Cobalt Oxide and Cobalt‐Graphitic Carbon Core–Shell Based Catalysts with Remarkably High Oxygen Reduction Reaction Activity

Yu, Jie; Chen, Gao; Sunarso, Jaka; Zhu, Yinlong; Ran, Ran; Zhu, Zhonghua; Zhou, Wei; Shao, Zongping

doi:10.1002/advs.201600060

Cited by 117 publications

(69 citation statements)

References 58 publications

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“…[19] Our previous report demonstrated that ethylenediaminetetraacetic acid (EDTA) can promote the encapsulation process of the core by graphitic carbon. [20] Thus, to furthera ssociate the thickness of the carbon shell with HER activity,E DTAw as added to the precursors,a nd the corresponding pyrolysis products, denoted Ru 0.25 Co 0.75 P@NPC-EDTA, exhibited poor HER activity relative to Ru 0.25 Co 0.75 P@NPC, which mayh ave resulted from the thick carbon coats that were revealed by HRTEM in Figure S19 (Sup-portingI nformation). At hick carbon shell may block the active metal sites, caused lesse lectron transport, and thus reduced the catalytic activity.…”

Section: Resultsmentioning

confidence: 99%

Multifold Nanostructuring and Atomic‐Scale Modulation of Cobalt Phosphide to Significantly Boost Hydrogen Production

Zhong

et al. 2018

Chemistry A European J

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Water electrolysis is regarded as a green and highly efficient approach to producing high-purity hydrogen, but commercialization of this technology still requires the development of high-performance and affordable electrocatalysts for the hydrogen evolution reaction (HER). Currently, because of its excellent electrical conductivity and good corrosion resistance in acidic media, cobalt phosphide (CoP) has become a representative non-noble-metal HER catalyst despite its inadequate catalytic activity. Herein, a strategy of multiple catalyst-structure engineering, which simultaneously includes doping, nanostructuring, and in situ nanocarbon coating, was employed to significantly improve the HER performance of CoP. CoP with optimized ruthenium doping and covered by ultrathin graphitic carbon shells shows remarkably high HER catalytic behaviour with a low overpotential of only 73 mV at a current density of 10 mA cm and a small Tafel slope of 46 mV dec , close to that of the Pt/C benchmark, while maintaining excellent durability. Moreover, the ultrathin graphene shell has a significant positive effect on catalytic activity. This work demonstrates the necessity and validity of multifold structural control, which can be widely used to design various materials for different catalytic processes.

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Section: Resultsmentioning

confidence: 99%

Multifold Nanostructuring and Atomic‐Scale Modulation of Cobalt Phosphide to Significantly Boost Hydrogen Production

Zhong

et al. 2018

Chemistry A European J

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“…All potentials were referred to the reversible hydrogen electrode (RHE) according to the following equation [Eq. (3)]:

true E (RHE) = E (Ag / AgCl (Sat . KCl) + 0.197 normalV + 0.059 pH

…”

Section: Discussionmentioning

confidence: 99%

Influence of the Composition and Preparation of the Rotating Disk Electrode on the Performance of Mesoporous Electrocatalysts in the Alkaline Oxygen Reduction Reaction

et al. 2017

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We report a systematic study of the influence of the composition and preparation method of the electrocatalyst layer deposited on the rotating (ring) disk electrodes (RDE/ RRDE) employed in the alkaline oxygen reduction reaction (ORR). To investigate and rationalize the generally underestimated role of these factors on the ORR performance of mesoporous electrocatalysts, we studied the activity and selectivity of nitrogen-doped ordered mesoporous carbon as a function of the loading of electrocatalyst and of binder, of the type of binder, and of the addition order of the components onto the electrode. The use of an anion-exchange polymer (Fumion FAA-3 ) as the binder instead of the commonly employed Nafion increased the selectivity towards H 2 O 2 and led to a lower kinetic current density. In addition, higher selectivity towards H 2 O was observed when increasing the loading of the catalyst and of the binder, although the latter resulted in a decreased kinetic current density. These results prove the crucial effect of the composition and preparation method of the layer deposited on the electrode on the ORR performance of the mesoporous electrocatalyst and can provide useful guidelines in view of the translation of the results of RDE studies to an alkaline fuel-cell setup.

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“…3a) was measured using the same ferro-ferricyanide oxidation-reduction system. Cobalt oxide Co 3 O 4 , as well-known material for its electrocatalytic activity [6,8,13,[33][34][35] in oxygen evolution reaction, was obtained during heat treatment of as-deposited Co(OH) 2 coatings at 673 K for 1 h. The lamellar structure and composition of tricobalt tetraoxide was confirmed in previous studies [23] by XRD, FTIR and XPS. In order to investigate the effect of temperature treatment to electroactive surface area, the same measurements as with Co(OH) 2 were performed (Fig.…”

Section: Determination Of Electroactive Surface Areamentioning

confidence: 53%

Electrocatalytic and pseudocapacitive properties of cobalt (hydro)oxide films on sintered metal fiber filter

Barauskienė

Valatka

2017

Mater Renew Sustain Energy

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Cobalt (hydro)oxide films on Bekipor ST 20AL3 sintered metal fiber were formed by electrochemical deposition under galvanostatic conditions using different electrolyte baths (nitrate, acetate and chloride). Cobalt oxide films were prepared via thermal treatment of as-deposited specimens at 673 K. Electroactive surface area of as-deposited and annealed films was estimated using oxidation-reduction system containing ferricyanide/ferrocyanide. Electrocatalytic and pseudocapacitive properties of the prepared films were investigated using 0.1 M NaOH aqueous solutions. The maximum specific capacitance of 1324 F g -1 was observed for a-Co(OH) 2 films electrodeposited from nitrate-containing electrolyte. Similarly, the highest electrocatalytic activity and stability in oxygen evolution reaction (OER) was determined to be characteristic for Co 3 O 4 films derived from nitrate bath.

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Cobalt Oxide and Cobalt‐Graphitic Carbon Core–Shell Based Catalysts with Remarkably High Oxygen Reduction Reaction Activity

Cited by 117 publications

References 58 publications

Multifold Nanostructuring and Atomic‐Scale Modulation of Cobalt Phosphide to Significantly Boost Hydrogen Production

Multifold Nanostructuring and Atomic‐Scale Modulation of Cobalt Phosphide to Significantly Boost Hydrogen Production

Influence of the Composition and Preparation of the Rotating Disk Electrode on the Performance of Mesoporous Electrocatalysts in the Alkaline Oxygen Reduction Reaction

Electrocatalytic and pseudocapacitive properties of cobalt (hydro)oxide films on sintered metal fiber filter

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