Novel Pd–Cr electrocatalyst with low Pd content for coal electrolysis for hydrogen production

Yu, Ping; Jiang, Hao; Ren, Peng; Ma, Hongze; Zheng, Ruheng; Zhang, Jin Z.; Botte, Gerardine G.

doi:10.1016/j.jpowsour.2020.229175

Cited by 14 publications

(10 citation statements)

References 47 publications

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“…Besides, by the calcination process (temperature and time) the shape of the particles transforms from a triangle and square shape to a spherical shape. Ping et al, [19] have prepared the PdCr catalysts in different atomic ratios on coal surfaces for hydrogen production. It was reported that a smaller particle size of Pd (4.66 nm) formed by the reduction of PdCr on carbon substrate [29].…”

Section: Resultsmentioning

confidence: 99%

“…To overcome these difficulties the Pd-based binary alloys could be used as alternative metal. There are many studies about using the Pdbased materials nanocatalysts for the ORR [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. To address this concern, the Pd nanoparticles with numerous morphologies such as icosahedron, sphere, spindle, cube, and rod are efficiently promoted for the Suzuki coupling reaction as well as the reduction of Cr(VI) [8].…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the alloying of Pd with other metals such as Cr, V, Fe, Co, and Ni increased the catalytic activity [15][16][17]. Amongst these transition metals, the alloying of Ni and Cr leads to the formation of the stronger metallic bond with Pd and hence a greater enhancement in the catalytic activity [18,19]. The Cr element is one of the most elements that show advantage when incorporated to Pd to form Pd-Cr alloy as it enhances the activity and stability of unary Pd [19].…”

Section: Introductionmentioning

confidence: 99%

“…Amongst these transition metals, the alloying of Ni and Cr leads to the formation of the stronger metallic bond with Pd and hence a greater enhancement in the catalytic activity [18,19]. The Cr element is one of the most elements that show advantage when incorporated to Pd to form Pd-Cr alloy as it enhances the activity and stability of unary Pd [19]. Furthermore, the alloying of Cr and Pd improved the tolerance of Pd to poisoning due to the oxophilicity of Cr [20].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Synthesis and Thermal Treatment of Pd-Cr@Carbon for Efficient Oxygen Reduction Reaction in Proton-Exchange Membrane Fuel Cells

Mebed

Zeid

Abd‐Elnaiem

2021

J Inorg Organomet Polym

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A nanostructured PdCr@carbon catalyst is deposited on a supported carbon surface using the modified polyol reduction method for the oxygen reduction reaction (ORR) for the application in the proton exchange membrane fuel cell. The crystal structure and feature nanostructure of the PdCr@carbon were established using the XRD and TEM, while their catalytic activity was studied using the cyclic voltammetry and electrochemical polarization techniques. The estimated average crystallite size of PdCr is increased with the calcination temperature from 9.66 to 37.54 nm as the calcination temperature increased to 973 K, while the annealing time slightly affects the crystallite size. The TEM examination reveals the uniform distribution of the PdCr nanoparticles upon the carbon surface. The calcination temperature and time play an important factor in controlling the structural and morphology parameters of PdCr@carbon and the optimum activity and chemical stability were observed for samples calcined at 573 K for 3 h.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Synthesis and Thermal Treatment of Pd-Cr@Carbon for Efficient Oxygen Reduction Reaction in Proton-Exchange Membrane Fuel Cells

Mebed

Zeid

Abd‐Elnaiem

2021

J Inorg Organomet Polym

View full text Add to dashboard Cite

show abstract

“…In terms of energy consumption, the electrolysis of coal is preferred to water electrolysis; this is because 56.7 kcal of electrical energy and a reversible potential of 1.23 V are required to produce 1 mol of hydrogen in water electrolysis, whereas coal electrolysis only requires 9.5 kcal and 0.21 V, respectively. , This is achieved because the oxygen evolution reaction, which has high overpotential, is replaced with coal oxidation at the anode . Despite this advantage, the production of hydrogen through the electrolysis of coal slurry is retarded by poor reaction kinetics, low current density, and low degradation degree of coal. , This makes the process uneconomical and the technology unavailable for commercialization.…”

