RuCo alloy trifunctional electrocatalysts with ratio-dependent activity for Zn–air batteries and self-powered water splitting

Pei, Yu; He, Weijun; Wang, Minmin; Wang, Jin; Sun, Tongming; Hu, Lanping; Zhu, Jinlin; Tan, Yanfeng; Wang, Jiacheng

doi:10.1039/d0cc07565e

Cited by 30 publications

(11 citation statements)

References 19 publications

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“…This result is consistent with a previous study that reported the formation of hcp-structured Ru–Co alloys . Also, a recent experimental study shows that the RuCo-alloyed structure can be readily synthesized …”

Section: Methodssupporting

confidence: 93%

“…11 Also, a recent experimental study shows that the RuCo-alloyed structure can be readily synthesized. 12 Then, several 2 × 2 × 1 supercells of the B h structure were optimized to model the RuCo(0001) surface, in which various atomic configurations were considered (Table S2, Supporting Information), and the S4 surface structure was found to be most thermodynamically favorable. The notations for the adsorption sites on RuCo(0001) with the S4 structure are given in Figure S1, Supporting Information.…”

Section: ■ Methodsmentioning

confidence: 99%

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Origin of Enhanced Ammonia Synthesis on Ru–Co Catalysts Unraveled by Density Functional Theory

2022

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Bimetallic Ru−Co catalysts have been reported as promising NH 3 production catalysts that are better than various Ru−X alloys, including RuFe and pure Ru, under mild conditions; however, a systematic understanding of their superior activity is still lacking. Here, we report a comprehensive theoretical study on NH 3 synthesis of Ru−Co catalysts using density functional theory and microkinetic modeling. Indeed, the RuCo surface enables more facile N 2 dissociation than the Ru surface, which results from the manifested Co-induced spin symmetry breaking of Ru. We also investigated the surface phase diagram of RuCo(0001) with partial pressures of H 2 and N 2 gases and found that the most stable phase of the RuCo surface consists of a fraction of both N and H atoms under experimental Haber−Bosch pressure conditions; however, NH 3 can be readily produced on the surfaces without severe surface poisoning issues. Furthermore, this study shows that the spin-symmetry breaking of nonmagnetic surfaces can enhance the catalytic activity for NH 3 synthesis, which provides an alternative strategy to catalyst design.

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Section: Methodssupporting

confidence: 93%

Section: ■ Methodsmentioning

confidence: 99%

Origin of Enhanced Ammonia Synthesis on Ru–Co Catalysts Unraveled by Density Functional Theory

2022

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“…This core–shell nanostructure can not only improve the conductivity but also provide more accessible active sites and protect the metal-based active species during the catalytic process. Moreover, the lattice fringes with a spacing of 0.22 and 0.208 nm corresponds to the (100) and (002) planes of RuCo alloy, while the lattice spacing with 0.255 and 0.291 nm corresponds to the (101) and (220) planes of RuO 2 and Co 3 O 4 , respectively, − revealing the coexistence of RuCo alloy, RuO 2 , and Co 3 O 4 in RuCo-LNC-120. Similarly, note that the lattice spacing of 0.475 nm, corresponding to the (111) plane of spinel Co 3 O 4 , is larger than the theoretical value (0.467 nm), speculating that Ru 4+ may be doped into the Co 3 O 4 microstructure.…”

Section: Resultsmentioning

confidence: 98%

Multifunctional Salt-Assisted Construction of Lignin-Derived Ru–Co Bimetal/Carbon Composites with Rich Nanointerface for Electrocatalytic Water Splitting

et al. 2022

ACS Sustainable Chem. Eng.

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Rational design of biomass-derived carbon nanocomposites as bifunctional catalysts of the oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER) is of great significance for both the high-valued utilization of biomass waste and the practical application of water splitting. Herein, a novel multifunctional salt-assisted strategy consisting of surface/interface engineering is proposed to achieve a lignin-derived bifunctional catalysts of OER and HER using potassium hexacyanocobaltate (PHC) as the multifunctional modifying agent and lignin as the carbon precursor. PHC can not only induce Co-based components and nitrogen doping but also dramatically improve pore structure. Profiting from the surface-interface synergistic structures of Ru–Co multiple active components and hierarchical porous carbon support with high surface area, the RuCo-NC-120 catalyst shows superior activities toward OER and HER with the overpotentials of 242 and 52 mV at 10 mA cm–2, respectively. As a consequence, the RuCo-NC-120-based alkali electrolyzer only needs a cell voltage of 1.531 and 1.825 V to achieve 10 and 200 mA cm–2, respectively, and possesses excellent long-term stability. This study provides a novel strategy to effectively regulate the composition, morphology, and pore structure of the lignin-derived carbon, and it may open new avenues for high-value utilization of lignin.

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“…Unfortunately, high cost and resource scarcity have restricted their large-scale applications. [15][16][17][18][19] Consequently, the search for inexpensive and high-performance OER electrocatalysts is inevitable for advanced energy devices, but challenging. [20][21][22] Recently, much work has been done to develop highefficient and low-cost OER electrocatalysts.…”

Section: Introductionmentioning

confidence: 99%

Scalable Synthesis of Bimetallic CoFe Alloy Nanoparticles for Efficient Oxygen Evolution Reaction

Yang

Zhou

et al. 2023

ChemistrySelect

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The development of efficient electrocatalysts towards oxygen evolution reaction (OER) is critical for large-scale applications of electrochemical water splitting and metal-air cells. Usually, transition metal alloys exhibit superior activity for OER. Herein, we successfully prepared a series of scalable transition metal alloys with homogeneous size by a facial sol-gel self-propagating combustion method. Among them, the CoFe alloy displayed the highest oxygen evolution reaction (OER) activity, achieving an overpotential of 310 mV at 10 mA cm À 2 . After running OER tests for 48 h, the activity of CoFe alloy hardly decayed, indicating its outstanding stability. This work may make some contributions to the production of promising transition metal alloy catalysts and related energy equipment applications.

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RuCo alloy trifunctional electrocatalysts with ratio-dependent activity for Zn–air batteries and self-powered water splitting

Abstract: Herein, we reported a RuCo alloy with nitrogen-doped porous carbon (RuCo/NPC) as efficient trifunctional electrocatalysts for Zn–air batteries and water splitting.

Cited by 30 publications

References 19 publications

Origin of Enhanced Ammonia Synthesis on Ru–Co Catalysts Unraveled by Density Functional Theory

Origin of Enhanced Ammonia Synthesis on Ru–Co Catalysts Unraveled by Density Functional Theory

Multifunctional Salt-Assisted Construction of Lignin-Derived Ru–Co Bimetal/Carbon Composites with Rich Nanointerface for Electrocatalytic Water Splitting

Scalable Synthesis of Bimetallic CoFe Alloy Nanoparticles for Efficient Oxygen Evolution Reaction

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