Insight into the electrochemical activation of carbon-based cathodes for hydrogen evolution reaction

Dong, Guofa; Fang, Ming; Wang, Hongtao; Yip, SenPo; Cheung, Ho Yuen; Wang, Fengyun; Wong, Chun Yuen; Chu, Sai T.; Ho, Johnny C.

doi:10.1039/c5ta02551f

Cited by 207 publications

(124 citation statements)

References 41 publications

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“…[44][45][46] Our results suggest that such activation is possible in alkaline solutionsa sw ell. As shown by Cui et al [44] and Das et al, [45] the electrochemical activation of CNTsduring potentio-dynamic cycling in acidic solutions arises only from the change of material properties.…”

mentioning

confidence: 79%

Molybdenum Carbide Nanoparticles on Carbon Nanotubes and Carbon Xerogel: Low‐Cost Cathodes for Hydrogen Production by Alkaline Water Electrolysis

et al. 2016

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Low-cost molybdenum carbide (Mo2 C) nanoparticles supported on carbon nanotubes (CNTs) and on carbon xerogel (CXG) were prepared and their activity for the hydrogen evolution reaction (HER) was evaluated in 8 m KOH aqueous electrolyte at 25-85 °C. Measurements of the HER by linear scan voltammetry allowed us to determine Tafel slopes of 71 and 74 mV dec(-1) at 25 °C for Mo2 C/CNT and Mo2 C/CXG, respectively. Stability tests were also performed, which showed the steady performance of the two electrocatalysts. Moreover, the HER kinetics at Mo2 C/CNT was enhanced significantly after the long-term stability tests. The specific activity of both materials was high, and a higher stability was obtained for the activated Mo2 C/CNT (40 A g(-1) at -0.40 V vs. the reversible hydrogen electrode).

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mentioning

confidence: 79%

Molybdenum Carbide Nanoparticles on Carbon Nanotubes and Carbon Xerogel: Low‐Cost Cathodes for Hydrogen Production by Alkaline Water Electrolysis

et al. 2016

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“…Nowadays, the main methods to produce hydrogen include steam methane reforming as well as coal gasification, which are both low‐efficiency and releasing CO 2 , causing environmental pollution . Instead, the electrolysis of water is considered as an ideal process to produce hydrogen, which is environmentally friendly and highly pure . To achieve more effective hydrogen evolution reaction (HER), electrocatalysts are utilized to obtain high efficiency and lower the overpotential .…”

Section: Methodsmentioning

confidence: 99%

“…[3,4] Instead, the electrolysis of water is considered as an ideal process to produce hydrogen, which is environmentally friendly and highly pure. [5,6] To achieve more effective hydrogen evolution reaction (HER), electrocatalysts are utilized to obtain high efficiency and lower the overpotential. [7][8][9] Up to now, Pt-based materials are still the most effective catalysts for HER, with nearly zero overpotential.…”

mentioning

confidence: 99%

Nitrogen and Sulfur Co‐Doped Mesoporous Carbon Embedded with Co₉S₈ Nanoparticles: Efficient Electrocatalysts for Hydrogen Evolution

Tang

Huang

et al. 2019

ChemPlusChem

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Co9S8 embedded, N,S co‐doepd mesoporous carbon materials were synthesized by adopting CoCl2 as the molten salt. In details, CoCl2 and glucose were used as cobalt and carbon precursors, respectively, and thiourea was utilized as sulfur and nitrogen precursors. This synthetic process involved three steps, including hand‐milling, carbonation, and acid leaching. The results of characterization exhibited that the final products had mesoporous structures, which also showed high nitrogen and sulfur contents. Moreover, the Co9S8 nanoparticles dispersed evenly in the carbonaceous matrix. Furthermore, the calcining temperature could affect the porosities of the final products and the contents of the heteroatoms, which could further determine the electrocatalytic activities of these catalysts. When used as the electrocatalysts for hydrogen evolution reaction, the optimal catalyst, GTCo900, exhibited superior catalytic activities under acidic condition. The overpotential is 62 mV to afford a current density of 10 mA cm−2. Moreover, it could also reveal excellent stability for 12 h.

