Sponge Assembled by Graphene Nanocages with Double Active Sites to Accelerate Alkaline HER Kinetics

Gu, Yu; Xi, Baojuan; Wei, Ruchao; Fu, Qiang; Qain, Yitai

doi:10.1021/acs.nanolett.0c03565

Cited by 50 publications

(38 citation statements)

References 60 publications

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“…Unlike 1D and 2D channels, the structure of a 3D channel has more possibilities. It could be uniform [90] or nonuniform, [33] regular [91] or irregular, [92] symmetrical [93] or asymmetrical, [40] spherical [41] or cubic, [42] relatively open [94] or closed, [95] macroporous, [96] mesoporous, [97] microporous, [43] or a combination. [98] Strictly speaking, most of the published porous structures contain 3D channels.…”

Section: Electrocatalysts Confined In Inactive Host Materialsmentioning

confidence: 99%

Electrocatalytic Hydrogen Evolution Reaction Related to Nanochannel Materials

Pan

Jing

et al. 2021

Small Structures

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Due to the high efficiency and clean process, electrocatalytic hydrogen evolution reaction (HER) is emerging as the most promising way for hydrogen (H 2 ) production, where the bottleneck is the relatively low catalytic activity for nonprecious electrocatalysts/electrodes. Currently, porous materials with channel structures show great potential toward outstanding HER performance. Herein, existing HER electrocatalysts/electrodes with 1D, 2D, and 3D channels are introduced. Recent advances as well as challenges for HER electrocatalysts/ electrodes are presented first. Then, different configuration types comprising electrocatalysts confined in inactive host porous materials, electrocatalysts directly working as host materials, and electrocatalysts confined in active host porous materials are illustrated for 1D, 2D, and 3D, respectively. Finally, the perspective for porous electrocatalysts/electrodes is discussed for future innovations of HER application.

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Section: Electrocatalysts Confined In Inactive Host Materialsmentioning

confidence: 99%

Electrocatalytic Hydrogen Evolution Reaction Related to Nanochannel Materials

Pan

Jing

et al. 2021

Small Structures

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“…Along with the global warming and energy shortage, environment-friendly renewable energy is expected to replace fossil fuels [1][2][3]. Currently, hydrogen attracts great attention by reason of zero carbon emission and ease to fabricate [4][5][6]. Electrocatalytic water splitting as a technology that large-scale produces hydrogen and oxygen could satisfy the demands of clean and sustainable energy.…”

Section: Introductionmentioning

confidence: 99%

Interface engineering and heterometal doping Mo-NiS/Ni(OH)2 for overall water splitting

Zhang

et al. 2021

Nano Res.

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101

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Developing cost-effective, efficient and bifunctional electrocatalysts is vital for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) application. The catalytic activity of electrocatalysts could be optimized by reasonable electronic structure regulation and increasing active sites. Herein, we report the design and fabrication of Mo-doped nickel sulfide/hydroxide heterostructures (Mo-NiS/Ni(OH) 2 ) as a multisite water splitting catalyst via straightforward solvothermal and in-situ growth strategy. Based on foreign metal doping and interface interaction, the electronic conductivity of heterostructures is improved and the charge transfer kinetics across the interface is promoted, which are demonstrated by the theoretical calculations. Mo-NiS/Ni(OH) 2 electrocatalyst is endowed with high electrocatalytic performance for water splitting and remarkable durability in alkaline electrolyte. It exhibits the low overpotential of 186 and 74 mV at 10 mA•cm −2 for OER and HER, respectively. Importantly, after continuously working for 50 h, the current densities of HER and OER both show negligible degeneration. Even, the resulting Mo-NiS/Ni(OH) 2 better catalyzes water splitting, yielding a current density of 10 mA•cm −2 at a cell voltage of 1.5 V and outperforming Pt/C-IrO 2 couple (1.53 V). This result demonstrates that transition metal doping and heterogeneous interface engineering are useful means for conventional catalyst design.

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“…The ECSA-normalized LSV curves also demonstrate both asymmetric asy-PB/rGO and asy-PB-A/rGO exhibit higher intrinsic ORR catalytic activities than symmetric sy-P/ rGO and sy-PB/rGO (Figures S37 and S38). [19] As shown in Figure 4 f, the mass activities of prepared catalysts were calculated at 0.70 V vs. RHE to evaluate their catalytic activities, where the mass activities of asymmetric asy-PB/ rGO (4.80 A g À1 ) and asy-PB-A/rGO (4.45 A g À1 ) are much higher than those of symmetric sy-P/rGO (2.36 A g À1 ), sy-PB/ rGO (3.25 A g À1 ) and pure rGO (1.01 A g À1 ). The smaller ECSAs and mass activities also indicate that the pure rGO has limited contribution to the efficient electrocatalytic activity.…”

Section: Methodsmentioning

confidence: 99%

Controlled Asymmetric Charge Distribution of Active Centers in Conjugated Polymers for Oxygen Reduction

Yao

Wang

et al. 2021

Angewandte Chemie

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Active center reconstruction is essential for high performance oxygen reduction reaction (ORR) electrocatalysts. Usually, the ORR activity stems from the electronic environment of active sites by charge redistribution. We introduce an asymmetry strategy to adjust the charge distribution of active centers by designing conjugated polymer (CP) catalysts with different degrees of asymmetry. We synthesized asymmetric backbone CP (asy-PB) by modifying B ! N coordination bonds and asymmetric sidechain CP (asy-PB-A) with different alkyl chain lengths. Both CPs with backbone and sidechain asymmetry exhibit superior ORR performance to their symmetric counterparts (sy-P and sy-PB). The asy-PB with greater asymmetry shows higher catalytic activity than asy-PB-A with relatively smaller asymmetry. DFT calculations reveal that the increased dipole moment and non-uniform charge distribution caused by asymmetric structure endows the center carbon atom of bipyridine with efficient catalytic activity.

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Sponge Assembled by Graphene Nanocages with Double Active Sites to Accelerate Alkaline HER Kinetics

Cited by 50 publications

References 60 publications

Electrocatalytic Hydrogen Evolution Reaction Related to Nanochannel Materials

Electrocatalytic Hydrogen Evolution Reaction Related to Nanochannel Materials

Interface engineering and heterometal doping Mo-NiS/Ni(OH)2 for overall water splitting

Controlled Asymmetric Charge Distribution of Active Centers in Conjugated Polymers for Oxygen Reduction

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