Structural engineering and electronic state tuning optimization of molybdenum-doped cobalt hydroxide nanosheet self-assembled hierarchical microtubules for efficient electrocatalytic oxygen evolution

Wang, Chao; Li, Wen; Kistanov, Andrey A.; Singh, Harishchandra; Kayser, Yves; Cao, Wei; Geng, Baoyou

doi:10.1016/j.jcis.2022.08.069

Cited by 6 publications

(5 citation statements)

References 55 publications

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“…It is well known that the ECSA has an important influence on the performance of the catalyst. The ECSA of the material can be estimated by the C dl . By testing the CV curves at different scan rates (Figure S13), the linear curves of Δ j /2 and scan rate were plotted, and the slope was C dl value.…”

Section: Results and Discussionmentioning

confidence: 99%

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Synergistic Acid Hydrogen Evolution of Neighboring Pt Single Atoms and Clusters: Understanding Their Superior Activity and Mechanism

et al. 2023

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The hydrogen evolution reaction (HER) involves two-step elementary reactions, providing an opportunity to establish dual-site synergistic catalysts. This work demonstrates carbon-supported Pt single atoms and clusters (Pt1+Cs-NPC) as an efficient catalyst for acidic HER, which exhibits an ultralow Tafel slope of 12.5 mV/dec and an overpotential of 24 mV at 10 mA/cm2 with an ultralow platinum content of 3.8 wt %. The Pt mass activity and turnover frequency (TOF) are 10.2 times and 5.4 times that of commercial Pt/C, respectively. The density functional theory (DFT) study shows that the Pt cluster regulates the electronic state structure of the adjacent Pt single atom, so that the ΔG H* at the Pt1 site approaches 0. Moreover, the DFT study confirms that Pt clusters and neighboring Pt single atoms can synergistically catalyze the Tafel step and reduce the energy barrier in forming the H–H bond. At the same time, the platinum cluster reduces the energy barrier of the nearby platinum single-atom site to the Heyrovsky step and accelerates the reaction with hydrated hydrogen ions. Studies have shown that platinum clusters and platinum single-atom composite loading structures exhibit excellent activity for the Volmer–Tafel or Volmer–Heyrovsky reaction paths of HER reactions. This work provides a clear understanding of the synergistic effect of Pt1+Cs-NPC, which provides guidance for developing efficient HER catalysts.

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Section: Results and Discussionmentioning

confidence: 99%

“…The ECSA of the material can be estimated by the C dl . 32 By testing the CV curves at different scan rates (Figure S13), the linear curves of Δj/2 and scan rate were plotted, and the slope was C dl value. The results are shown in Figure 2d.…”

Section: Electrochemical Performancementioning

confidence: 99%

Synergistic Acid Hydrogen Evolution of Neighboring Pt Single Atoms and Clusters: Understanding Their Superior Activity and Mechanism

et al. 2023

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“…9 Therein, transition metal hydroxides have been extensively reported in the OER. 10,11 Especially, Co(OH) 2 , the multivalent oxidation states of Co (Co 2+ /Co 3+ /Co 4+ ), were beneficial to the OER. 12 However, there are few reports about the application of Co(OH) 2 for the HER.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Hitherto, numerous transition metal materials have been massively applied in OWS, such as hydroxides, oxides, alloys, nitrides, phosphides, and carbides . Therein, transition metal hydroxides have been extensively reported in the OER. , Especially, Co(OH) 2 , the multivalent oxidation states of Co (Co 2+ /Co 3+ /Co 4+ ), were beneficial to the OER . However, there are few reports about the application of Co(OH) 2 for the HER.…”

Section: Introductionmentioning

confidence: 99%

Engineered Superhydrophilic/Superaerophobic Catalyst: Two-Dimensional Co(OH)₂–CeO₂ Nanosheets Supported on Three-Dimensional Co Dendrites for Overall Water Splitting

Chen

et al. 2023

Inorg. Chem.

