Silica–Polypyrrole Hybrids as High‐Performance Metal‐Free Electrocatalysts for the Hydrogen Evolution Reaction in Neutral Media

Feng, Jin‐Xian; Xu, Han; Ye, Shenghua; Ouyang, Gangfeng; Tong, Yexiang; Li, Gao‐Ren

doi:10.1002/anie.201702934

Cited by 223 publications

(105 citation statements)

References 47 publications

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“…[27,28] 2) The Co 2p 1/2 and Co 2p 3/2 signals in the XPS spectra of CoP@PPy are positioned at lower binding energies than those of CoP (Δ = 0.6 and 0.5 eV), indicating increased electron density at the Co centers provided by PPy in the CoP@PPy sample. This means that the CC bond energy declines because the π-conjugation system in the pyrrole ring extended to the CoP core.…”

Section: Resultsmentioning

confidence: 99%

Bifunctional Conducting Polymer Coated CoP Core–Shell Nanowires on Carbon Paper as a Free‐Standing Anode for Sodium Ion Batteries

Zhang

Yang

et al. 2018

Advanced Energy Materials

115

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This study proposes a conformal surface coating of conducting polymer for protecting 1D nanostructured electrode material, thereby enabling a free‐standing electrode without binder for sodium ion batteries. Here, polypyrrole (PPy), which is one of the representative conducting polymers, encapsulated cobalt phosphide (CoP) nanowires (NWs) grown on carbon paper (CP), finally realizes 1D core–shell CoP@PPy NWs/CP. The CoP core is connected to the PPy shell via strong chemical bonding, which can maintain a Co–PPy framework during charge/discharge. It also possesses bifunctional features that enhances the charge transfer and buffers the volume expansion. Consequently, 1D core–shell CoP@PPy NWs/CP demonstrates superb electrochemical performance, delivering a high areal capacity of 0.521 mA h cm−2 at 0.15 mA cm−2 after 100 cycles, and 0.443 mA h cm−2 at 1.5 mA cm−2 even after 1000 cycles. Even at a high current density of 3 mA cm−2, a significant areal discharge capacity reaching 0.285 mA h cm−2 is still maintained. The outstanding performance of the CoP@PPy NWs/CP free‐standing anode provides not only a novel insight into the modulated volume expansion of anode materials but also one of the most effective strategies for binder‐free and free‐standing electrodes with decent mechanical endurance for future secondary batteries.

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Section: Resultsmentioning

confidence: 99%

Bifunctional Conducting Polymer Coated CoP Core–Shell Nanowires on Carbon Paper as a Free‐Standing Anode for Sodium Ion Batteries

Zhang

Yang

et al. 2018

Advanced Energy Materials

115

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“…As for electrode materials, hydrophilicity is important for providing an efficient access for ions to the electrode/electrolyte interface . Water contact angle measurement is performed in Figure S5 (Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

“…Carbon‐based supercapacitors have greatly attracted attention due to the large surface area, excellent conductivity, wide pore size distribution, and high cycle stability of carbon electrode materials . Main carbon electrode materials include 1D carbon nanotubes (CNTs), carbon fibers (CFs), 2D graphene, and 3D mes‐carbon .…”

Section: Introductionmentioning

confidence: 99%

Hierarchical 3D All‐Carbon Composite Structure Modified with N‐Doped Graphene Quantum Dots for High‐Performance Flexible Supercapacitors

Liu

Wang

et al. 2018

Small

111

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Flexible supercapacitors have shown enormous potential for portable electronic devices. Herein, hierarchical 3D all-carbon electrode materials are prepared by assembling N-doped graphene quantum dots (N-GQDs) on carbonized MOF materials (cZIF-8) interweaved with carbon nanotubes (CNTs) for flexible all-solid-state supercapacitors. In this ternary electrode, cZIF-8 provides a large accessible surface area, CNTs act as the electrical conductive network, and N-GQDs serve as highly pseudocapactive materials. Due to the synergistic effect and hierarchical assembly of these components, N-GQD@cZIF-8/CNT electrodes exhibit a high specific capacitance of 540 F g at 0.5 A g in a 1 m H SO electrolyte and excellent cycle stability with 90.9% capacity retention over 8000 cycles. The assembled supercapacitor possesses an energy density of 18.75 Wh kg with a power density of 108.7 W kg . Meanwhile, three supercapacitors connected in series can power light-emitting diodes for 20 min. All-solid-state N-GQD@cZIF-8/CNT flexible supercapacitor exhibits an energy density of 14 Wh kg with a power density of 89.3 W kg , while the capacitance retention after 5000 cycles reaches 82%. This work provides an effective way to construct novel electrode materials with high energy storage density as well as good cycling performance and power density for high-performance energy storage devices via the rational design.

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“…Where e − –catalyst denotes metal‐bound electrons, H–catalyst and H 2 –catalyst represent a hydrogen atom and a hydrogen molecule adsorbed onto a surface metal atom, respectively. Si‐OH groups on the external surface of the SiO 2 nanosphere serve as negative electricity adsorption centers, which facilitate adsorption of H 3 O + more easily, which will benefit the HER . The Tafel slope calculated for Au@SiO 2 ‐Pt from the polarization curves (Figure a) equaled 52 mV dec −1 , which is significantly lower than the values of 123 mV dec −1 and 72 mV dec −1 obtained for Au@SiO 2 and Pt@SiO 2 (Figure b), respectively.…”

Section: Methodsmentioning

confidence: 75%

Soft Template‐Directed Reactions: One‐Pot Synthetic Route for Bimetallic Core–Satellite–Shell Structured Electrocatalytic Nanospheres

Wang

Wei

et al. 2018

ChemCatChem

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A one‐pot synthesis strategy, which retards nanoparticle (NP) agglomeration in the initiation of reaction and prevents the combination of the core and small species, is reported. In the present study, we synthesize bimetallic core–shell structures of single Au cores and satellites‐like Pt NPs. The core was generated by using HAuCl4; thus, providing the unique conductive ability for electrons. The entire evolution process of Pt NPs during the whole reaction was confined within the SiO2 nanospheres. Through strong electrostatic attraction, the Pt NPs in a tight H3O+ packing accordingly increased the adsorbed hydrogen (Had) rate. The comparative investigation of electrocatalytic activities of the products and commercial Pt/C‐20 % in the hydrogen evolution reaction (HER) revealed that the Au@SiO2‐Pt, with a strong metal interaction effect in the electrolyte, exhibits a low Tafel slope of 52 mV dec−1, with its catalytic activity being maintained for at least 10 h. Impressively, it also demonstrates a high turnover frequency (TOF) value of 0.11 s−1.

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Silica–Polypyrrole Hybrids as High‐Performance Metal‐Free Electrocatalysts for the Hydrogen Evolution Reaction in Neutral Media

Cited by 223 publications

References 47 publications

Bifunctional Conducting Polymer Coated CoP Core–Shell Nanowires on Carbon Paper as a Free‐Standing Anode for Sodium Ion Batteries

Bifunctional Conducting Polymer Coated CoP Core–Shell Nanowires on Carbon Paper as a Free‐Standing Anode for Sodium Ion Batteries

Hierarchical 3D All‐Carbon Composite Structure Modified with N‐Doped Graphene Quantum Dots for High‐Performance Flexible Supercapacitors

Soft Template‐Directed Reactions: One‐Pot Synthetic Route for Bimetallic Core–Satellite–Shell Structured Electrocatalytic Nanospheres

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