Construction of a cobalt-embedded nitrogen-doped carbon material with the desired porosity derived from the confined growth of MOFs within graphene aerogels as a superior catalyst towards HER and ORR

Zhu, Zhen; Yang, Yan; Guan, Yue; Xue, Juanhong; Cui, Lili

doi:10.1039/c6ta05196k

Cited by 87 publications

(45 citation statements)

References 38 publications

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“…MIL-101-NH 2 , [88] MIL-53, [89] MOF-100, [90] MOF-199, [91] MOF-74, [92] Ni-BTC, [87,93,94] and other Ni-, [95][96][97] Co-, [98][99][100][101] Mo-, [97] Al-based [102,103] monometallic and bimetallic MOFs are reported as precursors for the synthesis of various catalysts with specifically designed chemical components and structures. MIL-101-NH 2 , [88] MIL-53, [89] MOF-100, [90] MOF-199, [91] MOF-74, [92] Ni-BTC, [87,93,94] and other Ni-, [95][96][97] Co-, [98][99][100][101] Mo-, [97] Al-based [102,103] monometallic and bimetallic MOFs are reported as precursors for the synthesis of various catalysts with specifically designed chemical components and structures.…”

Section: Fundamentals and Characterizationsmentioning

confidence: 99%

Metal–Organic Framework Based Catalysts for Hydrogen Evolution

Zhu

Zou

2018

Advanced Energy Materials

366

199

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society is still heavily relying on chemical fuels. Therefore, the essential and realistic approaches to environmental and energy issues remain to be the exploration of clean and sustainable energy sources, in order to meet the ever-increasing energy demand. Thanks to its high energy density and environmental friendliness, hydrogen fuel comes into play as a muchanticipated new energy carrier, which is under intensive studies in the academic field. [4] Furthermore, we are already in the new era witnessing the transformation of hydrogen-powered technologies from science fictions to realities. UK is already in the process of replacing their traditional diesel-powered double decker buses with the hydrogen-powered version, which aims to phase out the former by 2018. [5] China announced its world's first hydrogen-powered tram, which was put into business service in the latter half of 2017. [6] Mercedes-Benz had even started its development of personal hydrogen-powered car, and Toyota had commercialized its hydrogen fuel-cell car branded "Mirai." [7,8] However, one critical issue remains to be the conflict between the hydrogen production efficiency and the demand for the mass distribution of hydrogen-powered technologies.Current industrial hydrogen production methods include coal gasification (followed by water-gas shift reaction), steam reforming, cryogenic distillation, and water splitting. [9] Coal gasification and steam reforming utilize the reaction between conventional fossil fuels and water to produce syngas (primarily CO and H 2 ) or CO 2 and H 2 mixture. However, both reactions require high temperatures (can be over 1000 °C) and pressures, which is an energy intensive process and has strict requirements on infrastructures. [10] The reaction products also need to be further separated to obtain relatively high-concentration of hydrogen. Cryogenic distillation takes the advantage of difference in gas boiling points, which can be applied to separate hydrogen from other gas components in the former two hydrogen production methods. However, cryogenic distillation is also an energy intensive process for low-temperature gas liquification. In comparison, hydrogen evolution reaction (HER) through water splitting is much-favored because of the following three prominent advantages: 1) Water splitting can be carried out at room temperature and ambient pressure, which is less restricted by infrastructure requirements. 2) Oxygen and hydrogen can be produced separately or selectively, which eliminate the need for gas separation. 3) Both the hydrogen source Highly efficient hydrogen evolution reactions (HERs) will determine the mass distributions of hydrogen-powered clean technologies in the future. Metal-organic frameworks (MOFs) are emerging as a class of crystalline porous materials. Along with their derivatives, MOFs have recently been under intense study for their applications in various hydrogen production techniques. MOF-based materials possess unique advantages, such as high specific surface area, crystalline porous str...

