“…This ultra-high cycling stability and remarkable reversibility of Ce(COOH) 3 were first discovered in this work. In fact, as summarized in Table 1, the cycling stability and capacitance retention rate of Ce(COOH) 3 are the highest among the reported Ce-organic compounds to the best of our knowledge [18,21,36,[38][39][40][41][42]. Moreover, the cycling stability and capacitance retention rate of Ce(COOH) 3 also have substantial advantages among the other most reported metal-organic compounds known for their long cycle life, such as Ni 3 (HITP) 2 (90% after 10,000 cycles at 2 A g −1 ) [16], Co-MOF (96% after 10,000 cycles at 5 mA cm −2 ) [43], Ni/Co-MOF (89.8% after 12,000 cycles at 10 A g −1 ) [44], Cu 3 (HHTP) 2 (79.9% after 5000 cycles at 5 A g −1 ) [45], V-MOF (92.1% after 10,000 cycles at 1 A g −1 ) [46], Cr-MOF (85% after 10,000 cycles at 0.5 A g −1 ) [47], Mn-MOF (81.18% after 10,000 cycles at 10 A g −1 ) [48], and Fe-MOF (74.4% after 10,000 cycles at 1 A g −1 ) [49].…”