Mg-Doping improves the performance of Ru-based electrocatalysts for the acidic oxygen evolution reaction

Li, Zheng; Wang, Shuo; Tian, Yuanyuan; Li, Baihai; Yan, Hao; Zhang, Shuai; Liu, Zhaoming; Zhang, Qiuju; Lin, Yichao; Liang, Chunyong

doi:10.1039/c9cc09613b

Cited by 40 publications

(23 citation statements)

References 31 publications

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“…A solvothermal reaction is a facile synthesis strategy for introducing metal ions into the precursor, which is further converted to multimetallic, compound-doped carbons through a post-annealing process. [26,[110][111][112][113][114][115] Li et al reported a novel dispersing-etching-holing (DEH) approach to fabricate the 3D open nanonet-cage electrocatalyst (Figure 7Ba,b). [114] The operando XAS results confirmed that ZnO could be etched in situ during the HER process, while the provided RuIr alloy acted as the active sites (Figure 7Bc,d).…”

Section: Metal-compound-doped Carbon Electrocatalystsmentioning

confidence: 99%

Designing MOF Nanoarchitectures for Electrochemical Water Splitting

et al. 2021

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carrier with an extremely high energy density (approximately 142 MJ kg −1 ) and zero-carbon content, has been regarded as a promising clean fuel. [1,2] In this context, electrochemical water splitting, which converts electricity into storable hydrogen, is a viable and efficient solution to mitigate severe energy shortages and greenhouse gas emissions. [3] Among these strategies, hydrogen and oxygen evolution reactions, which occur on the cathode and anode, respectively, in a water electrolyzer, are considered as two critical half-reactions of the water-splitting process. [4] Theoretically, water splitting requires a thermodynamic Gibbs free energy (ΔG) of approximately 237.2 kJ mol −1 , corresponding to a standard potential (ΔE) of 1.23 V versus a reversible hydrogen electrode (RHE), which allows the thermodynamically uphill reaction to occur in the electrolyzer. [5] However, the unfavorable thermodynamics and resulting large overpotential are the main barriers to the scalable implementation of water electrolysis for hydrogen generation. [6,7] Currently, noble metal-based electrocatalysts exhibit the most efficient activity for water splitting, particularly Pt-based hydrogen evolution reaction (HER) catalysts and Ir/Ru-based oxygen evolution reaction (OER) catalysts. [8,9] Nevertheless, the scarcity and high price of precious metals severely impede their widespread use in commercial water-splitting applications. Taking these limitations into Electrochemical water splitting has attracted significant attention as a key pathway for the development of renewable energy systems. Fabricating efficient electrocatalysts for these processes is intensely desired to reduce their overpotentials and facilitate practical applications. Recently, metal-organic framework (MOF) nanoarchitectures featuring ultrahigh surface areas, tunable nanostructures, and excellent porosities have emerged as promising materials for the development of highly active catalysts for electrochemical water splitting. Herein, the most pivotal advances in recent research on engineering MOF nanoarchitectures for efficient electrochemical water splitting are presented. First, the design of catalytic centers for MOF-based/derived electrocatalysts is summarized and compared from the aspects of chemical composition optimization and structural functionalization at the atomic and molecular levels. Subsequently, the fast-growing breakthroughs in catalytic activities, identification of highly active sites, and fundamental mechanisms are thoroughly discussed. Finally, a comprehensive commentary on the current primary challenges and future perspectives in water splitting and its commercialization for hydrogen production is provided. Hereby, new insights into the synthetic principles and electrocatalysis for designing MOF nanoarchitectures for the practical utilization of water splitting are offered, thus further promoting their future prosperity for a wide range of applications.

