High loading single-atom Cu dispersed on graphene for efficient oxygen reduction reaction

Han, Guang; Zheng, Yu; Zhang, Xue; Wang, Zhiqiang; Gong, Yue; Du, Chunyu; Banis, Mohammad Norouzi; Yiu, Yun Mui; Sham, Tsun‐Kong; Gu, Lin; Sun, Yanchun; Wang, Yajing; Wang, Jinpeng; Gao, Yunzhi; Yin, Geping; Sun, Xueliang

doi:10.1016/j.nanoen.2019.104088

Cited by 158 publications

(103 citation statements)

References 77 publications

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“…[1] In particular, single atoms of metals such Fe, Co, or Cu anchored on conductive carbon nanomaterials have recently been reported to show good catalytic activities for ORR. [11,[17][18][19][20][21][22][23][24] For example, Han et al synthesized Fe-N x -C by pyrolyzing ZIF-8 type metal-organic framework (MOF) composed of Fe-1,10-phenanthroline (Fe-Phen) at 900 °C under an inert atmosphere, and the material showed electrocatalytic activity toward the ORR with an onset potential of 1.05 V versus reversible hydrogen electrode (RHE) and a half-wave potential of 0.91 V vs RHE. [19] The authors also showed that the material could serve as an air cathode catalyst with a high Developing efficient, inexpensive, and durable electrocatalysts for the oxygen reduction reaction (ORR) is important for the large-scale commercialization of fuel cells and metal-air batteries.…”

Section: Introductionmentioning

confidence: 99%

Nonprecious Bimetallic Sites Coordinated on N‐Doped Carbons with Efficient and Durable Catalytic Activity for Oxygen Reduction

Yuan

Cui

Zhang

et al. 2020

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Developing efficient, inexpensive, and durable electrocatalysts for the oxygen reduction reaction (ORR) is important for the large‐scale commercialization of fuel cells and metal–air batteries. Herein, a hierarchically porous bimetallic Fe/Co single‐atom‐coordinated N‐doped carbon (Fe/Co‐Nx‐C) electrocatalyst for ORR is synthesized from Fe/Co‐coordinated polyporphyrin using silica template‐assisted and silica‐protection synthetic strategies. In the synthesis, first silica nanoparticles‐embedded, silica‐protected Fe/Co‐polyporphyrin is prepared. It is then pyrolyzed and treated with acidic solution. The resulting Fe/Co‐Nx‐C material has a large specific surface area, large electrochemically active surface area, good conductivity, and catalytically active Fe/Co‐Nx sites. The material exhibits a very good electrocatalytic activity for the ORR in alkaline media, with a half‐wave potential of 0.86 V versus reversible hydrogen electrode, which is better than that of Pt/C (20 wt%). Furthermore, it shows an outstanding operational stability and durability during the reaction. A zinc–air battery (ZAB) assembled using Fe/Co‐Nx‐C as an air‐cathode electrocatalyst gives a high peak power density (152.0 mW cm−2) and shows a good recovery property. Furthermore, the performance of the battery is better than a corresponding ZAB containing Pt/C as an electrocatalyst. The work also demonstrates a synthetic route to a highly active, stable, and scalable single‐atom electrocatalyst for ORR in ZABs.

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Section: Introductionmentioning

confidence: 99%

Nonprecious Bimetallic Sites Coordinated on N‐Doped Carbons with Efficient and Durable Catalytic Activity for Oxygen Reduction

Yuan

Cui

Zhang

et al. 2020

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“…Similarly, Figure 2d shows that the edge position of Cu K-edge XANES spectra of CuZn/NC locates between Cu foil and CuO, suggesting the average electronic state of the Cu species is between Cu(0) and Cu(II). [46,47] Cu K-edge EXAFS of CuZn/NC (Figure 2e) clearly indicates two main peaks at 1.5 and 2.2 Å, which could be attributed to Cu−N scattering paths and Cu−M (M = Cu or Zn) coordinations, respectively. [31,45] The XPS spectrum of the Cu 2p was illustrated in Figure 2f.…”

