Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 501, P. 157603 - 157603
Published: Nov. 12, 2024
Language: Английский
Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 501, P. 157603 - 157603
Published: Nov. 12, 2024
Language: Английский
ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(27), P. 35200 - 35207
Published: June 27, 2024
Developing robust oxygen evolution reaction (OER) electrocatalysts is crucial for advancing anion exchange membrane water electrolysis (AEMWE). In this study, we present a catalyst optimizing the synergistic effect of Co and Fe by creating CoFe-based layer on Fe-based electrode (Fe@CoFe). The Fe@CoFe exhibits an overpotential 168 mV at 10 mA cm–2 under half-cell conditions current density A 2 V in AEMWE system with 1 M KOH. Moreover, it showcases degradation rate 76 μV h–1 2000 h 500 single-cell system. This study demonstrates feasibility achieving efficient durable using transition metal-based exclusively fabricated via electrodeposition.
Language: Английский
Citations
11Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(48)
Published: July 15, 2024
Abstract The high‐performance anion exchange membranes (AEMs) are developed by incorporating 9,9′‐spirobifluorene as a 3D branching agent, addressing the common trade‐off between ion conductivity and dimensional/mechanical stability. By fine‐tuning ratio of terphenyl to biphenyl amount AEM is refined, achieving high (≈190 mS cm −1 at 80 °C in 1 m KOH) with decent properties, comparable recently reported state‐of‐the‐art membranes. Investigations using gas pycnometer atomic force microscopy demonstrated that spirobifluorene enhances fractional free volume around membrane's backbone more precisely modulates separation hydrophobic hydrophilic domains, thus boosting both mechanical This membrane also displayed excellent chemical stability, negligible degradation KOH over 1,000 h. With such membrane, an cell performance achieved, current density 11.2 A − 2 V KOH, 1.8 pure water conditions. situ stability test, conducted constant for 500 h, showed no significant degradation.
Language: Английский
Citations
10ACS Energy Letters, Journal Year: 2025, Volume and Issue: 10(1), P. 620 - 628
Published: Jan. 3, 2025
Polymeric ionomers near the catalyst surface of CO2 reduction reaction (CO2RR) electrodes affect their efficiency; however, multifaceted properties complicate structure–activity relationship elucidation. Here, we synthesized polycarbazole-based anion-exchange (QPC) bearing varying functionalized side chains to explore this relationship. Comprehensive analysis in physicochemical properties, electrochemical activity, and operando ATR-SEIRAS revealed that functional group modification significantly influenced intrinsic ionomer thereby affecting Ag microenvironments interfacial water structures, kinetics protonation step for CO2RR hydrogen evolution (HER). Notably, QPC-trimethyl phosphonium (TMP) induced favorable having a high proportion strong H-bonded with low Stark tuning slopes, which inhibit HER promote CO2RR. A CO Faradaic efficiency (>90%) was maintained using QPC-TMP membrane electrode assembly, even under concentrations (100–15%) elevated temperatures (28–72 °C). These findings suggest catalytic environment can be optimized by fine-tuning structure, contributing advancement high-performance ionomers.
Language: Английский
Citations
2Energies, Journal Year: 2024, Volume and Issue: 17(17), P. 4514 - 4514
Published: Sept. 9, 2024
The use of green hydrogen as a high-energy fuel the future may be an opportunity to balance unstable energy system, which still relies on renewable sources. This work is comprehensive review recent advancements in production. outlines current consumption trends. It presents tasks and challenges economy towards hydrogen, including production, purification, transportation, storage, conversion into electricity. main types water electrolyzers: alkaline electrolyzers, proton exchange membrane solid oxide anion electrolyzers. Despite higher production costs compared grey this suggests that technologies become cheaper more efficient, cost expected decrease. highlights need for cost-effective efficient electrode materials large-scale applications. concludes by comparing operating parameters considerations different electrolyzer technologies. sets targets 2050 improve efficiency, durability, scalability underscores importance ongoing research development address limitations technology make competitive with fossil fuels.
