Preparation of CoNi high surface area porous foams by substrate controlled electrodeposition

Rafailović, Lidija D.; Gammer, Christoph; Rentenberger, Christian; Kleber, Christoph; Whitehead, Adam; Gollas, Bernhard; Karnthaler, H. P.

doi:10.1039/c1cp22503k

Cited by 15 publications

(6 citation statements)

References 37 publications

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“…This indicates that the photothermal effect can greatly increase the wetting ability of the photoanode (Figure S30, the Supporting Information), which in turn decreases the bubble adhesion as well as the radius at which bubbles detach from the surface. [ 25 ] In our experiments, small O 2 bubbles are densely and uniformly generated on the surface of photoanode with small size upon NIR light irradiation (Movie S1, the Supporting Information), which are clearly evident in the digital images of the NFCB photoanode with or without NIR irradiation at the same current density for the O 2 evolution process ( Figure ). Moreover, the O 2 bubble release time of the NFCB photoanode calculated from the recorded video was 5 min, which decreased to 34 s when the NIR light was turned on, as shown in Movie S2 in the Supporting Information.…”

Section: Figurementioning

confidence: 72%

General and Robust Photothermal‐Heating‐Enabled High‐Efficiency Photoelectrochemical Water Splitting

et al. 2021

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However, its STH efficiency is greatly plagued by its limited light absorption, poor charge transport, and sluggish water oxidation kinetics. [2] In this context, recent research has focused on overcoming these intrinsic issues, including N 2 or H 2 treatment for improved light harvesting, [3] heteroatom doping for increasing charge carrier densities and thus charge transport, [4] and oxygen evolution cocatalyst (OEC) loading for facilitating the reaction kinetics. [5] Despite the effectiveness of the above methods, a simple route to synchronously improve the three processes for enhanced PEC photoanode performance of photoanode is highly desirable. This has yet to be largely explored.The operation temperature has been proven to be exert a profound influence on the bandgap of semiconductors, hole diffusion length of photoanodes and electrocatalytic properties of OECs. [6] For example, the absorption band of semiconductor quantum dots was found to exhibit a red shift with increasing temperature. [7] Minority carrier hopping was activated within BVO photoanodes via a moderate temperature elevation of the electrolyte, resulting in efficient bulk charge separation. [8] Furthermore, the electrocatalytic performance of OECs could be greatly enhanced by magnetic heating in an external high-frequency alternating magnetic field. [9] Inspired by the above intriguing results, it The ability of photoanodes to simultaneously tailor light absorption, charge separation, and water oxidation processes represents an important endeavor toward highly efficient photoelectrochemical (PEC) water splitting. Here, a robust strategy is reported to render markedly improved PEC water splitting via sandwiching a photothermal Co 3 O 4 layer between a BiVO 4 photoanode film and an FeOOH/NiOOH electrocatalyst sheet. The deposited Co 3 O 4 layer manifests compelling photothermal effect upon near-infrared irradiation and raises the temperature of the photoanodes in situ, leading to extended light absorption, enhanced charge transfer, and accelerated water oxidation kinetics simultaneously. The judiciously designed NiOOH/ FeOOH/Co 3 O 4 /BiVO 4 photoanode renders a superior photocurrent density of 6.34 mA cm -2 at 1.23 V versus a reversible reference electrode (V RHE ) with outstanding applied bias photon-to-current efficiency of 2.72% at 0.6 V RHE . In addition to the metal oxide, a wide variety of metal sulfides, nitrides, and phosphides (e.g., CoS, CoN, and CoP) can be exploited as the heaters to yield high-performance BiVO 4 -based photoanodes. Apart from BiVO 4 , other metal oxides (e.g., Fe 2 O 3 and TiO 2 ) can also be covered by photothermal materials to impart significantly promoted water splitting. This simple yet general strategy provides a unique platform to capitalize on their photothermal characteristics to engineer high-performing energy conversion and storage materials and devices.

