Hybrid Nanosheet Arrays: Boosting Activity on Co<sub>4</sub>N Porous Nanosheet by Coupling CeO<sub>2</sub> for Efficient Electrochemical Overall Water Splitting at High Current Densities (Adv. Funct. Mater. 32/2020)

Sun, Hongming; Tian, Caiying; Fan, Guilan; Qi, Jianing; Liu, Ziting; Yan, Zhenhua; Cheng, Peng; Chen, Jing; Li, Cheng‐Peng; Du, Miao

doi:10.1002/adfm.202070213

Cited by 39 publications

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“…The OER performance of CoFe PBA@CoP also exceeds most of the previously reported nonprecious OER electrocatalysts in alkaline media (Table S2, Supporting Information). [ 44–52 ] The stable amperometric i – t curve (Figure 5d) recorded at an overpotential of 180 mV further verified the extraordinary electrochemical OER stability. The possible mechanism of OER in KOH is displayed in Equation S3‐7, Supporting Information.…”

Section: Resultsmentioning

confidence: 59%

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Hierarchically Assembling CoFe Prussian Blue Analogue Nanocubes on CoP Nanosheets as Highly Efficient Electrocatalysts for Overall Water Splitting

Zhao

et al. 2021

Small Methods

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At present, to boost the sluggish kinetic of the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), precious Pt and Ir/Ru-based electrocatalysts are usually employed and acknowledged as benchmark in practical application. [3,4] However, their high cost has been considered as an insurmountable barrier. [5] Therefore, numerous efforts have been undertaken to exploit alternative electrocatalysts with cost-effective and high efficiency. [6][7][8] Moreover, bifunctional electrocatalysts are especially important from the technological point of view owing to their facility for cell assembly and reduced manufacture cost accordingly. [9] Among the booming earth-abundant alternatives, including transition metalbased oxide, [10] nitrides, [11] phosphides, [12] and selenides, [13] transition metal phosphides (TMPs) have sparked considerable attention due to their metalloid characteristics and superior electrical conductivity, thus demonstrated as promising bifunctional electrocatalysts. [14] Various approaches have been proposed to enhance the electrocatalytic performance of TMPs from the aspects of incorporation of foreign metal sites or surface coating, for example the preparation of bimetallic phosphide, [15] Cu 3 P coated by a N,Pcodoped carbon shell, [16] and CoP/TiO x heterostructure, [17] etc. Moreover, rational design of a catalyst with favorable electronic and geometric structure is also of prerequisite towards the rapid electron transfer and mass transport. [18] From this perspective, 2D TMPs nanosheets can serve as one of the most prospective candidates owing to their high surface area-to-volume ratio, highly exposed active sites, large contact area with electrolyte. Benefitted from the reduced thickness of TMPs nanosheets, the low-coordinated sites on the catalysts' surface including steps, edges, and kinks will be favorable for electrocatalytic process. [19,20] Nevertheless, due to the shrinkage and fusion caused by stress and decomposition, nanosheets are prone to collapse and thus the impaired electrocatalytic activities limit their application. In this regard, rational design of hierarchical heterostructures based on 2D TMPs nanosheets is highly desirable.Prussian blue (PB) and PB analogues (PBA) formed by coordination interaction between cyanide ligands and metal ions Efficient and durable electrocatalysts are highly desirable for overall water splitting. Herein, a facile strategy is demonstrated to rationally construct CoFe Prussian blue analogues (PBA)@CoP cube-on-sheet hierarchical structure by etching reaction with intermediated CoO to form PBA nanocubes. Benefitting from the heterostructured engineering, the as-synthesized CoFe PBA@CoP presents remarkable electrocatalytic performance in 1.0 m KOH, only requiring overpotentials of 100 mV for hydrogen evolution reaction (HER) and 171 mV for oxygen evolution reaction (OER) to reach the 10 mA cm −2 current density with good stability. Extraordinarily enhanced electrocatalytic performance is ascribed to not only the rapid charge transfer ...

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Section: Resultsmentioning

confidence: 59%

“…Notably, the performance of CoFe PBA@CoP/NF electrocatalyst is superior to most reported TM‐based bifunctional electrocatalysts for overall water splitting (Figure 7d). [ 21,47,57–62 ]…”

Section: Resultsmentioning

confidence: 99%

Hierarchically Assembling CoFe Prussian Blue Analogue Nanocubes on CoP Nanosheets as Highly Efficient Electrocatalysts for Overall Water Splitting

Zhao

et al. 2021

Small Methods

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“…In detail, as shown in transmission electron microscopy (TEM) images (Figure S5, Supporting Information), the nanoplate is assembled with sub‐unit nanoparticles, and the ceria‐incorporation preserves the nanoplates morphology meanwhile interconnected bi‐continuous porous structures are formed, which could facilitate mass transfer in electrocatalysis. [ 21 ] The corresponding TEM mappings depict the uniform distribution of elements for hybrid materials in one nanoplate, indicating the strong coupling of ceria and sulfide at the nanoscale (Figure S6, Supporting Information). Figure 1e−g displays the high‐resolution TEM (HR‐TEM) images of series materials, where the hybrids with different spatial architectures exhibit distinct atom arrangements around heterointerface perimeters.…”

