Among them, reduced graphene oxide (RGO) has been widely used to construct highly conductive and porous networks, which can be used to load active electrocatalyst. Advanced Oxygen Reduction Electrocatalyst Based on ... Conducting two-dimensional (2D) materials such as low-defect graphene would be an additive material of choice, so that its effective coupling with nanoelectrocatalysts could enable the best use of the surficial area of the catalysts while providing an electric highway for charge and ion transportation. The Application of NiO/Graphene as an Electrocatalyst in ... 3.1. Single Mn Atom Anchored on Nitrogen‐Doped Graphene as a ... The results clearly reveal that direct grown of MoS2 NSs on rGO have been ac … Metal-organic framework-based CoP/reduced graphene oxide: high-performance bifunctional electrocatalyst for overall water splitting. Few-layered ReS2 nanosheets grown on graphene as ... The graphene aerogel (GA) provides abundant space for the in-situ growth of MFN and functions as a "bridge" to connect nickel foam (NF) with MFN by virtue of good conductivity. Cobalt sulfide nanoparticles grown on nitrogen and sulfur ... Its synthesis procedures are generally based on the chemical oxidation of graphite and subsequent thermal or chemical reduction. Figure 2 shows the Raman spectra of pure MoS 2 nanosheets and Pt/Mo-90 composite, obtained over the range of 360-430 cm −1, where two longitudinal peaks of pure MoS 2 at 384 cm −1 and 407 cm −1 are assigned to the . Carbon 111 , 577-586 (2017). Related terms: Graphene; Carbon Nanotubes; Platinum; Conductivity; Metal-Organic Framework; Water Splitting; Hydrogen Evolution; Oxygen Evolution; Nanoparticles An oxygen reduction electrocatalyst based on carbon ...Catalysts | Free Full-Text | N, S, P-Codoped Graphene ...Nitrogen-Doped Reduced Graphene Oxide Supported Pd4.7Ru ... Sheet-like carbon-nitrogen (CNx)/graphene composites with a high content of nitrogen (x ⩽ 0.15) was prepared by the carbonization of polypyrrole (PPy)/reduced-graphene-oxide (rGO) composite at 600-800°C. 15-17 however, it is difficult to obtain small and well-dispersed graphene supported ag nps since ag nps are easy to … An oxygen reduction electrocatalyst based on carbon nanotube-graphene complexes. A novel strategy is used to synthesize a non-noble-metal-based electrocatalyst of the OER by finely combining layered FeNi double hydroxide that is catalytically active and electric conducting graphene sheets, taking advantage of the electrostatic attraction between . 1. Front Chem. Silver sulfide nanoparticles incorporated into graphene oxide: an efficient electrocatalyst for the oxygen reduction reaction. CAS Google . Super-Hydrophilic Hierarchical Ni-Foam-Graphene-Carbon Nanotubes-Ni 2 P-CuP 2 Nano-Architecture as Efficient Electrocatalyst for Overall Water Splitting. Electrochemical analysis revealed that the as-obtained edge-rich graphene showed excellent ORR activity through a one-step and four-electron pathway. The functionalization of them seems to enhance in-situ MOF/graphene electrocatalyst's activity. Molybdenum disulfide nanosheets/reduced graphene oxide (MoS2 NSs/rGO) nanohybrid as a highly effective catalyst for hydrogen evolution reaction (HER) have been successfully synthesized by a facile microwave-assisted method. Sk Riyajuddin. Epub 2017 Dec 13. The resultant N-graphene was demonstrated to act as a metal-free electrode with a much better electrocatalytic activity, long-term operation stability, and tolerance to crossover effect than platinum for oxygen reduction via a four-electron pathway in alkaline fuel cells. For the first time, we developed edge-rich and dopant-free graphene as a highly efficient ORR electrocatalyst. Boron-Doped Electrocatalytic Oxygen Reduction Reaction Graphene as Active Electrocatalyst for Oxygen Reduction ChemSusChem 7 - 8 (23) 2015: pp. Pandian Ganesan, Moni Prabu, Jakkid Sanetuntikul, Sangaraju Shanmugam. Lithium Intercalated-Layered Manganese Oxide and Reduced Graphene Oxide Composite as a Bifunctional Electrocatalyst for ORR and OER Soracha Kosasang 1 , Nattapol Ma , Nutthaphon Phattharasupakun 1 and Montree Sawangphruk 2,3 An electrocatalyst can be heterogeneous such as a platinized electrode. Liao Y(1), Gao Y, Zhu S(1), Zheng