Imperial College London
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ProfessorGeoffKelsall

Faculty of Engineering, Department of Chemical Engineering

Emeritus Professor of Electrochemical Engineering
 
 
 
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Contact

 

g.kelsall Website

 
 
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Location

 

RODH 302Roderic Hill BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Kelsall:2015:10.1016/j.electacta.2015.07.062,
author = {Kelsall, GH and Kleiminger, L and Li, K and Li, T},
doi = {10.1016/j.electacta.2015.07.062},
journal = {Electrochimica Acta},
pages = {565--577},
title = {Syngas (CO-H) production using high temperature micro-tubular solid oxide electrolysers},
url = {http://dx.doi.org/10.1016/j.electacta.2015.07.062},
volume = {179},
year = {2015}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - CO and/or HO were reduced to CO/H in micro-tubular solid oxide electrolysers with yttria-stabilized zirconia (YSZ) electrolyte, Ni-YSZ cermet cathode and strontium(II)-doped lanthanum manganite (LSM) oxygen-evolving anode. At 822 °C, the kinetics of CO reduction were slower (ca. −0.49 A cm−2 at 1.8 V) than HO reduction or co-reduction of CO and HO, which were comparable (ca. −0.83 to −0.77 A cm−2 at 1.8 V). Performances were improved (−0.85 and −1.1 A cm−2 for CO and HO electrolysis, respectively) by substituting the silver current collector with nickel and avoiding blockage of entrances to pores on the inner lumen of micro-tubes induced by silver paste applied previously to decrease contact losses. The change in current collector materials increased ohmic potential losses due to substituting the lower resistance Ag with Ni wire, but decreased electrode polarization losses by 80–93%. For co-electrolysis of CO and HO, isotopically-labelled C¹O was used to try to distinguish between direct cathodic reduction of CO and its Ni-catalysed chemical reaction with hydrogen from reduction of steam. Unfortunately, oxygen was exchanged between C¹O and H¹O, enriching oxygen-18 in the steam and substituting oxygen-16 in the carbon dioxide, so the anode off-gas isotopic fractions were meaningless. This occurred even in alumina and YSZ tubes without the micro-tubular reactor, i.e. in the absence of Ni catalyst, though not in quartz tubes. Unfortunately, larger differences between the thermal expansion coefficients of quartz and YSZ precluded using a quartz tube to house the micro-tubular reactor. However, the kinetic results, CO/H yields from off-gas analysis, diffusional considerations and model predictions of reactant and product gas adsorption on Ni suggested that syngas should be produced by electrochemical reduction of steam to H, followed by its Ni-catalysed chemical reaction with CO
AU  - Kelsall,GH
AU  - Kleiminger,L
AU  - Li,K
AU  - Li,T
DO  - 10.1016/j.electacta.2015.07.062
EP  - 577
PY  - 2015///
SN  - 1873-3859
SP  - 565
TI  - Syngas (CO-H) production using high temperature micro-tubular solid oxide electrolysers
T2  - Electrochimica Acta
UR  - http://dx.doi.org/10.1016/j.electacta.2015.07.062
UR  - http://hdl.handle.net/10044/1/25326
VL  - 179
ER  -
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