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“…When a Pt wire is used for activation, the electrochemical catalytic activity of the graphite W.E is greatly improved to the extent on commercial 20 wt.% Pt/C, but when a graphite rod is used, the W.E could not be activated effectively. The formation of Pt Nps on the cathode surface is the prime reason for the sharp increase in the HER catalytic performance resulting in a plethora of hydrogen evolution under activation with the Pt wire …”

Section: Introductionmentioning

confidence: 99%

Electrochemical Deposition of Platinum Nanoparticles on Reduced Graphene Oxide for Hydrogen Evolution from Acid Water

Kunhiraman

Manoharan

2016

ChemistrySelect

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Graphene is attracting a lot of researchers due to its diversified applications in various fields. However, till now there is no report about the usage of graphene as an electrocatalyst for catalyzing electrochemical Hydrogen Evolution Reaction (HER) in a water electrolyzer. Here, we demonstrate that chemically Reduced Graphene Oxide (rGO) exhibits hydrogen evolution activity close to that of 20 wt.% Pt/C in an acid electrolyte when it is subjected to electrochemical cycling in the potential window −180 to +420 mV vs. RHE. rGO exhibits an increase in the HER activity after cyclic voltammetry (CV) activation, provided Platinum (Pt) is used as the Counter Electrode (C.E). When pure graphite rod is employed as a C.E, unfortunately, the HER activity on rGO is negligible. When Pt is used as the C.E, Pt dissolves from the Pt C.E and subsequently deposites on the rGO material coated onto the Working Electrode (W.E). Transmission Electron Microscopy (TEM) analysis indicates that the deposited particles remain as Pt Nanoparticles (Nps) on the surface of the rGO material. Possibly, improved activity is achieved due to the presence of Pt Nps on the surface of the rGO material rather than the activation of the rGO material itself.

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Insight into the electrochemical activation of carbon-based cathodes for hydrogen evolution reaction

Abstract: The anodic Pt dissolution, although widely ignored, should be taken into consideration during electrochemical tests when Pt metal is utilized as the counter electrode.

Cited by 207 publications

References 41 publications

Molybdenum Carbide Nanoparticles on Carbon Nanotubes and Carbon Xerogel: Low‐Cost Cathodes for Hydrogen Production by Alkaline Water Electrolysis

Molybdenum Carbide Nanoparticles on Carbon Nanotubes and Carbon Xerogel: Low‐Cost Cathodes for Hydrogen Production by Alkaline Water Electrolysis

Nitrogen and Sulfur Co‐Doped Mesoporous Carbon Embedded with Co₉S₈ Nanoparticles: Efficient Electrocatalysts for Hydrogen Evolution

Electrochemical Deposition of Platinum Nanoparticles on Reduced Graphene Oxide for Hydrogen Evolution from Acid Water

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Insight into the electrochemical activation of carbon-based cathodes for hydrogen evolution reaction

Abstract: The anodic Pt dissolution, although widely ignored, should be taken into consideration during electrochemical tests when Pt metal is utilized as the counter electrode.

Cited by 207 publications

References 41 publications

Molybdenum Carbide Nanoparticles on Carbon Nanotubes and Carbon Xerogel: Low‐Cost Cathodes for Hydrogen Production by Alkaline Water Electrolysis

Molybdenum Carbide Nanoparticles on Carbon Nanotubes and Carbon Xerogel: Low‐Cost Cathodes for Hydrogen Production by Alkaline Water Electrolysis

Nitrogen and Sulfur Co‐Doped Mesoporous Carbon Embedded with Co9S8 Nanoparticles: Efficient Electrocatalysts for Hydrogen Evolution

Electrochemical Deposition of Platinum Nanoparticles on Reduced Graphene Oxide for Hydrogen Evolution from Acid Water

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Nitrogen and Sulfur Co‐Doped Mesoporous Carbon Embedded with Co₉S₈ Nanoparticles: Efficient Electrocatalysts for Hydrogen Evolution