Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 33, Pages 39458-39469Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c10925
Keywords
wood aerogel; transition-metal doping; heteroatom doping; bifunctional electrocatalysts; Zn-air battery
Funding
- Foundation of Shandong Province, China [ZR2020QB069]
- National Natural Science Foundation of China [51703109, 51808328, 61903235]
- Major Scientific and Technological Innovation Project of Shandong [2019JZZY020309, 2019JZZY010457]
- Innovation Pilot Project of Integration of Science, Education and Industry of Shandong Province [2020KJC-ZD06, 2020KJC-ZD19]
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In this study, a convenient method was used to transform natural balsa wood into a layered porous carbon material, FeCo alloy supported on a N, S-doped wood-based carbon aerogel (FeCo@NS-CA) as the cathode in rechargeable flow zinc-air batteries (ZABs). The obtained FeCo@NS-CA with a porous lamellar architecture exhibits superior bifunctional electrocatalysis, including excellent electrochemical activities and superior stabilities, showing potential for energy-related applications.
It is necessary to correctly research and synthesize efficient and inexpensive catalysts to achieve reversible oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), which is also a prerequisite for zinc-air batteries (ZABs). However, it is still a huge challenge to manufacture electrocatalysts with durable and high electrocatalytic performance from biomass. Here, a convenient method of delignification was used to transform natural balsa wood into a layered porous carbon material, FeCo alloy supported on a N, S-doped wood-based carbon aerogel (FeCo@NS-CA) as the cathode in rechargeable flow ZAB. The obtained FeCo@NS-CA with the porous lamellar architecture exhibits superior bifunctional electrocatalysis, including excellent electrochemical activities and superior stabilities. For ORR, relative to the reversible hydrogen electrode, the onset potential of FeCo@NS-CA is 0.97 V, and the half-wave potential is 0.85 V, which is consistent with the potential of commercial Pt/C. For OER, FeCo@NS-CA obtained an overpotential of 450 mV, which is very similar to the overpotential of the benchmark RuO2. The superior performance could be owing to the alloy carrier interaction between the FeCo alloy and the wood-based carbon aerogel co-doped with N and S. Moreover, the bifunctional air cathode in a flow ZAB assembled with the FeCo@NS-CA catalyst at a current density of 10 mA cm(-2); the power density is 140 mW cm(-2), and the specific capacitance is 760 mA h g(Zn)(-1), with a remarkable long-term stability of 400 h better than ZAB of benchmark Pt/C + RuO2. This research lays the foundation for transforming abundant biomass resources into high environmental protection materials for energy-related applications.
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