Auto-programmed synthesis of metallic aerogels: Core-shell Cu@Fe@Ni aerogels for efficient oxygen evolution reaction

Jiang, Bo; Wan, Zhe; Kang, Yunqing; Guo, Yanna; Henzie, Joel; Na, Jongbeom; Li, Hexing; Wang, Shengyao; Bandô, Yoshio; Sakka, Yoshio; Yamauchi, Yusuke

doi:10.1016/j.nanoen.2020.105644

Cited by 61 publications

(30 citation statements)

References 39 publications

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“…The outstanding OER performance of CLDH/CP/CF is further confirmed in comparison with many of the Cu‐based OER electrocatalysts reported recently (Table S2, Supporting Information), for example, the CuO x NWs@NiMnO x NSs/CF, [ 36 ] CuNi@Ni(ON)/CNTs‐Gr, [ 37 ] and EA‐Cu@Fe@Ni. [ 38 ]…”

Section: Resultsmentioning

confidence: 99%

“…The outstanding OER performance of CLDH/CP/CF is further confirmed in comparison with many of the Cu-based OER electrocatalysts reported recently (Table S2, Supporting Information), for example, the CuO x NWs@NiMnO x NSs/CF, [36] CuNi@Ni(ON)/CNTs-Gr, [37] and EA-Cu@Fe@Ni. [38] To study the intrinsic OER electrocatalytic activity, the EDLC was tested in the non-faradaic region between 1.152 and 1.182 V versus RHE (Figure S23, Supporting Information). It is found that the CP/CF itself has a large EDLC of 196 mF cm −2 close to that of the previously reported Cu 2 O-CF (194 mF cm −2 ).…”

Section: Her and Oer Performancesmentioning

confidence: 99%

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Assembly of Cobalt Layered Double Hydroxide on Cuprous Phosphide Nanowire with Strong Built‐In Potential for Accelerated Overall Water Splitting

Cao

You

et al. 2021

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evolution reaction (HER) and anodic oxygen evolution reaction (OER) require abundant, cheap, stable, and efficient electrocatalysts. In the past years, huge efforts have been devoted to the development of low-cost electrocatalysts based on transition metals. In general, transition metals, [4] and their nitrides, [5] phosphides, [6] and sulfides, [7] exhibit effective catalytic activity for HER in pH-universal electrolytes, while metallic oxides, [8] and hydroxides, [9] are predominantly alkaline OER electrocatalysts. Nevertheless, it is still difficult to integrate HER and OER in a common electrolyzer due to that most OER electrocatalysts are inactive or corroded in acid media. [10] In this regard, it is crucial to develop cost-effective bifunctional electrocatalysts toward both HER and OER in alkaline media. Up to date, numerous bifunctional electrocatalysts composed of two or more active components have been designed and prepared via interfacial engineering, such as metal-semiconductor Mott-Schottky heterojunctions, [11] heterogeneous sulfides, [12] and phosphides hybrids. [13] These heterogeneous electrocatalysts usually possess the advantages of each component and exhibit vastly improved electrocatalytic performance because of the modified electronic structure in the vicinity of interfaces.Whereas, how to design and synthesize heterogeneous bifunctional electrocatalysts is still lacking systematic reports. Recently, it has been demonstrated that n-type semiconductor catalysts favor cathodic HER and p-type ones prefer anodic OER. [14] On account of this view, it is envisaged that integrating an n-type semiconductor and a p-type one would bring about bifunctional HER and OER electrocatalyst. As is well known, upon intimate contact of p-type and n-type semiconductors to form p-n junction, their Fermi levels turn to be aligned, leading to the formation of the opposite space-charge region at the interface. [15] This changed electronic structure has a great influence on the absorption of target ions and the charge transfer during electrochemical reactions. [16] Specifically, the positively charged n-type side is in favor of the absorption of OH − ions to facilitate OER. [17] Though it has been concluded that the enriched electron density on a metal surface could lead to the stabilization of adsorbed hydrogen for enhanced HER, [18] how the negatively charged p-type side affects HER is still unknown. Heterostructure plays an important role in boostingthe overall water splitting (OWS) performance of nonprecious metal electrocatalysts. However, rational design and synthesis of semiconductor heterojunctions especially for Cu-based ones as efficient bifunctional electrocatalysts toward hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) still face challenges, and the in-depth study of catalytic mechanisms is urgently needed. Herein, n-type cobalt layered double hydroxide nanosheets are assembled on p-type cuprous phosphide nanowire to form p-n junction. This heterostructure with a strong built-in potent...

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Section: Resultsmentioning

confidence: 99%

Section: Her and Oer Performancesmentioning

confidence: 99%

Assembly of Cobalt Layered Double Hydroxide on Cuprous Phosphide Nanowire with Strong Built‐In Potential for Accelerated Overall Water Splitting

Cao

You

et al. 2021

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“…From the deconvoluted Ni 2p spectrum, the oxidized Ni species in the used Pt–Ni/C exhibit a higher relative ratio (2.0) compared to the fresh sample (Figure S19a) owing to the interaction between alkali and Ni during cycling to create more oxidized Ni species to function as active centers for the conversion of hydrocarbon intermediates during the MOR catalysis process. − However, the Pt 2p spectrum for the used Pt–Ni/C in Figure S19b has no obvious change after the stability test compared to its initial state, indicating the good chemical and electrocatalytic stability of Pt. Similarly, the strong interaction between Pt NPs and Ni/C contributes to the stable anchoring Pt from leaching, and the synergistic effect promotes the removal of hydrocarbon intermediates around Pt, which results in the high electrocatalytic stability of Pt/Ni–C in MOR.…”

Section: Results and Discussionmentioning

confidence: 99%

Pt Nanoparticles Dispersed on Ni/C Nanoflowers as Stable Electrocatalysts for Methanol Oxidation and Oxygen Reduction

Gao

Wan

et al. 2021

ACS Appl. Nano Mater.

