High Pt-like activity of the Ni–Mo/graphene catalyst for hydrogen evolution from hydrolysis of ammonia borane

Yao, Qilu; Lu, Zhang‐Hui; Huang, Wei; Chen, Xiangshu; Zhu, Jia

doi:10.1039/c6ta02004f

Cited by 242 publications

(100 citation statements)

References 54 publications

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“…44,55,64 Therefore, in the case of the AB hydrolysis, the better dispersion of the cobalt oxide species active sites achieved in the Ru-Co/C bimetallic samples with respect to the monometallic Co/C does not provide any significant improvement in the catalytic activity, pointing out that Ru sites are much more important than Co ones in addressing the AB hydrolysis activity of bimetallic Ru-Co/C catalysts. 65 It can be then supposed that the different relative reactivity of Co and Ru towards the SB and AB hydrolysis can account for the different behavior of the bimetallic Ru-Co/C catalysts in the above reactions. Such results well agree with kinetic data reported in Table 2 for AB hydrolysis, indicating much lower values of Ea of monometallic Ru samples (30-35 kJ/mol) as compared to monometallic Co (57 kJ/mol).…”

Section: Discussionmentioning

confidence: 99%

Carbon supported bimetallic Ru-Co catalysts for H₂ production through NaBH₄ and NH₃ BH₃ hydrolysis

2017

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Summary This work investigates the effect of the addition of small amounts of Ru (0.5‐1 wt%) to carbon supported Co (10 wt%) catalysts towards both NaBH4 and NH3BH3 hydrolysis for H2 production. In the sodium borohydride hydrolysis, the activity of Ru‐Co/carbon catalysts was sensibly higher than the sum of the activities of corresponding monometallic samples, whereas for the ammonia borane hydrolysis, the positive effect of Ru‐Co systems with regard to catalytic activity was less evident. The performances of Ru‐Co bimetallic catalysts correlated with the occurrence of an interaction between Ru and Co species resulting in the formation of smaller ruthenium and cobalt oxide particles with a more homogeneous dispersion on the carbon support. It was proposed that Ru°, formed during the reduction step of the Ru‐Co catalysts, favors the H2 activation, thus enhancing the reduction degree of the cobalt precursor and the number of Co nucleation centers. A subsequent reduction of cobalt and ruthenium species also occurs in the hydride reaction medium, and therefore the state of the catalyst before the catalytic experiment determines the state of the active phase formed in situ. The different relative reactivity of the Ru and Co active species towards the two investigated reactions accounted for the different behavior towards NaBH4 and NH3BH3 hydrolysis.

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Section: Discussionmentioning

confidence: 99%

Carbon supported bimetallic Ru-Co catalysts for H₂ production through NaBH₄ and NH₃ BH₃ hydrolysis

2017

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“…[44][45][46][47][48][49] The corresponding satellite peaks are located at the higher binding energies . [50][51][52][53][54][55][56] The oxidation states of Ni and Mo are commonly observed in the XPS spectra because of oxidization in air. [50][51][52][53][54][55][56] The oxidation states of Ni and Mo are commonly observed in the XPS spectra because of oxidization in air.…”

Section: Sem Xrd Xps and Tem Characterizationmentioning

confidence: 99%

Network‐Like Ni_1−xMo_x Nanosheets: Multi‐Functional Electrodes for Overall Water Splitting and Supercapacitor

et al. 2019

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Exploring efficient, abundant, cheap and stable materials for the electrolysis of water and supercapacitor is a challenging task. Here, Ni 1À x Mo x nanosheets are obtained on carbon cloth (CC), which can be multi-functional electrodes for electrochemical applications. Impressively, we find that the electrochemical abilities can be optimized by constructing network-like nanosheets and tuning the ratio of Ni and Mo in the alloy. To acquire a current density of 10 mA cm À 2 (j 10 ), Ni 0.75 Mo 0.25 /CC shows the lowest overpotentials (79 mV for hydrogen evolution reaction (HER) and 330 mV for oxygen evolution reaction (OER)) in 1 M KOH. Using Ni 0.75 Mo 0.25 /CC as both positive and negative poles, the cell only requires a potential of 1.74 V to reach j 10 and shows long-term durability. We further show that Ni 0.75 Mo 0.25 electrode exhibits a superior specific capacitance (422 F g À 1 at 1 A g À 1 ) and high capacitance retention (108.2 % after 1000 cycles) in 1 M KOH. The super-electrochemical performances of Ni 0.75 Mo 0.25 /CC is attributed to its high electronic conductivity, rich active sites, and large surface area. We believe that the Ni 0.75 Mo 0.25 /CC electrode with extraordinary electrochemical performances is a hopeful material for practical applications in both electrocatalysis and supercapacitors (SC).

