Affiliation:
1. School of Chemistry and Chemical Engineering Anhui Province Key Laboratory of Controllable Chemistry Reaction and Material Chemical Engineering Anhui Province Key Laboratory of Advanced Catalytic Materials and Reaction Engineering Hefei University of Technology Tunxi Road 193 Hefei 230009 P. R. China
2. School of Chemistry and Chemical Engineering Key Laboratory of Electrochemical Energy Storage and Energy Conversion of Hainan Province Hainan Normal University Longkunnan Road 99 Haikou 571158 P. R. China
Abstract
AbstractDevelopment of efficient and robust cathode catalysts is critical for the commercialization of Li‐O2 batteries (LOBs). Herein, a well‐designed CePO4@N‐P‐CNSs cathode catalyst for LOBs via coupling P‐N site‐rich N, P co‐doped graphene‐like carbon nanosheets (N‐P‐CNSs) with nano‐CePO4 via a novel “in situ derivation” coupling strategy by in situ transforming the P atoms of P‐C sites in N‐P‐CNSs to CePO4 is reported. The CePO4@N‐P‐CNSs exhibit superior bifunctional ORR/OER activity relative to commercial Pt/C‐RuO2 with an overall overpotential of 0.64 V (vs RHE). Moreover, the LOB with CePO4@N‐P‐CNSs as the cathode catalyst delivers a low charge overpotential of 0.67 V (vs Li/Li+), high discharge capacity of 29774 mAh g−1 at 100 mA g−1 and long cycling stability of 415 cycles, respectively. The remarkably enhanced LOB performance is attributable to the in situ derived CePO4 nanoparticles and the P‐N sites in N‐P‐CNSs, which facilitate increased bifunctional ORR/OER activity, promote the rapid and effective decomposition of Li2O2 and inhibit the formation of Li2CO3. This work may provide new inspiration for designing efficient, durable, and cost‐effective cathode catalysts for LOBs.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Anhui Province
Fundamental Research Funds for the Central Universities
Subject
Biomaterials,Biotechnology,General Materials Science,General Chemistry
Cited by
24 articles.
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