Enhanced alkaline water splitting on cobalt phosphide sites by 4d metal (Rh)-doping method

Perumal, Sakthivel; Seo, Junhyeok

doi:10.1016/j.ijhydene.2023.03.085

Cited by 3 publications

(1 citation statement)

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“…The wide acceptance of the Tafel slopes of 120, 40, and 30 mV/dec for the Volmer, Heyrovsky, and Tafel determining rate steps, respectively, serves as validation for our kinetic model [39]. The Tafel slope values of the prepared catalysts, ranging from 75 to 90 mV/dec, further confirm their adherence to the Volmer-Heyrovsky reaction pathway [40,41]. The highest power density of the fuel cell using CoP was 32.375 mW cm −2 , which was higher than those of Co(OH)F (23.625 mW cm −2 ) and Co 3 O 4 (20.125 mW cm −2 ), as shown in Figure S4a.…”

Section: Resultssupporting

confidence: 53%

Precious Metal-Free CoP Nanorod Electrocatalyst as an Effective Bifunctional Oxygen Electrode for Anion Exchange Membrane-Unitized Regenerative Fuel Cells

et al. 2023

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In this study, noble metal-free Co(OH)F and CoP nanorod electrocatalysts were prepared and explored as bifunctional oxygen electrodes (BOE) in anion exchange membrane-unitized regenerative fuel cells (AEM-URFCs). A CoP nanorod was synthesized from Co(OH)F via the hydrothermal treatment of cobalt nitrate, ammonium fluoride, and urea, followed by phosphorization. The crystal structures, surface morphologies, pore distributions, and elemental statuses of the obtained catalysts were analyzed to identify the changes caused by the incorporation of fluorine and phosphorus. The presence of F and P was confirmed through EDS and XPS analyses, respectively. Using these catalysts, the AEM-based URFCs were operated with hydrogen and oxygen in the fuel cell mode and pure water in the electrolysis mode. In addition, the electrocatalytic activities of the catalysts were evaluated using cyclic voltammetry and electrochemical impedance spectroscopy. In the AEM-URFC test, the CoP catalyst in the BOE delivered the best performance in the fuel cell mode (105 mA cm−2 at 0.3 V), and Co(OH)F was suitable for the water electrolyzer mode (30 mA cm−2 at 2.0 V). CoP and Co(OH)F exhibited higher round trip efficiency (RTE) and power densities than the conventional Co3O4 catalyst.

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Section: Resultssupporting

confidence: 53%

Precious Metal-Free CoP Nanorod Electrocatalyst as an Effective Bifunctional Oxygen Electrode for Anion Exchange Membrane-Unitized Regenerative Fuel Cells

et al. 2023

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Dual‐Functional Ru/Ni‐B‐P Electrocatalyst Toward Accelerated Water Electrolysis and High‐Stability

Habib,

Burse,

Lin

et al. 2023

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Development of advanced electrocatalysts for the green hydrogen production by water electrolysis is an important task to reduce the climate and environmental issues as well as to meet the future energy demands. Herein, Ru/Ni‐B‐P sphere electrocatalyst is demonstrated by a combination of hydrothermal and soaking approaches, meeting the industrial requirement of low cell voltage with stable high‐current operation. The Ru/Ni‐B‐P sphere catalyst demonstrates low overpotentials of 191 and 350 mV at 300 mA cm−2 with stable high current operation, ranking it as one of the best oxygen evolution reaction (OER) electrocatalysts. The bifunctional 2‐E system demonstrates a low cell voltage of 2.49 V at 2000 mA cm−2 in 6 m KOH at 60 °C of harsh industrial operation condition. It also demonstrates outstanding stability with continuous 120 h (5 days) CA operation at 1000 mA cm−2. Further, the hybrid configuration of Ru/Ni‐B‐P || Pt/C being paired with the conventional benchmark electrode demonstrates a record low 2‐E cell voltage of 2.40 V at 2000 mA cm−2 in 6 m KOH and excellent stability at high current of 1500 mA cm−2 under industrial operational condition.

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An ultra-high electrochemical performance of surface-rich boron induced multi-metal centered heterocatalyst for overall water splitting

Babu

Sakthivel

Mohammed

et al. 2024

International Journal of Hydrogen Energy

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Enhanced alkaline water splitting on cobalt phosphide sites by 4d metal (Rh)-doping method

Cited by 3 publications

References 57 publications

Precious Metal-Free CoP Nanorod Electrocatalyst as an Effective Bifunctional Oxygen Electrode for Anion Exchange Membrane-Unitized Regenerative Fuel Cells

Precious Metal-Free CoP Nanorod Electrocatalyst as an Effective Bifunctional Oxygen Electrode for Anion Exchange Membrane-Unitized Regenerative Fuel Cells

Dual‐Functional Ru/Ni‐B‐P Electrocatalyst Toward Accelerated Water Electrolysis and High‐Stability

An ultra-high electrochemical performance of surface-rich boron induced multi-metal centered heterocatalyst for overall water splitting

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