Yu Areum, Kim Myung Hwa, Lee Chongmok, Lee Youngmi
Department of Chemistry & Nanoscience, Ewha Womans University, Seoul 03760, Korea.
Nanoscale. 2021 Aug 28;13(32):13776-13785. doi: 10.1039/d1nr02244j. Epub 2021 Aug 4.
A variety of binary Ru-Co mixed oxide nanotubes (RuCoO with x = 0.19, 0.33, 0.47, 0.64 and 0.77) were readily synthesized via electrospinning and subsequent calcination. RuCoO nanotubes (0 < x < 0.77) were composed of both rutile (Ru in RuO is replaced with Co) and spinel (Co in CoO is replaced with Ru) structures. This elemental substitution created oxygen vacancies in the rutile structure and also resulted in the incorporation of Ru in the octahedral sites of the spinel structure. The as-prepared RuCoO nanotubes were investigated for oxygen evolution reaction (OER) electrocatalytic activity in 1.0 M HClO aqueous solution. RuCoO nanotubes with x≥ 0.47 presented an excellent OER activity comparable to pure RuO, known to be the best OER catalyst. Even after more than half of the noble/active Ru content was replaced with cheap/less-active Co, RuCoO showed a good OER activity and a greatly improved stability compared to RuO under the continuous OER. These attractive catalytic properties of RuCoO can be attributed to the relatively large surface area of the tubular morphology and the substituted structures, presenting feasibility as a practical and economical OER catalyst.
通过静电纺丝和随后的煅烧，很容易合成了多种二元Ru-Co混合氧化物纳米管（x = 0.19、0.33、0.47、0.64和0.77的RuCoO）。RuCoO纳米管（0 < x < 0.77）由金红石结构（RuO中的Ru被Co取代）和尖晶石结构（CoO中的Co被Ru取代）组成。这种元素取代在金红石结构中产生了氧空位，并且还导致Ru掺入尖晶石结构的八面体位置。研究了所制备的RuCoO纳米管在1.0 M HClO水溶液中的析氧反应（OER）电催化活性。x≥0.47的RuCoO纳米管表现出与纯RuO相当的优异OER活性，纯RuO是已知的最佳OER催化剂。即使超过一半的贵金属/活性Ru含量被廉价/活性较低的Co取代，在连续OER条件下，RuCoO与RuO相比仍表现出良好的OER活性和大大提高的稳定性。RuCoO这些吸引人的催化性能可归因于管状形态和取代结构的相对较大表面积，这表明其作为实用且经济的OER催化剂具有可行性。
