Modulating reaction pathways of formic acid oxidation for optimized electrocatalytic performance of PtAu/CoNC

Liang, Mengchao; Xia, Tianyu; Gao, Han; Zhao, Kai; Cao, Tianqi; Deng, Meng; Ren, Xiaoyan; Li, Shunfang; Guo, Haizhong; Wang, Rongming

doi:10.1007/s12274-021-3629-z

Cited by 33 publications

(26 citation statements)

References 54 publications

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“…The main source of the electrical energy in a DFAFC is electrooxidation reaction of formic acid at the anode side. It is well established now that the electrooxidation of the formic acid takes place via a dual pathway including either a direct pathway (dehydrogenation) or indirect pathway (dehydration) [21,41,42] . The two mechanisms were first proposed by Capon and Parson in 1973 [43–45] .…”

Section: Fundamentals Of Fao Reactionmentioning

confidence: 99%

“…Previous efforts in improving FAOR efficiency mainly focused on (1) modifying the electronic structure of palladium/platinum with other elements (for example, gold, bismuth, copper, nickel and tin), (2) controlling the shape and exposed facets of palladium/platinum nanocrystals and (3) fabricating hollow/framed/ultrathin high‐specific‐area palladium/platinum nanostructures. The enhancement effect in the binary catalysts generally results from (1) steric or ensemble or geometric effect [125–127] (2) electronic effect [72,99,128] (3) bifunctional mechanism (synergic effect) [41,62,129] . However, the prevalence and the extent of these effects in an electrocatalyst depend chemical nature of the adatom, morphology and structure, chemical composition and particle size distribution.…”

Section: Anode Catalysts For Formic Acid Oxidationmentioning

confidence: 99%

“…[21,40] It is believed that the indirect pathway is favored at Pt surface, whereas the direct pathway takes place predominantly at the Pd surface. [41,47,52] The reason why Pd favors direct and Pt favors indirect is speculated to be due to the multi-step process of the FAO, the formation adsorbed formate intermediate. This could also be linked to that CO tends to adsorb preferentially on Pt anode surfaces, which facilitates the oxidation step to CO 2 in the indirect mechanism [51,53] The mechanism of HOOCH oxidation over the platinum metal has been dealt with quite intensively in the literature.…”

Section: Kineticsmentioning

confidence: 99%

“…The enhancement effect in the binary catalysts generally results from (1) steric or ensemble or geometric effect [125][126][127] (2) electronic effect [72,99,128] (3) bifunctional mechanism (synergic effect). [41,62,129] However, the prevalence and the extent of these effects in an electrocatalyst depend chemical nature of the adatom, morphology and structure, chemical composition and particle size distribution. Table 1 summarizes the structural features and electrocatalytic activities of some of the most active binary electrode catalysts for FAO reported recently.…”

Section: Bimetallic Catalystsmentioning

confidence: 99%

See 3 more Smart Citations

Recent Advances in Anode Electrocatalysts for Direct Formic Acid Fuel Cells – Part I – Fundamentals and Pd Based Catalysts

Hossain

Saleem

Alwi

et al. 2022

The Chemical Record

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Direct formic acid fuel cells (DFAFCs) have gained immense importance as a source of clean energy for portable electronic devices. It outperforms other fuel cells in several key operational and safety parameters. However, slow kinetics of the formic acid oxidation at the anode remains the main obstacle in achieving a high power output in DFAFCs. Noble metal‐based electrocatalysts are effective, but are expensive and prone to CO poisoning. Recently, a substantial volume of research work have been dedicated to develop inexpensive, high activity and long lasting electrocatalysts. Herein, recent advances in the development of anode electrocatalysts for DFAFCs are presented focusing on understanding the relationship between activity and structure. This review covers the literature related to the electrocatalysts based on noble metals, non‐noble metals, metal‐oxides, synthesis route, support material, and fuel cell performance. The future prospects and bottlenecks in the field are also discussed at the end.

