Modern cathodes used in such devices are based on thermionic emission, which requires high temperatures and is accompanied by significant energy loss. Scientists propose to use field emission, which does not require heating and has higher efficiency.
A new material based on carbon nanomaterials and barium oxide has made significant progress: its emission properties increased fourfold compared to conventional tungsten-based cathodes. The maximum emitted current was more than 500 μA, indicating high potential applicability of the new cathodes in various types of equipment.
Source: Ferra
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