High-valent iron single-atom catalysts for improved overall water splitting <i>via</i> a reduced energy barrier and stabilization of the active center

Shankar, Ayyavu; Marimuthu, Sundaramoorthy; Maduraiveeran, Govindhan

doi:10.1039/d3ta05863h

Cited by 14 publications

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“…Carbon neutrality has become a crucial subject due to the need for alternatives to fossil fuels to address global warming and environmental damage. , Fuel cells (FCs) and rechargeable metal-air batteries (MABs) are essential components of the renewable energy system due to their exceptional efficiency, high power density, dependability, and environmentally beneficial nature. , Both the FCs and MABs share the cathodic reaction of oxygen reduction reaction (ORR), which is a crucial reaction that determines the rate due to its slow kinetics . Hence, creating highly efficient ORR electrocatalysts is crucial for their broad use.…”

Section: Introductionmentioning

confidence: 99%

Potent Noble Metal–Nickel Oxide Interaction: A Strategy for Improved Oxygen Reduction Reaction via Engineering the Electronic Structure

Yabesh,

Marimuthu,

Maduraiveeran

2024

J. Phys. Chem. C

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Design of both efficient and durable electrode materials is key for oxygen reduction reaction (ORR) in influencing the efficacy of both fuel cells (FCs) and metal-air batteries (MABs). Here, we demonstrate the uniform dispersion of noble metals like (Au), palladium (Pd), and platinum (Pt) on nickel oxide on nickel electrodes (NM@NiO|Ni) for promoting ORR under alkaline electrolytes through engineering the electronic structures of noble metals as active sites. The NM@NiO|Ni electrodes are fabricated using acid etching followed by the galvanic replacement reaction method. Nickel oxide functions as an appropriate and encouraging support that can intensely interact with noble metals for both high catalytic activity and stability improvement. The Pd@NiO|Ni electrode exhibits prominent electrocatalytic ORR performance with an onset potential (E onset ) of ∼0.98 V [vs. reversible hydrogen electrode (RHE)], reduction potential (E) of ∼0.88 V (vs. RHE), catalytic cathodic current density of ∼−0.125 mA cm −2 at ∼0.88 V (vs. RHE), and mass activity of ∼0.38 Ag −1 in 0.1 M KOH, among the other developed electrodes in this study. The introduction of Pd as a second constituent to the NiO nanostructures enhanced the ORR performance expressively. The synergistic effects of Pd and Ni seem to possess a key impact on both catalytic ORR activity and stability. This strategy for enriching the catalytic active sites and the durability of the electrocatalysts demonstrates great potential for FC and MAB applications.

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Section: Introductionmentioning

confidence: 99%

Potent Noble Metal–Nickel Oxide Interaction: A Strategy for Improved Oxygen Reduction Reaction via Engineering the Electronic Structure

Yabesh,

Marimuthu,

Maduraiveeran

2024

J. Phys. Chem. C

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Unlocking Performance: The Transformative Influence of Single Atom Catalysts on Advanced Lithium‐Sulfur Battery Design

Maiti,

Curnan,

Kim

et al. 2024

Advanced Energy Materials

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Theoretically, lithium–sulfur (Li‐S) batteries are highly promising candidates for renewable energy applications, given their scalable energy density and low cost. However, their current practical performance is limited below theoretical expectations, despite attempts to accommodate volumetric expansion and improve electrical conductivity with porous S‐anchoring supports. Battery performance is primarily rate‐limited by the sluggish redox and conversion reaction kinetics of lithium polysulfides (LiPS), which respectively transform into lithium sulfide (Li2S) and elemental S through charging and discharging galvanostatic cycles. Given their strong electrocatalytic performance and other pertinent benefits, recent research highlights single‐atom catalysts (SACs) as candidates for enhancing Li‐S batteries. Thus, this review summarizes contemporary advancements regarding SAC implementation in Li‐S batteries, primarily emphasizing catalyst morphology, battery performance, and mechanistic elucidation. More specifically, separators and cathodes can be engineered via SACs to better anchor LiPS and improve their reductive kinetics, thereby inhibiting the “shuttle effect” known to impact Li‐S batteries. In addition, SACs can be modulated with functional groups to synergistically improve performance, enabling higher S loadings and redistributing transferred charge. Overall, SACs conspicuously boost Li‐S battery performance, justifying further research toward their implementation in Li‐S batteries.

