High-performance corrosion-resistant fluorine-doped tin oxide as an alternative to carbon support in electrodes for PEM fuel cells

Kim, Jong Min; Lee, Yeo Jin; Kim, Seunghoon; Chae, Keun-Hwa; Yoon, Ki Ro; Lee, Kyung Ah; Byeon, Ayeong; Kang, Yun Sik; Park, Hee-Young; Cho, Min Kyung; Ham, Hyung Chul; Kim, Jin Young

doi:10.1016/j.nanoen.2019.104008

Cited by 38 publications

(13 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure b shows that the ABEEPO with RuO 2 , PtRu black, and Pt/C as the anode materials exhibited poor durability, and the current densities were sharply decreased by 75, 60, and 86% in 2 h. Pt/C has the highest relative drop of current density. The instability for RuO 2 , PtRu black, and Pt/C may be ascribed to the oxidation of surface RuO 2 to water-soluble RuO 4 , − the dissolution of Ru in acidic medium, − and low electrochemical oxidation resistance of Pt in acidic medium, , respectively. In contrast, the ABEEPO with IrO 2 as the anode material exhibited high stability in 2 h, and the current density only decreased by 12%.…”

Section: Resultsmentioning

confidence: 99%

Ultralight, Safe, Economical, and Portable Oxygen Generators with Low Energy Consumption Prepared by Air-Breathing Electrochemical Extraction

Gao

Ning

et al. 2022

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Pure oxygen is vital in medical treatment, first aid, and chemical synthesis. Hypoxia can cause severe damage to the organ systems such as respiratory, digestive, and nervous systems and even directly cause death. Notably, the severe Coronavirus disease 2019 (COVID-19) pandemic has exacerbated the shortage of medical oxygen in the world. Hence, a safe, economical, and portable oxygen supply device is urgently needed. Here, we have successfully prepared a device with air-breathing electrochemical extraction of pure oxygen (ABEEPO) with light weight and high energy efficiency. By renovating the structure of the electrolytic cell, the components bipolar plate and end plate are replaced with a plastic membrane, and the component current collector is replaced with a highly conductive graphene composite membrane electrode. Due to the use of the plastic membrane and graphene composite membrane electrode, the weight of the electrolytic cell is reduced from 1319.4 to 1.6 g, and the flexibility of the electrolytic cell is successfully realized. Through optimizing anode catalysts, working area, and operating voltage, a high flow rate per mass (234 mL h −1 g −1 ) was achieved at a voltage of 1.2 V. The device exhibits high stability in 2 h. The new portable oxygen production device would be effective for hypoxia treatment.

show abstract

Section: Resultsmentioning

confidence: 99%

Ultralight, Safe, Economical, and Portable Oxygen Generators with Low Energy Consumption Prepared by Air-Breathing Electrochemical Extraction

Gao

Ning

et al. 2022

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…31 Using the optimized bulk unit cell, a five-layered (1 × 2) Cu 2 S(110) slab model was then prepared and isolated from its periodic images in the vertical direction by the vacuum distance corresponding to seven atomic layers (Figure S1). 32 While the bottom two layers were fixed at corresponding bulk positions, the upper three layers were fully relaxed using the conjugate gradient method until the residual forces on all atoms become smaller than 2 × 10 −2 eV/Å.…”

Section: Acs Catalysismentioning

confidence: 99%

Sacrificial Dopant to Enhance the Activity and Durability of Electrochemical N₂ Reduction Catalysis

et al. 2022

Self Cite

View full text Add to dashboard Cite

Electrochemical nitrogen reduction reaction (eNRR) is a promising alternative to the Haber–Bosch process for environmentally sustainable ammonia synthesis. However, the reduction of the dinitrogen molecule to ammonia is known for its extremely sluggish kinetics, and the catalytic activity and selectivity of eNRR catalysts remain significantly low for practical deployment of the technology. Herein, a sacrificial dopant for eNRR catalysts is introduced in order to improve the activity and durability of the electrochemical N2 reduction catalysis. Specifically, iridium-doped mesoporous copper sulfide hexagonal prism nanoparticles provide an ammonia production yield of 18.2 ± 0.8 μg/h cm2 at −0.6 VRHE and a Faradaic efficiency of 2.4 ± 0.1% in neutral aqueous electrolytes. The dopant modifies the electronic states of the eNRR active site to achieve appropriate *N2H and *H adsorption energies. The doping process also results in an increased active surface area of catalyst particles along with a 3-fold increase in durability compared to the undoped copper sulfide, thus further enhancing the eNRR activity. Last, the developed eNRR catalyst is employed in a practical ammonia production device displaying a production yield of 1.1 μgNH3 /h cm2 at 1.8 Vcell. The present results suggest a design factor to enhance the catalyst durability, that is, by the introduction of a sacrificial dopant, in the development of efficient eNRR catalysts for electrochemical ammonia production.