J, Chen Z(2), Yin C(1), Lou X(1), Zhang D(1). Here, the hybrid of NiCo2S4 nanoparticles grown on graphene in situ is first described as an effective bifunctional nonprecious electrocatalyst for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in the alkaline medium. The different doping manners of the transition metals on graphene are also explored by others. Doping of Activated Graphene for Synergistically Enhanced 20. University of Sydney team advances rechargeable zinc-air batteries with bimetallic oxide-graphene hybrid electrocatalyst 16 August 2017 Researchers at the University of Sydney, with colleagues at Nanyang Technological University, have found a solution for one of the biggest stumbling blocks hindering the commercialization of rechargeable zinc . in the electrocatalytic field, graphene is regarded as an excellent support material, mainly because the intimate contact between the graphene support and metal particles enables the catalysts to be formed to have high activity. A novel strategy is used to synthesize a non-noble-metal-based electrocatalyst of the OER by finely combining layered FeNi double hydroxide that is catalytically active and electric conducting graphene sheets, taking advantage of the electrostatic attraction between . Epub 2016 Jan 12. Co-doped graphene as electrocatalyst: Catalytic cycle of oxygen evolution reaction over S-doped graphene is illustrated. Core-Shell Co/CoO Integrated on 3D Nitrogen Doped Reduced Graphene Oxide Aerogel as an Enhanced Electrocatalyst for the Oxygen Reduction Reaction. Molybdenum disulfide nanosheets/reduced graphene oxide (MoS2 NSs/rGO) nanohybrid as a highly effective catalyst for hydrogen evolution reaction (HER) have been successfully synthesized by a facile microwave-assisted method. Table 1. 24-26 Among the various supporting materials, graphene is one of the most attractive . Therefore, it is significant to design and synthesize a conductive and porous ReS 2 /RGO composite to remarkably enhance the conductivity and improve the HER performance. It is imperative to design an inexpensive, active, and durable electrocatalyst in oxygen reduction reaction (ORR) to replace carbon black supported Pt (Pt/CB). N-doped graphene samples with different N species contents were prepared by a two-step synthesis method and evaluated as electrocatalysts for the nitrate reduction reaction (NORR) for the first time. Bifunctional electrocatalyst: A nanocomposite with graphene-encapsulated Co 9 S 8 nanoparticles loaded on N,S-codoped carbon nanotubes is fabricated as a highly efficient and stable bifunctional electrocatalyst for the oxygen reduction and evolution reactions. The GNP film is superior to the traditional electrocatalyst, that is, platinum, both in charge-transfer resistance (exchange current) and in electrochemical stability under prolonged . Graphene and its derivatives have been reported in many articles as "metal-free" carbon electrocatalytic materials. In addition, innumerable kinds of electrocatalyst supports have been designed in the last decades, for example, graphene, nanocarbon materials, carbon black, and polymers, and so forth owing to their abundant reserves and promising electrolytic performance. In the present study, we synthesized NiCoMnO 4 nanoparticles anchored on nitrogen-doped graphene nanosheets as highly efficient bifunctional electrocatalysts for the Oxygen Reduction Reaction (ORR) and for the . 19 Briefly, graphene oxide (GO), which was produced via modified Hummers' method, 36 . From: Journal of Power Sources, 2016. Because graphene oxide has a large surface area and typ … One-Step Synthesis of B/N Co-doped Graphene as Highly Efficient Electrocatalyst for the Oxygen Reduction Reaction: Synergistic Effect of Impurities. Boron-Doped Electrocatalytic Oxygen Reduction Reaction Graphene as Active Electrocatalyst for Oxygen Reduction ChemSusChem 7 - 8 (23) 2015: pp. There are a lot of efforts to develop metal-free electrocatalyst based on reduced graphene oxide (rGO) doped with sulfur (S) and nitrogen (N) due to promising oxygen reduction reaction (ORR . Graphene-Co3O4 composite with a unique sandwich-architecture was successfully synthesized and applied as an efficient electrocatalyst for oxygen evolution