Institute of New Catalytic Materials Science, School of Materials Science and Engineering, Nankai University, Tianjin 300350, PR China; Tianjin Collaborative Innovation Center for Chemistry & Chemical Engineering, Tianjin 300072, PR China; National Institute of Advanced Materials, Nankai University, Tianjin 300350, PR China.
Institute of New Catalytic Materials Science, School of Materials Science and Engineering, Nankai University, Tianjin 300350, PR China; Tianjin Collaborative Innovation Center for Chemistry & Chemical Engineering, Tianjin 300072, PR China; National Institute of Advanced Materials, Nankai University, Tianjin 300350, PR China.
Ultrason Sonochem. 2019 Dec;59:104714. doi: 10.1016/j.ultsonch.2019.104714. Epub 2019 Aug 1.
Metal-organic frameworks (MOFs) and their derivatives are excellent candidates for electrocatalysts profiting from their unique structures and accessible active sites. Generally, due to the weak poor conductivity and catalytic activity when used as OER electrocatalysts, MOFs are more likely to be used as precursors to obtain composite catalysts through further pyrolysis treatment, rather than directly applied as OER electrocatalysts. But heat treatment usually results in structural collapse and loss of active sites. Specially, as a kind of two-dimensional (2D) materials with rapid electron transfer, metal-organic framework nanosheets (MONs) have great application potential in various fields, especially in the field of catalysis, due to the advantages of both MOFs and 2D materials. Here, we have reported a simple top-down approach to synthesize Co-MONs which can be directly adopted as efficient OER catalysts. Ultrasonic bath (40 KHz, 100 W) was employed to control the exposing of the preponderant lattice plane, which can offer plentiful active catalytic sites and accelerate ions transport. The optimized Co-MONs attain 10 mA cm at an overpotential of 309 mV with a small Tafel slope of 75.71 mV dec.
金属-有机骨架（MOFs）及其衍生物是电催化剂的优秀候选者，它们具有独特的结构和可及的活性位点。通常情况下，由于作为 OER 电催化剂时导电性和催化活性较弱，MOFs 更有可能作为前体通过进一步的热解处理来获得复合催化剂，而不是直接作为 OER 电催化剂应用。但是，热处理通常会导致结构坍塌和活性位点的损失。特别地，作为一种具有快速电子转移的二维（2D）材料，金属-有机骨架纳米片（MONs）由于兼具 MOFs 和 2D 材料的优势，在各个领域，特别是催化领域，具有巨大的应用潜力。在这里，我们报道了一种简单的自上而下的方法来合成 Co-MONs，它可以直接用作高效的 OER 催化剂。超声浴（40 KHz，100 W）用于控制主导晶格平面的暴露，这可以提供丰富的活性催化位点并加速离子传输。优化后的 Co-MONs 在 309 mV 的过电势下达到 10 mA cm 的电流密度，具有 75.71 mV dec 的小塔菲尔斜率。
