High Electrocatalytic Activity of Silver-Doped Manganese Dioxide toward Oxygen Reduction Reaction in Aluminum-Air Battery

Abstract

The development of the efficient and economical catalysts for the oxygen reduction reaction (ORR) is an important issue for the commercialization of metal-air batteries. Herein, a silver-doped δ-MnO2 dispersed on carbon powder (Ag-MnO2/C) was synthesized by a facile route. The specific surface area of Ag-MnO2/C is more than three times higher than that of MnO2/C. Moreover, Ag-MnO2/C shows much higher catalytic activity toward ORR than MnO2/C or Ag/C. The half-wave potential of Ag-MnO2/C is much more positive compared with that of 20% Pt/C. Ag-MnO2/C also exhibits an excellent long-term stability and the ORR current retention keeps 97.1% after aging for 45000 s. Using Ag-MnO2/C as the ORR catalyst, the peak power density of Al-air battery reaches 315 mW cm−2 which is almost the highest record.

Intrinsic Structure Modification of Electrode Materials for Aqueous Metal‐Ion and Metal‐Air Batteries

“…showed that there are three characteristic diffraction peaks according to (101), (110), and (301) planes of the layer-struc- Figure 6g). Compared with other rechargeable aqueous metal-ion batteries reported previously, the V-Mn AR-PIMBs based on Au/ac-K x V 2 O 5 delivered a high rate capability (31 mAh cm −3 at 1000 mV s −1 ), outstanding volumetric capacity of ≈715 mAh cm −3 , low self-discharge (≤3.6 mV h −1 ), improved power density of ≈600 W cm −3 and energy density of ≈27 mWh cm −3 (Figure 6h-j).…”

“…[108] It also was reported that the intercalating foreign ions, such as metal ions into the layers were used to promote excellent electroactivity for ORR and OER. [109][110][111] Miao et al found the MnO 2 nanospheres intercalated by cerium ion possessed a high catalytic activity toward ORR for Al-air batteries. The birnessite-type manganese oxide (δ-MnO 2 ) with cerium ion intercalated dispersed on carbon (Ce-MnO 2 /C) was first prepared via facile aqueous reactions.…”

Opportunities of Aqueous Manganese‐Based Batteries with Deposition and Stripping Chemistry

“…[ 5–10 ] Rechargeable batteries [ 11–19 ] are regarded as the most efficient energy storage technologies that have been widely applied to portable electronics, electric vehicles and grid‐scale energy storage. Although lithium ion batteries are dominating the current market of electric vehicles and portable electronic devices, [ 20–24 ] their application in grid‐scale energy storage is just beginning due to relatively high cost, limited service life, and safety concerns. [ 25–30 ] Other existing rechargeable batteries such as sodium‐sulfur (Na‐S), lead‐acid, and redox‐flow batteries have been gradually applied to the grid storage, but they have encountered different obstacles that need to be overcome, as summarized in Figure 1 .…”

A novel experimental study on discharge characteristics of an aluminum-air battery

“…Its peak power density can reach 315 mW cm −2 . 33 Xu designed a full polymeric fibrous aluminum-air battery, and its capacity density could reach 935 Ah kg −1 and energy density could reach 1168 Wh kg −1 . 34 According to previous discussions, the current research on the aluminum-air battery mainly focused on the optimization of materials to improve energy and power densities, and to reduce the effect of the corrosion reaction.…”

“…Sun used Ag‐MnO2/C as a catalyst for redox reaction of aluminum‐air battery. Its peak power density can reach 315 mW cm −2 . Xu designed a full polymeric fibrous aluminum‐air battery, and its capacity density could reach 935 Ah kg −1 and energy density could reach 1168 Wh kg −1 …”