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Efficient electrocatalysts require not only a tunable electronic structure but also great active site accessibility and favorable mass transfer. Here, a two-dimensional/three-dimensional (2D/3D) hierarchical electrocatalyst consisting of Co-(OH) 2 −CeO 2 nanosheet-decorated Co dendrites is proposed, named as Co(OH) 2 −CeO 2 /Co. Based on the strong electronic interaction of the Co(OH) 2 −CeO 2 heterojunction, the electronic structure of the Co site is optimized, which facilitates the adsorption of intermediates and the dissociation of H 2 O.Moreover, the open 2D/3D structure formed by introducing the Co substrate further reduces the accumulation of heterogeneous nanosheets and promotes the radial diffusion of the electrolyte, significantly improving the utilization of active sites and shortening the electron transfer pathway. In addition, the superhydrophilic/ superaerophobic interface achieved by constructing the hierarchical micro-nanostructure is beneficial to electrolyte infiltration and bubble desorption, thus ensuring favorable mass transfer. Therefore, Co(OH) 2 −CeO 2 /Co exhibits an excellent overall watersplitting activity in alkaline solution.

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“…Recently, considerable efforts have been focused on the development of the Earth's abundance and inexpensive non-precious elementbased catalysts. 11,12 Selenides, 13,14 phosphides, 15,16 nitrides, 17,18 oxides, 19,20 carbides, 21,22 suldes, 23,24 and hydroxides 25,26 have been applied as electrocatalysts toward OER. Among them, transition metal phosphides (TMPs) have exhibited considerable advantages, such as earth-abundance, cost-effectiveness, approximately spherical triangular prism unit structure, indicating more active sites, high conductivity, and long sustainability in alkaline solutions.…”

Section: Introductionmentioning

confidence: 99%

Constructing interface engineering and tailoring a nanoflower-like FeP/CoP heterostructure for enhanced oxygen evolution reaction

et al. 2023

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Structural engineering and electronic state tuning optimization of molybdenum-doped cobalt hydroxide nanosheet self-assembled hierarchical microtubules for efficient electrocatalytic oxygen evolution

Cited by 6 publications

References 55 publications

Synergistic Acid Hydrogen Evolution of Neighboring Pt Single Atoms and Clusters: Understanding Their Superior Activity and Mechanism

Synergistic Acid Hydrogen Evolution of Neighboring Pt Single Atoms and Clusters: Understanding Their Superior Activity and Mechanism

Engineered Superhydrophilic/Superaerophobic Catalyst: Two-Dimensional Co(OH)₂–CeO₂ Nanosheets Supported on Three-Dimensional Co Dendrites for Overall Water Splitting

Constructing interface engineering and tailoring a nanoflower-like FeP/CoP heterostructure for enhanced oxygen evolution reaction

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Structural engineering and electronic state tuning optimization of molybdenum-doped cobalt hydroxide nanosheet self-assembled hierarchical microtubules for efficient electrocatalytic oxygen evolution

Cited by 6 publications

References 55 publications

Synergistic Acid Hydrogen Evolution of Neighboring Pt Single Atoms and Clusters: Understanding Their Superior Activity and Mechanism

Synergistic Acid Hydrogen Evolution of Neighboring Pt Single Atoms and Clusters: Understanding Their Superior Activity and Mechanism

Engineered Superhydrophilic/Superaerophobic Catalyst: Two-Dimensional Co(OH)2–CeO2 Nanosheets Supported on Three-Dimensional Co Dendrites for Overall Water Splitting

Constructing interface engineering and tailoring a nanoflower-like FeP/CoP heterostructure for enhanced oxygen evolution reaction

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Product

Resources

About

Engineered Superhydrophilic/Superaerophobic Catalyst: Two-Dimensional Co(OH)₂–CeO₂ Nanosheets Supported on Three-Dimensional Co Dendrites for Overall Water Splitting