Shi Yuxin, Li Jianing, Zhang Xu, Zhao Kai, Wang Zheng, Wang Zhao, Peng Xu
Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry-of-Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules & College of Chemistry & Chemical Engineering, Hubei University Wuhan 430062 P. R. China
Equine Science Research and Horse Doping Control Laboratory Wuhan Business University Wuhan 430056 People's Republic of China
RSC Adv. 2022 Oct 26;12(47):30605-30610. doi: 10.1039/d2ra04032h. eCollection 2022 Oct 24.
Exploring an efficient way to enhance electron/ion transport behavior of nanomaterials plays an important role in the study of energy storage & conversion. However, the evolution rules of lattice and electronic structure during the pyrolysis process of low-dimensional nanomaterials, which further regulate its electron/ion transport properties, have not been effectively elucidated. Here we study the pyrolysis process of cation intercalated MnO as a case for realizing optimized electron/ion transport behavior. In our case, thermogravimetry-mass spectrometry (TG-MS) was adopted for tracking the remaining products in pyrolysis and decomposition products, further finding out the evolution law of the manganese-oxygen polyhedron structure during the pyrolysis. Moreover, the internal relations between the crystal structure and the electronic structure during the pyrolysis process of low-dimensional manganese oxide are revealed by fine structure characterization. As expected, partially treated 2D MnO nanosheets with controlled pyrolysis displays ultrahigh UOR performance with the overpotential of 1.320 V RHE at the current density of 10 mA cm, which is the best value among non-nickel-based materials. We anticipate that studying the mechanism of the pyrolysis process has important guiding significance for the development of high electron/ion transport devices.
探索一种提高纳米材料电子/离子传输行为的有效方法在能量存储与转换研究中具有重要作用。然而，低维纳米材料热解过程中晶格和电子结构的演变规律，这进一步调节其电子/离子传输性能，尚未得到有效阐明。在此，我们以阳离子插层MnO的热解过程为例进行研究，以实现优化的电子/离子传输行为。在我们的研究中，采用热重-质谱联用（TG-MS）来追踪热解过程中的剩余产物和分解产物，进一步找出热解过程中锰氧多面体结构的演变规律。此外，通过精细结构表征揭示了低维氧化锰热解过程中晶体结构与电子结构之间的内在关系。正如预期的那样，经过可控热解处理的部分二维MnO纳米片在10 mA cm的电流密度下，过电位为1.320 V RHE时表现出超高的析氧反应（OER）性能，这是无镍基材料中的最佳值。我们预计，研究热解过程的机理对高电子/离子传输器件的开发具有重要的指导意义。
