Synergetic Interaction of Additive Dual Nanocatalysts to Accelerate Oxygen Reduction Reaction in Fuel Cell Cathodes

Chen, Yun; Liang, Liang; Paredes-Navia, Sergio A.; Hinerman, Alec; Gerdes, Kirk; Song, Xueyan

doi:10.1021/acscatal.9b00811

Cited by 22 publications

(20 citation statements)

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“…Proton exchange membrane fuel cells (PEMFCs) have a promising potential in green and sustainable energy conversion technology due to their high efficiency and carbon-free emissions. [1][2][3][4][5][6] However, large-scale implementation of PEMFCs has been seriously limited by the earth scarcity and high price of Pt-based catalysts for the cathodic oxygen reduction reaction (ORR). [7][8][9][10][11][12] As a result, exploring a highly efficient ORR electrocatalyst based on earth-abundant elements to speed up the widespread application of PEMFCs is of utmost urgency.…”

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confidence: 99%

Atomically Dispersed Co‐Pyridinic N‐C for Superior Oxygen Reduction Reaction

Fei

Yan

et al. 2020

Advanced Energy Materials

195

107

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increasing interest since it exhibits a suppressed Fenton reactivity in comparison to Fe-N-C while maintains a remarkable catalytic activity. [18-20] To rationally design CoN -C catalyst for ORR, downsizing active species to single-atom scale and intentionally incorporating specific N into carbon matrix have been proposed to facilitate the catalytic process. [21-27] The former strategy can achieve a maximum atom-utilization efficiency and full exposure of active sites while the latter strategy usually involves pyridinic-N construction to optimize the charge distribution and improve the density of states at the Fermi level of the adjacent C atoms, facilitating the oxygen adsorption and reduction reaction. [28,29] For example, Yin et al. synthesized singleatom CoN x-C electrocatalyst through the pyrolysis of cobalt-coordinated framework porphyrin with graphene and found that it exhibited a high half-wave potential of 0.83 V, much better than Co nanoparticles-N-C electrocatalyst (0.73 V). [30] Han et al. investigated the size effect on the electrocatalytic activity of Co catalysts from nanometer to singleatom scale, demonstrating that cobalt single atoms on N-doped carbon could achieve a higher half-wave potential (0.82 V) and a larger limiting diffusion current density (4.96 mA cm −2) than atomic Co clusters (0.81 V, 4.44 mA cm −2) and Co nanoparticles counterpart (0.80 V, 3.86 mA cm −2). [31] Wang et al. developed a laser irradiation strategy to modulate the relative contents of pyridinic and pyrrolic nitrogen dopants in the electrocatalyst and reported that pyridinic-NCo bonding instead of pyrrolic-N bonding could optimize the adsorption energy of reaction intermediates in ORR process. [32] Despite prominent achievements that have been made recently, most studies on CoN -C catalysts focused on only one of the above-proposed strategies, and thus their catalytic performance is still unsatisfied to meet the practical application. Therefore, developing an effective synthetic strategy for the integration of generating atomically dispersed active sites and achieving pyridinic-N-optimized electronic structure to increase the catalytic activity of CoN -C catalyst is highly demanded but remains significant challenging. Herein, we have innovatively developed a highly effective lysozyme (Lys)-assisted metal-organic framework (MOF) approach to prepare single-atom Co implanted pyridinic-N doped porous carbon catalysts. During the pyrolysis process, the attached Lys on the surrounding of Co-ZIF-8 (zeolitic imidazolate frameworks) not only can effectively trap metal atoms Engineering transition metal-nitrogen-carbon (TM-N-C) catalysts with highdensity accessible active sites and optimized electronic structure holds great promise in the context of the electrochemical oxygen reduction reaction (ORR). Herein, a novel modification of a lysozyme-modified zeolitic imidazolate framework with isolated Co atoms anchored on dominated pyridinic-N doped carbon (Co-pyridinic N-C) is reported. The atomically dispersed Co allows the maximum ...

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confidence: 99%

Atomically Dispersed Co‐Pyridinic N‐C for Superior Oxygen Reduction Reaction

Fei

Yan

et al. 2020

Advanced Energy Materials

195

107

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“…Additionally, since CoO x is considered a promising ORR catalyst besides Pt, [113][114][115] Chen et al [116] employed ALD technique to coat a dual electrocatalyst consisting of a superjacent 2 nm CoO x layer and 3 nm discrete Pt particles into the porous lanthanum strontium manganite (LSM)/yttria-stabilized zirconia (YSZ) cathode (Figure 13a-f ). The (trimethyl)methylcyclopentadienyl platinum(IV) and the deionized water were used as Pt precursor and oxidant for depositing the Pt layer, and the bis-(cyclopentadienyl) cobalt(II) and ozone were chosen as Co and oxidant, respectively, for CoO x layer growth.…”

Section: Integration Of Multiple Ald Materialsmentioning

confidence: 99%

“…To date, ALD has been employed to manufacture varieties of devices in the microelectronics industry on a commercial scale. As the trend toward sustainable development grows, ALD has also attracted significant interest in catalysis, owing to its great advantages in the precise construction and control of atomic-level [116] Copyright 2019, American Chemical Society. (h) Schematic illustration for depositing Pt-Ru dimers on nitrogen-doped carbon nanotubes (NCNTs).…”

Section: Conclusion and Perspectivementioning

confidence: 99%

Efficient Modulation of Electrocatalyst Interfaces by Atomic Layer Deposition: Fundamentals to Application

Zhou

Guo

et al. 2022

Adv Energy and Sustain Res

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Under the scope of "carbon neutrality" and "emissions peak," renewable energy technologies and systems relying on electrocatalytic reactions (e.g., oxygen evolution reaction (OER), oxygen reduction reaction (ORR), hydrogen evolution reaction (HER), and carbon dioxide reduction reaction (CO 2 RR)), though kinetically slow, are attractive. To promote the efficiency of such systems, engineering of the electrocatalyst interface is an effective strategy. In the fabrication toolbox for complex surface/interface, the advanced atomic-layer deposition (ALD) technique is superior to conventional methods, evidenced by precise control of thickness, composition, uniformity, etc. This review summarizes recent developments in ALD implementation in a variety of electrocatalytic systems, especially the electrode interface preparation and modulation. Beyond all doubt, the introduction of the ALD process could dramatically increase the number of electrocatalytic-active sites and hence improve the performance. However, its practical application in this field is open to deliberation, while process cost and complexity are in consideration.

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“…Although researchers have been actively working on the development of non-precious metal electrocatalysts for the ORR, catalysts with high activity and durability are urgently needed. [6][7][8][9][10][11][12][13][14][15][16][17][18] So far, transition metal (M) and nitrogen co-doped carbon materials containing M-N x active centers are considered as the most promising catalyst materials. The transition metal-nitrogen-carbon (M-N-C) catalysts could provide more active sites to improve the ORR performance.…”

Section: Introductionmentioning

confidence: 99%