Tuning crystal structure of metal nanomaterials is an effective approach to optimize electrocatalytic performance. Here, we employ amorphous FeNi alloy nanoparticles encapsulated in N doped carbon shell (A-FeNi@NC) as an efficient electrocatalyst for oxygen evolution reaction (OER) via laser irradiation in HO. The formation mechanism of amorphous FeNi alloy is due to the rapid heating and cooling rate result from the pulse laser. The following electrochemical measurements indicate that A-FeNi@NC displays much better OER activity compared with the conventional crystalline FeNi alloy nanoparticles encapsulated in N doped carbon shell (C-FeNi@NC). We proposed that amorphous FeNi alloy possess favorable electronic property to optimize electronic state of the external carbon shell and give rise to a higher electrocatalytic activity towards OER. The optimized electronic state of the external carbon shell commonly exists in other amorphous transition metal include FeCo, CoNi and Ni, give birth to a series of efficient electrocatalysts for OER.

中文翻译：

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激光照射诱导的封装在氮掺杂碳壳中的非晶态 FeNi 合金纳米颗粒具有增强的水氧化电催化活性

调整金属纳米材料的晶体结构是优化电催化性能的有效方法。在这里，我们采用封装在氮掺杂碳壳中的非晶态 FeNi 合金纳米粒子 (A-FeNi@NC) 作为一种有效的电催化剂，通过激光照射 H2O 进行析氧反应 (OER)。非晶FeNi合金的形成机理是由于脉冲激光的快速加热和冷却速率。以下电化学测量表明，与封装在氮掺杂碳壳中的传统结晶 FeNi 合金纳米颗粒 (C-FeNi@NC) 相比，A-FeNi@NC 显示出更好的 OER 活性。我们提出非晶态 FeNi 合金具有良好的电子性能，可以优化外部碳壳的电子状态，并对 OER 产生更高的电催化活性。外部碳壳的优化电子态普遍存在于其他非晶态过渡金属中，包括FeCo、CoNi和Ni，催生了一系列高效的OER电催化剂。