reaction. Dr. Paulraj Arunkumar, Dr. Paulraj Arunkumar. Sk Riyajuddin. Thus, the present work provides a new strategy for the neodymium engineering synthesis of efficient rare earth-graphene composite electrocatalysts with a high electrochemical active area. Mainly, a high specific surface area of ∼2217 cm 2 g −1 and the porosity of graphene play major roles in the enhancement of activity. We used rGO instead of graphene oxide (GO) sheets as a template and a substrate to immobilize PPy since the PPy/GO composite agglomerates easily because of the dehydration of excess . This work provides the novel design of multifunctional electrocatalysts and dual-model batteries for the versatile application . The electrochemical parameters measured with modified GCE represent the effect of graphene oxide on methanol oxidation reaction catalysed by Co-MOF-71. Nat Nanotechnol 7:394-400. Li Y, Zhou W, Wang H, Xie LM, Liang YY, Wei F, Idrobo JC, Pennycook SJ, Dai HJ (2012) An oxygen reduction electrocatalyst based on carbon nanotube-graphene complexes. We have synthesized the first ORR electrocatalyst based on carbon nanotubes-graphene complexes, which exhibit a high activity, excellent tolerance to methanol and superior stability in . NiCo2S4@N/S-rGO was synthesized by a one-pot solvothermal strategy using Co(OAc)2, Ni(OAc)2, thiourea, and graphene oxide as precursors and ethylene glycol . Herein, Ag-MnFe 2 O 4 heterojunction nanoparticles supported on N, S, P-codoped graphene (NSPG) are developed with enhanced ORR and OER bifunctional electrocatalytic activities and stability. 7 - 11 Such measurements are generally performed in alkaline solution, where the catalytic activity is routinely . The nitrogen and sulfur co-doped three-dimensional graphene supported cobalt phosphide electrocatalyst was prepared using a two-step fabrication process that included hydrothermal self-assembly of cobalt oxides (CoO x) anchored, nitrogen/sulfur co-doped 3D-GN network and low-temperature phosphidation steps. Co,N,S-codoped three-dimensional graphene (Co,N,S/3DG) has been fabricated using Co(SCN) 2 as the precursor. The resulting ORR and OER performances are equal to or better than the top‐ranked electrocatalysts. An electrocatalyst is a catalyst that participates in electrochemical reactions.Electrocatalysts are a specific form of catalysts that function at electrode surfaces or, most commonly, may be the electrode surface itself. 2016 Mar 1;7(3):1690-1695. doi: 10.1039/c5sc04425a. The results clearly reveal that direct grown of MoS2 NSs on rGO have been ac … S. Wageh 1,2, Ahmed A. Al-Ghamdi 1, Arshid Numan 3,4 & Javed Iqbal 5 Journal of Materials Science: Materials in Electronics volume 31, pages 8127-8135 (2020)Cite this article Author information: (1)State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University , 800 Dongchuan Road, Shanghai 200240, People's Republic of China. 2018 Jan 19;24(4):928-936. doi: 10.1002/chem.201704515. The electrochemical performance of the air-cathode has a decisive impact on the discharge performance of ZABs because the sluggish oxygen reduction reaction (ORR) kinetics increase the overpotential of the air-cathode and hence the performance of ZABs. The synergetic effect of the catalyst structure overcomes the drawbacks of holey graphene approaches. Metal-O 2 batteries or fuel cells). In an acidic solution with a saturated calomel electrode as reference, the pyridinic-N dominant sample (NGR2) had an onset of 0.932 V and a half-wave potential of 0.833 V, showing the superior . Research output: Contribution to journal › Article › peer-review. Oxygen reduction reaction catalysts based on precious metals such as platinum or its alloys are routinely used in fuel cells because of their high activity. Defective VSe 2-Graphene Heterostructures Enabling In Situ Electrocatalyst Evolution for Lithium-Sulfur Batteries ACS Nano. Raman spectroscopy technique is an efficient non-destructive chemical analysis to investigate the structural properties and the details of the thickness of MoS 2 nanosheets. Molybdenum disulfide nanosheets/reduced graphene oxide (MoS2 NSs/rGO) nanohybrid as a highly effective catalyst for hydrogen evolution reaction (HER) have been successfully synthesized by a facile microwave-assisted