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Modulating Electronic Structure of Iridium Single‐Atom Anchored on 3D Fe‐Doped β‐Ni(OH)₂ Catalyst with Nanopyramid Array Structure for Enhanced Oxygen Evolution Reaction

Kang,

Qiao,

Jia

et al. 2024

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Developing high‐performance electrocatalysts for oxygen evolution reaction (OER) is crucial in the pursuit of clean and sustainable hydrogen energy, yet still challenging. Herein, a spontaneous redox strategy is reported to achieve iridium single‐atoms anchored on hierarchical nanosheet‐based porous Fe doped β‐Ni(OH)2 pyramid array electrodes (SAs Ir/Fe‐β‐Ni(OH)2), which exhibits high OER performance with a low overpotential of 175 mV at 10 mA cm−2 and a remarkable OER current density in alkaline electrolyte, surpassing Fe‐β‐Ni(OH)2/NF and IrO2 by 31 and 38 times at 1.43 V versus RHE, respectively. OER catalytic mechanism demonstrates that the conversion of *OH→*O and the active lattice O content can be significantly improved due to the modulation effect of the Ir single atoms on the local electronic structure and the redox behavior of FeNi (oxy) hydroxide true active species. This work provides a promising insight into understanding the OER enhancement mechanism for Ir single‐atoms modified FeNi‐hydroxide systems.

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High-valent iron single-atom catalysts for improved overall water splitting via a reduced energy barrier and stabilization of the active center

Abstract: The Design of Earth-abundant and non-precious transition metal-based single-atom catalysts (TM-SACs) for promoting oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is of excessive prominence to generate green hydrogen...

Cited by 14 publications

References 50 publications

Potent Noble Metal–Nickel Oxide Interaction: A Strategy for Improved Oxygen Reduction Reaction via Engineering the Electronic Structure

Potent Noble Metal–Nickel Oxide Interaction: A Strategy for Improved Oxygen Reduction Reaction via Engineering the Electronic Structure

Unlocking Performance: The Transformative Influence of Single Atom Catalysts on Advanced Lithium‐Sulfur Battery Design

Modulating Electronic Structure of Iridium Single‐Atom Anchored on 3D Fe‐Doped β‐Ni(OH)₂ Catalyst with Nanopyramid Array Structure for Enhanced Oxygen Evolution Reaction

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High-valent iron single-atom catalysts for improved overall water splitting via a reduced energy barrier and stabilization of the active center

Abstract: The Design of Earth-abundant and non-precious transition metal-based single-atom catalysts (TM-SACs) for promoting oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is of excessive prominence to generate green hydrogen...

Cited by 14 publications

References 50 publications

Potent Noble Metal–Nickel Oxide Interaction: A Strategy for Improved Oxygen Reduction Reaction via Engineering the Electronic Structure

Potent Noble Metal–Nickel Oxide Interaction: A Strategy for Improved Oxygen Reduction Reaction via Engineering the Electronic Structure

Unlocking Performance: The Transformative Influence of Single Atom Catalysts on Advanced Lithium‐Sulfur Battery Design

Modulating Electronic Structure of Iridium Single‐Atom Anchored on 3D Fe‐Doped β‐Ni(OH)2 Catalyst with Nanopyramid Array Structure for Enhanced Oxygen Evolution Reaction

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Modulating Electronic Structure of Iridium Single‐Atom Anchored on 3D Fe‐Doped β‐Ni(OH)₂ Catalyst with Nanopyramid Array Structure for Enhanced Oxygen Evolution Reaction