Section: Introductionmentioning

confidence: 99%

A Novel Chemical–Electrochemical Hydrogen Production from Coal Slurry by a Two-Step Process: Oxidation of Coal by Ferric Ions and Electroreduction of Hydrogen Ions

Olukayode

Yang²,

Kang

et al. 2022

ACS Omega

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Hydrogen production from the electrolysis of coal slurry is a promising approach under the condition of low voltage (0.8–1.2 V) and medium temperature. However, the rate of hydrogen production is slugged by poor anode kinetics, under an electrochemical condition that results from the collision of the coal particles with the anode surface. This paper reports a novel process that consists of two steps: the oxidation of the coal slurry by ferric ions(III) in a hydrothermal reactor at a temperature of 120–160 °C and the electro-oxidation of ferric ions(II) in the electrochemical cell to produce hydrogen. This technique circumvents the technical issues experienced in the conventional coal slurry electrolysis process by adopting a two-step process consisting of solid–liquid reactions instead of solid–solid reactions. This indirect oxidation process produced a current density of 120 mA/cm2 at room temperature and a voltage of 1 V, which is higher than the values reported in the conventional processes. An investigation of the oxidation mechanism was carried out via scanning electron microscopy, Fourier-transform infrared spectroscopy and elemental analysis. The results obtained showed that the oxidation of coal by ferric ions occurs from the surface to the inner parts of the coal particles in a stepwise manner. It was also revealed that the ferric ions in the media increased the active interfaces both of the coal particles and of the anode electrode. This explains the high hydrogen production rate obtained from this process. This novel discovery can pave the way for the commercialization of coal slurry electrolysis.

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Exploring the Impact of Ni Doping on Bagasse Biochar and Its Efficient Hydrogen Production via Assisted Water Electrolysis

et al. 2023

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Heteroatom doping in carbon matrices has been widely used to prepare efficient carbonaceous electrocatalysts. Biochar‐assisted water electrolysis (BAWE) is a promising hydrogen production method that can efficiently utilize waste biomass. However, it is often limited by the slow anode biochar oxidation reaction (BOR). In addition, pure biochar typically lacks enough active catalytic sites; hence, its electrochemical reactivity is unsatisfactory. Herein, Ni is doped into bagasse biochar to improve its BOR. Its electrochemical properties and hydrogen production performance are measured using linear sweep voltammetry, electrochemical impedance spectroscopy, and chronopotentiometry. The reaction characteristics of the bagasse biochar are analyzed. The impact of its physiochemical properties on its oxidation process is discussed. Compared to the undoped biochar, the Ni‐doped biochar shows a larger specific surface area, a higher degree of graphitization, and stronger biochar oxidation reactivity (including a lower onset potential and larger electric current density), which significantly increase the electric current density and hydrogen production. This study provides a beneficial strategy for improving BAWE.

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Novel Pd–Cr electrocatalyst with low Pd content for coal electrolysis for hydrogen production

Cited by 14 publications

References 47 publications

Synthesis and Thermal Treatment of Pd-Cr@Carbon for Efficient Oxygen Reduction Reaction in Proton-Exchange Membrane Fuel Cells

Synthesis and Thermal Treatment of Pd-Cr@Carbon for Efficient Oxygen Reduction Reaction in Proton-Exchange Membrane Fuel Cells

A Novel Chemical–Electrochemical Hydrogen Production from Coal Slurry by a Two-Step Process: Oxidation of Coal by Ferric Ions and Electroreduction of Hydrogen Ions

Exploring the Impact of Ni Doping on Bagasse Biochar and Its Efficient Hydrogen Production via Assisted Water Electrolysis

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