Bifunctional Electrocatalysts for Overall and Hybrid Water Splitting

Chemical Reviews, Journal Year: 2024, Volume and Issue: 124(7), P. 3694 - 3812

Published: March 22, 2024

Electrocatalytic water splitting driven by renewable electricity has been recognized as a promising approach for green hydrogen production. Different from conventional strategies in developing electrocatalysts the two half-reactions of (e.g., and oxygen evolution reactions, HER OER) separately, there growing interest designing bifunctional electrocatalysts, which are able to catalyze both OER. In addition, considering high overpotentials required OER while limited value produced oxygen, is another rapidly exploring alternative oxidation reactions replace hybrid toward energy-efficient generation. This Review begins with an introduction on fundamental aspects splitting, followed thorough discussion various physicochemical characterization techniques that frequently employed probing active sites, emphasis reconstruction during redox electrolysis. The design, synthesis, performance diverse based noble metals, nonprecious metal-free nanocarbons, overall acidic alkaline electrolytes, thoroughly summarized compared. Next, their application also presented, wherein anodic include sacrificing agents oxidation, pollutants oxidative degradation, organics upgrading. Finally, concise statement current challenges future opportunities presented hope guiding endeavors quest sustainable

Language: Английский

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Iron‐Locked Hydr(oxy)oxide Catalysts via Ion‐Compensatory Reconstruction Boost Large‐Current‐Density Water Oxidation

Advanced Science, Journal Year: 2023, Volume and Issue: 10(16)

Published: April 7, 2023

Nickel-iron based hydr(oxy)oxides have been well recognized as one of the best oxygen-evolving catalysts in alkaline water electrolysis. A crucial problem, however, is that iron leakage during prolonged operation would lead to oxygen evolution reaction (OER) deactivation over time, especially under large current densities. Here, NiFe-based Prussian blue analogue (PBA) designed a structure-flexible precursor for navigating an electrochemical self-reconstruction (ECSR) with Fe cation compensation fabricate highly active hydr(oxy)oxide (NiFeO

Language: Английский

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Stability challenges and opportunities of NiFe‐based electrocatalysts for oxygen evolution reaction in alkaline media

Carbon Neutralization, Journal Year: 2024, Volume and Issue: 3(2), P. 172 - 198

Published: Feb. 26, 2024

Abstract Water splitting is a critical process for the production of green hydrogen, contributing to advancement circular economy. However, application water devices on large scale primarily impeded by sluggish oxygen evolution reaction (OER) at anode. Thus, developing and designing efficient OER catalysts significant target. NiFe‐based are extensively researched as excellent electrocatalysts due their affordability, abundant reserves, intrinsic activities. they still suffer from long‐term stability challenges. To date, few systematic strategies improving durability have been reported. In this review, various advanced introduced. Moreover, challenges in alkaline media, including iron segregation, structural degradation, peeling substrate summarized. More importantly, enhance highlighted opportunities discussed facilitate future studies electrolysis. This review presents design strategy anion exchange membrane (AEM) electrolyzers overcome OER, which also emphasizes importance media its significance achieving large‐scale commercialization.

Language: Английский

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Boosting oxygen evolution reaction by FeNi hydroxide-organic framework electrocatalyst toward alkaline water electrolyzer

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: Aug. 23, 2024

The oxygen evolution reaction plays a vital role in modern energy conversion and storage, developing cost-efficient catalysts with industrially relevant activity durability is highly desired but still challenging. Here, we report an efficient durable FeNi hydroxide organic framework nanosheet array catalyst that competently affords long-term at industrial-grade current densities alkaline electrolyte. desirable high-intensity performance attributed to three aspects as follows. First, two-dimensional porous arrays maximum specific surface facilitate mass/charge transfer accommodate high-current-density catalysis. Second, situ derived motifs offer bimetallic synergistic catalysis centers high intrinsic activity. Third, carboxyl ligands alleviate metal oxidation favorable for charge tolerability against peroxidation dissolution under strong polarization. As result, this requires overpotential of only 280 mV deliver density up 1 A/cm2 long over 1000 h. Moreover, water electrolyzer alternative demonstrates increased economic effectiveness compared commercial levels present. Developing crucial various technologies. Here the authors NiFe

Language: Английский

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Dynamic Phase Transformations of Prussian Blue Analogue Crystals in Hydrotherms

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: 146(24), P. 16659 - 16669

Published: June 7, 2024

Prussian blue analogue (PBA)/metal–organic frameworks (MOFs) are multifunctional precursors for the synthesis of metal/metal compounds, carbon, and their derived composites (P/MDCs) in chemical, medical, energy, other applications. P/MDCs combine advantages both high specific surface area PBA/MOF electronic conductivity metal compound/carbon. Although calcination under different atmospheres has been extensively studied, transformation mechanism hydrothermal conditions remains unclear. The qualitative preparation a challenge. Here, we select PBA to construct machine-learning model measure its phase diagram. architecture–activity relationship substances among nine parameters was analyzed PBA. Excitingly, established universal accurately fabricate 31 derivates. Additionally, performed three-dimensional reconstructed transmission electron microscopy, X-ray absorption fine structure spectroscopy, ultraviolet photoelectron situ powder diffraction, theoretical calculation analyze derivatives oxygen evolution reaction clarify mechanisms. We uncover unified principles PBA, expect guide design wide range composites.

