One-step facile hydrothermal synthesis of rGO-CoS2 nanocomposites for high performance HER electrocatalysts

Sekar, Sankar; Devi, S. Brindha; Maruthasalamoorthy, S.; Maiyalagan, T.; Kim, Deuk Young; Navamathavan, R.

doi:10.1016/j.ijhydene.2022.04.069

Cited by 19 publications

(6 citation statements)

References 58 publications

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“…Hydrogen energy [2,3,135,136] is known to have the highest weight-energy density among all the chemical fuels, and among all the methods to produce hydrogen energy, the electrolysis of water for hydrogen production [8,10,11,[137][138][139] is the most promising in green chemistry because it is an environmentally clean process.…”

Section: Hydrogen Evolution Reactionmentioning

confidence: 99%

Two-Dimensional Metal–Organic Frameworks and Their Derivative Electrocatalysts for Water Splitting

Shen,

Qian,

Lyu

et al. 2023

Applied Sciences

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The escalating urgency to mitigate climate change and enhance energy security has prompted heightened exploration of hydrogen production via electrocatalysis as a viable alternative to conventional fossil fuels. Among the myriad of electrocatalysts under investigation, two-dimensional (2D) metal–organic frameworks (MOFs) stand out as a particularly appealing option. Their unique properties, including a large active specific surface area, distinctive pore structure, ample metal active sites, ultra-thin thickness, superior ion transport efficiency, fast electron transfer rate, and the ability to control the morphological synthesis, endow these frameworks with exceptional versatility and promising potential for electrocatalytic applications. In this review, we delineate the structural features and advantages of 2D MOFs and their derivatives. We proceed to summarize the latest advancements in the synthesis and utilization of these materials for electrocatalytic hydrogen evolution reactions (HER) and oxygen evolution reactions (OER). Finally, we scrutinize the potential and challenges inherent to 2D MOFs and their derivatives in practical applications, underscoring the imperative for continued research in this captivating field of electrocatalysis.

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Section: Hydrogen Evolution Reactionmentioning

confidence: 99%

Two-Dimensional Metal–Organic Frameworks and Their Derivative Electrocatalysts for Water Splitting

Shen,

Qian,

Lyu

et al. 2023

Applied Sciences

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“…where E RHE and E 0 SCE mean the standard potential values of the reversible hydrogen electrode and the saturated calomel electrode, respectively. The Tafel slope (S T ) was calculated from the following relationship [60][61][62]:…”

Section: 4mentioning

confidence: 99%

Superb Bifunctional Water Electrolysis Activities of Carbon Nanotube-Decorated Lanthanum Hydroxide Nanocomposites

Sekar,

Park,

Jung

et al. 2023

International Journal of Energy Research

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For highly efficient hydrogen production from electrocatalytic water electrolysis, developing a high-fidelity electrocatalyst is pivotal. Herein, we demonstrated the excellent water-splitting performances of the carbon allotrope-decorated rare earth oxide nanocomposite system, which was composed of lanthanum hydroxide (La(OH)3) and carbon nanotube (CNT). The nanocomposites of CNT-La(OH)3 were fabricated via facile ultrasonication using La(OH)3 nanoparticles and CNT nanofibers, and they exhibited excellent bifunctional water-splitting activities. For the hydrogen evolution reaction, CNT-La(OH)3 showed low values of both overpotential (150 mV) and Tafel slope (113 mV/dec) in 1 M KOH at -10 mA/cm2. Additionally, for the oxygen evolution reaction, CNT-La(OH)3 also displayed small values for their overpotential (310 mV) as well as the Tafel slope (39 mV/dec). Furthermore, both bifunctional hydrogen- and oxygen-evolution reactions were confirmed to be stable in chronopotentiometric tests. From the material characterization and the electrochemical characterization, such excellent bifunctional water electrolysis performances were ascribed to the synergetic effects of hybridization of La(OH)3 (i.e., a large number of electrochemically active sites of 304 cm2) and CNT (i.e., high charge transport conductivity). The results specify that the present CNT-La(OH)3 nanocomposite system possesses ample aptitude as a superior electrocatalyst for next-generation hydrogen production technology.

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“…Water electrolysis consists of two basic half-cell reactions at the anode and the cathode; i.e., the oxygen evolution reaction (OER) takes place at the anode, and in turn, the hydrogen evolution reaction (HER) occurs at the cathode [9][10][11]. For OER and HER, Ir/Ruand Pt-based materials were typically used as electrode materials because of their superior electrocatalytic performances [12][13][14][15]. However, the low natural abundance and the high cost of both novel metal and rare earth material would somewhat restrict their practical applications [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Excellent Bifunctional Water Electrolysis Activities of α-MoO3/AC Nanocomposites

Sekar,

Yun,

Park

et al. 2024

International Journal of Energy Research

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Electrocatalytic water splitting is a cost-effective and environment-friendly technique for producing oxygen and hydrogen through the oxygen/hydrogen evolution reaction (OER/HER). Developing the highly active and stable electrocatalyst, particularly for bifunctional water electrolysis (i.e., both OER and HER), is still a formidable challenge. Herein, we demonstrated the enhanced bifunctional water splitting activities by utilizing the molybdenum trioxide-anchored activated carbon (MoO3/AC) nanocomposites. The MoO3/AC samples were fabricated by the ultrasonication method using sol-gel synthesized MoO3 and biomass-derived AC, and they displayed a nanostreusel-like morphology with spherical MoO3 nanoparticle-decorated AC nanosheets. For the water electrolysis test, the MoO3/AC nanocomposites exhibited the excellent bifunctional electrocatalytic OER and HER performances with low overpotential and small Tafel slope values. Through analyzing the material characteristics and the electrochemical properties of MoO3/AC, it was found that the superb bifunctional OER-HER activities were attributed to the synergistic effects from the hybridization of highly conductive AC and electrochemically active α-MoO3. The results pronounce that the MoO3/AC nanocomposites possess an aptitude as a superb bifunctional OER/HER electrocatalyst for high-performance water electrolysis.

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One-step facile hydrothermal synthesis of rGO-CoS2 nanocomposites for high performance HER electrocatalysts

Cited by 19 publications

References 58 publications

Two-Dimensional Metal–Organic Frameworks and Their Derivative Electrocatalysts for Water Splitting

Two-Dimensional Metal–Organic Frameworks and Their Derivative Electrocatalysts for Water Splitting

Superb Bifunctional Water Electrolysis Activities of Carbon Nanotube-Decorated Lanthanum Hydroxide Nanocomposites

Excellent Bifunctional Water Electrolysis Activities of α-MoO3/AC Nanocomposites

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