Used as a selective agent in microbiology, particularly in tellurite media to isolate Corynebacterium diphtheriae (causative agent of diphtheria), as well as fungi and certain bacteria like dermatophytes and Cryptococcus species. Inhibits the growth of many bacteria and molds, allowing targeted cultivation and identification.

Employed in electroplating baths to improve coating quality and stability.

Serves as a precursor in the synthesis of semiconductor materials and tellurium-based nanomaterials, such as nanocrystals, for applications in electronics and photovoltaics.

Used in cell biology research to study oxidative stress due to its pro-oxidant properties, which generate free radicals, facilitating investigations into cell death mechanisms and antioxidant defenses.