Nickel-decorated RuO2 nanocrystals with rich oxygen vacancies for high‐efficiency overall water splitting

Chen, Xinyu; Song, Jiexi; Xing, Yifei; Qin, Yanqing; Lin, Jian‐Bin; Qu, Xiao; Sun, Bianjing; Du, Shiyu; Shi, Diwei; Chen, Chuntao; Sun, Dongping

doi:10.1016/j.jcis.2022.10.061

Cited by 32 publications

(14 citation statements)

References 60 publications

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“…Similarly, a high binding energy shift is found for Cu-RuO 2 relative to RuO 2 , suggesting that the Ru 4+ replacement by Cu 2+ in the RuO 2 lattice may introduce some O v sites and then increase the Ru 4+ binding energy. [31,32] The corresponding O1s XPS plots show three obvious peaks located at ≈ 529.4, 530.9, and 532.5 eV, as shown in Figure S3c (Supporting Information), which can be assigned to lattice oxygen, the surface hydroxide groups absorbed by O v sites of the outer surface, and the adsorbed water. [29] Table S1 (Supporting Information) gives the detailed deconvoluted fitting results.…”

Section: Resultsmentioning

confidence: 99%

“…For the Cu 2+ displacement of Ru 4+ , the sample will incidentally generate the O v sites (solid white dots) as given in the model (left) for charge conservation. As reported, the O v sites are the electron aggregation centers, [ 31,32 ] the Ru 4+ nearby O v will be reduced under a certain voltage condition of cyclic voltammetry (CV), i.e., electrochemical activation. The surface will partially generate Ru 0 sites, and this process is an irreversible step.…”

Section: Resultsmentioning

confidence: 99%

“…Divalent ion (M 2+ ) doping into RuO 2 will cause the structural change, for example, by introducing oxygen vacancy (O v ) or subtle lattice distortion, owing to which the connection of Ru-O hexahedra is disrupted. [31][32][33][34] In particular, the O v sites will become electron aggregation centers [32] and the disordered lattices can provide more edge active sites. [35] Partial reduction of M 2+ -doped RuO 2 and its associated alkaline HER performance has received less attention.…”

Section: Introductionmentioning

confidence: 99%

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Accelerating Ru⁰/Ru⁴⁺ Adjacent Dual Sites Construction by Copper Switch for Efficient Alkaline Hydrogen Evolution

Xi,

Jin,

Mahmood

et al. 2023

Advanced Energy Materials

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The alkaline hydrogen evolution reaction (HER) always needs the nearby dual sites of water adsorption and H2 generation, and Ruthenium‐based electrocatalysts are promising alternatives to platinum‐based materials. However, achieving both high efficiency and long‐term stability in the construction of the dual sites is still challenging. Herein, Cu‐doped RuO2 (Cu‐RuO2) is reported and undergoes instant activation for Ru0 production at the low potential state preceding the HER. The Cu2+ ions are demonstrated to work as the switch for obtaining the activated sample of Cu‐RuO2‐AC, which possesses the Ru‐RuO2 structure. The sample of Cu‐RuO2‐AC gives an overpotential of only 19 mV at the current density of 10 mA cm−2 with a Tafel slope of 32.8 mV dec−1. Moreover, at the mass activity of 1 A mgRu−1, it only needs 88 mV, which is lower than the 343 mV of commercial 40% Ru/C, or the 154 mV of activated bare RuO2 (RuO2‐AC). Density functional theory (DFT) calculations reveal that Cu2+ doping activates the nearby Ru4+. A two‐electrode H‐cell device of Cu‐RuO2‐AC||Cu‐RuO2 needs only 1.66 and 1.78 V versus RHE to achieve a current density of 100 and 200 mA cm−2 of overall water splitting. This research can help design more efficient dual‐site HER electrocatalysts.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Accelerating Ru⁰/Ru⁴⁺ Adjacent Dual Sites Construction by Copper Switch for Efficient Alkaline Hydrogen Evolution

Xi,

Jin,

Mahmood

et al. 2023

Advanced Energy Materials

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“…Among the various NCSs synthesized up to date, CaPtAs stands out as an intriguing compound for displaying the unique property of exhibiting simultaneously TRS breaking and nodal superconductivity, making CaPtAs a promising candidate material for exploring and constructing novel electronic excitations, such as Majorana zero modes. , The attractive benefits offered by CaPtAs make it urgent to conduct comprehensive screening and evaluation of undiscovered compounds in structures similar to CaPtAs. Utilizing the advancements in materials databases and computational science, − this study conducted a systematic high-throughput screening. Based on data-driven evaluation and first-principles calculations on alkali and alkaline–earth-based 1:1:1 compounds with CaPtAs structure, the stabilities and electronic properties of these compounds were evaluated.…”

