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Electrocatalytic performances of g-C3N4-LaNiO3 composite as bi-functional catalysts for lithium-oxygen batteries

机译:g-C3N4-LaNiO3复合材料作为锂氧电池双功能催化剂的电催化性能

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摘要

A low cost and non-precious metal composite material g-C3N4-LaNiO3 (CNL) was synthesized as a bifunctional electrocatalyst for the air electrode of lithium-oxygen (Li-O2) batteries. The composition strategy changed the electron structure of LaNiO3 and g-C3N4, ensures high Ni3+/Ni2+ ratio and more absorbed hydroxyl on the surface of CNL that can promote the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). The composite catalyst presents higher activities than the individual components g-C3N4 and LaNiO3 for both ORR and OER. In non-aqueous Li-O2 batteries, CNL shows higher capacity, lower overpotentials and better cycling stability than XC-72 carbon and LaNiO3 catalysts. Our results suggest that CNL composite is a promising cathode catalyst for Li-O2 batteries.
机译:合成了一种低成本,非贵金属复合材料g-C3N4-LaNiO3(CNL)作为锂-氧(Li-O2)电池空气电极的双功能电催化剂。组成策略改变了LaNiO3和g-C3N4的电子结构,确保了高Ni 3 + / Ni 2 + 比和CNL表面更多的吸收羟基可以促进氧还原反应(ORR)和氧释放反应(OER)。对于ORR和OER而言,复合催化剂的活性均高于单个组分g-C3N4和LaNiO3。在非水Li-O2电池中,CNL比XC-72碳和LaNiO3催化剂显示出更高的容量,更低的过电势和更好的循环稳定性。我们的结果表明,CNL复合材料是用于Li-O2电池的有希望的阴极催化剂。

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