An organic Na-ion battery is reported with ap olyanionic 9,10anthraquinone-2,6-disulfonate (Na 2 AQ26DS, 130 mAh g À1 )c athode and the Na-intercalated state (Na 4 TP) of sodium terephthalate (Na 2 TP,2 55 mAh g À1 )a st he anode. The resulting full cells deliver the maximum discharge capacity of 131 mAh g À1 cathode in 0.5-3.2 V, simultaneously maintaining the average value of % 62 mAh g À1 cathode during 1200 cycles (0.5 Ag À1 , % 4C). These results are among the best performing organic sodium-ion full cells reportedt od ate.

Traditional method for measuring liquid level of absorption tower in wet flue gas desulfurization (WFGD) system is introduced in this paper, and it's found that measuring accuracy of the method exists in large deviation. A new method is proposed to measure liquid level of absorption tower for this situation. The local test results show that not only measurement result of new method is more close to the actual liquid level than traditional method, but also using new method can save operation cost and ensure the safety, stability, and economic operation of WFGD system.