method. This study therefore significantly increases the attractiveness of graphene-based electrocatalysts as potential cost-effective alternatives for Pt in PEMFCs. A Robust Ternary Heterostructured Electrocatalyst with Conformal Graphene Chainmail for Expediting Bi-Directional Sulfur Redox in Li-S Batteries Jingsheng Cai , College of Energy, Soochow Institute for Energy and Materials InnovationS (SIEMIS), Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province . The annealed NG (NG-A) possessed high specific surface area and a hierarchical porous texture, and exhibited remarkably improved electrocatalytic activity in the oxygen reduction reaction in both alkaline and acidic media. Besides, the Ni-N unit also promoted the OER/ORR over P-O doped graphene. MEA (Membrane Electrode Assembly) constituents and their functions. 1. Nitrogen-doped graphene (NG) was successfully synthesized by a novel, facile, and scalable bottom-up method. However, the catalytic activity of MnN 4-G for the ORR and the optimal reaction pathway remain obscure. 2016 Aug 22;4:36. doi: 10.3389/fchem.2016.00036. Cost-effective electrocatalysts for the oxygen evolution reaction (OER) are critical to energy conversion and storage processes. Boron-doped graphene was reported to be the best non-metal doped graphene electrocatalyst for the oxygen reduction reaction (ORR) working at an onset potential of 0.035 V (Jiao et al., 2014).In the present DFT study, intermediates and transition structures along the possible reaction pathways are determined. In particular for electrocatalytic applications, as a highly stable and conductive platform to anchor catalyst nanoparticles, graphene opens up new possibilities for designing the next generation electrocatalyst supports [4]. M. Praveen Kumar 5,1, Madhan Mohan Raju 5,1, A. Arunchander 2, Subbulakshmi Selvaraj 1, Golap Kalita 3, Tharangattu N. Narayanan 6,4, A. K. Sahu 6,2 and Deepak K. Pattanayak 6,1 As examples of graphene materials for OWS, hollow CoP nanomaterials loaded on N-doped graphene as a bifunctional electrocatalyst can reportedly show excellent performances at 1.58 V to reach a . Graphene, an atomic monolayer two-dimensional honeycomb lattice with hexagonal symmetry sp2 -hybridized carbon of graphite [1] which it has huge capability for the application in the field of nano-composites and nano-electronic instruments due to its excellent electrical, chemical, thermal, mechanical and structure properties [2], [3], [4]. Electrochemical tests show that the as-prepared hybrid material exhibited excellent HER . Single Mn atom on nitrogen-doped graphene (MnN 4-G) has exhibited good structural stability and high activity for the adsorption and dissociation of an O 2 molecule, becoming a promising single-atom catalyst (SAC) candidate for oxygen reduction reaction (ORR). 484 Citations (Scopus) Chemistry. Doping of Activated Graphene for Synergistically Enhanced 20. The produced FeNi-decorated and N-doped graphene can be exploited as a stable and effective electrocatalyst for the oxygen reduction reaction process in acid medium. B. Amide-functionalized graphene with 1,4-diaminobutane as efficient metal-free and porous electrocatalyst for oxygen reduction. Institute of Nano Science & Technology, Knowledge City, Sector-81, SAS Nagar, Manauli PO 140306, Punjab, India . Graphene supported Co-g-C3N4 as a novel metal-macrocyclic electrocatalyst for the oxygen reduction reaction in fuel cells Langmuir . Co-MOF-71/GO composite showed excellent peak current density (29.1 mA/cm 2) at lower potential (0.1 V) and scan rate of 50 mV/s. Nitrogen Doped Graphene as Metal Free Electrocatalyst for Efficient Oxygen Reduction Reaction in Alkaline Media and Its Application in Anion Exchange Membrane Fuel Cells. The development of a multifunctional electrocatalyst composed of nitrogen, phosphorus, and fluorine tri-doped graphene is reported, which was obtained by thermal activation of a mixt. Cobalt sulfide nanoparticles grown on nitrogen and sulfur codoped graphene oxide: An efficient electrocatalyst for oxygen reduction and evolution reactions. In this work, we synthesized Pd4.7Ru nanoparticles on nitrogen-doped reduced graphene oxide (Pd4.7Ru NPs/NrGO) by a facile microwave-assisted method. Chem