Yuan, Yi, Wu, Xue-Qian, Yin, Xi, Ruan, Heng-Yu, Wu, Ya-Pan, Li, Shuang, Hai, Guangtong, Zhang, Gaixia, Sun, Shuhui et Li, Dong-Sheng.
2024.
« Dilute Pd-Ni alloy through low-temperature pyrolysis for enhanced electrocatalytic hydrogen oxidation ».
Angewandte Chemie - International Edition.
Compte des citations dans Scopus : 1.
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Résumé
Designing highly active and cost-effective electrocatalysts for the alkaline hydrogen oxidation reaction (HOR) is critical for advancing anion-exchange membrane fuel cells (AEMFCs). While dilute metal alloys have demonstrated substantial potential in enhancing alkaline HOR performance, there has been limited exploration in terms of rational design, controllable synthesis, and mechanism study. Herein, we developed a series of dilute Pd-Ni alloys, denoted as x % Pd-Ni, based on a trace-Pd decorated Ni-based coordination polymer through a facile low-temperature pyrolysis approach. The x% Pd-Ni alloys exhibit efficient electrocatalytic activity for HOR in alkaline media. Notably, the optimal 0.5% Pd-Ni catalyst demonstrates high intrinsic activity with an exchange current density of 0.055 mAcm-2, surpassing that of many other alkaline HOR catalysts. The mechanism study reveals that the strong synergy between Pd single atoms (SAs)/Pd dimer and Ni substrate can modulate the binding strength of proton (H)/hydroxyl (OH), thereby significantly reducing the activation energy barrier of a decisive reaction step. This work offers new insights into designing advanced dilute metal or single-atom-alloys (SAAs) for alkaline HOR and potentially other energy conversion processes.
| Type de document: | Article publié dans une revue, révisé par les pairs |
|---|---|
| Professeur: | Professeur Zhang, Gaixia |
| Affiliation: | Génie électrique |
| Date de dépôt: | 12 nov. 2024 16:45 |
| Dernière modification: | 22 nov. 2024 15:26 |
| URI: | https://espace2.etsmtl.ca/id/eprint/29811 |
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