Language: Английский
Citations
7Applied Sciences, Journal Year: 2025, Volume and Issue: 15(3), P. 1495 - 1495
Published: Feb. 1, 2025
This study investigates the development of pore-filling anion-exchange membranes (PFAEMs) for water-electrolysis applications. Ionomers using two different cross-linking monomers, namely hydrophilic C10 and hydrophobic C11, along with a common electrolyte monomer, E3, were compared in terms through-plane ion conductivity, hydrogen permeability, mechanical chemical stability, I-V polarization, durability. The results revealed that E3-C10 PFAEM exhibited 40% higher OH− conductivity (98.7 ± 7.0 mS cm−1) than E3-C11 similar ion-exchange capacity. improvement was attributed to improved separation domains, creating well-connected channels by C10. Alkaline stability tests demonstrated retained E3-C11, due absence ether linkages increased resistance nucleophilic attack. During operations, PFAEMs showed 10% better durability 87% lower confirming their suitability anion-exchange-membrane water electrolysis (AEMWE). Despite PFAEM, performance limited interfacial resistance. It is suggested ionomer-coated electrodes could further enhance AEMWE leveraging E3-C10. Overall, this provides valuable guidance on strategies utilizing electrolysis.
Language: Английский
Citations
1ACS Energy Letters, Journal Year: 2025, Volume and Issue: unknown, P. 1633 - 1641
Published: March 12, 2025
Language: Английский
Citations
1Materials Today Communications, Journal Year: 2025, Volume and Issue: unknown, P. 112242 - 112242
Published: March 1, 2025
Language: Английский
Citations
1Advanced Materials, Journal Year: 2025, Volume and Issue: unknown
Published: April 14, 2025
Abstract Single‐atom site electrocatalysts (SACs), with maximum atom efficiency, fine‐tuned coordination structure, and exceptional reactivity toward catalysis, energy, environmental purification, have become the emerging frontier in recent decade. Along significant breakthroughs activity selectivity, limited stability durability of SACs are often underemphasized, posing a grand challenge meeting practical requirements. One pivotal obstacle to construction highly stable is heavy reliance on empirical rather than rational design methods. A comprehensive review urgently needed offer concise overview progress stability/durability, encompassing both deactivation mechanism mitigation strategies. Herein, this first critically summarizes degradation induction factors at atomic‐, meso‐ nanoscale, mainly based but not oxygen reduction reaction. Subsequently, potential stability/durability improvement strategies by tuning catalyst composition, morphology surface delineated, including robust substrate metal‐support interaction, optimization active stability, fabrication porosity modification. Finally, challenges prospects for discussed. This facilitates fundamental understanding provides efficient principles aimed overcoming difficulties beyond.
Language: Английский
Citations
1Journal of Membrane Science, Journal Year: 2025, Volume and Issue: unknown, P. 124206 - 124206
Published: May 1, 2025
Language: Английский
Citations
1Advanced Energy Materials, Journal Year: 2024, Volume and Issue: unknown
Published: Sept. 29, 2024
Abstract Alkaline‐stable, highly conductive anion exchange membranes (AEMs) are attentively expected solid polymer electrolytes that contribute to achieving high performance and durability for membrane water electrolyzers (AEMWEs). The technical challenges of AEMs mainly stem from the degradation backbones, side chains, anchoring cationic groups. Herein, new stable (QTAF) designed using 3,3′′‐dichloro‐2′,5′‐bis(trifluoromethyl)‐1,1′:4′,1′′‐terphenyl (TFP) monomers as hydrophobic component incorporated into polyphenylene backbone 3,3′‐(2,7‐dichloro‐9H‐fluorene‐9,9‐diyl)bis(N,N‐dimethylpropane‐1‐amine) (AF) hydrophilic component. After tuning copolymer composition, highest hydroxide ion conductivity (168.7 mS cm −1 at 80 °C) is achieved with QTAF‐3.0 membrane. survives in harsh alkaline conditions (8 M KOH solution, °C), (75.8 ) after 810 h. A electrolysis cell non‐noble Ni 0.8 Co 0.2 O anode catalyst operates stably a constant current density (1.0 −2 1000 h negligible voltage increase rate 1.1 µV initial increase. post‐tested 1.83 V, only 6.4% 2.0 , suggesting potential practical AEMWE applications.
Language: Английский
Citations
4