Defect enriched hierarchical iron promoted Bi2MoO6 hollow spheres as efficient electrocatalyst for water oxidation

Khatun, S.; Shimizu, Kōji; Singha, Soumen; Saha, Rajat; Watanabe, Satoshi; Roy, Poulomi

doi:10.1016/j.cej.2021.131884

Cited by 29 publications

(17 citation statements)

References 60 publications

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“…[21][22][23][24][25] Although several strategies for regulating electronic configuration and electrical conductivity have been adapted by surface engineering, introducing defects or vacancies, nanoscale design, heteroatom doping, etc., benchmarking performance has yet to be achieved. [26][27][28][29][30][31][32][33][34] Moreover, such TMOs are often found to be good OER catalysts, but most of them remain HER and ORR inactive. For practical applications of water splitting, developing an integrated electrolyzer by pairing two electrode reactions is often difficult due to the diversity of the pH range of the electrolyte in which those electrocatalysts must remain active as well as stable.…”

Section: Why Tmnos?mentioning

confidence: 99%

Transition Metal Non‐Oxides as Electrocatalysts: Advantages and Challenges

Das

Sinha

Roy

2022

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energy crisis. To satisfy this surging global energy demand, people often tend to use nonrenewable resources (coal, petroleum, natural gas, etc.), which generates an enormous amount of greenhouse gases, causing great obstacles for the development of a healthy human society. [1] To avoid such unhealthy environmental pollution, the use of renewable energy resources such as wind, solar, hydroelectric power, etc., over the past few years has served as the top priority to meet the global energy demand. The advancement of science and technology and the global realization of escalating energy demand have led the present generation to explore clean energy sources as future alternatives due to their easy accessibility and high energy density. [2,3] Consequently, in recent years, energy conversion technologies focusing on the conversion of renewable energies (wind, water, etc.) into easily stored chemical energy is attracting much attention. [4][5][6] The electrochemical splitting of water molecules to generate highly efficient hydrogen and oxygen is considered to be one of the promising methods for the generation of green hydrogen as a clean fuel alternative to fossil fuel. [7][8][9][10][11] Hydrogen, present in abundance, with zero carbon emissions and high energy yield, is considered an efficient energy carrier similar to electricity and batteries. The electrocatalytic process in an electrolyzer involves hydrogen generation at the cathode based on the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) at the anode. [12,13] However, in practical applications, the largescale utilization of water electrolysis is seriously hindered due to the sluggish kinetics of OER and lack of stability of the electrocatalyst. [14] The sluggish reaction kinetics of OER are due to the four-electron transfer reaction, which requires overcoming a considerable amount of activation energy barrier corresponding to the breaking of the O-H bond and the formation of the O-O double bond, unlike HER, involving only two electron-transfer reactions. On the other hand, the oxygen reduction reaction (ORR), as a very important part of fuel cell applications, also requires four electron transfer pathways to dissociate the O-O double bond with slow reaction kinetics. To overcome the sluggish kinetics of OER, diverse studies have been devoted to designing electrocatalysts to facilitate the process. Undoubtedly, noble metal (Ru, Ir)-based electrocatalysts well served in minimizing the required activation energy, The identification of hydrogen as green fuel in the near future has stirred global realization toward a sustainable outlook and thus boosted extensive research in the field of water electrolysis focusing on the hydrogen evolution reaction (HER), oxygen evolution reaction (OER), and oxygen reduction reaction (ORR). A huge class of compounds consisting of transition metalbased nitrides, carbides, chalcogenides, phosphides, and borides, which can be collectively termed transition metal non-oxides (TMNOs), has emerged recently as an ef...

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Section: Why Tmnos?mentioning

confidence: 99%

Transition Metal Non‐Oxides as Electrocatalysts: Advantages and Challenges

Das

Sinha

Roy

2022

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“…In any case, the half-cell anodic OER is kinetically more sluggish than cathodic HER and is considered as the rate-controlling reaction pathway for water decomposition. 15 Unfortunately, the phenomena in direct seawater electrolysis becomes very challenging due to the presence of complex salt concentration up to 3.5 wt% involving various competitive redox reactions, which causes electrode degradation and interference in the efficiency of electrolysis process. The standard redox potential values, especially for chloride and bromide, are much comparable to water oxidation, making corrosive CER/BER mechanism as the most troubling factor for seawater electrolysis.…”

Section: Electrochemistry Involved In Seawater Splittingmentioning

confidence: 99%

“…In any case, the half-cell anodic OER is kinetically more sluggish than cathodic HER and is considered as the rate-controlling reaction pathway for water decomposition. 15…”

Section: Electrochemistry Involved In Seawater Splittingmentioning

confidence: 99%

New age chloride shielding strategies for corrosion resistant direct seawater splitting

et al. 2023

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“…2 Resource scarcity and the expensive nature of the conventional noble metal based OER electrocatalysts have led researchers to develop catalysts, which are earth abundant, cost effective and as electrocatalytically as active as the conventional ones. [3][4][5] Amidst the surging hydrogen economy, scaling-up of hydrogen gas production also involves consumption of a large volume of fresh water, which itself is considered to be an alarming step due to global water scarcity. In this regard, the use of seawater can be considered as a great approach due to its enormous availability as about 96.5% of water on the earth is available in the seas or oceans.…”

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confidence: 99%

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confidence: 99%