Facile Surface Modification of Ubiquitous Stainless Steel Led to Competent Electrocatalysts for Overall Water Splitting
Facile Surface Modification of Ubiquitous Stainless Steel Led to Competent Electrocatalysts for Overall Water Splitting
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DOI：
10.1021/acssuschemeng.7b00182
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发表时间：
2017-06-01
影响因子：
8.4
通讯作者：
Sun, Yujie
中科院分区：
文献类型：
--
作者：
Liu, Xuan;You, Bo;Sun, Yujie
高效、低成本的电催化剂对氢-2清洁生产的电催化水分解技术的广泛应用起着至关重要的作用。在此，我们首次报道了在简单的表面改性后，现成的不锈钢可以转化为H-2和O-2演化反应（分别为HER和OER）的电催化剂。具体来说，我们的硫化不锈钢箔（SSFS）在1.0 M KOH下，在HER和OER的过电位分别为136和262 mV时，可以实现10 mA cm（-2）的催化电流密度。当SSFS作为阴极和阳极的电催化剂时，在1.64 V下获得了10 mA cm'的总水分解电流密度，并且具有良好的耐久性。这种优异的性能可以与最近报道的许多由昂贵元素组成的水分解催化剂相媲美，这些催化剂含有高成本的支撑物，或者需要复杂的合成。此外，SSFS在中性介质中也取得了优异的水裂解活性，大大扩展了其工作条件。最后，我们进一步证明了类似的磷化和氮化处理也可以大大提高不锈钢的电催化性能，这表明我们的表面改性策略具有很大的通用性。
Competent and low-cost electrocatalysts play a crucial role in the wide deployment of electrocatalytic water splitting for clean H-2 production. Herein, for the first time, we report that readily available stainless steel can be transformed to competent electrocatalysts for both H-2 and O-2 evolution reactions (HER and OER, respectively) after facile surface modification. Specifically, our sulfurized stainless steel foil (SSFS) could achieve a catalytic current density of 10 mA cm(-2) at overpotentials of 136 and 262 mV for HER and OER, respectively, in 1.0 M KOH. When SSFS served as the electrocatalysts for both the cathode and the anode, an overall water splitting current density of 10 mA cm' was obtained at 1.64 V with robust durability. Such a superior performance can rival those of many recently reported water splitting catalysts that consist of expensive elements, contain high cost supports, or require sophisticated synthesis. In addition, excellent water splitting activity was also achieved by SSFS in neutral media, largely expanding its working conditions. Finally, we further demonstrated that analogous phosphorization and nitridation treatments also could substantially enhance the electrocatalytic performance of stainless steel for water splitting, suggesting the great versatility of our surface modification strategy.