Monolithic nanoporous Ni Fe alloy by dealloying laser processed Ni Fe Al as electrocatalyst toward oxygen evolution reaction

Cui, Xiaodan; Zhang, Boliang; Zeng, Congyuan; Wen, Hao; Guo, Shengmin

doi:10.1016/j.ijhydene.2018.06.109

Cited by 42 publications

(29 citation statements)

References 75 publications

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“…There is some literature precedence for the design of nanoporous metals formed through dealloying multicomponent alloys for use as OER electrocatalysts. [ 11,21–24 ] Dealloying is defined as the selective chemical/electrochemical etching of a sacrificial component(s) from a multi‐component alloy, evolving an open, bicontinuous, and high aspect ratio nanoporosity. [ 34–36 ] The specific utility of nanoporous metals for catalyzing the OER is their nanostructured morphology yielding a highly defected catalyst surface, [ 11,37,38 ] a high surface area‐to‐volume ratio to maximize precious metal utilization, and high electronic conductivity due to an interconnected metallic backbone.…”

Section: Resultsmentioning

confidence: 99%

“…[ 34–36 ] The specific utility of nanoporous metals for catalyzing the OER is their nanostructured morphology yielding a highly defected catalyst surface, [ 11,37,38 ] a high surface area‐to‐volume ratio to maximize precious metal utilization, and high electronic conductivity due to an interconnected metallic backbone. [ 11,24 ] While promising results have been shown in the half‐cell, [ 11,21–24 ] the standard morphology of these nanoporous catalysts is that of a thin film. This type of morphology cannot be readily incorporated into the anode catalyst layer of PEMWE MEAs.…”

Section: Resultsmentioning

confidence: 99%

“…Recent work on bicontinuous materials, namely nanoporous metals, have shown that the combination of the high surface‐to‐volume ratio, consequent high electrochemically active surface area (ECSA), and a continuous metallic backbone, result in high mass normalized activity and low electrode resistivity. [ 21–24 ] Utility of this anode electrocatalyst architecture is currently limited, due to issues associated with direct integration of nanoporous metals into PEMWE catalyst layers. The challenges with this morphology include the brittleness of nanoporous metals, [ 25,26 ] and the impact of nanoporosity tortuosity on water and gas transport, limiting catalyst utilization.…”

Section: Introductionmentioning

confidence: 99%

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Nanoporous Iridium Nanosheets for Polymer Electrolyte Membrane Electrolysis

Chatterjee

Peng

Intikhab

et al. 2021

Advanced Energy Materials

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The growth of the hydrogen economy is predicated on advancements in electrochemical energy technologies, with water electrolysis as a key component to the technological portfolio. Much of the focus on anode catalyst development for polymer electrolyte membrane water electrolyzers (PEMWE) is centered on activity as controlled by compositional and morphological impacts on reactant/intermediate/product adsorption. However, the effectiveness of this strategy is found to be limited upon integration of these materials into PEMWE membrane electrode assemblies (MEA). Regardless of catalyst activity, the combination of electrode inhomogeneity, ionomer integration, and high density of oxide–oxide interfaces yields significant performance losses associated with poor catalytic electrode conductivity. Here many of these limitations are addressed through the development of a unique catalyst morphology composed of nanoporous Ir nanosheets (npIrx‐NS) that exhibit high catalytic activity for the anodic oxygen evolution reaction and superior electrode electronic conductivity in comparison to a commercial IrO2 nanoparticle catalyst. The utility of the npIrx‐NS is demonstrated through incorporation into PEMWE MEAs where their performance exceeds that of commercial catalyst coated membranes at loadings as low as 0.06 mgIr cm−2 while exhibiting a negligible loss in performance following 50 000 accelerated stress test cycles.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nanoporous Iridium Nanosheets for Polymer Electrolyte Membrane Electrolysis

Chatterjee

Peng

Intikhab

et al. 2021

Advanced Energy Materials

View full text Add to dashboard Cite

show abstract

“…Generally, by increasing the active area of electrode or combining with other electrocatalytic elements, the electrocatalytic activity can be increased. [ 28,40 ]…”

Section: Nife‐based Oer Electrocatalystsmentioning

confidence: 99%

Recent Progress on NiFe‐Based Electrocatalysts for Alkaline Oxygen Evolution

Gong

Yang

Douka

et al. 2020

Advanced Sustainable Systems

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The oxygen evolution reaction (OER) is significant for energy conversion and storage technologies. However, efficient electrocatalysts are required to overcome its sluggish kinetics. Recently, NiFe‐based composites have shown to be promising electrocatalysts for alkaline OER, and numerous efforts have been invested in the development of low‐cost and advanced NiFe‐based nanostructures. In this mini review, the latest developments in NiFe‐based electrocatalysts are summarized and discussed. Following the introduction of the OER mechanism, different NiFe electrocatalysts in alloys, (hydr)oxides, and other derived compounds are successively introduced. Moreover, the synthesis methods of typical layered NiFe hydroxide structures are also introduced. Finally, recent progress is summarized and some perspectives are provided for addressing future challenges for NiFe‐based electrocatalysts. It is believed that this review may provide useful reference for the future design and preparation of NiFe compounds for the alkaline OER and beyond.

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“…Since the specific surface area of a catalyst has a great influence on its catalytic activity, two strategies are commonly used to obtain catalysts with high specific surface area [10–13] . One is to synthesize catalysts with different structures and small sizes directly, such as small size nanowires/nanorods, [9,14] nanotubes [15] and nanopores [16] . The second is to add surfactants or other components in the process of catalyst synthesis, and then remove them by other means to synthesize the catalyst with a porous structure.…”

Section: Introductionmentioning

confidence: 99%

In‐situ Surface‐selective Removal of Al Element from NiFeAl Ternary Nanowires for Large‐current Oxygen Evolution Reaction

Zhang

Shen

et al. 2021

ChemNanoMat

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To store renewable energy via water splitting, it is crucial to design low‐cost and high‐performance catalysts for oxygen evolution reaction (OER). In this work, a ternary nanowire supported on nickel foam (NiFeAl‐NW/NF) with high specific surface area and catalytic activity was prepared by hydrothermal method and in‐situ selective surface removal. High OER current densities of 100, 500 and 1000 mA ⋅ cm−2 were achieved under anode potentials of 1.52, 1.56 and 1.60 V vs. RHE, respectively. The NiFeAl‐NW/NF was stable under 1 A cm−2 OER current density in the 40 hour durability test. In situ surface selective removal of aluminum from nanowires provides abundant structural defects, which effectively enlarge the electrochemically surface area of the integral catalyst suitable for large‐current oxygen evolution reaction (OER).

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Monolithic nanoporous Ni Fe alloy by dealloying laser processed Ni Fe Al as electrocatalyst toward oxygen evolution reaction

Cited by 42 publications

References 75 publications

Nanoporous Iridium Nanosheets for Polymer Electrolyte Membrane Electrolysis

Nanoporous Iridium Nanosheets for Polymer Electrolyte Membrane Electrolysis

Recent Progress on NiFe‐Based Electrocatalysts for Alkaline Oxygen Evolution

In‐situ Surface‐selective Removal of Al Element from NiFeAl Ternary Nanowires for Large‐current Oxygen Evolution Reaction

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