A novel IrNi@PdIr/C core–shell electrocatalyst with enhanced activity and durability for the hydrogen oxidation reaction in alkaline anion exchange membrane fuel cells†,Nanoscale

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A novel IrNi@PdIr/C core–shell electrocatalyst with enhanced activity and durability for the hydrogen oxidation reaction in alkaline anion exchange membrane fuel cells†
Nanoscale ( IF 5.8 ) Pub Date : 2018-02-23 00:00:00 , DOI: 10.1039/c7nr09452c
Bowen Qin _{1,

2,

3,

4,

5} , Hongmei Yu _{1,

2,

3,

4,

5} , Jia Jia _{1,

2,

3,

4,

5} , Chi Jun _{1,

2,

3,

4,

5} , Xueqiang Gao _{1,

2,

3,

4,

5} , Dewei Yao _{1,

2,

3,

4,

5} , Xinye Sun _{1,

2,

3,

4,

5} , Wei Song _{1,

2,

3,

4,

5} , Baolian Yi _{1,

2,

3,

4,

5} , Zhigang Shao _{1,

2,

3,

4,

5}

Affiliation

Herein, a novel non-platinum core–shell catalyst, namely, IrNi@PdIr/C was prepared via a galvanic replacement reaction; it exhibits enhanced hydrogen oxidation activity and excellent stability under alkaline conditions. Electrochemical experiments demonstrated that the mass and specific activities at 50 mV of IrNi@PdIr/C are 2.1 and 2.2 times that of commercial Pt/C in 0.1 M KOH at 298 K, respectively. Moreover, accelerated degradation tests have shown that the electrochemically active surface area (ECSA) of IrNi@PdIr/C reduces by only 5.1%, which is almost 4 times less than that of commercial Pt/C and the mass activity at 50 mV of IrNi@PdIr/C after 2000 potential cycles is still 1.8 times higher than that of aged Pt/C. XRD and XPS analysis suggest that the enhanced HOR activity is attributed to the weakening of the hydrogen binding to the PdIr overlayers induced by the IrNi core. The better stability to potential cycling can be associated with the PdIr shell, which inhibits oxide formation. These results suggest that IrNi@PdIr/C is a promising non-platinum anode catalyst for alkaline anion exchange membrane fuel cells.

中文翻译：

一种新颖的IrNi @ PdIr / C核壳电催化剂，具有增强的活性和耐用性，可用于碱性阴离子交换膜燃料电池中的氢氧化反应†

在此，通过以下方法制备了一种新型的非铂核-壳催化剂，即IrNi @ PdIr / C电流置换反应；它在碱性条件下表现出增强的氢氧化活性和出色的稳定性。电化学实验表明，在298 K的0.1 M KOH中，IrNi @ PdIr / C在50 mV的质量和比活分别是商业Pt / C的2.1和2.2倍。此外，加速降解测试表明，IrNi @ PdIr / C的电化学活性表面积（ECSA）仅降低5.1％，几乎是商用Pt / C和50 mV IrNi的质量活度的4倍。在2000个潜在周期后，@ PdIr / C仍比老化的Pt / C高1.8倍。XRD和XPS分析表明，增强的HOR活性归因于氢与IrNi核诱导的与PdIr覆盖层结合的弱化。PdIr壳可能具有更好的对潜在循环的稳定性，从而抑制了氧化物的形成。这些结果表明，IrNi @ PdIr / C是用于碱性阴离子交换膜燃料电池的有前途的非铂阳极催化剂。

更新日期：2018-02-23

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