Preparation of FePd‐RGO Bimetallic Composites with High Catalytic Activity for Formic Acid Electro‐Oxidation

Abstract

FePd-RGO composites through the growth of uniformly dispersed iron-palladium bimetallic nanoparticles (NPs) on reduced graphene oxide (RGO) nanosheets were prepared by a two-step method. The firstly formed Fe is used as the seed for the subsequent Pd growth. The formation of Fe NPs on RGO in the first step is performed by an in-situ reduction reaction with the reducer ethylene glycol under oil bath at 180 ℃. NPs in the as-prepared FePd-RGO have an average particle size of 6.5 nm, and Pd is added to one side of Fe which leads to the formation of Fe-Pd bimetallic interfaces. As compared with the commercial Pd black at the same loading, the composites have higher electro-catalytic activity, better electrochemical stability and higher resistance to CO poisoning for formic acid electro-oxidation. Figure 1 (a) TEM image of Fe-RGO; (b) TEM image of FePd-RGO with the corresponding local magnified image, and (c) HRTEM image of (b). Insets (a) and (c) are the corresponding SAED patterns, respectively. Preparation of FePd-RGO Bimetallic Composites with High Catalytic Activity Chin.

Facile Synthesis of Pd‐Ni Nanoparticles on Reduced Graphene Oxide under Microwave Irradiation for Formic Acid Oxidation

“…So the large current peak at about 0.16 V and the small peak at about 0.56 V can correspond to formic acid oxidation via the direct pathway of Equation (1) and the CO pathway of Equation (2), respectively. [11,12,36] For all the electrodes, the peak at about 0.16 V is much larger than that at about 0.56 V, indicating that the formic acid oxidation at the as-prepared catalysts is mainly through the direct pathway.…”

“…Recently, direct formic acid fuel cell (DFAFC) is considered as a promising clean power conversion device for small portable and mobile applications and has attracted growing attention because of high specific energy at low operating temperatures. [1][2][3] It is generally accepted that the electro-oxidation of formic acid follows the mechanism of dual pathway in acidic electrolyte: the direct pathway (HCOOH → COOH ads / HCOO ads ＋H ＋ ＋e  → CO 2 ＋2H ＋ ＋2e  ) and the indirect pathway (HCOOH → CO ads ＋H 2 O → CO 2 ＋2H ＋ ＋2e -). [2][3][4][5][6] Both Pt and Pd have been studied as effective catalysts for the electro-oxidation of formic acid in DFAFC.…”

“…However, the poor durability/stability of conventional Pd catalysts must be further improved due to the accumulation of poison intermediates on Pd particles and the aggregation and sintering of catalysts during the electro-oxidation of formic acid. [1,[7][8][9] Therefore, tremendous efforts have been made to improve the stability of Pd catalysts by alloying or modifying Pd with other metal such as Ag, Pt, Cu, Zn, Ni, and Pb. [3][4][5][9][10][11][12][13] To enhance the catalytic performance of Pd and minimize its use simultaneously, the other strategy is to explore novel and excellent supporting materials to disperse Pd-based particles effectively.…”

Miniaturized Biamperometric Detectors for Electrochemical Detection in Flowing Streams

“…Biamperometry can be applied as detection technique using two polarizable electrodes when i) both reduction and oxidation form of the redox pair are present in the solution , or ii) there are two irreversible and independent redox reactions that have opposite electrode processes . Low or even zero potential difference is set between the electrodes to measure current response with desired selectivity and low contribution of background currents.…”

Sonochemical Synthesis of Two Dimensional C3N4 Nanosheets Supported Palladium Composites and Their Electrocatalytic Activity for Oxygen Reduction and Methanol Oxidation Reaction

“…However, the cost of palladium is lower than that of platinum and it is at least fifty times more abundant on the earth than Pt, as a result, it could be a good substitute for Pt as the catalyst in fuel cells. [9][10][11] Because catalysis is a surface effect, the catalyst needed to have surface area as high as possible. 2D nanosheets as emerging nanomaterials exhibit unique properties that originate from their atomically thin layer, high surface area and specific physicochemical properties.…”