Section: Introductionmentioning

confidence: 99%

High-Throughput Computational Screening and Design of CaPtAs-like Equiatomic Ternary Noncentrosymmetric Superconductors

Song,

Qin,

Shi

et al. 2023

J. Phys. Chem. C

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Noncentrosymmetric superconductors (NCSs) are promising candidates for investigating spontaneous time-reversal symmetry breaking and topological superconductivity. This study aims to present a computational materials discovery and design process for developing CaPtAs-like NCSs. Through a comprehensive screening based on first-principles calculations, the range of CaPtAs-like materials is expanded to 13 compounds with superior stabilities, thereby indicating a high likelihood of synthesis. Based on the symmetry indicators diagnosis, SrPtAs, NaPtSi, and SrPtP were screened out as good candidates for investigating nodal superconductivity. Moreover, KPtP, CaRhAs, and CaPtSi were proposed as possible topological superconductor candidates. This investigation serves to aid in the design and expansion of the viable phase space for CaPtAs-like NCSs, and this screening framework may be extended to other NCS systems.

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“…[4] Noble metal-based catalysts (Pt/RuO 2 ) have been long employed as benchmark catalysts for HER/OER, however, the high cost and scarcity of resources for these catalysts greatly limit the possibility of their large-scale deployment. [5,6] Furthermore, it has been demonstrated that the integration of cathodic and anodic electrodes using the same electrocatalyst can simplify the system and lower manufacturing costs in industrial applications. [7] Therefore, there is an incredible need to develop efficient, durable and low-cost bifunctional electrocatalysts for practical application.…”

Section: Introductionmentioning

confidence: 99%

Ruthenium‐Induced Activation of Molybdenum‐Cobalt Phosphide for High‐Efficiency Water Splitting

Bi,

Zhang,

Jiang

et al. 2023

Adv Funct Materials

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Advancing green hydrogen production technologies relies heavily on the development of highly efficient and durable bifunctional catalysts for overall water splitting. Herein, this study reports the ruthenium‐modified hollow cubic molybdenum‐cobalt phosphide (Ru‐MoCoP) as exceptional performance electrocatalyst for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Theoretical calculations and experimental results indicate that the incorporation of Ru not only serves as an efficient active site, but also adjusts the electronic structure and improves the reactivity of the original sites, as well as generates more phosphorus vacancies, which improves the electrical conductivity and exposes more active sites. Benefiting from the advantages triggered by the incorporation of Ru mentioned above, the Ru‐MoCoP delivers low overpotentials of 55 and 240 mV at 10 mA cm−2 for HER and OER, respectively. Furthermore, the electrolyzer assembled with Ru‐MoCoP achieves a current density of 50 mA cm−2 at 1.6 V and can be operated stably for 150 h. Notably, the assembled two‐electrode system can be powered by a single commercial AA battery, accompanied with evident gas bubble evolution. This research proposes a promising strategy for the development of highly efficient bifunctional phosphide catalysts, aiming to achieve efficient energy conversion in a wide range of industrial applications.

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Nickel-decorated RuO2 nanocrystals with rich oxygen vacancies for high‐efficiency overall water splitting

Cited by 32 publications

References 60 publications

Accelerating Ru⁰/Ru⁴⁺ Adjacent Dual Sites Construction by Copper Switch for Efficient Alkaline Hydrogen Evolution

Accelerating Ru⁰/Ru⁴⁺ Adjacent Dual Sites Construction by Copper Switch for Efficient Alkaline Hydrogen Evolution

High-Throughput Computational Screening and Design of CaPtAs-like Equiatomic Ternary Noncentrosymmetric Superconductors

Ruthenium‐Induced Activation of Molybdenum‐Cobalt Phosphide for High‐Efficiency Water Splitting

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Nickel-decorated RuO2 nanocrystals with rich oxygen vacancies for high‐efficiency overall water splitting

Cited by 32 publications

References 60 publications

Accelerating Ru0/Ru4+ Adjacent Dual Sites Construction by Copper Switch for Efficient Alkaline Hydrogen Evolution

Accelerating Ru0/Ru4+ Adjacent Dual Sites Construction by Copper Switch for Efficient Alkaline Hydrogen Evolution

High-Throughput Computational Screening and Design of CaPtAs-like Equiatomic Ternary Noncentrosymmetric Superconductors

Ruthenium‐Induced Activation of Molybdenum‐Cobalt Phosphide for High‐Efficiency Water Splitting

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Accelerating Ru⁰/Ru⁴⁺ Adjacent Dual Sites Construction by Copper Switch for Efficient Alkaline Hydrogen Evolution

Accelerating Ru⁰/Ru⁴⁺ Adjacent Dual Sites Construction by Copper Switch for Efficient Alkaline Hydrogen Evolution