Enhanced electrochemical hydrogen oxidation reaction and suppressed hydrogen peroxide generation properties on Pt/Ir(111) bimetallic surfaces

Hayashi, Kenta; Tomimori, Takeru; Sato, Riku; Todoroki, Naoto; Wadayama, Toshimasa

doi:10.1039/d2cp05430b

Cited by 4 publications

(4 citation statements)

References 43 publications

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“…It suggests that these bimetallic surfaces could serve as anode catalysts for polymer electrolyte FCs, potentially enhancing their performance. [ 132 ] Building on this, the introduction of 3D Ni and Co@TiC nanoarrays as anodes in direct peroxide‐peroxide FCs leads to increased performance. Nanoarrays empirical performance metrics, particularly peak power densities and cell stability, underscore their potential to redefine FCs' applications.…”

Section: Materials Requirements For H2o2 Fcmentioning

confidence: 99%

Synergistic Integration of Hydrogen Peroxide Powered Valveless Micropumps and Membraneless Fuel Cells: A Comprehensive Review

Mujtaba,

Kuzin,

Chen

et al. 2024

Adv Materials Technologies

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Catalytic valveless micropumps, and membraneless fuel cells are the class of devices that utilize the decomposition of hydrogen peroxide (H2O2) into water and oxygen. Nonetheless, a significant obstacle that endures within the discipline pertains to the pragmatic open circuit potential (OCP) of hydrogen peroxide FCs (H2O2 FCs), which fails to meet the theoretical OCP. Additionally, bubble formation significantly contributes to this disparity, as it disrupts the electrolyte's uniformity and interferes with reaction dynamics. In addition, issues such as catalyst degradation and poor kinetics can impact the overall cell efficiency. The development of high‐performance H2O2‐FCs necessitates the incorporation of selective electrocatalysts with a high surface area. However, porous micro‐structures of the electrode impedes the transport of fuel and the removal of reaction byproducts, thereby hindering the attainment of technologically significant rates. To address these challenges, including bubble formation, the review highlights the potential of integrating electrokinetic and bubble‐driven micropumps. An alternative approach involves the spatiotemporal separation of fuel and oxidizer through the use of laminar flow‐based fuel cell (LFFC). The present review addresses multifaceted challenges of H2O2‐powered FCs, and proposes integration of electrokinetic and bubble‐driven micropumps, emphasizing the critical role of bubble management in improving H2O2 FC performance.

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Section: Materials Requirements For H2o2 Fcmentioning

confidence: 99%

Synergistic Integration of Hydrogen Peroxide Powered Valveless Micropumps and Membraneless Fuel Cells: A Comprehensive Review

Mujtaba,

Kuzin,

Chen

et al. 2024

Adv Materials Technologies

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show abstract

“…The WO x /Pt(111) surface preparation and characterization were conducted in a vacuum system comprising two ultrahigh vacuum (UHV) chambers (³10 ¹8 Pa) evacuated using ion pumps and one load-lock chamber (³10 ¹6 Pa) evacuated using turbo molecular pumps. 21,22) The first UHV chamber was equipped with an X-ray photoelectron spectroscopy (XPS) system, an ion gun (OMI-0735ND-S, OMEGATRON), and a direct current (DC) power supply for the UHV annealing of the samples (PAN110-3A, KIKUSUI ELECTRONICS). The second UHV chamber had a scanning tunneling microscopy (STM) system.…”

Section: Sample Preparation and Surface Characterization 211 Vacuum S...mentioning

confidence: 99%

“…The details of the evaluations of the anode properties of the samples by SECM have been previously described. 22,27,28) The HV402-E (HOKUTO DENKO) SECM system was used. An Ag/AgCl electrode (saturated KCl, HOKUTO DENKO) and a Pt wire (0.05 mm diameter) electrode were used as the RE and CE of the SECM, respectively.…”

Section: Scanning Electrochemical Microscopymentioning

confidence: 99%

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Suppressed Hydrogen Peroxide Generation and Enhanced Electrochemical Hydrogen Oxidation Activity for Tungsten-Oxide-Modified Platinum Surface Model Catalyst System

Hayashi,

Kamikawa,

Todoroki

et al. 2023

Mater. Trans.

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Suppressed hydrogen peroxide (H 2 O 2 ) generation and practical H 2 oxidation reaction (HOR) activity of the anode catalyst surface is crucial to improve proton exchange membrane fuel cells (PEMFCs) performance. Here, the influence of surface modification on H 2 O 2 generation and HOR activity by introducing tungsten suboxides (WO x ) was investigated for platinum catalyst surfaces. A Pt(111) single-crystal substrate surface was used as the model of Pt-nanoparticle anode catalyst surface and modified with WO x through the reactive arc plasma deposition (APD) of W under an O 2 partial pressure ( p(O 2 ) = 1 © 10 ¹1 or 10 ¹3 Pa). The oxidation states of WO x were estimated by X-ray photoelectron spectroscopy, and the resulting electrocatalytic properties of H 2 O 2 generation and HOR activity were investigated using a scanning electrochemical microscope. The as-prepared oxidation states of WO x were modified depending on p(O 2 ) during the APD. Contrarily, potential cycle (PC) loadings resulted in a similar oxidation state of WO x : substoichiometric oxides containing W 4+ or W 5+ , irrespective of the as-prepared oxidation states of the deposited tungsten. Regardless of the WO x oxidation state, the WO x /Pt(111) surfaces exhibited suppressed H 2 O 2 generation, even accompanied by enhanced HOR activity compared with the clean Pt(111). Therefore, the WO x surface modification can improve the properties of Pt-based anode catalysts and contribute to high-performance catalyst developments.

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Pt-surface stabilization by high-entropy alloys for enhancing oxygen reduction reaction property: Single-crystal model catalyst study

Chida,

Tomimori,

Todoroki

et al. 2024

Electrochemistry Communications

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Enhanced electrochemical hydrogen oxidation reaction and suppressed hydrogen peroxide generation properties on Pt/Ir(111) bimetallic surfaces

Abstract: Simultaneous accomplishment of high hydrogen oxidation reaction (HOR) activity and suppressed hydrogen peroxide (H2O2) generation is desired for anode catalysts of polymer electrolyte fuel cells. 0.3 monolayer-thick-Pt-deposited Ir(111) showed threefold...

Cited by 4 publications

References 43 publications

Synergistic Integration of Hydrogen Peroxide Powered Valveless Micropumps and Membraneless Fuel Cells: A Comprehensive Review

Synergistic Integration of Hydrogen Peroxide Powered Valveless Micropumps and Membraneless Fuel Cells: A Comprehensive Review

Suppressed Hydrogen Peroxide Generation and Enhanced Electrochemical Hydrogen Oxidation Activity for Tungsten-Oxide-Modified Platinum Surface Model Catalyst System

Pt-surface stabilization by high-entropy alloys for enhancing oxygen reduction reaction property: Single-crystal model catalyst study

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