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Section: Fundamentals and Characterizationsmentioning

confidence: 99%

Metal–Organic Framework Based Catalysts for Hydrogen Evolution

Zhu

Zou

2018

Advanced Energy Materials

366

199

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“…The transition metal (M=Fe, Co, etc.) and nitrogen co-doped carbon materials (M-N-C), such as graphene [1,2], nanotube [3,4], and porous carbon [5,6], have shown great progress in ORR electrocatalysis, especially for Fe-N-C materials, which have been considered as the most promising catalysts for substituting the expensive Pt catalysts [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Binary Nitrogen Precursor-Derived Porous Fe-N-S/C Catalyst for Efficient Oxygen Reduction Reaction in a Zn-Air Battery

et al. 2018

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Abstract:It is still a challenge to synthesize non-precious-metal catalysts with high activity and stability for the oxygen reduction reaction (ORR) to replace the state-of-the art Pt/C catalyst. Herein, a Fe, N, S co-doped porous carbon (Fe-NS/PC) is developed by using g-C 3 N 4 and 2,4,6-tri(2-pyridyl)-1,3,5-triazine (TPTZ) as binary nitrogen precursors. The interaction of binary nitrogen precursors not only leads to the formation of more micropores, but also increases the doping amount of both iron and nitrogen dispersed in the carbon matrix. After a second heat-treatment, the best Fe/NS/C-g-C 3 N 4 /TPTZ-1000 catalyst exhibits excellent ORR performance with an onset potential of 1.0 V vs. reversible hydrogen electrode (RHE) and a half-wave potential of 0.868 V (RHE) in alkaline medium. The long-term durability is even superior to the commercial Pt/C catalyst. In the meantime, an assembled Zn-air battery with Fe/NS/C-g-C 3 N 4 /TPTZ-1000 as the cathode shows a maximal power density of 225 mW·cm −2 and excellent durability, demonstrating the great potential of practical applications in energy conversion devices.

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“…This composite structure exhibited excellent ORR activity with 0.93 V versus RHE onset potential in O 2 ‐saturated 0.1 m KOH aqueous solution. Further post‐synthetic treatment of MOF@GO to assemble 2D graphene into 3D graphene aerogel (GA) can help tackle aggregation of GO upon reduction, whereas at the same time yield hierarchical porosity due to confined growth of MOF within GA . A cobalt‐embedded in a nitrogen‐doped GA (Co–N–GA) catalyst was synthesized by adding PVP and GO aqueous dispersion with MOF precursors during solvothermal synthesis, followed by freeze‐drying to obtain MOF@GA, then pyrolysis at 900°C in Ar for 2 h. Etching with 1 m HCl was done to remove unstable Co‐based nanoparticles to get final catalyst Co–N–GA (Scheme ).…”

Section: Crystalline Microporous Solids Derived Catalystsmentioning

confidence: 99%

“…Microporous solids appear to allow access to optimal heterogeneous catalyst design, with tailorable pore systems . Commonly described aspects of microporous molecular solids include par excellence control and predictability of their pore size, window dimensions controlling access to the pores, and pore chemistry .…”

Section: Introductionmentioning

confidence: 99%

Microporous Solids En Route to Heterogeneous Electrocatalysis: The Oxygen Reduction Reaction

2019

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The recent progress and challenges in developing highly active microporous materials as heterogeneous electrocatalysts for oxygen reduction reaction (ORR) are discussed. Due to the slow kinetics of ORR, the search for novel highly stable catalysts that can outperform Pt‐based ones is a growing demand. Functional microporous materials and exceptional chemical stability are of great interest due to their unique catalytic properties. The crucial rule of porosity and catalyst design strategies are thoroughly discussed with emphasis on the influence of the degree of microporosity on the material's intrinsic catalytic activity and the current best practice for catalyst testing and activity reporting. This Review focuses on microporous materials, which are classified into crystalline as metal–organic frameworks (MOFs), covalent–organic frameworks (COFs), or amorphous porous–organic polymers (POPs) as to their recent utilization in constructing efficient ORR electrocatalysts. The fundamental challenges in obtaining stable catalysts with appreciable kinetics from non‐noble metal ions, and ways to form them utilizing microporous solids as catalyst matrices, are reviewed. The fundamental criteria for future generation ORR catalysts based on microporous solids, including stability in acidic medium, high electrical conductivity, and accessibility of the active sites within the matrix are highlighted for guidance to future works.

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Construction of a cobalt-embedded nitrogen-doped carbon material with the desired porosity derived from the confined growth of MOFs within graphene aerogels as a superior catalyst towards HER and ORR

Abstract: Co–N–GA is synthesized and presents better HER activity in an acidic environment than almost all non-precious metal catalysts.

Cited by 87 publications

References 38 publications

Metal–Organic Framework Based Catalysts for Hydrogen Evolution

Metal–Organic Framework Based Catalysts for Hydrogen Evolution

Binary Nitrogen Precursor-Derived Porous Fe-N-S/C Catalyst for Efficient Oxygen Reduction Reaction in a Zn-Air Battery

Microporous Solids En Route to Heterogeneous Electrocatalysis: The Oxygen Reduction Reaction

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