interfacial diffusion method and characterized by single‐crystal x‐ray diffraction and IR and UV–Vis spectra. Structural analysis shows that the CP‐1 is a one‐dimensional chain structure, whereas the CP‐2 is a two‐dimensional layered structure, which is due to the different coordination modes of ligands L1 (bridging chelation) and L2 (bridging). The electrocatalytic activity for HER of Cu(I) CPs was studied by preparing modified glassy carbon electrodes (CP‐1/GCE and CP‐2/GCE). Electrochemical HER studies manifest that in 0.5 M H2SO4, the overpotential (η10298K) and Tafel slope (b 298K) are −769 mV and 173 mV dec−1 for CP‐1/GCE, −933 mV and 301 mV dec−1 for CP‐2/GCE, and −930 mV and 298 mV dec−1 for bare/GCE, respectively. The η10298K and b298K of CP‐1/GCE were significantly positive shifted and decreased compared with the bare/GCE, indicating that CP‐1/GCE has significant electrocatalytic activity and electrocatalytic HER activity order is CP‐1/GCE > CP‐2/GCE ≈ bare/GCE. This work provides an important reference for the application of non‐noble metal CPs in the field of electrocatalysis.

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Recycled Anode Materials from Manufacturing Industry for Anion Exchange Membrane Water Electrolyzer

Lee,

Jin,

Soh

et al. 2024

Small

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As the energy industries, such as secondary batteries and fuel cells, expand rapidly, the demand for transition metals used as electrode materials is increasing, which has led to a rise in their prices. One promising strategy to address these challenges is upcycling, which involves recycling transition metal‐based waste from various industries. In this study, a heterostructure electrocatalyst for anion exchange membrane water electrolysis is developed by upcycling iron‐based waste from the automotive industry. The iron‐based swarf is converted into single‐phase Fe2O3 by removing surface impurities through calcination in air. Subsequently, NiFe‐LDH is formed via sequential hydrothermal synthesis, resulting in NiFe‐LDH/Fe2O3 heterostructured electrocatalysts. The hetero‐interface between NiFe‐LDH and Fe2O3 significantly reduced the electrochemical activation barrier, enhancing oxygen evolution reaction (OER) activity and, furthermore, achieving high‐performance AEMWE. This approach not only reduces waste but also provides a cost‐effective alternative to traditional materials, highlighting the potential for sustainable and efficient energy solutions.

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Classification and technical target of water electrolysis for hydrogen production

Cited by 23 publications

References 183 publications

Methanol Reforming over Cu-Ce-Al Catalysts Prepared by Solution Combustion Synthesis Method

Methanol Reforming over Cu-Ce-Al Catalysts Prepared by Solution Combustion Synthesis Method

Electrocatalytic Applications in Hydrogen Evolution of Two Nitrogen Heterocyclic Cu(I) Coordination Polymer Modified Electrodes

Recycled Anode Materials from Manufacturing Industry for Anion Exchange Membrane Water Electrolyzer

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