Huang Weixia, Tong Yun, Feng Dongmei, Chen Pengzuo
Department of Chemistry, Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, Zhejiang Sci-Tech University, Hangzhou 310018, China.
Department of Chemistry, Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, Zhejiang Sci-Tech University, Hangzhou 310018, China.
J Colloid Interface Sci. 2023 Jan;629(Pt A):144-154. doi: 10.1016/j.jcis.2022.08.149. Epub 2022 Aug 28.
Low-dimensional cobalt-based materials have proved to be one of the promising catalytic systems for oxygen-evolution reaction (OER). How to develop a facile and universal strategy for significantly improving their catalytic performance is of great significance, but still faces great challenges. Herein, a series of cobalt-based nanowires (CoS, CoP, CoF and CoO) are synthesized and used as conceptual examples to explore the universality to enhance their OER catalytic activity. The FeOOH-modified cobalt-based electrocatalysts exhibit significantly improved OER catalytic performance compared to the pristine samples. Especially, the optimal CoS@FeOOH material delivers the smallest overpotential of 260 mV at 100 mA cm, which outperforms most of the reported excellent materials. Notably, the CoP||CoP@FeOOH electrolyzer (1.63 V@30 mA cm) delivers higher performance than the CoS||CoS@FeOOH electrolyzer (1.72 V@30 mA cm) benefiting from the better HER catalytic activity of CoP. In addition, the post-characterizations confirm that the real catalytic structure of those electrocatalysts consists of a surface CoOOH@FeOOH catalytic layer and cobalt-based nanowire core. The Co-Fe catalytic layer provides more active centers for the adsorption and dissociation of water molecules as well as the formation of oxygen, while the nanowire core acts as an electron transport channel to realize better reaction kinetics. Our work not only develops a general strategy to enhance the catalytic activity but also provides new ideas for the facile design of other advanced catalytic materials.
低维钴基材料已被证明是析氧反应（OER）中很有前景的催化体系之一。如何开发一种简便通用的策略来显著提高其催化性能具有重要意义，但仍面临巨大挑战。在此，合成了一系列钴基纳米线（CoS、CoP、CoF和CoO），并将其用作概念示例来探索提高其OER催化活性的通用性。与原始样品相比，FeOOH修饰的钴基电催化剂表现出显著提高的OER催化性能。特别是，最佳的CoS@FeOOH材料在100 mA cm时提供了最小过电位260 mV，优于大多数已报道的优异材料。值得注意的是，CoP||CoP@FeOOH电解槽（1.63 V@30 mA cm）比CoS||CoS@FeOOH电解槽（1.72 V@30 mA cm）具有更高的性能，这得益于CoP更好的析氢催化活性。此外，后续表征证实这些电催化剂的实际催化结构由表面CoOOH@FeOOH催化层和钴基纳米线核心组成。Co-Fe催化层为水分子的吸附和解离以及氧的形成提供了更多活性中心，而纳米线核心充当电子传输通道以实现更好的反应动力学。我们的工作不仅开发了一种提高催化活性的通用策略，还为其他先进催化材料的简便设计提供了新思路。
