One-step synthesis of hollow urchin-like Ag2Mn8O16 for long-life Li-O2 battery

Defect engineering of electrocatalysts for metal-based battery

“…Bimetallic oxides with various metal combinations of different valence states can offer synergistic catalytic activity through defect engineering [322,323]. Dai et al [324] have synthesized a hollow sea urchin-like carbonate Ag2Mn8O16 electrocatalyst. Different valences (Mn 3+ and Mn 4+ ) and oxygen vacancies provide abundant active sites and the Ag-Mn-O bond accelerates charge conversion, together enhancing catalytic capacity.…”

Optimization effect of Ag-regulated manganese oxides on electrocatalytic performance for Li–O2 batteries

“…The fabrication of urchin-like manganese oxides with various Ag + contents followed the methods reported in our previous studies. 30,51 Briefly, 0.54 g of Mn(SO 4 ) 2 •H 2 O and 0.73 g of (NH 4 ) 2 S 2 O 8 were added in 80 mL deionized water (DI) under vigorous stirring, and then concentrated H 2 SO 4 was added dropwise in the above solution to adjust the pH. Subsequently, 1.6 mL of solutions with different contents of AgNO 3 (the weight ratios are 0 wt%, 7 wt% and 126 wt% of the total mass of Mn(SO 4 ) 2 •H 2 O and (NH 4 ) 2 S 2 O 8 , respectively) were slowly added to acquire three typical manganese oxides (pure α-MnO 2 , Ag-doped MnO 2 , and silver hollandite), respectively.…”

Construction of MWNT supported ultra-small Ag@MnO2 nanoparticles for the ORR and Al–air batteries

“…16,17 Recent studies found that the modication of the MnO 2 surface by ion doping and metal oxide anchoring can effectively improve the ORR performance, the combination of Ag and MnO 2 will produce a synergistic effect, and the desorption of Ag nanoparticles on MnO 2 can improve the ORR activity and stability of MnO 2 . [18][19][20] It is well known that chemical reactions occur at the surface of catalysts, and most atoms make little contribution to the catalytic process. 21,22 Therefore, anchoring a small amount of Ag onto the MnO 2 surface for getting an effective and inexpensive ORR catalyst is expected.…”