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Leveraging phosphate group in Pd/PdO decorated nickel phosphate microflowers via pulsed laser for robust hydrogen production in hydrazine-assisted electrolyzer

Authors
Lee, HyeyeonTheerthagiri, JayaramanAruna Kumari, M.L.Min, AhreumMoon, Cheol JooAnbazhagan, VenkattappanBrutchey, Richard L.Choi, Myong Yong
Issue Date
Feb-2024
Publisher
Elsevier Ltd
Keywords
Hydrazine oxidation reaction; Hydrogen evolution reaction; Overall water and hydrazine splitting; Pd/PdO-nanoparticle-decorated nickel phosphate; Pulsed laser irradiation in liquids
Citation
International Journal of Hydrogen Energy, v.57, pp 176 - 186
Pages
11
Indexed
SCOPUS
Journal Title
International Journal of Hydrogen Energy
Volume
57
Start Page
176
End Page
186
URI
https://scholarworks.gnu.ac.kr/handle/sw.gnu/69429
DOI
10.1016/j.ijhydene.2024.01.029
ISSN
0360-3199
1879-3487
Abstract
By driving the electrooxidation of small molecules instead of relying on sluggish oxygen evolution reaction (OER), low-input voltage is obtained for overall water splitting (OWS) and hydrogen generation, requiring active electrocatalysts. Using single-step pulsed laser irradiation, strong metal-support interaction is achieved on Pd/PdO-decorated Ni3(PO4)2·8H2O (NiPh) microflowers, yielding an outstanding bifunctional electrocatalyst for hydrogen evolution (HER) and hydrazine oxidation (HzOR). When Pd/PdO-NiPh-3 serves as both anode and cathode in the OWS electrolyzer (OER||HER), a cell voltage of 2.098 V achieves 10 mA/cm2 in 1.0 M KOH. When evaluated in the hydrazine-coupled electrolyzer (HzOR||HER), Pd/PdO-NiPh-3 exhibits remarkable stability with a low cell voltage of 0.538 V in 0.5 M-N2H4/1.0 M-KOH, which is approximately 1.56 V lower than that of the traditional water electrolyzers. In Pd/PdO-NiPh, the empty 4s and 5s orbitals of Ni2+ and Pd, respectively, serve as two absorption sites. These sites facilitate chemisorption on the electrocatalyst surface by forming a two-electron dipolar bond between the lone-pair electrons of NH2 groups in N2H4 and Ni2+ as well as Pd. A feasible strategy for utilizing Pd/PdO-NiPh catalysts in developing direct N2H4 fuel cells is investigated in this work, enabling the simultaneous production of robust energy-saving H2 fuel and electricity. © 2024 Hydrogen Energy Publications LLC
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