Section: Resultsmentioning

confidence: 99%

Uncovering the Promotion of CeO₂/CoS_1.97 Heterostructure with Specific Spatial Architectures on Oxygen Evolution Reaction

et al. 2021

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Structural engineering and compositional controlling are extensively applied in rationally designing and fabricating advanced freestanding electrocatalysts. The key relationship between the spatial distribution of components and enhanced electrocatalysis performance still needs further elaborate elucidation. Here, CeO2 substrate supported CoS1.97 (CeO2‐CoS1.97) and CoS1.97 with CeO2 surface decorated (CoS1.97‐CeO2) materials are constructed to comprehensively investigate the origin of spatial architectures for the oxygen evolution reaction (OER). CeO2‐CoS1.97 exhibits a low overpotential of 264 mV at 10 mA cm−2 due to the stable heterostructure and faster mass transfer. Meanwhile, CoS1.97‐CeO2 has a smaller Tafel slope of 49 mV dec−1 through enhanced adsorption of OH−, fast electron transfer, and in situ formation of Co(IV)O2 species under the OER condition. Furthermore, operando spectroscopic characterizations combined with theoretical calculations demonstrate that spatial architectures play a distinguished role in modulating the electronic structure and promoting the reconstruction from sulfide to oxyhydroxide toward higher chemical valence. The findings highlight spatial architectures and surface reconstruction in designing advanced electrocatalytic materials.

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“…Obviously, the fitted Ni 3+ and Ni 2+ peaks both slightly shifted to higher binding energy, further suggesting the electron transfer from Ni to around atoms. [ 33,35,48,49 ] The electron donation nature of both Ce and Ni in the NiO/CeO 2 heterophase could be due to the generation of a certain amount of O‐vacancies as demonstrated above, which required the charge transfer from Ce and Ni to maintain the charge neutrality. [ 50 ] Also, as additional evidence to verify the presence of O‐vacancy, the high‐resolution O 1s XPS spectrum for NiO/CeO 2 NW@CC in Figure 2f presented a much more apparent oxygen vacancies‐associated O2‐peak signal.…”

Section: Resultsmentioning

confidence: 99%

“…Unlike the transition metal borides, chalcogenides, and phosphides, rare earth metal oxides (RMOs) are quite chemically stable during electrochemical reaction in alkaline electrolytes. [ 33 ] In addition, some RMOs can share a similar crystallographic system with TMOs. Taking NiO and CeO 2 as an example, the theoretical lattice mismatch between them is 23%.…”

Section: Introductionmentioning

confidence: 99%

Pseudo‐Periodically Coupling NiO Lattice with CeO Lattice in Ultrathin Heteronanowire Arrays for Efficient Water Oxidation

Yang

Dai

Chen

et al. 2021

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Transition metal oxides (TMOs) have been under the spotlight as promising precatalysts for electrochemical oxygen evolution reaction (OER) in alkaline media. However, the slow and incomplete self‐reconstruction from TMOs to (oxy)hydroxides as well as the formed (oxy)hydroxides with unmodified electronic structure gives rise to the inferior OER performance to the noble metal oxide ones. Herein, a unique dual metal oxides lattice coupling strategy is proposed to fabricate carbon cloth‐supported ultrathin nanowires arrays, which are composed of pseudo‐periodically welded NiO with CeO2 nanocrystals (NiO/CeO2 NW@CC). When served as an OER precatalyst in 1.0 m KOH, the NiO/CeO2 NW@CC shows an ultralow overpotential of 330 mV at 50 mA cm−2, along with an impressive cycle durability of more than 3 days even at 50 mA cm−2, surpassing CC‐supported NiO and commercial IrO2 catalysts. The combined experimental and theoretical investigations unveil that the atomic coupling of CeO2 can not only appreciably trigger the generation of oxygen vacancies and expedite phase transformation of NiO into active NiOOH, but also in situ create a chemical bond with the formed NiOOH and enable the electron injection, thus effectively inhibiting the aggregation of the accessible NiOOH nanodomains and optimizing their reaction free energy towards oxygen‐containing intermediates.

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Hybrid Nanosheet Arrays: Boosting Activity on Co₄N Porous Nanosheet by Coupling CeO₂ for Efficient Electrochemical Overall Water Splitting at High Current Densities (Adv. Funct. Mater. 32/2020)

Cited by 39 publications

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Hierarchically Assembling CoFe Prussian Blue Analogue Nanocubes on CoP Nanosheets as Highly Efficient Electrocatalysts for Overall Water Splitting

Hierarchically Assembling CoFe Prussian Blue Analogue Nanocubes on CoP Nanosheets as Highly Efficient Electrocatalysts for Overall Water Splitting

Uncovering the Promotion of CeO₂/CoS_1.97 Heterostructure with Specific Spatial Architectures on Oxygen Evolution Reaction

Pseudo‐Periodically Coupling NiO Lattice with CeO Lattice in Ultrathin Heteronanowire Arrays for Efficient Water Oxidation

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Hybrid Nanosheet Arrays: Boosting Activity on Co4N Porous Nanosheet by Coupling CeO2 for Efficient Electrochemical Overall Water Splitting at High Current Densities (Adv. Funct. Mater. 32/2020)

Cited by 39 publications

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Hierarchically Assembling CoFe Prussian Blue Analogue Nanocubes on CoP Nanosheets as Highly Efficient Electrocatalysts for Overall Water Splitting

Hierarchically Assembling CoFe Prussian Blue Analogue Nanocubes on CoP Nanosheets as Highly Efficient Electrocatalysts for Overall Water Splitting

Uncovering the Promotion of CeO2/CoS1.97 Heterostructure with Specific Spatial Architectures on Oxygen Evolution Reaction

Pseudo‐Periodically Coupling NiO Lattice with CeO Lattice in Ultrathin Heteronanowire Arrays for Efficient Water Oxidation

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Hybrid Nanosheet Arrays: Boosting Activity on Co₄N Porous Nanosheet by Coupling CeO₂ for Efficient Electrochemical Overall Water Splitting at High Current Densities (Adv. Funct. Mater. 32/2020)

Uncovering the Promotion of CeO₂/CoS_1.97 Heterostructure with Specific Spatial Architectures on Oxygen Evolution Reaction