Bi containing solid oxide fuel cell system with improved performance and reduced manufacturing costs

A solid oxide and fuel cell technology, used in solid electrolyte fuel cells, fuel cells, fuel cell grouping, etc., can solve the problems of difficult-to-densify interconnection material manufacturing, etc., to reduce the densification temperature and reduce the thickness of the electrolyte. , the effect of reducing the kinetic resistance of the battery

Inactive Publication Date: 2012-05-16
SIEMENS ENERGY INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Plasma spraying has been used in the fabrication of various SOFC components, however, plasma spraying is difficult to use in the fabrication of dense interconnect materials

Method used

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  • Bi containing solid oxide fuel cell system with improved performance and reduced manufacturing costs
  • Bi containing solid oxide fuel cell system with improved performance and reduced manufacturing costs
  • Bi containing solid oxide fuel cell system with improved performance and reduced manufacturing costs

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Embodiment Construction

[0034] It has been found that: adding bismuth compounds to figure 1 with figure 2 The electrolyte in the solid oxide fuel cell will improve battery performance. The electrolyte in all fuel cells is arranged between the inner air electrolyte and the outer fuel electrode. It has been found that: in particular, Bi 2 O 3 It is an excellent oxygen ion conductor. Its oxygen ion conductivity is lower than ScSZ 2 orders of magnitude higher, and Bi 2 O 3 It is a good catalyst for oxygen reduction. Its presence near or at the air electrode-electrolyte interface, or as a very thin 1 to 50 micron separation interlayer between the electrolyte and the air electrode, will reduce the dynamic resistance of the battery (especially at low temperatures). Improved battery performance is expected in terms of voltage versus current density. At 100 mA / cm 2 It has shown an improvement of more than 100 mV at 700°C.

[0035] In addition, Bi 2 O 3 Effectively eliminate the microcracks in the electrol...

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PUM

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Abstract

A method to provide a tubular, triangular or other type solid oxide electrolyte fuel cell (10, 30) has steps including providing a porous air electrode (14, 40, 40') cathode support substrate, applying a solid electrolyte (16, 42) and cell to cell interconnection (22, 40') on the air electrode, applying a layer of bismuth compounds (44) on the surface of the electrolyte and possibly also the interconnection, and sintering the whole above the melting point of the bismuth compounds for the bismuth compounds to permeate and for densification.

Description

[0001] Government contract [0002] According to the contract No. DE-FC26-05NT42613 issued by the US Department of Energy, the US government has rights to this invention. Technical field [0003] The present invention relates to the electrolyte reinforcement of the interlayer and electrolyte of tubular and delta solid oxide electrolyte fuel cells (SOFC). Background technique [0004] High temperature solid oxide electrolyte fuel cells (SOFC) have shown the potential for high efficiency and low pollution in power generation. The successful operation of SOFCs for power generation has been limited to temperatures around 900-1,000°C in the past due to insufficient electrolyte conductivity and high air electrode polarization losses at lower temperatures. U.S. Patent Nos. 4,490,444 and 5,916,700 (Isenberg and Ruka et al., respectively) disclose a type of standard, solid oxide tubular elongated, hollow-type fuel cell, which can operate at the above-mentioned relatively high temperature. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/12H01M8/24
CPCH01M8/243Y02E60/521Y02E60/525H01M8/1266Y02E60/50Y10T29/49115Y02P70/50
Inventor 张弓R.J.鲁卡路春
Owner SIEMENS ENERGY INC
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