Graphitic carbon nitride-carbon nanofiber as oxygen catalyst in anion-exchange membrane water electrolyzer and rechargeable metal–air cells

Park, Ji‐Eun; Kim, Mi-Ju; Lim, Myung Su; Kang, Sun Kil; Kim, Jong-Kwan; Oh, Seung-Hyeon; Her, Min; Cho, Young-Hun; Sung, Yung‐Eun

doi:10.1016/j.apcatb.2018.05.073

Cited by 69 publications

(32 citation statements)

References 42 publications

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“…AEM water electrolyzer systems, which possess the advantages of both AWE and PEM water electrolyzer systems without their weak points, can produce high‐purity hydrogen using an anion exchange membrane as a solid polymer electrolyte. [ 18–22 ] They can operate in an alkaline environment, allowing the use of non‐noble metal catalysts. [ 18–22 ] However, the performance of AEM water electrolyzer systems (200–400 mA cm −2 at 1.8–2.4 V) is lower than that of PEM water electrolyzer systems (600–2000 mA cm −2 at 1.8–2.2 V).…”

Section: Introductionmentioning

confidence: 99%

“…[ 18–22 ] They can operate in an alkaline environment, allowing the use of non‐noble metal catalysts. [ 18–22 ] However, the performance of AEM water electrolyzer systems (200–400 mA cm −2 at 1.8–2.4 V) is lower than that of PEM water electrolyzer systems (600–2000 mA cm −2 at 1.8–2.2 V). [ 23,24 ] This can be attributed to the poor OER performance of non‐noble metal based electrocatalysts.…”

Section: Introductionmentioning

confidence: 99%

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High‐Efficiency Anion‐Exchange Membrane Water Electrolyzer Enabled by Ternary Layered Double Hydroxide Anode

Lee

Jung

Park

et al. 2021

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Developing high‐efficiency and low‐cost oxygen‐evolving electrodes in anion exchange membrane (AEM) water electrolysis technology is one of the major challenges. Herein, it is demonstrated that the surface corrosion of a conventional Ni foam electrode in the presence of Fe3+ and V3+ cations can transform it into an electrode with a high catalytic performance for oxygen evolution reaction (OER). The corroded electrode consists of a ternary NiFeV layered double hydroxide (LDH) nanosheet array supported on the Ni foam surface. This NiFeV LDH electrode achieves an OER current density of 100 mA cm−2 at an overpotential of 272 mV in 1 m KOH, outperforming the IrO2 catalyst by 180 mV. Density functional theory calculations reveal that the unique structure and the presence of vanadium in NiFeV LDH play a key role in achieving improved OER activity. When coupled with a commercial Pt/C cathode catalyst, the resulting AEM water electrolyzer achieves a cell current density as high as 2.1 A cm−2 at a voltage of only 1.8 Vcell in 1 m KOH, which is similar to the performance of the proton exchange membrane water electrolyzer obtained from the IrO2 and Pt/C catalysts pair.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High‐Efficiency Anion‐Exchange Membrane Water Electrolyzer Enabled by Ternary Layered Double Hydroxide Anode

Lee

Jung

Park

et al. 2021

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“…Such a low overpotential is comparable to the state‐of‐the‐art OER catalysts such as IrO 2 , RuO 2 and transition metal based catalysts . The OER parameters of typical catalysts in 1.0 mol L −1 KOH are listed in Table . This result indicates the possibility of designing highly active OER photo‐responsive electrocatalysts with earth‐abundant non‐metallic elements.…”

Section: Resultsmentioning

confidence: 70%

In situ construction of hierarchical graphitic carbon nitride homojunction as robust bifunctional photoelectrocatalyst for overall water splitting

Luo

Zhang

Han

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND: Sustainable production of oxygen and hydrogen via catalyst-aided water splitting utilizing solar energy has attracted increasing interest. The primary issue in this field is the development of earth-abundant and active photoelectrocatalytic materials. Herein, a novel hierarchical g-C 3 N 4 /g-C 3 N 4 metal-free homojunction catalyst is synthesized through partial hydrolysis of melamine in alkali and subsequent thermal treatment.RESULTS: The hierarchical g-C 3 N 4 /g-C 3 N 4 metal-free homojunction composed of lamellas features large exposed surface area, abundant interface contact and more channels for mass transfer, making it highly effective for water splitting with a small overpotential of 500 mV at 10 mA cm −2 and low Tafel slope of 93.1 mV dec −1 for oxygen evolution reaction (OER) in 1.0 mol L −1 potassium hydroxide (KOH) solution, as well as 259 mV at 10 mA cm −2 and 109.33 mV dec −1 for hydrogen evolution reaction (HER) in 0.5 mol L −1 sulfuric acid (H 2 SO 4 ) solution. Furthermore, the overpotential and Tafel slope further decrease to 383.4 mV and 69.52 mV dec −1 for OER, 150.1 mV and 67.93 mV dec −1 for HER upon visible light irradiation, demonstrating the exceptional photo-responsive catalytic performance, which can be attributed to the direct Z-scheme homojunction resulting in effective charge transfer and •OH and superoxide free radicals produced under visible light irradiation.CONCLUSION: This work provides a facile but effective approach for the construction of metal-free OER/HER bifunctional catalyst with high photo-responsive performance, achieving higher activity for catalyst-assisted water splitting.

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“…51 In terms of bifunctional catalysis (OER/ORR), the design and choice of catalysts are nearly identical between alkaline fuel cells and aqueous MABs. [55][56][57] The performance of bifunctional catalysts takes into account both the ORR and OER direction of reaction. Instead of a single onset potential, the performance index of (D) Output from calculations showing that a catalyst optimization process of moving up the volcano plot, or optimized within the constraints of the linear scaling relationship (d optimized) followed by moving beyond the volcano plot, or optimized without the constraints of the liner scaling relationship (ε optimized) is optimal.…”

Section: Alkaline Mediamentioning

confidence: 99%

Relating Catalysis between Fuel Cell and Metal-Air Batteries

Wang

et al. 2020

Matter

131

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With the ever-increasing demand for higher-performing energy-storage systems, electrocatalysis has become a major topic of interest in an attempt to enhance the electrochemical performance of many electrochemical technologies. Discoveries pertaining to the oxygen reduction reaction catalyst helped enable the commercialization of fuel-cell-based electric vehicles. However, a closely related technology, the metal-air battery, has yet to find commercial application. Much like the Li-ion battery, metal-air batteries can potentially utilize the electrical grid network for charging, bypassing the need for establishing a hydrogen infrastructure. Among the metal-air batteries, Li-air and Zn-air batteries have drawn much interest in the past decade. Unfortunately, state-of-the art metal-air batteries still produce performances that are well below practical levels. In this brief perspective, we hope to bridge some of the ideas from fuel cell to that of metal-air batteries with the aim of inspiring new ideas and directions for future research.

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Graphitic carbon nitride-carbon nanofiber as oxygen catalyst in anion-exchange membrane water electrolyzer and rechargeable metal–air cells

Cited by 69 publications

References 42 publications

High‐Efficiency Anion‐Exchange Membrane Water Electrolyzer Enabled by Ternary Layered Double Hydroxide Anode

High‐Efficiency Anion‐Exchange Membrane Water Electrolyzer Enabled by Ternary Layered Double Hydroxide Anode

In situ construction of hierarchical graphitic carbon nitride homojunction as robust bifunctional photoelectrocatalyst for overall water splitting

Relating Catalysis between Fuel Cell and Metal-Air Batteries

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