Improving the electrocatalytic activity for formic acid oxidation of bimetallic Ir–Zn nanoparticles decorated on graphene nanoplatelets

Azam, Adam Mohd Izhan Noor; Isahak, Wan Nor Roslam Wan; Zainoodin, Azran Mohd; Masdar, Mohd Shahbudin

doi:10.1088/2053-1591/ab6c95

Cited by 10 publications

(5 citation statements)

References 37 publications

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“…The Ir 4f high resolution XPS spectra (Figure S2a, Supporting Information) were fitted into the metallic state (Ir 0 ) and oxidation state (Ir 3+ ) and Ir 4f peaks shift to a lower value after alloying with V, indicating the electronic structures of Ir were tuned by V element. [ 20 ] The Ir 4f peaks of O ‐(Ir 0.9 Pd 0.1 ) 3 V/C show no obvious differences from O H ‐Ir 3 V/C, suggesting that Pd played a minor role in affecting the electronic structures of Ir. The V 2p high resolution XPS spectra (Figure S2b, Supporting Information) show that V mainly presents with the oxidized state on both O ‐(Ir 0.9 Pd 0.1 ) 3 V/C and O H ‐Ir 3 V/C.…”

Section: Resultsmentioning

confidence: 99%

Engineering Ir Atomic Configuration for Switching the Pathway of Formic Acid Electrooxidation Reaction

Shen

Chen

Zhang

et al. 2021

Adv Funct Materials

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Switching the formic acid oxidation reaction (FAOR) pathway from CO intermediate to direct CO 2 formation is essential for noble-metal electrocatalysts, but rare investigations on Ir-based materials. Herein, the atomic configurations of Ir are controlled to enhance the FAOR performance via Ir 3 V intermetallics (O-Ir 3 V). As the ordering degree of O-Ir 3 V increases, the Ir ensemble size decreases to trimer and dimer, leading to a 7.3 times promotion in mass normalized activity relative to Ir. Supported by electrochemical in situ attenuated total reflection infrared spectroscopy results, it shows that FAOR occurs via linear CO mediated pathway on Ir, but it is totally switched to a direct pathway on highly ordered O-Ir 3 V. The preserved ordered structure and V oxides on the surface during the durability test contribute to the enhanced stability. This study provides an idea to switch the FAOR pathway through tuning the Ir atom configuration by constructing ordered intermetallics.

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Section: Resultsmentioning

confidence: 99%

Engineering Ir Atomic Configuration for Switching the Pathway of Formic Acid Electrooxidation Reaction

Shen

Chen

Zhang

et al. 2021

Adv Funct Materials

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“…The combination of Ir and other metals can improve the FAOR property, such as PtIr, 248 PdIr, 249 PtIrCu, 250 PdAgIr, 251 and IrZn 252 nanocomposites. These works mainly follow the key point of surface electronic state regulation of Ir.…”

Section: Electrocatalytic Oxidation Reactionmentioning

confidence: 99%

Iridium‐based electrocatalysts toward sustainable energy conversion

Huang

Zhao

2022

EcoMat

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Electrocatalysis is an important branch in electrochemistry and also has a significant position in energy storage/conversion. Iridium (Ir)-based electrocatalysts show promise because of the inherent redox property. Considering the abundance and expensive cost of such noble metal, significant efforts have been made to rationally improve the electrochemical performance of Ir-based electrocatalysts during these years from the viewpoints of structural design and kinetic analysis. Most of the reports may aim to achieve high Ir atomic utilization with more exposed active sites, and both high electrochemical activity and durable stability are expected. In this case, Ir-based single atoms, nanostructures, and composites are reported with various electrocatalytic applications of water splitting (involving hydrogen evolution and oxygen evolution reaction) and other electrocatalytic oxidation reactions (involving hydrogen oxidation reaction, methanol oxidation reaction, ammonia oxidation reaction, and formic acid oxidation reaction) as well as other electrocatalytic reduction reactions (involving oxygen reduction reaction, carbon dioxide reduction reaction, and nitrogen reduction reaction). These works deserve to be discussed and this review article comprehensively summarized the most significant reports. We analyzed Ir-based electrocatalysts from the viewpoints of synthesis, structure, electrochemical property, and reaction mechanism. The challenges and outlooks in the future were also provided from the aspects of fundamental studies and industrial applications, which may attract more attention and provide new insight into the design of advanced Ir-based electrocatalysts with high performance.

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“…Another work explored the fabrication of graphene nanoplatelet (GNP)-supported Ir–Zn catalysts [ 146 ]. These catalysts were prepared in various Ir:Zn ratios by H 2 reduction.…”

Section: Pt and Pd-free Materials For Formic Acid/formate Electrooxidationmentioning

confidence: 99%

Benchmarking Catalysts for Formic Acid/Formate Electrooxidation

et al. 2021

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Energy production and consumption without the use of fossil fuels are amongst the biggest challenges currently facing humankind and the scientific community. Huge efforts have been invested in creating technologies that enable closed carbon or carbon neutral fuel cycles, limiting CO2 emissions into the atmosphere. Formic acid/formate (FA) has attracted intense interest as a liquid fuel over the last half century, giving rise to a plethora of studies on catalysts for its efficient electrocatalytic oxidation for usage in fuel cells. However, new catalysts and catalytic systems are often difficult to compare because of the variability in conditions and catalyst parameters examined. In this review, we discuss the extensive literature on FA electrooxidation using platinum, palladium and non-platinum group metal-based catalysts, the conditions typically employed in formate electrooxidation and the main electrochemical parameters for the comparison of anodic electrocatalysts to be applied in a FA fuel cell. We focused on the electrocatalytic performance in terms of onset potential and peak current density obtained during cyclic voltammetry measurements and on catalyst stability. Moreover, we handpicked a list of the most relevant examples that can be used for benchmarking and referencing future developments in the field.

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Improving the electrocatalytic activity for formic acid oxidation of bimetallic Ir–Zn nanoparticles decorated on graphene nanoplatelets

Cited by 10 publications

References 37 publications

Engineering Ir Atomic Configuration for Switching the Pathway of Formic Acid Electrooxidation Reaction

Engineering Ir Atomic Configuration for Switching the Pathway of Formic Acid Electrooxidation Reaction

Iridium‐based electrocatalysts toward sustainable energy conversion

Benchmarking Catalysts for Formic Acid/Formate Electrooxidation

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