Di Shen, Fanfei Sun, Zhijian Liang, Bingbao Mei, Ying Xie, Yucheng Wang, Lei Wang, Honggang Fu
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引用次数: 0
摘要
降低阳极氢氧化反应（HOR）中的Pt负荷，同时提高质量活性和CO耐受性是推进质子交换膜燃料电池（pemfc）发展的必要条件。在这里，1.7 wt%的铂簇负载在空心碗状w30 /WC异质结构上的电催化剂被设计用来增加抗co中毒的HOR。由于其独特的电子离域效应，w30 /WC异质结构充当了与Pt共享电子的仓库；这同时降低了HOR屏障和积累羟基自由基（•OH），以加速CO氧化。由w30的氧溢出效应产生的Pt-O键促进氢和CO氧化，而w30中消耗的晶格- o通过水解离补充。所得电催化剂在50 mV时的质量活性为469 A g-1，即使在2000 ppm CO下也具有抗毒性。PEMEC的峰值功率密度为1.63 W cm-2，并保持相当高的抗CO中毒性能。
Oxygen spillover on supported Pt-cluster for anti-CO-poisoning hydrogen oxidation
Reducing Pt loading in the anodic hydrogen oxidation reaction (HOR) and concurrently increasing mass activity and CO tolerance are essential for advancing proton exchange membrane fuel cells (PEMFCs). Here, an electrocatalyst of 1.7 wt% Pt clusters loaded on a hollow bowl-like W3O/WC heterostructure is designed to increase the anti-CO-poisoning HOR. Due to its unique electron delocalization effect, the W3O/WC heterostructure serves as a warehouse to share electrons with Pt; this simultaneously lowers the HOR barrier and accumulates the hydroxyl radicals (•OH) to accelerate CO oxidation. The Pt‒O bond originating from the oxygen spillover effect of W3O promotes hydrogen and CO oxidation, whereas the lattice‒O consumed in W3O replenished through water dissociation. The resultant electrocatalyst exhibits mass activity of 469 A g‒1 at 50 mV and anti-toxicity even at 2000 ppm CO. The PEMEC delivers a peak power density of 1.63 W cm‒2 and maintains considerable anti-CO poisoning performance.
期刊介绍：
Nature Communications, an open-access journal, publishes high-quality research spanning all areas of the natural sciences. Papers featured in the journal showcase significant advances relevant to specialists in each respective field. With a 2-year impact factor of 16.6 (2022) and a median time of 8 days from submission to the first editorial decision, Nature Communications is committed to rapid dissemination of research findings. As a multidisciplinary journal, it welcomes contributions from biological, health, physical, chemical, Earth, social, mathematical, applied, and engineering sciences, aiming to highlight important breakthroughs within each domain.
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