Patents Assigned to Johnson Matthey Fuel Cells Limited
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Patent number: 9127182Abstract: A polymer dispersion comprising one or more proton-conducting polymer materials in a liquid medium, and an electrocatalyst ink comprising one or more electrocatalyst materials and one or more proton-conducting polymer materials in a liquid medium are disclosed. The polymer dispersion and the electrocatalyst ink further comprise a protic acid. Electrocatalyst layers, gas diffusion electrodes, catalyzed membranes and membrane electrode assemblies prepared using the dispersion and/or the ink are also disclosed.Type: GrantFiled: May 17, 2006Date of Patent: September 8, 2015Assignee: JOHNSON MATTHEY FUEL CELLS LIMITEDInventors: Dharshini Chryshantha Fongalland, Pamela Kapila, Chandresh Nemchand Malde, Michael Ian Petch
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Patent number: 9083012Abstract: A membrane electrode assembly comprises an ion-conducting membrane; a first electrocatalyst layer having a surface facing the membrane; a first electronically-conducting porous gas diffusion substrate facing the other surface of the first electrocatalyst layer; and a first film member interposed between the membrane and the first electrocatalyst layer. The first electrocatalyst layer has an edge region and a central region, and the first film member contacts the edge region and not the central region. A first adhesive layer is present on the surface of the first film member facing the first electrocatalyst layer, and the first adhesive layer adheres the first film member to the first electrocatalyst layer, impregnates through the first electrocatalyst layer, and impregnates into the first gas diffusion substrate.Type: GrantFiled: September 22, 2005Date of Patent: July 14, 2015Assignees: JOHNSON MATTHEY FUEL CELLS LIMITED, GENERAL MOTORS CORPORATIONInventors: Catherine Helen de Rouffignac, Hubert Gasteiger, Adam John Hodgkinson, Peter Anthony Trew, Bhaskar Sompalli, Susan Yan, Brian Litteer
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Publication number: 20150086902Abstract: A catalytic material includes (i) a support material and (ii) a thin film catalyst coating having an inner face adjacent to the support material and an outer face, the thin film catalyst coating having a mean thickness of ?8 nm, and wherein at least 40% of the support material surface area is covered by the thin film catalyst coating; and wherein the thin film catalyst coating includes a first metal and one or more second metals, and wherein the atomic percentage of first metal in the thin film catalyst coating is not uniform through the thickness of the thin film catalyst coating.Type: ApplicationFiled: March 28, 2013Publication date: March 26, 2015Applicant: JOHNSON MATTHEY FUEL CELLS LIMITEDInventors: Graham Alan Hards, Ian Roy Harkness, Michael Ian Petch, Jonathan David Brereton Sharman, Edward Anthony Wright, Alexander Martin Willcocks
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Publication number: 20140205928Abstract: A platinum alloy catalyst PtXY, wherein X is nickel, cobalt, chromium, copper, titanium or manganese and Y is tantalum or niobium, characterised in that in the alloy the atomic percentage of platinum is 46-75 at %, of X is 1-49 at % and of Y is 1-35 at %; provided that the alloy is not 66 at % Pt 20 at % Cr14 at % Ta or 50 at % Pt, 25 at % Co, 25 at % Ta is disclosed. The catalyst has particular use as an oxygen reduction catalyst in fuel cells, and in particular in phosphoric acid fuel cells.Type: ApplicationFiled: March 25, 2014Publication date: July 24, 2014Applicant: JOHNSON MATTHEY FUEL CELLS LIMITEDInventors: Sarah BALL, Thomas Robertson RALPH, Brian Ronald THEOBALD, David THOMPSETT
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Publication number: 20130330651Abstract: A catalyst layer including an electrocatalyst and an oxygen evolution catalyst, wherein the oxygen evolution catalyst includes a crystalline metal oxide including: (i) one of more first metals selected from the group consisting of yttrium, lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, magnesium, calcium, strontium, barium, sodium, potassium, indium, thallium, tin, lead, antimony and bismuth; (ii) one or more second metals selected from the group consisting of Ru, Ir, Os and Rh; and (iii) oxygen characterised in that: (a) the atomic ratio of first metal(s):second metal(s) is from 1:1.5 to 1.5:1 (b) the atomic ratio of (first metal(s)+second metal(s)):oxygen is from 1:1 to 1:2 is disclosed.Type: ApplicationFiled: December 14, 2011Publication date: December 12, 2013Applicant: Johnson Matthey Fuel Cells LimitedInventors: David Thompsett, Edward Anthony Wright, Janet Mary Fisher, Enrico Petrucco
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Patent number: 8551668Abstract: A sealed and/or reinforced membrane electrode assembly is disclosed. Encapsulation films, each comprising a backing layer and an adhesive layer, are positioned on the edges of at least one face of each gas diffusion substrate such that the adhesive layers impregnate into each gas diffusion substrate. Methods of forming sealed and/or reinforced membrane electrode assemblies are also disclosed.Type: GrantFiled: October 17, 2012Date of Patent: October 8, 2013Assignee: Johnson Matthey Fuel Cells LimitedInventors: Silvain Buche, Adam John Hodgkinson, Catherine Helen de Rouffignac, Jonathan David Brereton Sharman