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Improving the utilization of Pt by incorporating it in carbon-based materials is a feasible approach to overcome its disadvantages of low abundance and high cost for high-performance electrocatalysis. Herein, we propose a facile strategy to design a highly stable electrocatalyst of Pt−Ni/C by in situ loading Pt nanoparticles with a low ratio of 9.4 wt % onto the Ni/C support. Derived from Ni-based metal−organic frameworks (Ni-MOFs), the three-dimensional porous structure of Ni/C provides a large surface area and uniformly distributed Ni nanoparticles in carbon matrix to facilitate the formation and anchoring of Pt nanoparticles with good adhesion, ultrafine dispersion, and better stability. Benefiting from the good synergistic effect between Pt and Ni/C, this bifunctional Pt−Ni/C electrocatalyst shows outstanding stability toward both oxygen reduction and methanol oxidation reactions during the accelerated durability tests and exhibits improved activity nearly 2 times larger than that of commercial Pt/C. Moreover, the strategy is also employed to prepare different bifunctional electrocatalysts of Pd−Ni/C and Ru−Ni/C with satisfactory results. Therefore, the bifunctional electrocatalysts of M (Pt, Pd, Ru)−Ni/C developed from this in situ loading strategy are expected to be robust electrocatalysts for practical applications in direct methanol fuel cells.

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“…[17,18] Nanostructure fabrication is a notable approach for reducing Ir use without losing catalytic activity. [19][20][21][22] For example, Tan et al used IrO x catalysts in the form of nanoparticles to achieve high catalytic performance with a small amount of Ir: a potential, E j=10 , of 1.48 V at an operating current of 10 mA cm −2 , and a mass activity of 1400 A g Ir −1 . [19] In a study by Böhm et al, a matrix consisting of porous antimony-doped, tin-oxide microparticles embedded with IrO x nanoparticles exhibited a potential of 1.47 V at 1 mA cm −2 , which was ≈50 mV lower than that of the Ir nanoparticle catalyst.…”

Section: Introductionmentioning

confidence: 99%

“…Nanostructure fabrication is a notable approach for reducing Ir use without losing catalytic activity. [ 19 , 20 , 21 , 22 ] For example, Tan et al. used IrO x catalysts in the form of nanoparticles to achieve high catalytic performance with a small amount of Ir: a potential, E j =10 , of 1.48 V at an operating current of 10 mA cm −2 , and a mass activity of 1400 A g Ir −1 .…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient and Stable Iridium Oxygen Evolution Reaction Electrocatalysts Based on Porous Nickel Nanotube Template Enabling Tandem Devices with Solar‐to‐Hydrogen Conversion Efficiency Exceeding 10%

et al. 2022

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Ir is one of the most efficient oxygen evolution reaction (OER) catalysts; however, it is also one of the rarest and most expensive elements. Therefore, it is highly desirable to develop Ir catalysts with nanostructures that reduce Ir consumption by maximizing the surface‐to‐volume ratio without limiting the mass transport of reactants and products of reactions. Ir OER catalysts on a template that consisted of porous nanotubes (PNTs) based on Ni are fabricated. The Ir/Ni PNTs offer multiple benefits, including high catalytic performance (potential of 1.500 V vs. reversible hydrogen electrode (RHE) at an operating current density of 10 mA cm−2 and Tafel slope of 44.34 mV decade−1), minimal use of Ir (mass activity of 3273 A g−1 at 1.53 V vs RHE), and facile mass transport through the NT‐sidewall pores (stable operation for more than 10 h). The Ir/Ni PNTs are also applied to a tandem device, consisting of a Cu(In,Ga)Se2‐based photocathode and halide perovskite photovoltaic cell, for unassisted water splitting. A solar‐to‐hydrogen conversion efficiency that exceeded 10% is also demonstrated, which is nearly 1% point greater than when a planar Ir film is used as the anode instead of Ir/Ni PNTs.

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Auto-programmed synthesis of metallic aerogels: Core-shell Cu@Fe@Ni aerogels for efficient oxygen evolution reaction

Cited by 61 publications

References 39 publications

Assembly of Cobalt Layered Double Hydroxide on Cuprous Phosphide Nanowire with Strong Built‐In Potential for Accelerated Overall Water Splitting

Assembly of Cobalt Layered Double Hydroxide on Cuprous Phosphide Nanowire with Strong Built‐In Potential for Accelerated Overall Water Splitting

Pt Nanoparticles Dispersed on Ni/C Nanoflowers as Stable Electrocatalysts for Methanol Oxidation and Oxygen Reduction

Highly Efficient and Stable Iridium Oxygen Evolution Reaction Electrocatalysts Based on Porous Nickel Nanotube Template Enabling Tandem Devices with Solar‐to‐Hydrogen Conversion Efficiency Exceeding 10%

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