Language: Английский

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High-Entropy Effect Promoting Self-Healing Behavior of Two-Dimensional Metal Oxide Electrocatalysts for Oxygen Evolution Reaction

ACS Catalysis, Journal Year: 2024, Volume and Issue: 14(5), P. 3700 - 3711

Published: Feb. 21, 2024

The irreversible leaching of metal atoms during the alkaline oxygen evolution reaction (OER) process greatly hinders long-term stability OER catalysts. Self-healing is a promising strategy to address this problem while constructing highly effective self-healing catalytic system still challenging. Here, we explore simple approach by incorporating high-valence metals molybdenum (Mo) and tungsten (W) into cobalt–iron (Co–Fe)-based oxide modulator. A high-entropy layered catalyst, FeCoMoW, synthesized using molten-alkali method. FeCoMoW catalyst exhibits capabilities, as demonstrated in chronoamperometric tests at high potential. It even shows reduction overpotential borate buffer (KBi, pH = 14) containing Co2+ undergoing 100 h test or enduring 5000 cycles cyclic voltammetry test. Importantly, presence materials found be essential for behavior, two-dimensional morphology catalysts conducive performance. This work introduces feasible design cost-effective robust with properties, thereby paving way more applications.

Language: Английский

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Structural evolution and self-reconstruction of nickel hexacyanoferrate Prussian blue analogues for long-lasting ampere-current seawater oxidation

Nano Today, Journal Year: 2024, Volume and Issue: 58, P. 102454 - 102454

Published: Aug. 23, 2024

Language: Английский

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A review of efficient electrocatalysts for the oxygen evolution reaction at large current density

DeCarbon, Journal Year: 2024, Volume and Issue: 5, P. 100062 - 100062

Published: July 14, 2024

Within the framework of achieving global carbon neutrality, utilizing electrocatalytic water splitting to produce "green hydrogen" holds significant promise as an effective solution. The strategic development economic, efficient, and robust anode oxygen evolution reaction (OER) catalysts is one imminent bottlenecks for scalable application electrolyzing into hydrogen oxygen, particularly under actual yet harsh operating conditions such large current density (LCD). In this review, we intend summarize advances challenges in understanding OER at LCD. Initially, impact LCD on electron transfer, mass transportation efficiency catalyst stability identified summarized. Furthermore, five basic principles design, namely dimension materials, surface chemistry, creation transfer pathways, synergy among nano-, micro-, macroscale structures, catalyst-support interaction, are systematically discussed. Specifically, correlation between synergistic function multiscale structures interaction highlighted direct improvements durability Finally, outlook prospected further our these topics provide related researchers with potential research areas.

Language: Английский

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Oxygen Plasma Triggered Co‐O‐Fe Motif in Prussian Blue Analogue for Efficient and Robust Alkaline Water Oxidation

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 16, 2024

In the context of oxygen evolution reaction (OER), construction high-valence transition metal sites to trigger lattice oxidation mechanism is considered crucial for overcoming performance limitations traditional adsorbate mechanism. However, dynamic during poses significant challenges stability sites, particularly in high-current-density water-splitting systems. Here, we have successfully constructed Co-O-Fe catalytic active motifs cobalt-iron Prussian blue analogs (CoFe-PBA) through plasma bombardment, effectively activating reactivity while sustaining robust stability. Our spectroscopic and theoretical studies reveal that bridged enable a unique double-exchange interaction between Co Fe atoms, promoting formation species as OER centers maintaining low-valence state, preventing its dissolution. The resultant catalyst (CoFe-PBA-30) requires an overpotential only 276 mV achieve 1000 mA cm

Language: Английский

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MXene-mediated reconfiguration induces robust nickel–iron catalysts for industrial-grade water oxidation

Proceedings of the National Academy of Sciences, Journal Year: 2024, Volume and Issue: 121(9)

Published: Feb. 20, 2024

Nickel–iron oxy/hydroxides (NiFeO x H y ) emerge as an attractive type of electrocatalysts for alkaline water oxidation reaction (WOR), but which encounter a huge challenge in stability, especially at industrial-grade large current density due to uncontrollable Fe leakage. Here, we tailor the coordination by MXene-mediated reconfiguration strategy resultant NiFeO catalyst alleviate leakage and thus reinforce WOR stability. The introduction ultrafine MXene with surface dangling bonds electrochemical over Ni-Fe Prussian blue analogue induces covalent hybridization /MXene, not only accelerates kinetics also improves resistance against segregation. As result, coupled exhibits extraordinary durability ampere-level 1,000 h ultralow overpotential 307 mV. This work provides broad avenue mechanistic insights development nickel–iron catalysts toward industrial applications.

Language: Английский

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