Chen Qian, Yang Dandan, Wang Yi, Long Yan, Fan Guangyin
College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610068, P. R. China.
ChemSusChem. 2021 Sep 20;14(18):3959-3966. doi: 10.1002/cssc.202101316. Epub 2021 Aug 19.
Developing low-cost but efficient electrocatalysts to promote the sluggish kinetics of oxygen evolution from water splitting is essential for hydrogen production. In this study, a hierarchical hollow hydrangea-like CoRu/Co superstructure is constructed through a self-templating method by morphology-controlled pyrolysis of flower-like Ru-doped Co-based layered double hydroxides (LDH). The anchoring of Ru into Co-LDH is the key to the formation of well-defined hydrangea-like three-dimensional superstructure composed of CoRu/Co. The optimized CoRu/Co-M-350 with a low Ru loading of 3.0 wt% exhibits excellent catalytic performances in the oxygen evolution reaction (OER) with low overpotential (η =192 mV) and excellent stability for 100 h at 100 mA cm in alkaline media, outperforming the benchmark RuO and most reported electrocatalysts. The superior morphology and structural features of CoRu/Co-M-350 provide not only abundant accessible surface sites but also fast mass and electron transfer, thereby promoting OER catalysis. The present study provides a new synthetic route for preparing highly active OER electrocatalysts.
开发低成本但高效的电催化剂以促进水分解析氧反应缓慢的动力学过程对于制氢至关重要。在本研究中，通过对花状Ru掺杂的Co基层状双氢氧化物（LDH）进行形貌控制热解的自模板法，构建了一种分级空心绣球花状CoRu/Co超结构。Ru锚定到Co-LDH中是形成由CoRu/Co组成的结构明确的绣球花状三维超结构的关键。优化后的CoRu/Co-M-350具有3.0 wt%的低Ru负载量，在析氧反应（OER）中表现出优异的催化性能，过电位低（η =192 mV），在碱性介质中于100 mA cm下100 h具有优异的稳定性，优于基准RuO₂和大多数已报道的电催化剂。CoRu/Co-M-350优越的形貌和结构特征不仅提供了丰富的可及表面位点，还实现了快速的质量和电子转移，从而促进了OER催化。本研究为制备高活性OER电催化剂提供了一条新的合成路线。
