Journal
ACS APPLIED ENERGY MATERIALS
Volume 2, Issue 3, Pages 2296-2304Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.9b00120
Keywords
NiCo2O4; nitrogen doping; bifunctional catalyst; zinc-air battery; triboelectric nanogenerators
Funding
- National Science Foundation of China [51672029, 51372271, 51602025, 51474009]
- Ministry of Science and Technology, China [2016YFA0202702]
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The design and synthesis of efficient and cost-effective electrocatalysts are vital for rechargeable zinc-air batteries (ZABs). Here, nitrogen-doped NiCo2O4 (N-doped NiCo2O4) was prepared and used as a promising electrocatalyst for ZABs. By doping with nitrogen, the N-doped NiCo2O4 catalyst shows higher catalytic activity than that of NiCo2O4 in terms of higher half-wave potential and lower Tafel slope. As a cathode catalyst for flexible rechargeable zinc-air batteries, the cell with N-doped NiCo2O4 shows excellent cycling performance. X-ray absorption near-edge structure (XANES) results manifest that the improved catalytic performance is attributed to the enhanced covalence of Co-O and Ni-O and more active sites in N-doped NiCo2O4. Moreover, we demonstrate a self-powered system, which integrates the flexible ZABs and TENG to power a LED screen.
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