Journal ArticleDOI
Oxygen reduction in nanoporous metal–ionic liquid composite electrocatalysts
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TLDR
It is shown that a tailored geometric and chemical materials architecture can further improve ORR catalysis by demonstrating that a composite nanoporous Ni-Pt alloy impregnated with a hydrophobic, high-oxygen-solubility and protic ionic liquid has extremely high mass activity.Abstract:
The improvement of catalysts for the oxygen-reduction reaction is an important challenge for fuel cells and other electrochemical-energy technologies. A composite nanoporous Ni–Pt alloy with a tailored geometric architecture is now shown to exhibit high mass activity for oxygen reduction.read more
Citations
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Journal ArticleDOI
Electrocatalyst approaches and challenges for automotive fuel cells
TL;DR: Taking the step towards successful commercialization requires oxygen reduction electrocatalysts that meet exacting performance targets, and these catalyst systems will need to be highly durable, fault-tolerant and amenable to high-volume production with high yields and exceptional quality.
Journal ArticleDOI
Recent Advances in Electrocatalysts for Oxygen Reduction Reaction
TL;DR: This comprehensive Review focuses on the low- and non-platinum electrocatalysts including advanced platinum alloys, core-shell structures, palladium-based catalysts, metal oxides and chalcogenides, carbon-based non-noble metal catalysts and metal-free catalysts.
Journal ArticleDOI
Highly Crystalline Multimetallic Nanoframes with Three-Dimensional Electrocatalytic Surfaces
Chen Chen,Yijin Kang,Ziyang Huo,Ziyang Huo,Zhongwei Zhu,Zhongwei Zhu,Wenyu Huang,Wenyu Huang,Huolin L. Xin,Joshua Snyder,Dongguo Li,Jeffrey A. Herron,Manos Mavrikakis,Miaofang Chi,Karren L. More,Yadong Li,Nenad M. Markovic,Gabor A. Somorjai,Gabor A. Somorjai,Peidong Yang,Vojislav R. Stamenkovic +20 more
TL;DR: A highly active and durable class of electrocatalysts is synthesized by exploiting the structural evolution of platinum-nickel (Pt-Ni) bimetallic nanocrystals by exploitingThe starting material, crystalline PtNi3 polyhedra, transforms in solution by interior erosion into Pt3Ni nanoframes with surfaces that offer three-dimensional molecular accessibility.
Journal ArticleDOI
Sulfur-doped graphene as an efficient metal-free cathode catalyst for oxygen reduction.
Zhi Yang,Zhen Yao,Guifa Li,Guoyong Fang,Huagui Nie,Zheng Liu,Xuemei Zhou,Xi'an Chen,Shaoming Huang +8 more
TL;DR: The experimental results are believed to be significant because they not only give further insight into the ORR mechanism of these metal-free doped carbon materials, but also open a way to fabricate other new low-cost NPMCs with high electrocatalytic activity by a simple, economical, and scalable approach for real FC applications.
Journal ArticleDOI
A selective and efficient electrocatalyst for carbon dioxide reduction
Qi Lu,Jonathan Rosen,Yang Zhou,Gregory S. Hutchings,Yannick C. Kimmel,Jingguang G. Chen,Feng Jiao +6 more
TL;DR: A nanoporous silver electrocatalyst is reported that is able to electrochemically reduce carbon dioxide to carbon monoxide with approximately 92% selectivity at a rate over 3,000 times higher than its polycrystalline counterpart under moderate overpotentials of <0.50 V.
References
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Journal ArticleDOI
Activity benchmarks and requirements for Pt, Pt-alloy, and non-Pt oxygen reduction catalysts for PEMFCs
TL;DR: In this article, the authors quantified the activities and voltage loss modes for state-of-the-art MEAs (membrane electrode assemblies), specifies performance goals needed for automotive application, and provides benchmark oxygen reduction activities for state of the art platinum electrocatalysts.
Journal ArticleDOI
Improved Oxygen Reduction Activity on Pt3Ni(111) via Increased Surface Site Availability
Vojislav R. Stamenkovic,Vojislav R. Stamenkovic,Ben Fowler,Bongjin Simon Mun,Guofeng Wang,Philip N. Ross,Chris Lucas,Nenad M. Markovic +7 more
TL;DR: It is demonstrated that the Pt3Ni( 111) surface is 10-fold more active for the ORR than the corresponding Pt(111) surface and 90-foldMore active than the current state-of-the-art Pt/C catalysts for PEMFC.
Journal ArticleDOI
Trends in electrocatalysis on extended and nanoscale Pt-bimetallic alloy surfaces
Vojislav R. Stamenkovic,Vojislav R. Stamenkovic,Bongjin Simon Mun,Bongjin Simon Mun,Matthias Arenz,Karl Johann Jakob Mayrhofer,Chris Lucas,Guofeng Wang,Philip N. Ross,Nenad M. Markovic +9 more
TL;DR: The electrocatalytic trends established for extended surfaces are used to explain the activity pattern of Pt(3)M nanocatalysts as well as to provide a fundamental basis for the catalytic enhancement of cathode catalysts.
Journal ArticleDOI
Pd-Pt Bimetallic Nanodendrites with High Activity for Oxygen Reduction
Byungkwon Lim,Majiong Jiang,Pedro H. C. Camargo,Eun Chul Cho,Jing Tao,Xianmao Lu,Yimei Zhu,Younan Xia +7 more
TL;DR: Pd-Pt bimetallic nanodendrites consisting of a dense array of Pt branches on a Pd core by reducing K2PtCl4 with L-ascorbic acid in the presence of uniform Pd nanocrystal seeds in an aqueous solution showed relatively large surface areas and particularly active facets toward the oxygen reduction reaction (ORR), the rate-determining step in a proton-exchange membrane fuel cell.
Journal ArticleDOI
Alloys of platinum and early transition metals as oxygen reduction electrocatalysts
Jeffrey Greeley,Ifan E. L. Stephens,Alexander S. Bondarenko,Tobias Peter Johansson,Heine Anton Hansen,Thomas F. Jaramillo,Thomas F. Jaramillo,Jan Rossmeisl,Ib Chorkendorff,Jens K. Nørskov +9 more
TL;DR: A new set of ORR electrocatalysts consisting of Pd or Pt alloyed with early transition metals such as Sc or Y, identified using density functional theory calculations as being the most stable Pt- and Pd-based binary alloys with ORR activity likely to be better than Pt.