Polyoxometalates (POM) have been deposited onto carbon nanotube (CNT) electrodes using benchtop ion soft landing (SL) enabled by a vortex-confined electrohydrodynamic desolvation process. The device is based on the dry ion localization and locomotion (DRILL) mass spectrometry interface of Fedorov and co-workers. By adding electrospray emitters, heating the desolvation gas, and operating at high gas flow rates, it is possible to obtain stable ion currents up to -15 nA that are ideal for deposition. Coupled with ambient ion optics, this interface enables desolvated ions to be delivered to surfaces while excluding solvent and counterions. Electron microscopy of surfaces prepared using the device reveal discrete POM and no aggregation that degrades electrode performance. Characterization of POM-coated CNT electrodes in a supercapacitor showed an energy storage capacity similar to that achieved with SL in vacuum. For solutions that produce primarily a single ion by electrospray ionization, benchtop SL offers a simpler and less costly approach for surface modification with applications in catalysis, energy storage, and beyond.

中文翻译：

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DRILL 接口使离子软着陆能够广泛应用于能源科学和应用。


使用台式离子软着陆 (SL)，通过涡流限制电流体动力学去溶剂化过程，将多金属氧酸盐 (POM) 沉积到碳纳米管 (CNT) 电极上。该设备基于 Fedorov 及其同事的干离子定位和运动 (DRILL) 质谱接口。通过添加电喷雾发射器、加热去溶剂化气体并在高气体流速下操作，可以获得高达 -15 nA 的稳定离子电流，这是沉积的理想选择。与环境离子光学器件相结合，该接口能够将去溶剂化离子输送到表面，同时排除溶剂和反离子。使用该设备制备的表面的电子显微镜显示，POM 是离散的，并且没有会降低电极性能的聚集。超级电容器中 POM 涂覆的 CNT 电极的表征显示出与真空中 SL 所实现的能量存储容量相似的能量存储容量。对于主要通过电喷雾电离产生单离子的解决方案，台式 SL 提供了一种更简单且成本更低的表面改性方法，可应用于催化、能量存储等领域。