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二氧化钛/氮掺杂石墨烯复合材料作为非贵金属双功能氧电催化剂

Titanium Dioxide/N-Doped Graphene Composites as Non-Noble Bifunctional Oxygen Electrocatalysts.

作者信息

Luque-Centeno José Manuel, Martínez-Huerta María Victoria, Sebastián David, Pérez-Rodríguez Sara, Lázaro María Jesús

机构信息

Instituto de Catálisis y Petroleoquímica (CSIC), Marie Curie 2, 28049, Madrid, Spain.

Instituto de Carboquímica (CSIC), Miguel Luesma Castán 4, 50018, Zaragoza, Spain.

出版信息

Ind Eng Chem Res. 2021 Dec 29;60(51):18817-18830. doi: 10.1021/acs.iecr.1c02896. Epub 2021 Nov 19.

DOI:10.1021/acs.iecr.1c02896
PMID:35645458
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9134212/
Abstract

Bifunctional oxygen electrocatalysts are essential in the development of low-temperature unitized regenerative fuel cells (URFCs), as a promising alternative for storing energy via hydrogen. TiO, as a semiconductor material, is commonly not established as an active electrocatalyst for oxygen reduction and oxygen evolution due to its poor electrical conductivity and low reactivity. Here, we demonstrated that composites composed of TiO and N-doped graphene can be active in oxygen reduction and evolution reactions in an alkaline environment. Combination factors such anatase/rutile interaction, N-doping graphene, and the presence of Ti/Ti-N species raise the active sites and improve the electrochemical activity. Our results may afford an opportunity to develop a non-noble and promising electrocatalyst in energy storage technology.

摘要

双功能氧电催化剂对于低温一体化再生燃料电池（URFC）的发展至关重要，URFC是一种通过氢气储存能量的有前景的替代方案。TiO作为一种半导体材料，由于其导电性差和反应活性低，通常不作为氧还原和析氧的活性电催化剂。在此，我们证明了由TiO和N掺杂石墨烯组成的复合材料在碱性环境中对氧还原和析氧反应具有活性。诸如锐钛矿/金红石相互作用、N掺杂石墨烯以及Ti/Ti-N物种的存在等复合因素增加了活性位点并提高了电化学活性。我们的结果可能为储能技术中开发一种非贵金属且有前景的电催化剂提供机会。

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