Nanoporous Ru as a carbon- and binder-free cathode for Li-O2 batteries.

Porous carbon-free cathodes are critical to achieve a high discharge capacity and efficient cycling for rechargeable Li-O2 battery. Herein, we present a very simple method to directly grow nanoporous Ru (composed of polycrystalline particles of ∼5 nm) on one side of a current collector of Ni foam via a galvanic replacement reaction. The resulting Ru@Ni can be employed as a carbon- and binder-free cathode for Li-O2 batteries and delivers a specific capacity of 3720 mAh gRu (-1) at a current density of 200 mA gRu (-1) . 100 cycles of continuous discharge and charge are obtained at a very narrow terminal voltage window of 2.75∼3.75 V with a limited capacity of 1000 mAh gRu (-1) . The good performance of the nanoporous Ru@Ni cathode can be mainly attributed to the effective suppression of the by-products related to carbon or binder, the good adhesion of the catalyst to the current collector, and the good permeation of O2 and electrolyte into the active sites of the nanoporous Ru with the open pore system. This new type electrode provides a snapshot toward developing high-performance carbon- and binder-free Li-O2 batteries.

[1]  Z. Wen,et al.  A free-standing-type design for cathodes of rechargeable Li–O2 batteries , 2011 .

[2]  Dan Sun,et al.  A solution-phase bifunctional catalyst for lithium-oxygen batteries. , 2014, Journal of the American Chemical Society.

[3]  Yuhui Chen,et al.  Charging a Li-O₂ battery using a redox mediator. , 2013, Nature chemistry.

[4]  Y. Ein‐Eli,et al.  Realization of an Artificial Three‐Phase Reaction Zone in a Li–Air Battery , 2014 .

[5]  Jean-Marie Tarascon,et al.  Li-O2 and Li-S batteries with high energy storage. , 2011, Nature materials.

[6]  Tao Zhang,et al.  Ru/ITO: a carbon-free cathode for nonaqueous Li-O2 battery. , 2013, Nano letters.

[7]  Sanjeev Mukerjee,et al.  Elucidating the Mechanism of Oxygen Reduction for Lithium-Air Battery Applications , 2009 .

[8]  Ping He,et al.  Core-shell-structured CNT@RuO(2) composite as a high-performance cathode catalyst for rechargeable Li-O(2) batteries. , 2014, Angewandte Chemie.

[9]  Li Zhang,et al.  Carbon and binder free rechargeable Li–O2 battery cathode with Pt/Co3O4 flake arrays as catalyst , 2014 .

[10]  Weiqiao Jiang,et al.  Bacteria-template synthesized silver microspheres with hollow and porous structures as excellent SERS substrate , 2010 .

[11]  W. Bennett,et al.  Hierarchically porous graphene as a lithium-air battery electrode. , 2011, Nano letters.

[12]  Yuhui Chen,et al.  A stable cathode for the aprotic Li-O2 battery. , 2013, Nature materials.

[13]  Tao Zhang,et al.  Challenges of non-aqueous Li–O2 batteries: electrolytes, catalysts, and anodes , 2013 .

[14]  Hun‐Gi Jung,et al.  An improved high-performance lithium-air battery. , 2012, Nature chemistry.

[15]  Dan Xu,et al.  A stable sulfone based electrolyte for high performance rechargeable Li-O2 batteries. , 2012, Chemical communications.

[16]  Sanjeev Mukerjee,et al.  Studies of Li-Air Cells Utilizing Dimethyl Sulfoxide-Based Electrolyte , 2013 .

[17]  Tao Zhang,et al.  From Li-O2 to Li-air batteries: carbon nanotubes/ionic liquid gels with a tricontinuous passage of electrons, ions, and oxygen. , 2012, Angewandte Chemie.

[18]  Linda F. Nazar,et al.  Screening for superoxide reactivity in Li-O2 batteries: effect on Li2O2/LiOH crystallization. , 2012, Journal of the American Chemical Society.

[19]  K. M. Abraham,et al.  A Polymer Electrolyte‐Based Rechargeable Lithium/Oxygen Battery , 1996 .

[20]  P. Bruce,et al.  A Reversible and Higher-Rate Li-O2 Battery , 2012, Science.

[21]  E. Plichta,et al.  Solvent-Coupled Catalysis of the Oxygen Electrode Reactions in Lithium-Air Batteries , 2014 .

[22]  Xin-bo Zhang,et al.  Graphene Oxide Gel‐Derived, Free‐Standing, Hierarchically Porous Carbon for High‐Capacity and High‐Rate Rechargeable Li‐O2 Batteries , 2012 .

[23]  Sanjeev Mukerjee,et al.  Influence of Nonaqueous Solvents on the Electrochemistry of Oxygen in the Rechargeable Lithium−Air Battery , 2010 .

[24]  V. T. D'Souza,et al.  Preparation and Characterization of Porous Gold and its Application as a Platform for Immobilization of Acetylcholine Esterase. , 2007, Chemistry of materials : a publication of the American Chemical Society.

[25]  Jun Lu,et al.  The effect of oxygen crossover on the anode of a Li-O(2) battery using an ether-based solvent: insights from experimental and computational studies. , 2013, ChemSusChem.

[26]  Yongyao Xia,et al.  Synthesis of ruthenium oxide coated ordered mesoporous carbon nanofiber arrays as a catalyst for lithium oxygen battery , 2015 .

[27]  J. Satcher,et al.  Synthesis and Characterization of Hierarchical Porous Gold Materials , 2006 .

[28]  Stefan A. Freunberger,et al.  Li-O2 battery with a dimethylformamide electrolyte. , 2012, Journal of the American Chemical Society.

[29]  Sanjeev Mukerjee,et al.  Oxygen Electrode Rechargeability in an Ionic Liquid for the Li–Air Battery , 2011 .

[30]  Yungui Chen,et al.  An in situ formed Pd nanolayer as a bifunctional catalyst for Li-air batteries in ambient or simulated air. , 2013, Chemical Communications.

[31]  Rak-Hyun Song,et al.  Carbon-free cobalt oxide cathodes with tunable nanoarchitectures for rechargeable lithium-oxygen batteries. , 2013, Chemical communications.

[32]  Stefan A Freunberger,et al.  The carbon electrode in nonaqueous Li-O2 cells. , 2013, Journal of the American Chemical Society.

[33]  Bin Zhang,et al.  Recent advances in porous Pt-based nanostructures: synthesis and electrochemical applications. , 2014, Chemical Society reviews.

[34]  Hun‐Gi Jung,et al.  Ruthenium-based electrocatalysts supported on reduced graphene oxide for lithium-air batteries. , 2013, ACS nano.

[35]  Hubert A. Gasteiger,et al.  Method Development to Evaluate the Oxygen Reduction Activity of High-Surface-Area Catalysts for Li-Air Batteries , 2011 .

[36]  Hong Yang,et al.  Synthesis of porous platinum nanoparticles. , 2006, Small.

[37]  Chao Cheng,et al.  Urchin-like Ni-P microstructures: facile synthesis, properties and application in the fast removal of heavy-metal ions. , 2011, Chemical communications.

[38]  S. Shi,et al.  Exploration on the possibility of Ni foam as current collector in rechargeable lithium-air batteries , 2013 .

[39]  Dan Xu,et al.  3D ordered macroporous LaFeO3 as efficient electrocatalyst for Li–O2 batteries with enhanced rate capability and cyclic performance , 2014 .