Superior performance of anion exchange membrane water electrolyzer: Ensemble of producing oxygen vacancies and controlling mass transfer resistance

Park, Yoo Sei; Yang, Juchan; Lee, Jong‐Min; Jang, Myeong Je; Jeong, Jaehoon; Choi, Woosung; Kim, Jae Won; Yin, Yadong; Seo, Min Ho; Chen, Zhongwei; Choi, Sung Mook

doi:10.1016/j.apcatb.2020.119276

Cited by 105 publications

(65 citation statements)

References 77 publications

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“…As global warming is accelerating due to the use of fossil fuels and a variety of environmental problems, renewable energy technology has attracted the attention of the modern society worldwide [1][2][3][4] . Fuel cells are a promising next-generation renewable energy technology to replace conventional fossil-fuel devices because they directly utilize electrochemical reactions to convert chemical energy into electrical energy, generating clean water and heat as byproducts ( Supplementary Fig.…”

Section: Introductionmentioning

confidence: 99%

WITHDRAWN: Corrosion resistant fluorine-doped graphene nanoribbons for an highly durable PEMFC: combined experiment and ab-initio studies

Jin¹,

Sy²,

Lee³

et al. 2020

Preprint

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Pt-supported carbon material-based electrocatalysts are formidably suffering from carbon corrosion when H2O and O2 molecules are present at high voltages in PEMFC. In this study, we discovered that the edge site of a fluorine-doped graphene nanoribbon (F-GNR) was slightly adsorbed with H2O and thermodynamically unfavorable with O atoms after defining the thermodynamically stable structure of F-GNR from DFT calculations. Based on computational predictions, the physicochemical and electrochemical properties of F-GNRs with/without Pt nanoparticles derived from a modified Hummer’s method and the polyol process were investigated as support materials for electrocatalysts and additives in the cathode of a PEMFC, respectively. Pt/F-GNR showed the lowest degradation rate in carbon corrosion, and was effective in the cathode as additives, resulting from the enhanced carbon corrosion durability owing to the improved structural stability and water management. Notably, F-GNR with highly stable carbon corrosion contributed to achieving a more durable PEMFC for long-term operation.

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Section: Introductionmentioning

confidence: 99%

WITHDRAWN: Corrosion resistant fluorine-doped graphene nanoribbons for an highly durable PEMFC: combined experiment and ab-initio studies

Jin¹,

Sy²,

Lee³

et al. 2020

Preprint

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“…Figure 5 e shows the wettability of the NiFe-LDH pyramid electrode and the NiFe-LDH/Cu foil. In general, the hydrophilicity of the electrode surface is very advantageous for improving the mass transport in water splitting 11 , 12 , 47 . The contact angle of 62° for the NiFe-LDH pyramids was lower than 97° for the NiFe-LDH/Cu foil, indicating the hydrophilicity enhancement of the electrode due to geometrical effect.…”

Section: Resultsmentioning

confidence: 99%

“…Determining suitable processing parameters that can greatly decrease the η value and consequently promote the reaction rate and total cell efficiency is crucial in the water splitting process 9 , 10 . In previous reports, nanostructured and porous electrocatalysts with larger surface areas increased the number of active sites and contributed to alleviating the η value caused by the resistance of ions, gas diffusion, and charge transfer 11 , 12 . An effective approach for improving the performance of water electrolysis is to increase the total electrocatalyst–electrolyte interfacial active area by using a three-dimensional (3D) geometrical electrode coated with rational nanostructured electrocatalysts 13 – 16 .…”

Section: Introductionmentioning

confidence: 91%

3D-printed NiFe-layered double hydroxide pyramid electrodes for enhanced electrocatalytic oxygen evolution reaction