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Section: Figurementioning

confidence: 72%

General and Robust Photothermal‐Heating‐Enabled High‐Efficiency Photoelectrochemical Water Splitting

et al. 2021

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“…The most practical approach to overcome the kinetic and diffusional limitations is to increase the real surface area of the electrode. Several studies on CoNi alloys report performance of submicron size powder electrodes, 22 porous foams, 23 or even encapsulating CoNi nanoalloys in ultrathin layers of graphene. 24 Unlike other attempts to replace precious-metal-based electrocatalysts of HER, lowering efficiency and stability of such compounds, CoNi@C fabricated by Deng et al 24 are claimed to possess high performance.…”

Section: Introductionmentioning

confidence: 99%

Catalytic impact of alloyed Al on the corrosion behavior of Co₅₀Ni₂₃Ga₂₆Al_1.0magnetic shape memory alloy and catalysis applications for efficient electrochemical H₂generation

et al. 2017

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The electrochemical and corrosion behaviour of Co 50 Ni 23 Ga 27Àx Al x (x ¼ 0 and 1.0 wt%) magnetic shape memory alloys (MSMAs) was studied in 0.5 M NaCl solutions using various electrochemical techniques.Results showed remarkable activation of the tested MSMA toward pitting corrosion upon alloying it with Al. XPS examination confirmed the activation influence of alloyed Al. It proved that the presence of Al in the alloy's matrix weakens its passivity, as manifested by a lower amount of gallium oxides and Cl and FE $ 100%). Our best catalyst also showed good stability and durability after 3000 cycles of cathodic polarization between the corrosion potential (E corr ) and À1.0 V vs. RHE, and 24 h of electrolysis at a high cathodic current density of 100 mA cm À2. Microstructure changes made by Al, together with findings obtained from SEM/EDX mapping and XPS studies, were used to interpret its activation influence towards the HER.

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“…Therefore, it is expected that H 2 bubbles coalesce into the growing Ni layer and represent the barrier for further metal growth (cf. Figure III). , The presence of H 2 bubbles will lead to reduced adhesion of the Ni@rGO layer to the CFRP substrate. This is supported by the fact that the porous Ni@rGO composite foil detaches easily from rGO@CFRP.…”

Section: Results and Discussionmentioning

confidence: 99%

New Insights into the Metallization of Graphene-Supported Composite Materials─from 3D Cu-Grown Structures to Free-Standing Electrodeposited Porous Ni Foils

et al. 2022

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The conductivity and the state of the surface of supports are of vital importance for metallization via electrodeposition. In this study, we show that the metallization of a carbon fiber-reinforced polymer (CFRP) can be carried out directly if the intermediate graphene oxide (GO) layer is chemically reduced on the CFRP surface. Notably, this approach utilizing only the chemically reduced GO as a conductive support allows us to obtain insights into the interaction of rGO and the electrodeposited metal. Our study reveals that under the same contact current experimental conditions, the electrodeposition of Cu and Ni on rGO follows significantly different deposition modes, resulting in the formation of three-dimensional (3D) and free-standing metallic foils, respectively. Considering that Ni adsorption energy is larger than Ni cohesive energy, it is expected that the adhesion of Ni on rGO@CFRP is enhanced compared to Cu. In contrast, the adhesion of deposited Ni is reduced, suggesting diffusion of H+ between rGO and CFRP, which promotes the hydrogen evolution reaction (HER) and results in the formation of free-standing Ni foils. We ascribe this phenomenon to the unique properties of rGO and the nature of Cu and Ni deposition from electrolytic baths. In the latter, the high adsorption energy of Ni on defective rGO along with HER is the key factor for the formation of the porous layer and free-standing foils.

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Preparation of CoNi high surface area porous foams by substrate controlled electrodeposition

Cited by 15 publications

References 37 publications

General and Robust Photothermal‐Heating‐Enabled High‐Efficiency Photoelectrochemical Water Splitting

General and Robust Photothermal‐Heating‐Enabled High‐Efficiency Photoelectrochemical Water Splitting

Catalytic impact of alloyed Al on the corrosion behavior of Co₅₀Ni₂₃Ga₂₆Al_1.0magnetic shape memory alloy and catalysis applications for efficient electrochemical H₂generation

New Insights into the Metallization of Graphene-Supported Composite Materials─from 3D Cu-Grown Structures to Free-Standing Electrodeposited Porous Ni Foils

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Preparation of CoNi high surface area porous foams by substrate controlled electrodeposition

Cited by 15 publications

References 37 publications

General and Robust Photothermal‐Heating‐Enabled High‐Efficiency Photoelectrochemical Water Splitting

General and Robust Photothermal‐Heating‐Enabled High‐Efficiency Photoelectrochemical Water Splitting

Catalytic impact of alloyed Al on the corrosion behavior of Co50Ni23Ga26Al1.0magnetic shape memory alloy and catalysis applications for efficient electrochemical H2generation

New Insights into the Metallization of Graphene-Supported Composite Materials─from 3D Cu-Grown Structures to Free-Standing Electrodeposited Porous Ni Foils

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Catalytic impact of alloyed Al on the corrosion behavior of Co₅₀Ni₂₃Ga₂₆Al_1.0magnetic shape memory alloy and catalysis applications for efficient electrochemical H₂generation