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Locking interstitial hydrogen atoms in Pd metallenes for efficient oxygen reduction reaction
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Locking interstitial hydrogen atoms in Pd metallenes for efficient oxygen reduction reaction
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Journal Article
Locking interstitial hydrogen atoms in Pd metallenes for efficient oxygen reduction reaction
2025
Overview
Palladium hydride (PdH
x
) metallenes are efficient electrocatalysts for the oxygen reduction reaction (ORR) due to their high atomic utilization and optimized oxygen binding energies modulated by interstitial hydrogen. However, their practical application is restricted by the highly unstable nature of interstitial hydrogen at working temperatures around 353 K. Here, we report that the use of Mn effectively locks hydrogen atoms within the Pd metallenes lattice, resulting in high alkaline ORR performance across a temperature range of 303–353 K. In contrast, the ORR activity of PdH
x
metallenes declines sharply with increasing temperature. At 353 K, the mass activity of PdMnH
x
metallenes at 0.95 V reaches 1.41 A mg
−
1
, which is 14.1 times higher than that of PdH
x
metallenes. Multiple spectroscopic analyses and theoretical calculations reveal that strong electronic interactions within the immiscible Pd-Mn alloy are critical for locking interstitial hydrogen, thereby enhancing the ORR activity under high temperatures.
The authors present a Mn incorporation strategy to enhance the stability of PdH
x
metallenes by locking interstitial H atoms via strong electronic interactions in the immiscible alloy, resulting in an improved alkaline oxygen reduction reaction activity and stability at working temperature around 353 K.
