Recent Advances in Self-Supported Layered Double Hydroxides for Oxygen Evolution Reaction

Wu, Libo; Luo, Yu; Xiao, Xin; Zhang, Fanghao; Song, Shaowei; Chen, Shuo; Ren, Zhifeng

doi:10.34133/2020/3976278

Cited by 71 publications

(65 citation statements)

References 82 publications

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“…In an electrolytic cell, the two‐electron HER and four‐electron OER proceed at the cathode and anode, respectively, and usually require at least a working potential of 1.23 V 47‐49 . Stable and efficient catalysts are highly desired for the HER and OER to reduce the overpotential.…”

Section: Metal Phosphides As Bifunctional Catalyst For Her and Oermentioning

confidence: 99%

Promotion effect of metal phosphides towards electrocatalytic and photocatalytic water splitting

Han

Chen

Fan

et al. 2021

EcoMat

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Hydrogen evolution from water splitting over semiconductors has been considered one of the most promising ways to address energy shortages and environmental pollution. Searching for low‐cost, highly efficient, and durable catalysts is the key to improve the hydrogen production rate. Expensive noble metals, such as Pt and Au, are generally loaded onto semiconductors to promote photocatalytic activity. Metal phosphides are promising candidates to replace noble metals in hydrogen generation via electrocatalytic or photocatalytic water splitting due to their low hydrogen‐producing overpotential, tunable electronic structure, high electrical conductivity, and low price. In this review article, the characteristics and synthetic methods of metal phosphides are briefly introduced, and the development of metal phosphides for electrocatalytic or photocatalytic water splitting is presented. Finally, the challenges and future directions of metal phosphides are discussed.

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Section: Metal Phosphides As Bifunctional Catalyst For Her and Oermentioning

confidence: 99%

Promotion effect of metal phosphides towards electrocatalytic and photocatalytic water splitting

Han

Chen

Fan

et al. 2021

EcoMat

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“…Since then, study on SACs experienced an explosive growth and SACs have been used in various reactions including propane dehydrogenation [6], n-hexane isomerization [7], C-H bond activation [8], Suzuki coupling [9], and CO oxidation [5]. Especially, the introduction of SACs in electrochemical reactions, including hydrogen evolution reaction (HER) [10], oxygen evolution reaction (OER) [11,12], oxygen reduction reaction (ORR) [13], carbon dioxide reduction reaction (CO 2 RR) [14], and nitrogen reduction reaction (NRR) [15], boosts the great progress on synthesis, characterization, reaction mechanism, and structure-performance relationship of single-atom electrocatalysts (SAECs) due to the high detection sensitivity and low catalyst loadings for electrochemical reactions.…”

Section: Introductionmentioning

confidence: 99%

Recent Advances in Single-Atom Electrocatalysts for Oxygen Reduction Reaction

2020

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Oxygen reduction reaction (ORR) plays significant roles in electrochemical energy storage and conversion systems as well as clean synthesis of fine chemicals. However, the ORR process shows sluggish kinetics and requires platinum-group noble metal catalysts to accelerate the reaction. The high cost, rare reservation, and unsatisfied durability significantly impede large-scale commercialization of platinum-based catalysts. Single-atom electrocatalysts (SAECs) featuring with well-defined structure, high intrinsic activity, and maximum atom efficiency have emerged as a novel field in electrocatalytic science since it is promising to substitute expensive platinum-group noble metal catalysts. However, finely fabricating SAECs with uniform and highly dense active sites, fully maximizing the utilization efficiency of active sites, and maintaining the atomically isolated sites as single-atom centers under harsh electrocatalytic conditions remain urgent challenges. In this review, we summarized recent advances of SAECs in synthesis, characterization, oxygen reduction reaction (ORR) performance, and applications in ORR-related H2O2 production, metal-air batteries, and low-temperature fuel cells. Relevant progress on tailoring the coordination structure of isolated metal centers by doping other metals or ligands, enriching the concentration of single-atom sites by increasing metal loadings, and engineering the porosity and electronic structure of the support by optimizing the mass and electron transport are also reviewed. Moreover, general strategies to synthesize SAECs with high metal loadings on practical scale are highlighted, the deep learning algorithm for rational design of SAECs is introduced, and theoretical understanding of active-site structures of SAECs is discussed as well. Perspectives on future directions and remaining challenges of SAECs are presented.

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“…However, it can be calculated from the Tafel equation [Eq. ] [40,41]

true η = normala + normalb \log normalJ / normalJ_{0} (Tafel equation)

…”

Section: Activity Metricsmentioning

confidence: 99%

Recent Advances in Electrocatalysis of Oxygen Evolution Reaction using Noble‐Metal, Transition‐Metal, and Carbon‐Based Materials

2020

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A considerable concern in exploring clean, efficient, and renewable energy resources to effectively replace fossil fuels and to combat the environmental problems and energy scarcities for a sustainable future has been observed. In this context, hydrogen is a clean, renewable, energetically efficient fuel with infinite potential for the future, which can generate a large amount of energy through the electrocatalytic splitting of earth‐abundant water resources. Noble metals, owing to their extraordinary efficiency and stability, are state‐of‐the‐art catalysts for the oxygen evolution reaction (OER) process. However, their scarcity and high cost hamper their commercialization. To replace these expensive noble‐metal‐based materials, researchers are extensively working on the development of cost effective, stable, conductive, and efficient non‐noble metal based materials such as transition metal oxides, borides, nitrides, sulfides, phosphides, selenides, perovskites oxides, and layered double hydroxides, where the incorporation of heteroatoms improves the electrocatalytic activity by modifying the electronic structure and enhances the conductivity and stability. In the case of transition‐metal based metal organic frameworks (MOFs) and MOF‐derived materials, the unique structure of MOFs with a high surface area and porosity, as well as rich redox chemistry of transition metals, leads to excellent response towards the OER process. Moreover, direct utilization of carbonaceous materials or making their composites with transition metals not only enhances the conductivity due to their conductive nature but also promotes stability by strongly binding with the electrocatalyst. Owing to the presence of functional groups on the surface or through different interactions, they provide multiple paths for facile electron and ion transport due to the sheet/network like structure, which help in the fine dispersion of electrocatalyst due to high surface area, prevent agglomeration, and in turn results in improved electrocatalytic activity. Besides these advances, a) there is still a need for a thorough understanding of reaction mechanism via in situ spectroscopic techniques to further optimize the composition and design of electrocatalyst to get desired results, b) the stability of the materials should be further enhanced to practically utilize synthesized material under harsh conditions without degradation, and c) the utilization of these optimized OER catalysts in a solar cell to consume solar energy (renewable energy source), remains a key requirement of the modern era.

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Recent Advances in Self-Supported Layered Double Hydroxides for Oxygen Evolution Reaction

Cited by 71 publications

References 82 publications

Promotion effect of metal phosphides towards electrocatalytic and photocatalytic water splitting

Promotion effect of metal phosphides towards electrocatalytic and photocatalytic water splitting

Recent Advances in Single-Atom Electrocatalysts for Oxygen Reduction Reaction

Recent Advances in Electrocatalysis of Oxygen Evolution Reaction using Noble‐Metal, Transition‐Metal, and Carbon‐Based Materials

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