Neaţu Ştefan, Neaţu Florentina, Diculescu Victor C, Trandafir Mihaela M, Petrea Nicoleta, Somacescu Simona, Krumeich Frank, Wennmacher Julian T C, Knorpp Amy J, van Bokhoven Jeroen A, Florea Mihaela
National Institute of Materials Physics, 405A Atomistilor Street, 077125 Magurele, Romania.
Scientific Research Centre for CBRN Defence and Ecology, 225 Oltenitei Road, 041309 Bucharest, Romania.
ACS Appl Mater Interfaces. 2020 Apr 22;12(16):18407-18420. doi: 10.1021/acsami.9b19541. Epub 2020 Apr 10.
In this study, the synergistic behavior of Ni species and bimodal mesoporous undoped SnO is investigated in oxygen evolution reactions (OERs) under alkaline conditions without any other modification of the compositional phases or using noble metals. An efficient and environmentally friendly hydrothermal method to prepare bimodal mesoporous undoped SnO with a very high surface area (>130 m g) and a general deposition-precipitation method for the synthesis of well-dispersed Ni species on undoped SnO are reported. The powders were characterized by adsorption-desorption isotherms, TG-DTA, XRD, SEM, TEM, Raman, TPR-H, and XPS. The best NiSn composite generates, under certain experimental conditions, a very high TOF value of 1.14 s and a mass activity higher than 370 A g, which are remarkable results considering the low amount of Ni deposited on the electrode (3.78 ng). Moreover, in 1 M NaOH electrolyte, this material produces more than 24 mA cm at an overpotential value of approximately +0.33 V, with only 5 wt % Ni species. This performance stems from the dual role of undoped SnO, on the one hand, as a support for active and well-dispersed Ni species and on the other hand as an active player through the oxygen vacancies generated upon Ni deposition.
在本研究中，研究了镍物种与双峰介孔未掺杂SnO在碱性条件下的析氧反应（OER）中的协同行为，且未对组成相进行任何其他改性或使用贵金属。报道了一种高效且环保的水热法制备具有非常高表面积（>130 m²/g）的双峰介孔未掺杂SnO，以及一种用于在未掺杂SnO上合成分散良好的镍物种的通用沉积沉淀法。通过吸附-脱附等温线、TG-DTA、XRD、SEM、TEM、拉曼、TPR-H和XPS对粉末进行了表征。在某些实验条件下，最佳的NiSn复合材料产生了非常高的TOF值1.14 s⁻¹和高于370 A/g的质量活性，考虑到沉积在电极上的镍含量较低（3.78 ng），这是显著的结果。此外，在1 M NaOH电解质中，这种材料在约+0.33 V的过电位值下产生超过24 mA/cm²的电流，镍物种含量仅为5 wt%。这种性能源于未掺杂SnO的双重作用，一方面作为活性且分散良好的镍物种的载体，另一方面通过镍沉积时产生的氧空位作为活性参与者。
