Nanoporous Al-Ni-Co-Ir-Mo High-Entropy Alloy for Record-High Water Splitting Activity in Acidic Environments
Nanoporous Al-Ni-Co-Ir-Mo High-Entropy Alloy for Record-High Water Splitting Activity in Acidic Environments
复制标题
纳米多孔 Al-Ni-Co-Ir-Mo 高熵合金在酸性环境中具有创纪录的高水分解活性
DOI：
10.1002/smll.201904180
复制
发表时间：
2019-10-09
期刊：
影响因子：
13.3
通讯作者：
Qiu, Hua-Jun
中科院分区：
文献类型：
--
作者：
Jin, Zeyu;Lv, Juan;Qiu, Hua-Jun
铱基二元和三元合金是酸性溶液中电化学析氧反应（OER）的有效催化剂。然而，将Ir含量降低到小于50原子%，同时保持或甚至增强总体电催化活性和耐久性仍然是一个巨大的挑战。在本文中，通过使预先设计的Al基前体合金脱合金化，可以可控地将Ir与另外四种金属元素结合到仅具有约20原子% Ir的单个纳米结构化相中。纳米多孔高熵合金（np-HEAs）由于无限的元素组合，为调节合金的电子性质和最大化催化活性提供了无限可能。特别地，对于五元AlNiCoIrMo np-HEA，发现了创纪录的高OER活性。形成HEAs还大大增强了结构和催化耐久性，而与合金组成无关。这些np-HEA催化剂具有低Ir负载量和高活性的优点，非常有前途，适合于活性定制/最大化。
Ir-based binary and ternary alloys are effective catalysts for the electrochemical oxygen evolution reaction (OER) in acidic solutions. Nevertheless, decreasing the Ir content to less than 50 at% while maintaining or even enhancing the overall electrocatalytic activity and durability remains a grand challenge. Herein, by dealloying predesigned Al-based precursor alloys, it is possible to controllably incorporate Ir with another four metal elements into one single nanostructured phase with merely approximate to 20 at% Ir. The obtained nanoporous quinary alloys, i.e., nanoporous high-entropy alloys (np-HEAs) provide infinite possibilities for tuning alloy's electronic properties and maximizing catalytic activities owing to the endless element combinations. Particularly, a record-high OER activity is found for a quinary AlNiCoIrMo np-HEA. Forming HEAs also greatly enhances the structural and catalytic durability regardless of the alloy compositions. With the advantages of low Ir loading and high activity, these np-HEA catalysts are very promising and suitable for activity tailoring/maximization.