Porous electrodes from self-assembled 3D jointed Pd polyhedra for direct formic acid fuel cells
Porous electrodes from self-assembled 3D jointed Pd polyhedra for direct formic acid fuel cells
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DOI：
10.1016/j.cej.2023.142244
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发表时间：
2023-03-07
影响因子：
15.1
通讯作者：
Du, Shangfeng
中科院分区：
文献类型：
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作者：
Li, Yang;Yan, Yichang;Du, Shangfeng
直接甲酸燃料电池（DFAFC）具有电动势高、燃料易于储存和运输等优点，被认为是一种很有前途的能源。然而，它的功率性能低，成本高，这是已知的起源于缓慢的甲酸氧化（FAO）动力学和不良的质量传输内的DFAFC阳极。在这里，我们提出了一种新的DFAFC阳极设计与薄的，多孔的，3D结构的催化剂层的基础上自组装接合Pd多面体原位生长的气体扩散层表面。Pd多面体提供了高度活性的接合界面和高折射率刻面，提高了它们对FAO的催化活性。多孔3D催化剂层促进了反应物和产物在大电流密度区域的传输。因此，本阳极设计在HCOOH/空气DFAFC测试中在1.0 mg cm-2的Pd负载下表现出先前未实现的202 mW cm-2的功率密度。
The direct formic acid fuel cell (DFAFC) is recognized as a promising power source for its high electromotive force, easy fuel storage and transport. However, its power performance is low and the cost is high, which are known to originate from the sluggish formic acid oxidation (FAO) kinetics and poor mass transport within the DFAFC anode. Here, we present a new DFAFC anode design with a thin, porous, 3D-structured catalyst layer based on self-assembled jointed Pd polyhedra in-situ grown on the gas diffusion layer surface. The Pd polyhedra provide highly active jointed interfaces and high-index facets, boosting their catalytic activity towards FAO. The porous 3D catalyst layer facilitates the transport of reactants and products at the large current density region. Consequently, the present anode design exhibits a previously unachieved power density of 202 mW cm-2 at a Pd loading of 1.0 mg cm-2 in the HCOOH/air DFAFC test.