Magnesium ion batteries(MIBs)are a potential field for the energy storage of the future but are restricted by insufficient rate capability and rapid capacity degradation.Magnesium-sodium hybrid ion batteries(MSHBs)are...Magnesium ion batteries(MIBs)are a potential field for the energy storage of the future but are restricted by insufficient rate capability and rapid capacity degradation.Magnesium-sodium hybrid ion batteries(MSHBs)are an effective way to address these problems.Here,we report a new type of MSHBs that use layered sodium vanadate((Na,Mn)V_(8)O_(20)·5H_(2)O,Mn-NVO)cathodes coupled with an organic 3,4,9,10-perylenetetracarboxylic diimide(PTCDI)anode in Mg^(2+)/Na^(+)hybrid electrolytes.During electrochemical cycling,Mg^(2+)and Na^(+)co-participate in the cathode reactions,and the introduction of Na^(+)promotes the structural stability of the Mn-NVO cathode,as cleared by several ex-situ characterizations.Consequently,the Mn-NVO cathode presents great specific capacity(249.9 mA h g^(−1)at 300 mA g^(−1))and cycling(1500 cycles at 1500 mA g^(−1))in the Mg^(2+)/Na^(+)hybrid electrolytes.Besides,full battery displays long lifespan with 10,000 cycles at 1000 mA g^(−1).The rate performance and cycling stability of MSHBs have been improved by an economical and scalable method,and the mechanism for these improvements is discussed.展开更多
The glucose isomerase(GI) was a metal activating enzyme It was most activated by Co 2+ and Mg 2+ ,and Mg 2+ was the best activator,whether the glucose or the xylose was the substrate When the glucose was substrate,the...The glucose isomerase(GI) was a metal activating enzyme It was most activated by Co 2+ and Mg 2+ ,and Mg 2+ was the best activator,whether the glucose or the xylose was the substrate When the glucose was substrate,the dissociation constant of Mg 2+ GI,Co 2+ GI and Mn 2+ -GI was 115 μmol/L,40 μmol/L, and 15 μmol/L respectively. The maximum activity of Mg 2+ GI,Co 2- GI and Mn 2+ GI was 100%,85%,and 20% respectively. When the xylose was substrate,the order of dissociation constant and maximum activity of the metal enzymes was the same Ca 2+ was a competitive inhibitor versus Mg 2+ ( K i 7 4 μmol/L)or Co 2+ ( K i 99 μmol/L). Compared with Mg 2+ GI,the K m of Co 2+ GI was more,and the V M of Co 2+ GI less The process of activity recovery from apo GI to metal GI showed that it was slow and of two展开更多
基金the financial support from the National Natural Science Foundation of China, China (22005207, 52261160384)the Guangdong Basic and Applied Basic Research Foundation, Guangdong Province, China (2019A1515011819)+2 种基金the Outstanding Youth Basic Research Project of Shenzhen, Shenzhen, China (RCYX20221008092934093)the Joint Funds of the National Natural Science Foundation of China, China (U22A20140)the Science and Technology Development Fund, Macao SAR (0090/2021/A2 and 0049/2021/AGJ)
文摘Magnesium ion batteries(MIBs)are a potential field for the energy storage of the future but are restricted by insufficient rate capability and rapid capacity degradation.Magnesium-sodium hybrid ion batteries(MSHBs)are an effective way to address these problems.Here,we report a new type of MSHBs that use layered sodium vanadate((Na,Mn)V_(8)O_(20)·5H_(2)O,Mn-NVO)cathodes coupled with an organic 3,4,9,10-perylenetetracarboxylic diimide(PTCDI)anode in Mg^(2+)/Na^(+)hybrid electrolytes.During electrochemical cycling,Mg^(2+)and Na^(+)co-participate in the cathode reactions,and the introduction of Na^(+)promotes the structural stability of the Mn-NVO cathode,as cleared by several ex-situ characterizations.Consequently,the Mn-NVO cathode presents great specific capacity(249.9 mA h g^(−1)at 300 mA g^(−1))and cycling(1500 cycles at 1500 mA g^(−1))in the Mg^(2+)/Na^(+)hybrid electrolytes.Besides,full battery displays long lifespan with 10,000 cycles at 1000 mA g^(−1).The rate performance and cycling stability of MSHBs have been improved by an economical and scalable method,and the mechanism for these improvements is discussed.
文摘The glucose isomerase(GI) was a metal activating enzyme It was most activated by Co 2+ and Mg 2+ ,and Mg 2+ was the best activator,whether the glucose or the xylose was the substrate When the glucose was substrate,the dissociation constant of Mg 2+ GI,Co 2+ GI and Mn 2+ -GI was 115 μmol/L,40 μmol/L, and 15 μmol/L respectively. The maximum activity of Mg 2+ GI,Co 2- GI and Mn 2+ GI was 100%,85%,and 20% respectively. When the xylose was substrate,the order of dissociation constant and maximum activity of the metal enzymes was the same Ca 2+ was a competitive inhibitor versus Mg 2+ ( K i 7 4 μmol/L)or Co 2+ ( K i 99 μmol/L). Compared with Mg 2+ GI,the K m of Co 2+ GI was more,and the V M of Co 2+ GI less The process of activity recovery from apo GI to metal GI showed that it was slow and of two