Ahn

Park

Lee

et al. 2022

Sci Rep

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Electrochemical water splitting has been considered one of the most promising methods of hydrogen production, which does not cause environmental pollution or greenhouse gas emissions. Oxygen evolution reaction (OER) is a significant step for highly efficient water splitting because OER involves the four electron transfer, overcoming the associated energy barrier that demands a potential greater than that required by hydrogen evolution reaction. Therefore, an OER electrocatalyst with large surface area and high conductivity is needed to increase the OER activity. In this work, we demonstrated an effective strategy to produce a highly active three-dimensional (3D)-printed NiFe-layered double hydroxide (LDH) pyramid electrode for OER using a three-step method, which involves direct-ink-writing of a graphene pyramid array and electrodeposition of a copper conducive layer and NiFe-LDH electrocatalyst layer on printed pyramids. The 3D pyramid structures with NiFe-LDH electrocatalyst layers increased the surface area and the active sites of the electrode and improved the OER activity. The overpotential (η) and exchange current density (i0) of the NiFe-LDH pyramid electrode were further improved compared to that of the NiFe-LDH deposited Cu (NiFe-LDH/Cu) foil electrode with the same base area. The 3D-printed NiFe-LDH electrode also exhibited excellent durability without potential decay for 60 h. Our 3D printing strategy provides an effective approach for the fabrication of highly active, stable, and low-cost OER electrocatalyst electrodes.

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“…Conversely, nonnoble-metal based OER electrocatalysts are less costly and more abundant. However, under acidic pH conditions they are susceptible to corrosion and often show poor catalytic activity (Jiang et al, 2019;Park et al, 2020b). Given that the economy of hydrogen production via electrolysis is primarily based on catalytic activity rather than on the cost of the catalyst employed (Kanan and Nocera, 2008;Dinca et al, 2010), noble-metal catalysts, such as Ir-or Ru-based catalysts, which are very rare, account for a high proportion of OER electrocatalysts (Smith et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Electrodeposition of High-Surface-Area IrO2 Films on Ti Felt as an Efficient Catalyst for the Oxygen Evolution Reaction

et al. 2020

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Under acidic conditions, IrO 2 exhibits high catalytic activity with respect to the oxygen evolution reaction (OER). However, the practical application of Ir-based catalysts is significantly limited owing to their high cost in addition to the scarcity of the metal. Therefore, it is necessary to improve the efficiency of the utilization of such catalysts. In this study, IrO 2-coated Ti felt (IrO 2 /Ti) electrodes were prepared as high-efficiency catalysts for the OER under acidic conditions. By controlling the surface roughness of the Ti substrate via wet etching, the optimum Ti substrate surface area for application in the IrO 2 /Ti electrode was determined. Additionally, the IrO 2 film that was electrodeposited on the 30 min etched Ti felt had a large surface area and a uniform morphology. Furthermore, there were no micro-cracks and the electrode obtained (IrO 2 /Ti-30) exhibited superior catalytic performance with respect to the OER, with a mass activity of 362.3 A g −1 Ir at a potential of 2.0 V (vs. RHE) despite the low Ir loading (0.2 mg cm −2). Therefore, this proposed strategy for the development of IrO 2 /Ti electrodes with substrate surface control via wet etching has potential for application in the improvement of the efficiency of catalyst utilization with respect to the OER.

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Superior performance of anion exchange membrane water electrolyzer: Ensemble of producing oxygen vacancies and controlling mass transfer resistance

Cited by 105 publications

References 77 publications

WITHDRAWN: Corrosion resistant fluorine-doped graphene nanoribbons for an highly durable PEMFC: combined experiment and ab-initio studies

WITHDRAWN: Corrosion resistant fluorine-doped graphene nanoribbons for an highly durable PEMFC: combined experiment and ab-initio studies

3D-printed NiFe-layered double hydroxide pyramid electrodes for enhanced electrocatalytic oxygen evolution reaction

Electrodeposition of High-Surface-Area IrO2 Films on Ti Felt as an Efficient Catalyst for the Oxygen Evolution Reaction

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