A review on fundamentals for designing oxygen evolution electrocatalysts

Song, Jiajia; Wei, Chao; Huang, Zhen‐Feng; Liu, Chuntai; Zeng, Lin; Wang, Xin; Xu, Zhichuan J.

doi:10.1039/c9cs00607a

Cited by 1,925 publications

(1,384 citation statements)

References 203 publications

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“…The metal‐oxygen covalency, which is determined by calculating the energy difference between the metal 3d and O 2p band centers, has been widely used as intrinsic factor correlated to the OER performance. [ 2,19,68,77–79 ] Compared to Ni‐OH, the energy difference between Ni 3d and O 2p band centers of NiFe‐LDH is clearly lower (Figure 5b), suggesting that enhanced NiO covalency was obtained in NiFe‐LDH. For R‐NiFe‐CPs, a similar NiO covalency is observed, but an increased Fe‐O covalency was found compared to NiFe‐LDH.…”

Section: Resultsmentioning

confidence: 99%

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Understanding and Optimizing Ultra‐Thin Coordination Polymer Derivatives with High Oxygen Evolution Performance

Zhao

Wan

Chen

et al. 2020

Advanced Energy Materials

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fuel shortage and climate change. [1] Noble metal-based materials (e.g., Pt and its alloys) have been well investigated and are among the most promising electrocatalysts for water splitting to generate clean hydrogen. [2,3] However, Pt group-based catalysts are still constrained by their scarcity and high cost for scalable and commercial electrocatalysis. Hence, the development of noble-metal-free catalysts with comparable catalytic activity and robust durability is an urgent task to realize technical applications of water electrolysis. [4,5] Coordination polymer assemblies (CPAs), which are composed of a metal center linked to organic or inorganic ligands combine tunable porous structures, well-dispersed metal sites, high surface areas, and good chemical stability. This renders them excellent materials for drug delivery, [6] gas storage and separation, [7] batteries, [8,9] and catalysis. [10-13] Thanks to their unique structural properties, transition metal-based CPAs keep attracting broad interest in the field of heterogeneous electrocatalysts. [9a,b-14] However, their intrinsic poor conductivity, low mass permeability, and confined active metal centers need to be systematically improved for their application as efficient electrocatalysts. Moreover, instability issues of the ligands such as self-oxidation or degradation at high oxidation potentials need to be resolved for directly using CPAs as long-term electrocatalysts. [14-17] Several strategies, for example, morphological modulation, electronic tuning, and surface modification, have been confirmed as promising approaches to improve the electrocatalytic performance of CPAs and CPs. [14,16-21] In a representative study, ultra-thin NiCo bimetallic CPA nanosheets with enhanced OER activity compared to bulk NiCo bimetallic CPAs, were synthesized through an ultrasonication exfoliation method. [14] Zhang et al. [16] demonstrated that monolayered heterogenous nanosheets of hybrid CoFeO x /CPAs were promising OER electrocatalysts. Some of us recently [20] proposed that the high and durable electrocatalytic activity of a new 1D cobalt coordination polymer (Co-dppeO 2) is due to its highly disordered structure, giving rise to exceptional resilience. Further theoretical calculations and in situ characterizations proved that the key architecture behind the high OER activity was arising from the {H 2 O-Co 2 (OH) 2-OH 2 } edge-site motifs. This study demonstrated the high potential of low-cost Engineering low-crystalline and ultra-thin nanostructures into coordination polymer assemblies is a promising strategy to design efficient electrocatalysts for energy conversion and storage. However, the rational utilization of coordination polymers (CPs) or their derivatives as electrocatalysts has been hindered by a lack of insight into their underlying catalytic mechanisms. Herein, a convenient approach is presented where a series of Ni 10-x Fe x-CPs (0 ≤ x ≤ 5) is first synthesized, followed by the introduction of abundant structural deficiencies using a facile reductive method ...

