Co-reporter:Kamel Eid, Hongjing Wang, Pei He, Kunmiao Wang, Tansir Ahamad, Saad M. Alshehri, Yusuke Yamauchi and Liang Wang
Nanoscale 2015 vol. 7(Issue 40) pp:16860-16866
Publication Date(Web):11 Sep 2015
DOI:10.1039/C5NR04557F
The design of porous bimetallic nanocrystals (NCs) is very important for electrochemical energy conversion. Herein, we report an aqueous solution method for one-step fabrication of porous PtCu NCs assembled by spatially interconnected arms in high yield by a simple ultrasonic treatment of the reaction mixture at room temperature. The proposed method, without the need for multi-step synthesis, high temperatures, and organic solvents, shows an obvious advantage of simplicity for the feasible synthesis of bimetallic PtCu NCs with a porous structure. The as-made porous PtCu NCs are highly active and durable catalysts for the methanol oxidation reaction due to their porous structure and bimetallic composition.
Co-reporter:Kamel Eid, Victor Malgras, Pei He, Kunmiao Wang, Ali Aldalbahi, Saad M. Alshehri, Yusuke Yamauchi and Liang Wang
RSC Advances 2015 vol. 5(Issue 39) pp:31147-31152
Publication Date(Web):18 Mar 2015
DOI:10.1039/C5RA01981H
Precise control over composition and structure is highly important for designing highly active nanostructured electrocatalysts. Herein, we report a one-step strategy to directly synthesize trimetallic Pt–Pd–Ru nanodendrites in an aqueous solution at room temperature. These newly designed nanodendrites exhibit superior catalytic activities for both methanol oxidation reaction (MOR) and oxygen reduction reaction (ORR) in comparison with bimetallic Pt–Pd nanoflowers and commercially available Pt/C catalysts.
Co-reporter:Kamel Eid
The Journal of Physical Chemistry C 2015 Volume 119(Issue 34) pp:19947-19953
Publication Date(Web):August 5, 2015
DOI:10.1021/acs.jpcc.5b05867
Control over composition and structure on the nanoscale level is critical for designing highly active and durable catalyst to implement in electrochemical energy conversion. Herein, we report a facile strategy for an efficient synthesis of trimetallic PtPdRu dendritic nanocages with hollow cavity and porous dendritic shell by eroding the interior of the starting PtPdRu nanodendrites in acidic solution. The newly discovered trimetallic dendritic nanocages with an open-framework surface afford 3D molecular accessibility and can be used as highly active and durable catalysts for oxygen reduction reaction due to the synergetic effect derived from their unique porous structure and multimetallic composition.
Co-reporter:Hongjing Wang;Masataka Imura
Journal of Inorganic and Organometallic Polymers and Materials 2015 Volume 25( Issue 2) pp:245-250
Publication Date(Web):2015 March
DOI:10.1007/s10904-014-0133-x
Dendritic platinum nanoparticles (DPNs) with high surface area have attractive electrocatalytic properties. We report an aqueous solution phase synthesis of DPNs in the presence of various amphiphilic molecules (including surfactants) bypassing the use of organic solvents, seeds, templates or other additives and benefiting from low temperatures and short reaction time (Wang in J Am Chem Soc 132: 13636, 2010; Wang in J Am Chem Soc 133: 9674, 2011; Wang in J Am Chem Soc 135: 16762, 2013). Here we extend this concept to develop an economical and effective solution phase synthesis of DPNs by a simple one-step method with the assistance of polyoxyethylene nonylphenyl ether. The developed strategy remarkably simplifies the synthetic procedures compared to the reported ones. The obtained DPNs exhibit enhanced catalytic activity during methanol oxidation reaction in comparison with the commercially available platinum black.
Co-reporter:Xueqing Yu, Yufan Zhang, Liping Guo and Liang Wang
Nanoscale 2014 vol. 6(Issue 9) pp:4806-4811
Publication Date(Web):04 Feb 2014
DOI:10.1039/C4NR00180J
Macroporous carbon (MPC) with high pore accessibility and electrical conductivity is of great interest to the electrochemical platform. The development of a simple and efficient route for the direct synthesis of dendritic platinum nanoparticle (DPN) decorated MPC (DPN/MPC) is an interesting challenge, which is highly valuable for electrocatalytic applications. In this study, we propose a very simple route for the one-step synthesis of DPN/MPC in aqueous solution at room temperature without the need for any kind of seed and surfactant to direct the dendritic growth of Pt nanoparticles, which is performed by simply mixing an aqueous solution of K2PtCl4 with MPC and formic acid. The as-prepared DPN/MPC shows high electrocatalytic activities toward the oxidation of methanol and glucose.
Co-reporter:Xueqing Yu;Huan Wang; Liping Guo; Liang Wang
Chemistry – An Asian Journal 2014 Volume 9( Issue 11) pp:3221-3227
Publication Date(Web):
DOI:10.1002/asia.201402883
Abstract
The morphology- and size-controlled synthesis of branched Pt nanostructures on graphene is highly favorable for enhancing the electrocatalytic activity and stability of Pt. Herein, a facile approach is developed for the efficient synthesis of well-dispersed Pt nanoflowers (PtNFs) on the surface of polydopamine (PDA)-modified reduced graphene oxide (PDRGO), denoted as PtNFs/PDRGO, in high yield. The synthesis was performed by a simple heating treatment of an aqueous solution that contained K2PtCl4 and PDA-modified graphene oxide (GO) without the need for any additional reducing agent, seed, surfactant, or organic solvent. The coated PDA serves not only as a reducing agent, but also as cross-linker to anchor and stabilize PtNFs on the PDRGO support. The as-prepared PtNFs/PDRGO hybrid, with spatially and locally separated PtNFs on PDRGO, exhibits superior electrocatalytic activity and stability toward both methanol oxidation reaction (MOR) and oxygen reduction reaction (ORR) in alkaline solutions.
