化学吸附
兴奋剂
氧气
氧还原反应
氧还原
化学
还原(数学)
材料科学
无机化学
催化作用
电化学
物理化学
光电子学
有机化学
电极
几何学
数学
作者
Shuya Xu,Tao Chen,Sijie Chen,Tianheng Du,Yunyi Zhang,Lifang Zhang,Tongfei Li,Chenglin Yan,Tao Qian
摘要
Modulating the electronic structure and O-intermediates' chemisorption behavior of Pd metallene with boosted oxygen reduction reaction (ORR) performance is critical to advance proton exchange membrane fuel cells (PEMFCs). Herein, Hf doping Pd metallene (Hf-Pd metallene) is developed for efficient ORR electrocatalysis. Multiple characterizations and theoretical simulations disclose that the Hf dopant located in the inner atomic layers of Hf-Pd metallene could modulate the electronic configuration of Pd, lower the binding energies of the Pd d-band centers toward O-related intermediates, deliver a much reduced overpotential during O* hydrogenation into OH*, and thus enhance the catalytic activity. Consequently, the Hf-Pd metallene delivers superior ORR electrocatalytic activity together with excellent stability, surpassing commercial Pt/C and various advanced Pd-based catalysts. Encouragingly, when utilized as the cathode in a PEMFC, the Hf-Pd metallene achieved the higher maximum power density (722.75 mW cm−2) as compared to Pt/C-based batteries, elucidating the practical application of Hf-Pd metallene in PEMFCs.
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