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Section: Resultsmentioning

confidence: 99%

“…The enhanced metal‐oxygen covalency, which results from synergistic effects between Fe insertion and structural deficiencies, can promote the electron mobility between the metal cations and intermediate anions (e.g., O 2− and O 2 2− ), thereby improving the OER kinetic properties. [ 68,77–79 ]…”

Section: Resultsmentioning

confidence: 99%

Understanding and Optimizing Ultra‐Thin Coordination Polymer Derivatives with High Oxygen Evolution Performance

Zhao

Wan

Chen

et al. 2020

Advanced Energy Materials

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“…[34,41] The latest progress in understanding the various mechanisms was recently summarized. [1] Two main scenarios for OER at MCs, following their transformation into oxides, are widely accepted: i) Classical adsorbate evolution mechanism, in which four proton-coupled electron transfer steps occur at the metal center, generating oxygen from the electrolyte, see Figure 2a. [41] In this route, the rate-determining step is often the formation of an OOH intermediate on the metal surface (step 4 in Figure 2a).…”

Section: Structural Properties and Mechanisms Of Oer/orr: Structure Tmentioning

confidence: 99%

“…Among others, water electrolysis, fuel cells and metal-air batteries are promising renewable energy technologies. [1,2] In 2018, approx. 800 MW of fuel cell power was supplied worldwide.…”

Section: Introductionmentioning

confidence: 99%

Metal‐Rich Chalcogenides as Sustainable Electrocatalysts for Oxygen Evolution and Reduction: State of the Art and Future Perspectives

Amin

Apfel

2020

Eur J Inorg Chem

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The rational design of high-performance and costeffective electrocatalysts is a key for the development of sustainable energy systems such as electrolyzers, fuel cells and metal-air batteries. Although water splitting and fuel cells are commercially mature technologies, they are still limited on large scale primarily due to the abundancy of the currently utilized expensive materials as well as the sluggish kinetics of the underlaying reactions, oxygen evolution reaction (OER) and oxygen reduction reaction (ORR), and thus the required large observed overpotentials. Therefore, an efficient inexpensive catalyst is necessary. In the last decade, metal chalcogenides have

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“…[29] These authors revealed a linear relationship between methane activation energy and oxygen binding energy on the surface (E O ). As oxygen binding energies have been widely applied in predicting the activity of electrocatalysts for oxygen evolution reaction (OER) [73,74] and oxygen reduction reaction (ORR), [73][74][75] the E O descriptor will facilitate the discovery of methane oxidation catalysts based on current OER and ORR catalysts. Indeed, the E O and G f descriptors are intrinsically related, as they both describe the formation energy of surface M−O active sites; it is expected that strong oxygen-binding materials will have low E O and G f and vice versa.…”

Section: Wwwadvancedsciencenewscommentioning

confidence: 99%

Conversion of Methane into Liquid Fuels—Bridging Thermal Catalysis with Electrocatalysis

Yuan

Peng

et al. 2020

Advanced Energy Materials

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The direct partial oxidation of methane to methanol promises an energy‐efficient and environmental‐friendly utilization of natural gas. Unfortunately, current technologies confront a grand challenge in catalysis, particularly in the context of distributed sources. Research has been focused on the design of homogenous and heterogenous catalysts to improve the activation of methane under thermal and electrochemical conditions. However, the intrinsic relationship between thermal and electrochemical systems has not been exploited yet. This review intends to bridge the studies of thermal and electrochemical catalysts, in both homogenous and heterogenous systems, for methane activation from a mechanistic point of view. It is expected to provide a framework to rationalize the design of electrocatalysts beyond the state of art. First, methane activation systems reported previously are reviewed and classified into two basic mechanisms: dehydrogenation and deprotonation. Based on the mechanism types, activity and selectivity descriptors are defined to understand the performance of current catalysts and guide the design of future catalysts. Moreover, methods to enhance the activity and selectivity are discussed to emphasize the unique advantage of electrocatalysis in overcoming the limitations of traditional thermal catalysis. Finally, immense opportunities and challenges for catalyst design are discussed by unifying thermal and electrochemical catalysis.

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A review on fundamentals for designing oxygen evolution electrocatalysts

Abstract: The fundamentals related to the oxygen evolution reaction and catalyst design are summarized and discussed.

Cited by 1,925 publications

References 203 publications

Understanding and Optimizing Ultra‐Thin Coordination Polymer Derivatives with High Oxygen Evolution Performance

Understanding and Optimizing Ultra‐Thin Coordination Polymer Derivatives with High Oxygen Evolution Performance

Metal‐Rich Chalcogenides as Sustainable Electrocatalysts for Oxygen Evolution and Reduction: State of the Art and Future Perspectives

Conversion of Methane into Liquid Fuels—Bridging Thermal Catalysis with Electrocatalysis

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