The highly insulated solid discharge products in sodium-oxygen (Na-O2) batteries induce large polarization and thus heavily threaten their cycle life. Controlment of discharge products taking efficient catalyst is a best way to solve this problem. Here, Mo-doped BiVO4 as the catalyst produces large amounts of carrier, thus boosting the battery reaction and reducing the overpotential under the light assistance. Compared with the BiVO4 without Mo doping, the doped one has a lower recombination of photogenerated carriers, thus benefiting a large polarization suppression and Na-O2 batteries running for over 270 cycles under 3.65 V as well as a fine rate performance. Besides, Mo doping reduces the size of BiVO4, beneficial for the carrier transportation and more reactions due to the large specific surface area. Experiment combined with theoretical calculation shows that Mo doping is advantageous to enhancing catalytic activity of BiVO4 due to a lower work function for easier electron extraction, thus enhancing Na2O2 decomposition capability. This work undoubtedly inspires photocatalysts' use for solving the insulated solid discharge products decomposition in metal-O2 batteries and provides a guide for other photocatalysts possibilities.

中文翻译：

---

掺钼 BiVO4 作为 Na-O2 电池中的快速电极反应动力学催化剂

钠氧（Na-O2）电池中高度绝缘的固体放电产物会引起大的极化，从而严重威胁其循环寿命。采用高效催化剂控制排放产物是解决这一问题的最佳途径。在此，Mo掺杂BiVO4作为催化剂产生大量载流子，从而促进电池反应并降低光辅助下的过电位。与未掺杂Mo的BiVO4相比，掺杂的BiVO4具有较低的光生载流子复合，因此有利于大的极化抑制和Na-O2电池在3.65 V下运行超过270次循环以及良好的倍率性能。此外，Mo掺杂减小了BiVO4的尺寸，由于比表面积大，有利于载流子传输和更多的反应。实验结合理论计算表明，Mo掺杂有利于增强BiVO4的催化活性，因为其功函数较低，更容易电子提取，从而增强Na2O2的分解能力。这项工作无疑启发了光催化剂用于解决金属O2电池中绝缘固体放电产物分解的问题，并为其他光催化剂的可能性提供了指导。