Section: Resultsmentioning

confidence: 99%

Engineering Atomic Sites via Adjacent Dual‐Metal Sub‐Nanoclusters for Efficient Oxygen Reduction Reaction and Zn‐Air Battery

Liu

et al. 2020

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N‐coordinated transition‐metal materials are crucial alternatives to design cost‐effective, efficient, and highly durable catalysts for electrocatalytic oxygen reduction reaction. Herein, the synthesis of uniformly distributed Cu−Zn clusters on porous N‐doped carbon, which are accompanied by Cu/Zn‐Nx single sites, is demonstrated. X‐ray absorption fine structure tests reveal the co‐existence of M−N (M = Cu or Zn) and M−M bonds in the catalyst. The catalyst shows excellent oxygen reduction reaction (ORR) performance in an alkaline medium with a positive half‐wave potential of 0.884 V, a superior kinetic current density of 36.42 mA cm−2 at 0.85 V, and a Tafel slope of 45 mV dec−1, all of which are among the best‐reported results. Furthermore, when employed as an air cathode in Zn‐Air battery, it reveals a high open‐cycle potential of 1.444 V and a peak power density of 164.3 mW cm−2. Comprehensive experiments and theoretical calculations approved that the high activity of the catalyst can be attributed to the collaboration of the Cu/Zn‐N4 sites with CuZn moieties on N‐doped carbons.

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“…Following the same strategy, Cu SACs with Cu loading of 5.4 wt% on graphene [109] and Fe SACs with a high metal loading of 18.2 wt% were prepared, [91] as shown in Figures 3a and 3b. More important, a general strategy for fabricating a wide range of metal SACs with metal loadings up to 12.1 wt% was designed through in situ pyrolysis of g‐C 3 N 4 , as shown in Figure 3c [110] .…”

Section: Synthesis Strategies Of High Metal Loading Sacsmentioning

confidence: 99%

“…N-contained carbon-based materials, with diversified structures, have been widely used to anchor metal atoms and avoid aggregation. N-contained carbon-based substrates can be obtained directly by pyrolysis N-contained precursors, [104][105][106][107][108] or can be generated in situ by pyrolysis of graphitic carbon nitride (g-C 3 N 4 ), [109][110][111] or porous polymeric materials like covalent triazine frameworks (CTFs), [112][113] and MOFs. [100][101][102]…”

Section: N-contained Substratesmentioning

confidence: 99%

Synthesis of High Metal Loading Single Atom Catalysts and Exploration of the Active Center Structure

Wang

Liu

2020

ChemCatChem

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Single‐atom catalysts (SACs) have been rising recently as a new frontier in the catalysis field. Due to maximum atom utilization efficiency and tunable electronic structures, SACs exhibit highly distinctive catalytic performance from bulk counterparts. SACs with high metal loading will facilitate practical applications. To that end, this Review focuses on recent strategies to maximize metal loading. An appropriate substrate, mainly heteroatom‐doped carbon materials, is the key to avoiding aggregation or sintering during synthetic procedures. The coordination site construction and spatial confinement strategies are adopted to prepare SACs with high metal loading. Advanced characterization techniques with atomic resolution are indispensable for identification of the exact structure of SACs. This is true, especially for the applications and challenges in developing in situ/operando characterization techniques at the atomic level, which are discussed in this Review. Moreover, it is fundamentally necessary to investigate the active center structure, which facilitates any design of efficient SACs that can maximize single‐atom catalytic activity. Furthermore, this Review highlights challenges and prospects for development of SACs.

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High loading single-atom Cu dispersed on graphene for efficient oxygen reduction reaction

Cited by 158 publications

References 77 publications

Nonprecious Bimetallic Sites Coordinated on N‐Doped Carbons with Efficient and Durable Catalytic Activity for Oxygen Reduction

Nonprecious Bimetallic Sites Coordinated on N‐Doped Carbons with Efficient and Durable Catalytic Activity for Oxygen Reduction

Engineering Atomic Sites via Adjacent Dual‐Metal Sub‐Nanoclusters for Efficient Oxygen Reduction Reaction and Zn‐Air Battery

Synthesis of High Metal Loading Single Atom Catalysts and Exploration of the Active Center Structure

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