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Achieving 360 NL h −1 Hydrogen Production Rate Through 30‐Cell Solid Oxide Electrolysis Stack with LSCF–GDC Composite Oxygen Electrode
Author(s) -
Zheng Y.,
Chen T.,
Li Q.,
Wu W.,
Miao H.,
Xu C.,
Wang W. G.
Publication year - 2014
Publication title -
fuel cells
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.485
H-Index - 69
eISSN - 1615-6854
pISSN - 1615-6846
DOI - 10.1002/fuce.201400051
Subject(s) - electrolysis , hydrogen production , stack (abstract data type) , high temperature electrolysis , materials science , hydrogen , electrode , oxide , clark electrode , current density , volumetric flow rate , oxygen , solid oxide fuel cell , chemical engineering , analytical chemistry (journal) , anode , chemistry , metallurgy , electrolyte , chromatography , thermodynamics , physics , organic chemistry , quantum mechanics , computer science , programming language , engineering
A 30‐cell solid oxide electrolysis (SOE) stack consisting of 30‐cell planar Ni–YSZ hydrogen electrode‐supported single cell with La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3– δ –Ce 0.9 Gd 0.1 O 1.95 (LSCF–GDC) composite oxygen electrodes, interconnects, and sealing materials was tested at 750 °C in steam electrolysis mode for hydrogen production. The direction of gas flow in the stack was a cross‐flow configuration, and the stack configuration was designed to open gas flow channels at the air outlet. The electrolysis efficiency of the stack was higher than 100% at 90/10H 2 O/H 2 ratio under <0.5 A cm −2 current density. During hydrogen production, the stack was operated at 750 °C under 0.5 A cm −2 constant current density for more than 500 h with 4.06% k h −1 degradation rate. Up to 73% steam conversion rate and 91.6% current efficiency were obtained; the net hydrogen production rate reached as high as 361.4 NL h −1 . Our results suggested that the SOE stack that was designed with LSCF–GDC composite oxygen electrode could be used to conduct large‐scale hydrogen production.