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“…In general, the catalytic activity of metal NPs is closely relevant to their sizes: a small size typically corresponds to enhanced catalytic activity of the metal NPs. However, nanosized metal NPs often suffer from serious aggregation because of the increased surface energy of the particles, which thus leads to a momentous decrease in their catalytic activity, lifetime, and efficiency . Therefore, it remains a major challenge to improve the catalytic activity and stability of metal NPs.…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis of Platinum–Cerium(IV) Oxide Hybrids Arched on Reduced Graphene Oxide Catalyst in Reverse Micelles with High Activity and Durability for Hydrolysis of Ammonia Borane

Yao

Shi

Zhang

et al. 2016

Chemistry An Asian Journal

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Highly dispersed Pt-CeO hybrids arched on reduced graphene oxide (Pt-CeO /rGO) were facilely synthesized by a combination of the reverse micelle technique and a redox reaction without any additional reductant or surfactant. Under a N atmosphere, the redox reaction between Ce and Pt occurs automatically in alkaline solution, which results in the formation of Pt-CeO /rGO nanocomposites (NCs). The as-synthesized Pt-CeO /rGO NCs exhibit superior catalytic performance relative to that shown by the free Pt nanoparticles, Pt/rGO, Pt-CeO hybrid, and the physical mixture of Pt-CeO and rGO; furthermore, the nanocomposites show significantly better activity than the commercial Pt/C catalyst toward the hydrolysis of ammonia borane (NH BH ) at room temperature. Moreover, the Pt-CeO /rGO NCs have remarkable stability, and 92 % of their initial catalytic activity is preserved even after 10 runs. The excellent activity of the Pt-CeO /rGO NCs can be attributed not only to the synergistic structure but also to the electronic effects of the Pt-CeO /rGO NCs among Pt, CeO , and rGO.

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High Pt-like activity of the Ni–Mo/graphene catalyst for hydrogen evolution from hydrolysis of ammonia borane

Abstract: Ni nanocatalysts modified with a Mo dopant and a graphene support have been used as a low cost catalyst with Pt-like activity and robust durability for hydrogen evolution from the hydrolysis of ammonia borane under ambient atmosphere at room temperature.

Cited by 242 publications

References 54 publications

Carbon supported bimetallic Ru-Co catalysts for H₂ production through NaBH₄ and NH₃ BH₃ hydrolysis

Carbon supported bimetallic Ru-Co catalysts for H₂ production through NaBH₄ and NH₃ BH₃ hydrolysis

Network‐Like Ni_1−xMo_x Nanosheets: Multi‐Functional Electrodes for Overall Water Splitting and Supercapacitor

Facile Synthesis of Platinum–Cerium(IV) Oxide Hybrids Arched on Reduced Graphene Oxide Catalyst in Reverse Micelles with High Activity and Durability for Hydrolysis of Ammonia Borane

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High Pt-like activity of the Ni–Mo/graphene catalyst for hydrogen evolution from hydrolysis of ammonia borane

Abstract: Ni nanocatalysts modified with a Mo dopant and a graphene support have been used as a low cost catalyst with Pt-like activity and robust durability for hydrogen evolution from the hydrolysis of ammonia borane under ambient atmosphere at room temperature.

Cited by 242 publications

References 54 publications

Carbon supported bimetallic Ru-Co catalysts for H2 production through NaBH4 and NH3 BH3 hydrolysis

Carbon supported bimetallic Ru-Co catalysts for H2 production through NaBH4 and NH3 BH3 hydrolysis

Network‐Like Ni1−xMox Nanosheets: Multi‐Functional Electrodes for Overall Water Splitting and Supercapacitor

Facile Synthesis of Platinum–Cerium(IV) Oxide Hybrids Arched on Reduced Graphene Oxide Catalyst in Reverse Micelles with High Activity and Durability for Hydrolysis of Ammonia Borane

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Carbon supported bimetallic Ru-Co catalysts for H₂ production through NaBH₄ and NH₃ BH₃ hydrolysis

Carbon supported bimetallic Ru-Co catalysts for H₂ production through NaBH₄ and NH₃ BH₃ hydrolysis

Network‐Like Ni_1−xMo_x Nanosheets: Multi‐Functional Electrodes for Overall Water Splitting and Supercapacitor