“…With the advancing of exsolution strategies, many other exsolved products, aside from B‐site single metal nanoparticles, have been generated. These include single metals (e.g., Ag) and lanthanide oxides (e.g., PrO x ) exsolved from the A site, metal alloys (e.g., FeNi 3 and Pt 3 Ni), transition metal oxides (e.g., MnO), metal/metal oxide hybrids (e.g., Co/CoO x ) exsolved from the B site, and metal oxides/metal composites (e.g., BaO and Ni) exsolved from both the A and B sites. The parent perovskite oxides used for exsolution can be synthesized not only by conventional methods such as solid‐state reaction or sol–gel process, but also by newly developed approaches like electrospinning and template‐assisted synthesis .…”