Developing a high-performance ORR(oxygen reduction reaction)catalyst at low cost has been a challenge for the commercialization of high-energy density and low production cost aluminium-air batteries.Herein,we report a...Developing a high-performance ORR(oxygen reduction reaction)catalyst at low cost has been a challenge for the commercialization of high-energy density and low production cost aluminium-air batteries.Herein,we report a catalyst,prepared by pyrolyzing the shell waste of peanut or pistachio,followed by concurrent nitrogen-doping and FeCo alloy nanoparticle loading.Large surface area(1246.4m2 g-1)of pistachio shell-derived carbon can be obtained by combining physical and chemical treatments of the biomass.Such a large surface area carbon eases nitrogen doping and provides more nucleation sites for FeCo alloy growth,furnishing the resultant catalyst(FeCo/N-C-Pistachio)with higher content of N,Fe,and Co with a larger electrochemically active surface area as compared to its peanut shell counterpart(FeCo/N-C-Peanut).The FeCo/N-CPistachio displays a promising onset potential of 0.93V vs.RHE and a high saturating current density of 4.49mAcm-2,suggesting its high ORR activity.An aluminium-air battery,with FeCo/N-C-Pistachio catalyst on the cathode and coupled with a commercial aluminium 1100 anode,delivers a power density of 99.7mWcm-2 and a stable discharge voltage at 1.37V over 5 h of operation.This high-performance,low-cost,and environmentally sustainable electrocatalyst shows potential for large-scale adoption of aluminium-air batteries.展开更多
文摘Developing a high-performance ORR(oxygen reduction reaction)catalyst at low cost has been a challenge for the commercialization of high-energy density and low production cost aluminium-air batteries.Herein,we report a catalyst,prepared by pyrolyzing the shell waste of peanut or pistachio,followed by concurrent nitrogen-doping and FeCo alloy nanoparticle loading.Large surface area(1246.4m2 g-1)of pistachio shell-derived carbon can be obtained by combining physical and chemical treatments of the biomass.Such a large surface area carbon eases nitrogen doping and provides more nucleation sites for FeCo alloy growth,furnishing the resultant catalyst(FeCo/N-C-Pistachio)with higher content of N,Fe,and Co with a larger electrochemically active surface area as compared to its peanut shell counterpart(FeCo/N-C-Peanut).The FeCo/N-CPistachio displays a promising onset potential of 0.93V vs.RHE and a high saturating current density of 4.49mAcm-2,suggesting its high ORR activity.An aluminium-air battery,with FeCo/N-C-Pistachio catalyst on the cathode and coupled with a commercial aluminium 1100 anode,delivers a power density of 99.7mWcm-2 and a stable discharge voltage at 1.37V over 5 h of operation.This high-performance,low-cost,and environmentally sustainable electrocatalyst shows potential for large-scale adoption of aluminium-air batteries.