show abstract

“…SnO 2 served as the earth-rich semiconductor with strong corrosion resistance and weak hydrogen adsorption, which has raised considerable interest in the field of N 2 reduction. , To date, SnO 2 catalysts have been widely reported for photocatalytic NRR, but their electrocatalytic applications are greatly limited due to the poor electrical conductivity and low catalytic activity. , It has been proven that coupling another metal can be an effective route to improve the conductivity and regulate the electron distribution, further enhancing the electrocatalytic performance . Transition metals, such as Rh, Ru, Au, Ag, Cu, Co, Fe etc., have been reported to be the catalytically active centers toward electrocatalytic N 2 reduction. − The positive NRR activity of transition-metal-based catalysts mainly results from their abundantly occupied d-orbital electrons for π-back donation of N 2 molecules, which benefits in stimulating the adsorption and activation of N 2 molecules .…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Interfacial Electron Regulation of Rh Atomic Layer-Decorated SnO₂ Heterostructures for Enhancing Electrocatalytic Nitrogen Reduction

Liu

Huang

Fang

et al. 2022

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Ammonia (NH3), which serves as a fertilizer supply, is struggling to satisfy the ever-growing population requirements over the world. The electrocatalytic nitrogen reduction to NH3 production is highly desired but shows the extremely poor activity and selectivity of reported electrocatalysts. In this work, we rationally design a novel Rh atomic layer-decorated SnO2 heterostructure catalyst through the interfacial engineering strategy, simultaneously achieving the highest NH3 yield rate (149 μg h–1 mgcat –1) and Faradaic efficiency (11.69%) at −0.35 V vs the reversible hydrogen electrode. This result is superior to the optimum response of previously reported SnO2- or Rh-based catalysts for electrochemical nitrogen reduction. Both X-ray absorption spectra characterization and density functional theory calculations reveal the strong electron interaction between the Rh atomic layer and the SnO2 heterostructure, which effectively regulated the interfacial electron transfer and d-band center. The downshift of the d-band center results in the greatly reduced H adsorption energy and the highly accelerated reaction kinetics for nitrogen reduction. This work endows a new insight into the interfacial electron regulation for weakening H adsorption and further enhancing the electrocatalytic N2 reduction.

show abstract

High-performance corrosion-resistant fluorine-doped tin oxide as an alternative to carbon support in electrodes for PEM fuel cells

Cited by 38 publications

References 44 publications

Ultralight, Safe, Economical, and Portable Oxygen Generators with Low Energy Consumption Prepared by Air-Breathing Electrochemical Extraction

Ultralight, Safe, Economical, and Portable Oxygen Generators with Low Energy Consumption Prepared by Air-Breathing Electrochemical Extraction

Sacrificial Dopant to Enhance the Activity and Durability of Electrochemical N₂ Reduction Catalysis

Interfacial Electron Regulation of Rh Atomic Layer-Decorated SnO₂ Heterostructures for Enhancing Electrocatalytic Nitrogen Reduction

Contact Info

Product

Resources

About

High-performance corrosion-resistant fluorine-doped tin oxide as an alternative to carbon support in electrodes for PEM fuel cells

Cited by 38 publications

References 44 publications

Ultralight, Safe, Economical, and Portable Oxygen Generators with Low Energy Consumption Prepared by Air-Breathing Electrochemical Extraction

Ultralight, Safe, Economical, and Portable Oxygen Generators with Low Energy Consumption Prepared by Air-Breathing Electrochemical Extraction

Sacrificial Dopant to Enhance the Activity and Durability of Electrochemical N2 Reduction Catalysis

Interfacial Electron Regulation of Rh Atomic Layer-Decorated SnO2 Heterostructures for Enhancing Electrocatalytic Nitrogen Reduction

Contact Info

Product

Resources

About

Sacrificial Dopant to Enhance the Activity and Durability of Electrochemical N₂ Reduction Catalysis

Interfacial Electron Regulation of Rh Atomic Layer-Decorated SnO₂ Heterostructures for Enhancing Electrocatalytic Nitrogen Reduction