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Publication number: 20130224623Abstract: A membrane, suitable for use in a fuel cell, comprises: (a) a central region comprising an ion-conducting polymeric material; (b) a border region which creates a frame around the central region and which consists of one or more non-ion-conducting materials wherein at least one of the one or more non-ion-conducting materials forms a layer; wherein the non-ion-conducting material of the border region overlaps the ion-conducting polymeric material of the central region by 0 to 10 mm in an overlap region.Type: ApplicationFiled: July 21, 2011Publication date: August 29, 2013Applicant: JOHNSON MATTHEY FUEL CELLS LIMITEDInventors: David Edward Barnwell, Peter Antony Trew, Thomas Robertson Ralph, Robert Jeffrey Coleman
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Publication number: 20130209912Abstract: A platinum alloy catalyst PtXY, wherein X is a transition metal (other than platinum, palladium or iridium) and Y is a transition metal (other than platinum, palladium or iridium) which is less leachable than X in an acidic environment, has an atomic percentage in the alloy of platinum is from 20.5-40 at %, of X is from 40.5-78.5 at % X and of Y is from 1-19.5 at %.Type: ApplicationFiled: July 21, 2011Publication date: August 15, 2013Applicant: JOHNSON MATTHEY FUEL CELLS LIMITEDInventors: Brian Ronald Charles Theobald, Sarah Caroline Ball, Rachel Louise O'Malley, David Thompsett, Graham Alan Hards
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Patent number: 8399145Abstract: A membrane electrode assembly having a peripheral edge region and a central region. The membrane electrode assembly comprises an ion-conducting membrane, first and second electrocatalyst layers disposed either side of the ion-conducting membrane, and first and second gas diffusion layers disposed either side of the first and second electrocatalyst layers respectively. The membrane electrode assembly further comprises an edge protection member, the edge protection member comprising a film layer, a bonding layer, and one or more additives selected from the group consisting of free radical decomposition catalyst, self regenerating antioxidant, hydrogen donors (H-donor) primary antioxidant, free radical scavenger secondary antioxidant, oxygen absorbers (oxygen scavenger) and elemental palladium.Type: GrantFiled: September 18, 2008Date of Patent: March 19, 2013Assignee: Johnson Matthey Fuel Cells LimitedInventors: David Edward Barnwell, Thomas Robertson Ralph, Peter Anthony Trew
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Patent number: 8367266Abstract: A porous catalyst layer formed from discrete particles of unsupported metal, wherein at least 80%, suitably at least 90%, of the discrete particles have a mass of from 1 to 1000 zeptograms, and wherein the catalyst layer has a metal volume fraction of less than 30% and a metal loading of less than 0.09 mg/cm2 is disclosed. The catalyst layer is suitable for use in fuel cells and other electrochemical applications.Type: GrantFiled: June 19, 2008Date of Patent: February 5, 2013Assignee: Johnson Matthey Fuel Cells LimitedInventors: Ian Roy Harkness, Jonathan David Brereton Sharman, Edward Anthony Wright
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Patent number: 8318373Abstract: An MEA comprising: (i) a central first conductive gas diffusion substrate having a first face and a second face; (ii) first and second catalyst layers each having a first and second face and wherein the first face of the first catalyst layer is in contact with the first face of the gas diffusion substrate and the first face of the second catalyst layer is in contact with the second face of the gas diffusion substrate; (iii) first and second electrolyte layers each having a first and second face and wherein the first face of the first electrolyte layer is in contact with the second face of the first catalyst layer and the first face of the second electrolyte layer is in contact with the second face of the second catalyst layer; (iv) third and fourth catalyst layers each having a first and second face and wherein the first face of the third catalyst layer is in contact with the second face of the first electrolyte layer and the first face of the fourth catalyst layer is in contact with the second face of the seType: GrantFiled: September 11, 2007Date of Patent: November 27, 2012Assignee: Johnson Matthey Fuel Cells LimitedInventors: Hanna Katariina Rajantie, Jonathan David Brereton Sharman, David Thompsett, David Emmerson Brown, Stephen Robert Tennison, Beverley Sowerby, Vlad Strelko
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Patent number: 8309268Abstract: A sealed and/or reinforced membrane electrode assembly is disclosed. Encapsulation films, each comprising a backing layer and an adhesive layer, are positioned on the edges of at least one face of each gas diffusion substrate such that the adhesive layers impregnate into each gas diffusion substrate. Methods of forming sealed and/or reinforced membrane electrode assemblies are also disclosed.Type: GrantFiled: August 2, 2004Date of Patent: November 13, 2012Assignee: Johnson Matthey Fuel Cells LimitedInventors: Silvain Buche, Adam John Hodgkinson, Catherine Helen de Rouffignac, Jonathan David Brereton Sharman