Coupling Sub‐Nanometric Copper Clusters with Quasi‐Amorphous Cobalt Sulfide Yields Efficient and Robust Electrocatalysts for Water Splitting Reaction

Liu, Yipu; Li, Qiuju; Si, Rui; Li, Guodong; Li, Wang; Liu, Dapeng; Wang, Dejun; Sun, Lei; Zou, Xiaoxin

doi:10.1002/adma.201606200

Cited by 355 publications

(194 citation statements)

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“…Figure 5a shows the overall water splitting activity of two-electrode system with the TiO 2 @Co 9 S 8 electrocatalysts as both cathode and anode in 1 m KOH solution (denoted as TiO 2 @Co 9 S 8 || TiO 2 @Co 9 S 8 ). Impressively, a significantly low cell voltage of 1.56 V is obtained at the current density of 10 mA cm −2 (Figure 5a), substantially lower than the Co 9 S 8 || Co 9 S 8 catalyzer cell (1.71 V) and other reported bifunctional electrocatalysts, [6,16,27,[38][39][40][41][42][43][44][45][46] (Figure 5b), and even close to the Pt/C || IrO 2 (1.54 V) catalyzer cell. [44] Figure 5c compares the chronopotentiometry curves of the TiO 2 @Co 9 S 8 || TiO 2 @Co 9 S 8 and Co 9 S 8 || Co 9 S 8 catalyzer cells collected at 10 mA cm −2 .…”

Section: Doi: 101002/advs201700772mentioning

confidence: 99%

“…[4,5] Currently, platinum (Pt)/Pt-based alloy and iridium/ruthenium oxides (IrO 2 /RuO 2 ) are considered as the most promising electrocatalysts for HER and OER, respectively, but their scarcity, high cost, and compromised stability hinder their widespread applications. [6,7] Additionally, the best working situation for those OER and HER catalysts is often mismatchable since OER preferably takes place in alkaline or neutral solution while HER in acidic medium. [8,9] This would cause compromised performance for overall water splitting.…”

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confidence: 99%

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Hollow TiO₂@Co₉S₈ Core–Branch Arrays as Bifunctional Electrocatalysts for Efficient Oxygen/Hydrogen Production

et al. 2017

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water splitting is recognized as a highly potential technology to convert electricity into environment friendly and renewable chemical fuels (hydrogen and oxygen). [1][2][3] The cathodic hydrogen evolution reaction (HER) and anodic oxygen evolution reaction (OER) depend heavily on the development of cost-effective high-performance electrocatalysts. [4,5] Currently, platinum (Pt)/Pt-based alloy and iridium/ruthenium oxides (IrO 2 /RuO 2 ) are considered as the most promising electrocatalysts for HER and OER, respectively, but their scarcity, high cost, and compromised stability hinder their widespread applications. [6,7] Additionally, the best working situation for those OER and HER catalysts is often mismatchable since OER preferably takes place in alkaline or neutral solution while HER in acidic medium. [8,9] This would cause compromised performance for overall water splitting. For instance, the commercial alkaline electrolyzers require high cell voltages (1.8-2.0 V) to drive water splitting, [10] far ahead of the theoretical value of ≈1.23 V owing to high overpotentials on the sluggish of OER and HER. Therefore, it is highly desirable to explore alternative high-performance and low-cost bifunctional OER/HER electrocatalysts for overall water splitting. [11][12][13][14][15] Over the past decades, great progress has been achieved on the development of non-noble metal-based electrocatalysts for both OER and HER. Various nonprecious metal oxides, [9] sulfides, [16] selenides, [17] phosphides, and nitrides [18,19] have been exploited. Among these electrocatalysts, cobalt sulfide (Co 9 S 8 ) is regarded as an attractive electrocatalyst for water splitting due to its high catalytic activity for HER and OER simultaneously, and excellent electrochemical stability. In comparison to bulk Co 9 S 8 , nanostructured Co 9 S 8 and its composites could afford more active sites and faster transfer rate of ions/electrons during the electrocatalytic reaction, and thus usually exhibiting enhanced HER and OER activities. [20][21][22][23][24] Currently, several Co 9 S 8 nanostructures (e.g., nanoparticles [25] and nanospheres [26] ) and their composites with carbons (Co 9 S 8 /reduced graphene oxides (RGO), [22] Co 9 S 8 /(N, S, P)-doped carbons, [27] Co 9 S 8 /Fe 3 O 4 / RGO, [23] and Co 9 S 8 /MoS 2 /Carbon fibres [25] ) have been reported. For example, Co 9 S 8 /N,P-carbon powder nanocomposites prepared by molten-salt calcination method at 900 °C exhibited an HER overpotential of 261 mV at 10 mA cm −2 in alkaline medium. [20] N-Co 9 S 8 /graphene nanocomposites was achieved Designing ever more efficient and cost-effective bifunctional electrocatalysts for oxygen/hydrogen evolution reactions (OER/HER) is greatly vital and challenging. Here, a new type of binder-free hollow TiO 2 @Co 9 S 8 core-branch arrays is developed as highly active OER and HER electrocatalysts for stable overall water splitting. Hollow core-branch arrays of TiO 2 @Co 9 S 8 are readily realized by the rational combination of crosslinked Co 9 S 8 nanoflakes on ...

