MCFC with immersed spiral metal wire electrodes

significant barriers to high-performance operation

applications put restraints on such devices when

arc) and hydrogen

dissociative

of traditional

at elevated

it comes to cost, weight and size. No commercial

(medium-frequency

arc), but little effect on the

temperatures, where the relative humidity may be

products can meet the requirements with respect

low-frequency

reduced. This work reports on approaches to the

to both cost and performance.

for charge-transfer

development of high-temperature

voltage measurements

PEM

fuel

cells

membranes for

Individual

cell

are crucial to protect the

chemisorption

resistances

and hydrogen

dissociative

in a fuel cell with low metal

fuel cell stack and ensure

acid membranes were prepared to improve water

lifetime.

retention, and non-aqueous

individual cell voltages in large fuel ceI1 stacks

concentration.

membranes were prepared to circumvent the loss

and their potential accuracy are discussed here. A

is the main part at high temperature, irrespective

of water. Experimental

novel

of

results for composite

Different

low-cost,

concepts

lightweight

for measuring

and

membranes of NaEon@ and zirconium phosphate

multiplexer circuit was implemented

showed

resistor-diode

improved

operation

temperatures. Imidazole-impregnated

at

elevated

membranes

prototype

stack

arc. The polarization

PEM fuel cells; composite perfluorinated sulfonic proton-conducting

maximum

chemisorption

compact

loading are larger than those with high metal loading, and increase greatly with increasing CO

CO

Although the cathode impedance

concentration

(5100

ppm).

based on a

impedance

of the full-cell depends

circuit. Based on this circuit, a

impedance

at low temperature

80-channel

multiplexer

device was

concentration.

poisoned the electrocatalysts. Cesium hydrogen sulfate membranes

satisfactory speed and accuracy.

Nagai: J of Power Sources 103(l) 127-133 (30

D. Webb and S. Moller-Hoist: j. ofPower Sources

December 200 1).

appreciable

current.

A

brief

analysis

of

temperature requirements for CO tolerance and a

on a fuel cell stack with

on anode

and high CO

built

were not able to produce

and tested

the

103(l) 54-60 (30 December 2001).

framework for understanding water loss from fire1 cell membranes are also presented. C. Yang, I? Costamagna,

S. Srinivasan,

J.

Benziger and A.B. Bocarsly: 1. of Power Sources 103(l) l-9 (30 December 2001).

Measuring in stacks

individual

The requirements are becoming

for stack monitoring

devices

stricter as fuel cell technology

reaches an advanced stage of development moves towards

commercialization.

and

Different

Approaching water-gas shift reaction equilibrium in SOFCs

Effect of CO and anode-Mel loading on PEMFC H, oxidation The effect of CO gas and anode-metal on H,

cell voltages

oxidation

in a PEM

The reverse water-gas shift reaction was carried loading

fuel cell were

the experimental

the half-cell

reaction was close to equilibrium

(cathode

side: H,,

anode side:

Durable fuel cell assembly with reduced thermal stresses Applicants: Honda Motor Co, Japan and Stanford University, USA Patent numbs: WO 01~954~

Fuel cell assembly allows electrolyte to expand into fuel/oxidizer for minimized stresses Applicants: Honda Motor Co, Japan and Stanford Universi+ USA Patent number: WO OU95405

Fuel Cells Bulletin No. 43

data. The

water-gas

shift

only at high

simulated gas) and full-cell (cathode side: O,,

levels of fuel utilization.

finding for fuel cell modeling and simulation.

impedance spectroscopy. on the charge-transfer

by AC

CO has a great effect

reaction (high-frequency

Simple fuel cell assembly with heater and sensors formed in flow distribution plate(s) Applicants: Honda Motor Co, Japan and St+&-d University, USA Patent number: WO 01195407

Joint-cycle high-efficiency reformer/fuel cell system with power-generating turbine Applicant: Nuvera, U&X Patent number: WO 01/954~9

MCFC with immersed wire electrodes

spiral metal

Applicant: Aquuri~ lkhnologie, Patent number: WO 01/95414

Bahamas

Fuel cell system with battery supported start-up

to

equilibrium was calculated from

anode side: simulated gas) determined

Applicants: Honda Motor Co, Japan and Stanjhd Unive+, USA Patent number: WO 01/9_5406

Applicant: Sanyo Ekrac, Japan Patent number: US 6329094

of this reaction

voltage loss was measured, and the impedance of

Compact, ligh~eight PEMFC stack with high degree of freedom for mounting

PEMFC with extended flow passages gives stable, long-term operation

levels, and the approach thermodynamic

Thin, common-plane fuel cell assembly for favorable electrical properties

Industrial!, Japan

out in a SOFC at a range of fuel utilization

investigated here. To investigate these effects, the

Patents

Applicant: Matsusha Ekric Patent number: US 6329093

J.-D. Kim, Y.-I. Park, K. Kobayashi and M.

This is an important

K. Ahmed and K. Foger: J of Power Sources 103(I) 150-153 (30 December 2001).

Applicant: Atecs Mannesmann, Germany Patent number: WO OU9.5415

Perforated interconne~ temperature fuel cells

for high-

Applicant: Forscbungszentrum /i&b, Patent number: WO 01/95416

Germany

Safe fuel supply system for vehicular fuel cell Applicant: Toyota Motor Corporation, Japan Patent numbs: WO Or/95417

Fuel cell system with improved on/off switching dynamics Applicant: Atecs Mannesmunn, Germany Patent number: WO Or/95419

Easy application of solid electrolytic layer to porous SOFC electrode Applicann: Siemens and Forschungszentrum J&b, Germany Patent numbs: WO 01/95420

Fuel cell operating system minimizes free liquid water in the plant

ii.7