Sci. In . To . Sustainable Energy & Fuels Graphene based materials as electrocatalyst for oxygen evolution reaction: A review Hwapyung Jung, Arun Karmakar, Arindam Adhikari, Rajkumar Patel and Subrata Kundu Abstract Continuous depletion of fossil fuels insisting us to find out suitable alternative energy sources to fulfill the global energy requirement. Due to their low cost and very high energy density, zinc-air batteries (ZABs) exhibit high potential for various energy applications. These comparisons clearly indicate the improved electrocatalytic performance of the core-shell porous Co/CoO-NGA electrocatalyst relative to the Co/CoO-NG, CoO-NGA, and NGA electrocatalysts; this could be due to well-defined 3D porous structure of nitrogen doped graphene supports, as well as the accelerated electron transfer in the core-shell . The results clearly reveal that direct grown of MoS2 NSs on rGO have been achieved. eCollection 2016. of polyaniline-coated graphene oxide and ammonium hexafluorophosphate (AHF). of polyaniline-coated graphene oxide and ammonium hexafluorophosphate (AHF). Graphene introduces more active sites into composite materials, reducing active material agglomeration and enhancing stability and efficiency. 1. According to the former studies , , , , single atom-doped graphene exhibits outstanding performance as a CRR electrocatalyst. A Complementary Co−Ni Phosphide/Bimetallic Alloy-Interspersed N-Doped Graphene Electrocatalyst for Overall Alkaline Water Splitting. 4040 - 4048. Bioinspired Synthesis of Reduced Graphene Oxide-Wrapped Geobacter sulfurreducens as a Hybrid Electrocatalyst for Efficient Oxygen Evolution Reaction April 2019 Chemistry of Materials 31(10) ACS Applied Materials & Interfaces 2017, 9 (34) , 28566-28576. Based on this trifunctional NiPG electrocatalyst, we realized dual-model Zn-CO 2 /Zn-O 2 batteries, switched by supplying CO 2 or O 2. School of Chemical Engineering, Chonnam National University, 300 Yongbong-dong, Buk-gu, Gwangju, 61186 Republic of Korea. Co Nanoparticles/Co, N, S Tri-doped Graphene Templated from In-Situ-Formed Co, S Co-doped g-C3N4 as an Active Bifunctional Electrocatalyst for Overall Water Splitting. Carbon-supported materials containing metals such as iron or cobalt as well as nitrogen impurities have been . Fazio, G., Ferrighi, L., Valentin, C.D. The development of a multifunctional electrocatalyst composed of nitrogen, phosphorus, and fluorine tri-doped graphene is reported, which was obtained by thermal activation of a mixt. 2020 Sep 22;14(9):11929-11938. doi: 10.1021/acsnano.0c05030. Low-cost and highly efficient electrocatalysts for oxygen reactions are of high importance for oxygen-related energy storage/conversion devices (e.g. With a similar strategy, edge-rich carb … 0.846 V and an onset potential of ca. Authors Haina Ci 1 . The synthesized Fe-N/C electrocatalyst exhibits unexpectedly ORR catalytic performance with a half-wave potential of ca. The graphene-like and porous structure of GPNCS enables the material to possess high conductivity and specific surface area, which are beneficial to the good performance as an electrocatalyst. Nitrogen atoms were introduced into the graphene by thermal reduction with NH3 gas and . Graphene has been used with nanoparticles and polymers in numerous applications such as energy storage devices and electrochemical sensors. Herein, a hierarchically porous PtNi nanoframe/N-doped graphene aerogel (PtNiNF-NGA) electrocatalyst with outstanding performance toward methanol oxidation reaction (MOR) in acid electrolyte has been developed via facile tert-butanol-assisted structure reconfiguration. Homogeneous electrocatalysts, which are soluble, assist in transferring electrons between the . It should be reiterated that very few studies of completely metal-free carbon-nitrogen systems have been performed in acidic media. 2013 Mar 19;29(11):3821-8. doi: 10.1021/la400003h. Herein, a lamellar bimetallic MFN (MIL-53(FeNi)) encapsulated in graphene aerogel-grafted Ni foam has been developed (denoted as MFN@GA/NF). In contrast, S, P-doped graphene (SPG) and N, P-doped graphene (NPG) show less stabilization for the heterojunction particles. Ahmed, M. S. & Kim, Y. 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