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Section: Fundamentals Of Fao Reactionmentioning

confidence: 99%

Section: Anode Catalysts For Formic Acid Oxidationmentioning

confidence: 99%

Section: Kineticsmentioning

confidence: 99%

Section: Bimetallic Catalystsmentioning

confidence: 99%

See 2 more Smart Citations

Recent Advances in Anode Electrocatalysts for Direct Formic Acid Fuel Cells – Part I – Fundamentals and Pd Based Catalysts

Hossain

Saleem

Alwi

et al. 2022

The Chemical Record

View full text Add to dashboard Cite

show abstract

“…The electrooxidation of formic acid occurs via a dual pathway, including a direct (dehydrogenation) or indirect (dehydration) pathway. [27,44,45] The two mechanisms were first proposed by Capon and Parson in 1973. [46][47][48] In the direct or dehydrogenation mechanism, formic acid is first adsorbed on the metal surface, forming an active intermediate and eventually produces CO 2 .…”

Section: Mechanism Of Fao Reaction Over Ptmentioning

confidence: 99%

Recent Advances in Anode Electrocatalysts for Direct Formic Acid Fuel Cell‐II‐Platinum‐Based Catalysts

Hossain

Alwi

Saleem

et al. 2022

The Chemical Record

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Platinum-based catalysts have a long history of application in formic acid oxidation (FAO). The single metal Pt is active in FAO but expensive, scarce, and rapidly deactivates. Understanding the mechanism of FAO over Pt important for the rational design of catalysts. Pt nanomaterials rapidly deactivate because of the CO poisoning of Pt active sites via the dehydration pathway. Alloying with another transition metal improves the performance of Ptbased catalysts through bifunctional, ensemble, and steric effects. Supporting Pt catalysts on a high-surface-area support material is another technique to improve their overall catalytic activity. This review summarizes recent findings on the mechanism of FAO over Pt and Pt-based alloy catalysts. It also summarizes and analyzes binary and ternary Pt-based catalysts to understand their catalytic activity and structure relationship.

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Asymmetrical Promotional Effect in the Disorder‐to‐Order Transition of Au‐Pt‐Cu Ternary Alloy Electrocatalysts

Zhao,

Hu,

et al. 2024

Adv Funct Materials

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Binary alloys of platinum (Pt) are well‐studied to address the poor poisoning resistance of Pt. Among them, the ordered alloys, also known as intermetallics, tend to show exceptional advantages in activity and durability. In contrast, the medium and high‐entropy Pt alloy systems, with three or more elements, have been reported with better performance but not fully understood, due to the complex relationship of elemental miscibility. Herein a unique asymmetric synergistic effect in the ordering process of a series of ternary alloy AuxPt1‐xCu3 (x = 0‐1) is reported. The volcano plot of ordering degree (OD) in AuxPt1‐xCu3 (x = 0‐1) shows its peak in the Au‐rich samples but gradually shifts to Au/Pt equal molar ratio with the increasing temperature. Based on formation energy calculation and molecular dynamics analysis, the unique ordering trend of ternary alloys and the shift of OD peak position are rationalized. Among the studied samples, Au0.4Pt0.6Cu3‐350 sample exhibits the highest mass activity in electrocatalytic ethanol oxidation (3.58 A·mgAu+Pt−1), 4.4 times higher than that of commercial Pt/C. This work not only explores the unique asymmetrical effect in the OD of ternary intermetallics, but also helps to understand the complex inter‐metallic relationship in the medium‐entropy and high‐entropy alloys.

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Modulating reaction pathways of formic acid oxidation for optimized electrocatalytic performance of PtAu/CoNC

Cited by 33 publications

References 54 publications

Recent Advances in Anode Electrocatalysts for Direct Formic Acid Fuel Cells – Part I – Fundamentals and Pd Based Catalysts

Recent Advances in Anode Electrocatalysts for Direct Formic Acid Fuel Cells – Part I – Fundamentals and Pd Based Catalysts

Recent Advances in Anode Electrocatalysts for Direct Formic Acid Fuel Cell‐II‐Platinum‐Based Catalysts

Asymmetrical Promotional Effect in the Disorder‐to‐Order Transition of Au‐Pt‐Cu Ternary Alloy Electrocatalysts

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