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Section: Doi: 101002/advs201700772mentioning

confidence: 99%

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confidence: 99%

Hollow TiO₂@Co₉S₈ Core–Branch Arrays as Bifunctional Electrocatalysts for Efficient Oxygen/Hydrogen Production

et al. 2017

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“…This finding is corroborated by Fourier-transformed EXAFS (FT-EXAFS) spectra of MoS-CoS-Zn, MoS-CoS-Zn-1pot, and ZnS. [47] In the Co K-edge spectrum of MoS-CoS-Zn, stronger white line intensity and more positive absorption edge position are observed. The main peak of MoS-CoS-Zn-1pot at 1.9 Å is associated with Zn-S peak, which is also significant in the ZnS spectrum.…”

Section: Doi: 101002/advs201900140mentioning

confidence: 56%

Stimulated Electrocatalytic Hydrogen Evolution Activity of MOF‐Derived MoS₂ Basal Domains via Charge Injection through Surface Functionalization and Heteroatom Doping

Yilmaz

Yang

et al. 2019

Advanced Science

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The design of MoS 2 ‐based electrocatalysts with exceptional reactivity and robustness remains a challenge due to thermodynamic instability of active phases and catalytic passiveness of basal planes. This study details a viable in situ reconstruction of zinc–nitrogen coordinated cobalt–molybdenum disulfide from structure directing metal–organic framework (MOF) to constitute specific heteroatomic coordination and surface ligand functionalization. Comprehensive experimental spectroscopic studies and first‐principle calculations reveal that the rationally designed electron‐rich centers warrant efficient charge injection to the inert MoS 2 basal planes and augment the electronic structure of the inactive sites. The zinc–nitrogen coordinated cobalt–molybdenum disulfide shows exceptional catalytic activity and stability toward the hydrogen evolution reaction with a low overpotential of 72.6 mV at −10 mA cm −2 and a small Tafel slope of 37.6 mV dec −1 . The present study opens up a new opportunity to stimulate catalytic activity of the in‐plane MoS 2 basal domains for enhanced electrochemistry and redox reactivity through a “molecular reassembly‐to‐heteroatomic coordination and surface ligand functionalization” based on highly adaptable MOF template.

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“…Electrocatalytic water splitting in alkaline solution toward hydrogen evolution reaction (HER) is widely regarded as a typical process for converting electrical energy into clean and recyclable hydrogen energy . It is always a pursue goal to search for efficient electrocatalysts with a lower overpotential, efficient activity, and excellent stability to promote HER.…”

Section: Introductionmentioning

confidence: 99%

In Situ Growth of Ag Nanodots Decorated Cu₂O Porous Nanobelts Networks on Copper Foam for Efficient HER Electrocatalysis

Song

Zhao

Sun

et al. 2019

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Developing earth‐abundant electrocatalysts for high‐efficiency hydrogen evolution reaction (HER) has become one of the leading research frontiers in energy conversion. Here, the design and in situ growth of Ag nanodots decorated Cu2O porous nanobelts networks on Cu foam (denoted as Ag@Cu2O/CF) are carried out via a simple one‐pot solution strategy at room temperature. Serving as self‐supporting electrocatalysts, Ag@Cu2O porous nanobelts provide plentiful active sites, and the 3D hybrid foams provide fast transportation for electrolyte and short diffusion path for newly formed H2 bubbles, which result in excellent electrocatalytic HER activity and long‐term stability. Owing to the synergistic effect between Ag nanodots and Cu2O porous nanobelts and CF, the hybrid electrocatalyst exhibits a low Tafel slope of 58 mV dec−1, a small overpotential of 108 mV at 10 mA cm−2, and high durability for more than 20 h at a potential of 200 mV for HER in 1.0 mol L−1 KOH solution.

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Coupling Sub‐Nanometric Copper Clusters with Quasi‐Amorphous Cobalt Sulfide Yields Efficient and Robust Electrocatalysts for Water Splitting Reaction

Cited by 355 publications

References 64 publications

Hollow TiO₂@Co₉S₈ Core–Branch Arrays as Bifunctional Electrocatalysts for Efficient Oxygen/Hydrogen Production

Hollow TiO₂@Co₉S₈ Core–Branch Arrays as Bifunctional Electrocatalysts for Efficient Oxygen/Hydrogen Production

Stimulated Electrocatalytic Hydrogen Evolution Activity of MOF‐Derived MoS₂ Basal Domains via Charge Injection through Surface Functionalization and Heteroatom Doping

In Situ Growth of Ag Nanodots Decorated Cu₂O Porous Nanobelts Networks on Copper Foam for Efficient HER Electrocatalysis

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Coupling Sub‐Nanometric Copper Clusters with Quasi‐Amorphous Cobalt Sulfide Yields Efficient and Robust Electrocatalysts for Water Splitting Reaction

Cited by 355 publications

References 64 publications

Hollow TiO2@Co9S8 Core–Branch Arrays as Bifunctional Electrocatalysts for Efficient Oxygen/Hydrogen Production

Hollow TiO2@Co9S8 Core–Branch Arrays as Bifunctional Electrocatalysts for Efficient Oxygen/Hydrogen Production

Stimulated Electrocatalytic Hydrogen Evolution Activity of MOF‐Derived MoS2 Basal Domains via Charge Injection through Surface Functionalization and Heteroatom Doping

In Situ Growth of Ag Nanodots Decorated Cu2O Porous Nanobelts Networks on Copper Foam for Efficient HER Electrocatalysis

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Hollow TiO₂@Co₉S₈ Core–Branch Arrays as Bifunctional Electrocatalysts for Efficient Oxygen/Hydrogen Production

Hollow TiO₂@Co₉S₈ Core–Branch Arrays as Bifunctional Electrocatalysts for Efficient Oxygen/Hydrogen Production

Stimulated Electrocatalytic Hydrogen Evolution Activity of MOF‐Derived MoS₂ Basal Domains via Charge Injection through Surface Functionalization and Heteroatom Doping

In Situ Growth of Ag Nanodots Decorated Cu₂O Porous Nanobelts Networks on Copper Foam for Efficient HER Electrocatalysis