使用嵌入碳网络的三元 NiCuFe 合金作为电极的对称直接氨燃料电池,Journal of Materials Chemistry A

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使用嵌入碳网络的三元 NiCuFe 合金作为电极的对称直接氨燃料电池
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2022-08-22 , DOI: 10.1039/d2ta04129d
Mengfei Zhang ₁ , Jie Zhang ₂ , Georgina Jeerh ₁ , Peimiao Zou ₁ , Boyao Sun ₁ , Marc Walker ₃ , Kui Xie ₂ , Shanwen Tao _{1,

4}

Affiliation

近年来，由于氨的高能量密度、低源到罐能源成本和无碳燃料，低温直接氨燃料电池（DAFC）受到广泛关注，并在氨经济中发挥重要作用。在 DAFC 中，Pt 基材料是过去十年中用于阳极氨氧化反应 (AOR) 和阴极氧还原反应 (ORR) 研究最多的电催化剂。然而，贵金属的高成本明显抑制了DAFCs的大规模应用。在此，一种三元 Ni4Cu5Fe x ( x= 0, 0.5, 1, 3, 5) 嵌入碳网络的合金是通过简单的溶剂热方法制备的，并且对 AOR 和 ORR 均表现出优异的活性和耐久性。通过实验和计算方法分析了Ni4Cu5Fe1/C样品优异的双功能催化活性。利用该合金的双功能活性，以 Ni4Cu5Fe1/C 作为阳极和阴极，以商业阴离子交换膜 (AEM) 作为电解质组装了对称 DAFC。对称 DAFC-Ni4Cu5Fe1/C在 80 °C 时的最大电流密度为 67 mA cm ^{-2 。}据我们所知，这是关于对称 DAFC 的第一份报告。这项工作不仅报道了一种新的AOR/ORR双功能催化剂，而且朝着开发结构简单的低成本DAFC的方向发展。

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A symmetric direct ammonia fuel cell using ternary NiCuFe alloy embedded in a carbon network as electrodes

Recently, due to the high energy density of ammonia, low source-to-tank energy cost and carbon free fuel, low-temperature direct ammonia fuel cells (DAFCs) have attracted extensive attention and play an important role in ammonia economy. In DAFCs, Pt-based materials have been the most studied electrocatalysts for the anodic ammonia oxidation reaction (AOR) and cathodic oxygen reduction reaction (ORR) over the past decade. However, the high cost of precious metal has markedly inhibited the large-scale application of DAFCs. Herein, a bifunctional material of ternary Ni4Cu5Fex (x = 0, 0.5, 1, 3, 5) alloy embedded in a carbon network was prepared by a simple solvothermal approach, and showed superior activity and durability towards both AOR and ORR. The excellent bifunctional catalytic activity of the Ni4Cu5Fe1/C sample was analyzed by experimental and calculational methods. Utilizing the bifunctional activities of this alloy, a symmetric DAFC was assembled with Ni4Cu5Fe1/C as both the anode and cathode, with a commercial anion exchange membrane (AEM) as electrolyte. The symmetric DAFC-Ni4Cu5Fe1/C showed a maximum current density of 67 mA cm⁻² at 80 °C. To the best of our knowledge, this is the first report on a symmetric DAFC. This work not only reports a new AOR/ORR bifunctional catalyst, but also moves towards the development of low-cost DAFCs with simple structure.

更新日期：2022-08-22

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