Enhanced formic acid electrooxidation reaction enabled by 3D PtCo nanodendrites electrocatalyst

Zhai, Chunyang; Zhang, Hongmin; Hu, Jiayue; Zeng, Lixi; Xue, Mianqiang; Du, Yukou; Zhu, Mingshan

doi:10.1016/j.jallcom.2018.09.357

Cited by 30 publications

(11 citation statements)

References 48 publications

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“…Pd, Pb, Ru, Sn, Ni etc. ), M-core@Pt-shell nanostructures, [16][17][18][19] nanorods, 20,21 starlike nanocrystal, 22 nanowires, 23,24 nano-dendrites, 25,26 nanoframes, 27,28 nano-cages, 29 nano-sheets 30 or building a defect rich nano-structure (edges, corners, steps, low coordinate atoms). 31 In addition, recent studies have demonstrated that catalyst support is also a key player for determining the catalytic properties and signicant improvements in performance have been shown by changing the catalyst support (e.g.…”

Section: Introductionmentioning

confidence: 99%

Promoting formic acid oxidation performance of Pd nanoparticles via Pt and Ru atom mediated surface engineering

et al. 2020

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Section: Introductionmentioning

confidence: 99%

Promoting formic acid oxidation performance of Pd nanoparticles via Pt and Ru atom mediated surface engineering

et al. 2020

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“…Fuel cells generate electricity through electrochemical reactions in which the reactant in the form of fuel reacts at the anode and oxidant converted at the cathode [1]. The advantages of fuel cells compared with batteries are longer operating times, wider temperature range, reduced environmental issues associated with disposal, the capability to work on different fuels, and instantaneous recharging capability [2,3].…”

Section: Introductionmentioning

confidence: 99%

“…The electrode and cell reactions in the formic acid fuel cell occur as follows. The formation of CO intermediates in equation (1) can cause poisoning on the catalyst surface, which will disrupt the oxidation at equation (2). Thus, the ideal oxidation pathway is the direct pathway to increase overall cell efficiency [15].…”

Section: Introductionmentioning

confidence: 99%

“…Bimetallic catalysts have been extensively studied for DFAFC to solve the poisoning and stability problems in Pt and Pd catalysts. The addition of a second metal in Pt-and Pd-based catalysts, such as Ir [8], Zn [5,16,17], Co [2,14], Sn [18,19], and V [20] at a suitable ratio, can increase the electrochemical performance toward formic acid oxidation compared with Pt and Pd monometallic catalysts. Zhang et al [19] found that the addition of Sn could modify Pd catalyst by electronic effect.…”

Section: Introductionmentioning

confidence: 99%

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Improving the electrocatalytic activity for formic acid oxidation of bimetallic Ir–Zn nanoparticles decorated on graphene nanoplatelets

Azam

Isahak

Zainoodin

et al. 2020

Mater. Res. Express

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A graphene nanoplatelet (GNP)-supported Ir-Zn catalyst (Ir-Zn/GNP) was fabricated by H 2 reduction to discover an alternative for non-platinum and non-palladium catalysts as an anode catalyst in direct formic acid fuel cell (DFAFC). The obtained Ir-Zn/GNP catalyst with ratio of Ir: Zn=50:50 (Ir 50 Zn 50 /GNP) exhibited better electrocatalytic activity than GNP-supported iridium catalyst (Ir/GNP) for formic acid oxidation. Although the oxidation peak current density of Ir50Zn50/GNP was slightly lower than that of Ir/GNP, the oxidation peak potential shifted more negatively (193 mV) than Ir/GNP with higher value of the ratio of forward scan to reverse the scan peak current (If/Ib). The presence of Zn also enhanced the power density and current generation with increased performance stability in a passive DFAFC cell tests. The improvement of the electrochemical performance was ascribed to the ensemble effect where the addition of Zn could modify the Ir atom arrangement, thereby promoting the oxidation through dehydrogenation pathway. However, extremely high Zn content would inhibit oxidation capability because Zn atoms might reduce the Ir catalytic sites. A new alternative for non-Pt and non-Pd anode catalysts for DFAFC applications was successfully achieved.

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“…Nevertheless, monometallic Pd should be modified due to CO adsorption on Pd surface coming from CO 2 reduction . Many bimetallic and trimetallic anode catalysts have been investigated in the literature for FAEO. In most of these studies, better performance of multi‐metallic catalysts than monometallic catalysts for FAEO was reported .…”

Section: Introductionmentioning

confidence: 99%

Towards more active and stable PdAgCr electrocatalysts for formic acid electrooxidation: The role of optimization via response surface methodology

et al. 2019

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In this study, multiwall carbon nanotube (MCNT)-supported Pd (Pd/MWCNT) catalysts are prepared by using NaBH 4 reduction method. In order to maximize the oxidation and reduction of H 2 SO 4 , synthesis conditions (Pd ratio, molar ratio of NaBH 4 /K 2 PdCl 4 , volume of deionized water, and duration of agitation) are optimized by using response surface methodology (RSM). The optimum synthesis conditions are determined as 58.2% of Pd by weight, 154.6 molar ratio of NaBH 4 to K 2 PdCl 4 , 19.48 mL of deionized water, and 186.16 min of agitation duration. The effect of electrochemical measurement conditions on the oxidation kinetics of Pd/MWCNT is also investigated by RSM. The optimum electrochemical measurement conditions are found as 10 μL of catalyst mixture, 90°C of H 2 SO 4 solution, and 5.5 M H 2 SO 4 . The Pd/MWCNT, Pd 50 Ag 50 /MWCNT, and Pd 65.6 Ag 33.6 Cr 0.80 /MWCNT catalysts prepared under optimized conditions are characterized by using X-ray diffraction, transmission electron microscopy, N 2 adsorption-desorption, and inductively coupled plasma mass spectrometry. The crystallite sizes of these catalysts are found as 4.85, 5.66, and 5.26 nm for Pd/MWCNT, Pd 50 Ag 50 /MWCNT, and Pd 65.6 Ag 33.6 Cr 0.80 /MWCNT catalysts, respectively. Isotherms of all these catalysts are found to be similar to Type V isotherms with H3 hysteresis loop. The average particle size of Pd 50 Ag 50 / MWCNT and Pd 65.6 Ag 33.6 Cr 0.80 /MWCNT catalysts are determined as 5.2 and 9.2 nm, respectively. Electrochemical performance of as-prepared catalysts is evaluated by using cyclic voltammetry and chronoamperometry. The formic acid electrooxidation (FAEO) activities are found as 18.9, 27.8, and 51.6 mA/cm 2 for Pd/MWCNT, Pd 50 Ag 50 /MWCNT, and Pd 65.6 Ag 33.6 Cr 0.80 /MWCNT, respectively. Pd 65.6 Ag 33.6 Cr 0.80 /MWCNT shows the highest activity and stability. Optimization of synthesis conditions and electrochemical measurement parameters allow us to obtain very good electrochemical activity and stability for FAEO reaction compared with anode catalysts in the literature.

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Enhanced formic acid electrooxidation reaction enabled by 3D PtCo nanodendrites electrocatalyst

Cited by 30 publications

References 48 publications

Promoting formic acid oxidation performance of Pd nanoparticles via Pt and Ru atom mediated surface engineering

Promoting formic acid oxidation performance of Pd nanoparticles via Pt and Ru atom mediated surface engineering

Improving the electrocatalytic activity for formic acid oxidation of bimetallic Ir–Zn nanoparticles decorated on graphene nanoplatelets

Towards more active and stable PdAgCr electrocatalysts for formic acid electrooxidation: The role of optimization via response surface methodology

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