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Section: Metal-compound-doped Carbon Electrocatalystsmentioning

confidence: 99%

Designing MOF Nanoarchitectures for Electrochemical Water Splitting

et al. 2021

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“…The high overpotential of the OER reaction is the most important factor affecting the efficiency of water electrolysis. [11][12][13][14][15][16][17][18][19][20] Up to now, despite a lot of research, RuO 2 is still considered to be the most active electrocatalyst for OER. However, its overpotential is still not low enough, and it has disadvantages such as poor stability and high price, which still needs to be further improved.…”

Section: Introductionmentioning

confidence: 99%

Nanostructured RuO₂–Co₃O₄@RuCo-EO with low Ru loading as a high-efficiency electrochemical oxygen evolution catalyst

et al. 2021

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“…Currently, MOFs and MOF‐derivatives have attracted extensive research interests for versatile properties in many fields (such as adsorption and catalysis) because of their tunable porosities, open channels, versatile functionalities and superhigh specific surface areas [9a,13] . In some synthesis process of electrocatalysts, like annealing, MOFs are usually used as precursors to obtained alloys, [14] doped oxides, [12a] heterojunctions, [15] metal‐nitrogen‐carbon system [9a,16] and other carbon based catalyst [17] . In some previous studies, the catalyst containing zinc element showed potential catalytic performance toward OER [18] .…”

Section: Methodsmentioning

confidence: 99%

MOF‐Derived Zinc‐Doped Ruthenium Oxide Hollow Nanorods as Highly Active and Stable Electrocatalysts for Oxygen Evolution in Acidic Media

Zhang

et al. 2021

ChemNanoMat

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It is highly desirable but challenging to develop active and stable electrocatalysts for oxygen evolution reaction (OER) in acid media. Heteroatom incorporation is an effective strategy of defect engineering for optimizing the intrinsic electrocatalytic activities. In this research, zinc‐doped ruthenium oxide (Zn‐doped RuO2) nanorods were prepared by using the facile two‐step method. It is found that the OER activity of Zn‐doped RuO2 catalysts can be readily controlled by varying the amount of Zn dopants. The Zn‐doped RuO2 catalyst with 6.4 at.% displays the best electrocatalytic activity with a low overpotential of 206 mV at 10 mA cm−2, a Tafel slope of 49 mV dec−1 and a long‐term chronopotentiometry test at 10 mA cm−2 for 30 h towards OER in 0.5 M H2SO4 solution. The enhanced OER performance may be attributed to the defective structures caused by Zn doping and the ultrasmall size of the RuO2 nanocrystals.

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Mg-Doping improves the performance of Ru-based electrocatalysts for the acidic oxygen evolution reaction

Abstract: Magnesium doped RuO2 exhibits excellent acidic oxygen evolution reaction performance with an overpotential of 228 mV at 10 mA cm−2.

Cited by 40 publications

References 31 publications

Designing MOF Nanoarchitectures for Electrochemical Water Splitting

Designing MOF Nanoarchitectures for Electrochemical Water Splitting

Nanostructured RuO₂–Co₃O₄@RuCo-EO with low Ru loading as a high-efficiency electrochemical oxygen evolution catalyst

MOF‐Derived Zinc‐Doped Ruthenium Oxide Hollow Nanorods as Highly Active and Stable Electrocatalysts for Oxygen Evolution in Acidic Media

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Mg-Doping improves the performance of Ru-based electrocatalysts for the acidic oxygen evolution reaction

Abstract: Magnesium doped RuO2 exhibits excellent acidic oxygen evolution reaction performance with an overpotential of 228 mV at 10 mA cm−2.

Cited by 40 publications

References 31 publications

Designing MOF Nanoarchitectures for Electrochemical Water Splitting

Designing MOF Nanoarchitectures for Electrochemical Water Splitting

Nanostructured RuO2–Co3O4@RuCo-EO with low Ru loading as a high-efficiency electrochemical oxygen evolution catalyst

MOF‐Derived Zinc‐Doped Ruthenium Oxide Hollow Nanorods as Highly Active and Stable Electrocatalysts for Oxygen Evolution in Acidic Media

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Nanostructured RuO₂–Co₃O₄@RuCo-EO with low Ru loading as a high-efficiency electrochemical oxygen evolution catalyst