Oxygen-Vacancy-Induced CeO2/Co4N heterostructures toward enhanced pH-Universal hydrogen evolution reactions

Yao, Na; Meng, Ran; Wu, Fei; Fan, Zhengyin; Cheng, Gongzhen; Luo, Wei

doi:10.1016/j.apcatb.2020.119282

Cited by 188 publications

(92 citation statements)

References 59 publications

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“…DFT calculations demonstrated that the generated oxygen vacancies are able to reduce the adsorption and cleavage energy of water molecules on the surface of the designed nanomaterials. The same conclusion was obtained by Luo and co‐workers [ 29 ] who prepared oxygen vacancy‐rich CeO 2 nanoparticles supported on Co 4 N nanorod arrays and the theoretical and experimental results demonstrated that the existence of oxygen vacancies could improve the adsorption and dissociation ability of water molecule for HER. Then, the obtained electrocatalyst presents excellent electrocatalytic performance for HER with a small overpotential of 30 mV to drive 10 mA cm −2 in 1 m KOH.…”

Section: Classification Of Vacanciessupporting

confidence: 84%

Recent Progress of Vacancy Engineering for Electrochemical Energy Conversion Related Applications

Zhao

Jin

et al. 2020

Adv Funct Materials

221

129

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Efficient electrocatalysts are key requirements for the development of ecofriendly electrochemical energy‐related technologies and devices. It is widely recognized that the introduction of vacancies is becoming an important and valid strategy to promote the electrocatalytic performances of the designed nanomaterials. In this review, the significance of vacancies (i.e., cationic vacancies, anionic vacancies, and mixed vacancies) on the improvement of electrocatalytic performances via three main functionalities, including tuning the electronic structure, regulating the active sites, and improving electrical conductivity, is systematically discussed. Recent achievements in vacancy engineering on various hotspot electrocatalytic processes are comprehensively summarized, with focus on the oxygen reduction reaction (ORR), oxygen evolution reaction (OER), hydrogen evolution reaction (HER), nitrogen reduction reaction (NRR), CO2 reduction reaction (CO2RR), and their further applications in overall water‐splitting and zinc–air battery devices. The recent development of vacancy engineering for other energy‐related applications is also summarized. Finally, the challenges and prospects of vacancy engineering to regulate the electrocatalytic performances of different electrochemical reactions are discussed.

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Section: Classification Of Vacanciessupporting

confidence: 84%

Recent Progress of Vacancy Engineering for Electrochemical Energy Conversion Related Applications

Zhao

Jin

et al. 2020

Adv Funct Materials

221

129

View full text Add to dashboard Cite

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“…[ 18b ] In addition, oxygen vacancies in oxides facilitate H 2 O adsorption. [ 50 ] Inspired by these guidelines, Guan et al. presented the general sufficient‐and‐necessary conditions for designing superior HER electrocatalysts based on bulk transition‐metal oxides: 1) multiple active sites for the two‐step HER process and 2) short reaction paths.…”

Section: High‐valence Metal Sitesmentioning

confidence: 99%

Designing High‐Valence Metal Sites for Electrochemical Water Splitting

Sun

Song

et al. 2021

Adv Funct Materials

252

162

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Electrochemical water splitting is a critical energy conversion process for producing clean and sustainable hydrogen; this process relies on low‐cost, highly active, and durable oxygen evolution reaction/hydrogen evolution reaction electrocatalysts. Metal cations (including transition metal and noble metal cations), particularly high‐valence metal cations that show high catalytic activity and can serve as the main active sites in electrochemical processes, have received special attention for developing advanced electrocatalysts. In this review, heterogenous electrocatalyst design strategies based on high‐valence metal sites are presented, and associated materials designed for water splitting are summarized. In the discussion, emphasis is given to high‐valence metal sites combined with the modulation of the phase/electronic/defect structure and strategies of performance improvement. Specifically, the importance of using advanced in situ and operando techniques to track the real high‐valence metal‐based active sites during the electrochemical process is highlighted. Remaining challenges and future research directions are also proposed. It is expected that this comprehensive discussion of electrocatalysts containing high‐valence metal sites can be instructive to further explore advanced electrocatalysts for water splitting and other energy‐related reactions.

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“…For instance, Yao et al. found that the calculated H 2 O adsorption free energies for Vo−CeO 2 /Co 4 N on O vacancies sites were the lowest (Figure 6a), suggesting that O vacancies sites performed as the water adsorption site for the alkaline HER process [52] . Park et al.…”

Section: Functions Of Anion Vacancymentioning

confidence: 99%

“… (a) The Gibbsadsorption free energies of water on Co 4 N and CeO 2 /Co 4 N (111) surface [52] . (b) Free‐energy diagram for Co clusters embedded in MoS 2‐x .…”

Section: Functions Of Anion Vacancymentioning

confidence: 99%

Anion Vacancy Engineering in Electrocatalytic Water Splitting

et al. 2020

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Electrochemical water splitting is an eco‐friendly and sustainable energy conversion technology, while its large‐scale application is limited by the lack of efficient electrocatalysts. Notably, anion vacancy engineering, with functions of enhancing intrinsic activity, providing/increasing active sites, improving electrical conductivity, and strengthening stability, has been widely applied to boost the activity of electrocatalysts. In this review, we focus on anion vacancy engineering on electrocatalysts for water splitting. First, various synthesis strategies are introduced. Then the characterization techniques are classified and summarized into three catalogs: microscopy characterization, spectroscopy characterization, and theoretical studies. Lastly, the functions and challenges of anion vacancies in electrocatalysts for water splitting are briefly discussed.

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Oxygen-Vacancy-Induced CeO2/Co4N heterostructures toward enhanced pH-Universal hydrogen evolution reactions

Cited by 188 publications

References 59 publications

Recent Progress of Vacancy Engineering for Electrochemical Energy Conversion Related Applications

Recent Progress of Vacancy Engineering for Electrochemical Energy Conversion Related Applications

Designing High‐Valence Metal Sites for Electrochemical Water Splitting

Anion Vacancy Engineering in Electrocatalytic Water Splitting

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