首页|An efficient electrode for reversible oxygen reduction/evolution and ethylene electro-production on protonic ceramic electrochemical cells

An efficient electrode for reversible oxygen reduction/evolution and ethylene electro-production on protonic ceramic electrochemical cells

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Protonic ceramic electrochemical cells(PCECs)have demonstrated great promise for applications in the generation of electricity,and the synthesis of chemicals(for example,ethylene).However,enhancing the electrochemical reactions kinetics and stability of PCECs electrodes is one grand challenge.Here,we pre-sent a novel electrode material via a co-doping of cesium(Cs)and niobium(Nb)on PrBaCo2O6_δ with the composition of PrBao,9Cso.iCo1.9Nbo.1O6_δ(PBCCN),which naturally decomposes into dual phases of a double-perovskite PBCCN(DP-PBCCN,~92.3 wt%)and a single-perovskite Bao.9Cso.1Coo.95Nbo.o5O3_i(SP-BCCN,~7.7 wt%)under typical powder processing conditions.PBCCN exhibits a low area-specific resistance(ASR)value of 0.107 Ω cm2,an outstanding performance of 2.04 W cm-2 in fuel cell(FC)mode,a current density of-2.84 A cm-2 at 1.3 V in electrolysis cell(EC)mode,and promising reversible oper-ational durability of 53 cycles in~212 h at+/-0.5 A cm-2 and 650 ℃.Cs doping generates more oxygen vacancies and accelerates the oxygen exchange kinetics,while Nb doping effectively enhances the stabil-ity,as illustrated by the analyses of X-ray photoelectron spectroscopy,and electrical conductivity relax-ations.When applied as the positrode for electrochemical non-oxidative dehydrogenation of ethane(C2H6)to ethylene(C2H4)on PCECs,it displays an encouraging C2H6 conversion of 12.75%and a C2H4 selectivity of 98.4%at 1.2 V.

Protonic ceramic electrochemical cellsDouble-perovskite oxideEthylene electro-productionElectrochemical nonoxidativedehydrogenationOxygen reduction/evolution reaction

Yangsen Xu、Kang Xu、Hua Zhang、Feng Zhu、Fan He、Ying Liu、Yu Chen

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School of Environment and Energy,South China University of Technology,Guangzhou 510006,China

Research Institute of Renewable Energy and Advanced Materials,Zijin Mining Group Co.,Ltd.,Xiamen 361101,China

2024

科学通报(英文版)
中国科学院

科学通报(英文版)

CSTPCD
ISSN:1001-6538
年,卷(期):2024.69(23)