Highly active nickel–cobalt/nanocarbon thin films as efficient water splitting electrodes

Bayatsarmadi, Bita; Zheng, Yao; Russo, Valeria; Ge, Lei; Casari, Carlo Spartaco; Qiao, Shi Zhang

doi:10.1039/c6nr06961d

Cited by 56 publications

(21 citation statements)

References 68 publications

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“…Figure S5 (Supporting Information) shows that the Nyquist plots of both CoP/CoP 2 @NPCNTs and CoP/CoP 2 composite exhibit the two‐frequency feature. The charge‐transfer resistance of the CoP/CoP 2 @NPCNT composite generates a much smaller semicircle compared with that of its pure CoP/CoP 2 counterpart, indicative of the high electrochemical activity of the CoP/CoP 2 @NPCNT composite toward the OER . In addition, the number of active sites on the CoP/CoP 2 @NPCNT and CoP/CoP 2 electrodes was estimated on the basis of the electrochemically active surface area (EASA), which is proportional to the electrochemical double‐layer capacitance .…”

Section: Resultsmentioning

confidence: 99%

Cobalt Phosphide Composite Encapsulated within N,P‐Doped Carbon Nanotubes for Synergistic Oxygen Evolution

Yan

et al. 2018

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107

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Exploring highly efficient and stable oxygen evolution reaction (OER) electrocatalysts such as transition-metal phosphides (TMPs) is critical to advancing renewable hydrogen fuel. TMP nanostructures typically involving binary or ternary TMPs tuned by cation or anion doping are suggested to be promising low-cost and durable OER catalysts. Herein, the preparation of CoP/CoP composite nanoparticles encapsulated within N,P-doped carbon nanotubes (CoP/CoP @NPCNTs) is demonstrated as a synergistic electrocatalyst for OER via the calcination of a CoAl-layered double hydroxide/melamine mixture and subsequent phosphorization. Facile visualization by scanning electron microscopy in conjunction with electron backscatter diffraction demonstrates the encapsulation of the CoP/CoP nanoparticles within the N,P-codoped CNTs. Electrocatalytic evaluation shows that the composite electrode requires a low overpotential of 300 mV for the OER at 10 mA cm in a 1.0 m KOH solution and, in particular, exhibits an excellent long-term durability of ≈100 h, which is superior to that of the state-of-the-art RuO electrocatalyst. Density functional theory calculations reveal that the synergistic effect of CoP and CoP can enhance the electrocatalytic performance. In addition, molecular dynamics simulations demonstrate that the generated O molecules can readily diffuse out of the CNTs. Both the effects give rise to the observed OER enhancement.

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Section: Resultsmentioning

confidence: 99%

Cobalt Phosphide Composite Encapsulated within N,P‐Doped Carbon Nanotubes for Synergistic Oxygen Evolution

Yan

et al. 2018

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107

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“…Recently, great efforts have been made in enhancing the performance of nonprecious metal electrocatalysts . A specific family of metal/N‐doped carbon hybrid materials that contain N‐coordinated sites with a transition metal embedded in carbon matrix have been regarded as promising catalysts for various electrocatalytic reactions . In particular, Co or Fe/N‐doped carbon materials have been demonstrated as highly active nonprecious metal catalysts for ORR .…”

Section: Introductionmentioning

confidence: 99%

Porous Iron–Cobalt Alloy/Nitrogen‐Doped Carbon Cages Synthesized via Pyrolysis of Complex Metal–Organic Framework Hybrids for Oxygen Reduction

Guan

Lü

Wang

et al. 2018

Adv Funct Materials

231

112

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Efficient and stable nonprecious metal electrocatalysts for oxygen reduction are of great significance in some important electrochemical energy storage and conversion systems. As a unique class of porous hybrid materials, metalorganic frameworks (MOFs) and their composites are recently considered as promising precursors to derive advanced functional materials with controlled structures and compositions. Here, an "MOF-in-MOF hybrid" confined pyrolysis strategy is developed for the synthesis of porous Fe-Co alloy/N-doped carbon cages. A unique "MOF-in-MOF hybrid" architecture constructed from a Zn-based MOF core and a Co-based MOF hybrid shell encapsulated with FeOOH nanorods is first prepared, followed by a pyrolysis process to obtain a cage-shaped hybrid material consisting of Fe-Co alloy nanocrystallites evenly distributed inside a porous N-doped carbon microshell. Of note, this strategy can be extended to synthesize many other multifunctional "nanosubstratein-MOF hybrid" core-shelled structures. Benefiting from the structural and compositional advantages, the as-derived hybrid cages exhibit superior electrocatalytic performance for the oxygen reduction reaction in alkaline solution. The present approach may provide some insight in design and synthesis of complex MOF hybrid structures and their derived functional materials for energy storage and conversion applications.

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“…[2][3] However, the extensive use of expensive noble metals have raised cost of energy conversion via water splitting and thus reducing cost of them is important. [4] Though low-cost and resource abundant nanostructure non-noble metal based compounds [5][6][7][8][9][10] along with metal free carbon based electrocatalysts [11][12][13] have been developed and shown impressive electrocatalytic activity, their overall performance includes overpotential and long-run stability is still need to be further improved.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen‐doped Graphene Chainmail Wrapped IrCo Alloy Particles on Nitrogen‐doped Graphene Nanosheet for Highly Active and Stable Full Water Splitting

Zhang

et al. 2019

ChemCatChem

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Electrocatalysts have been used to split water into hydrogen and oxygen for their advantages in clean energy technologies. To reduce cost and enhance stability of electrocatalysts, intensive works have been done in recent decades. Although research on noble‐metal free electrocatalysts has achieved great progress, their full water splitting performance is still incomparable to that of noble metal based catalysts. For this reason, reducing content of noble metal in catalysts is a more practical way. In this work, we report our recent progress on developing bifunctional electrocatalyst based on nitrogen‐doped graphene chainmail wrapped IrCo alloy particles on nitrogen‐doped graphene (NG@IrCo/NG). Benefited from strong interaction among iridium, cobalt and nitrogen‐doped graphene, impressively high electrocatalytic activity of hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in both acid and alkaline solutions, which are comparable to commercially used Pt/C and IrO2 electrocatalysts respectively, is found. Catalyst with the structure of nitrogen doped chainmail wrapping on metal core is found to have highly stable full water splitting performance.

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Highly active nickel–cobalt/nanocarbon thin films as efficient water splitting electrodes

Cited by 56 publications

References 68 publications

Cobalt Phosphide Composite Encapsulated within N,P‐Doped Carbon Nanotubes for Synergistic Oxygen Evolution

Cobalt Phosphide Composite Encapsulated within N,P‐Doped Carbon Nanotubes for Synergistic Oxygen Evolution

Porous Iron–Cobalt Alloy/Nitrogen‐Doped Carbon Cages Synthesized via Pyrolysis of Complex Metal–Organic Framework Hybrids for Oxygen Reduction

Nitrogen‐doped Graphene Chainmail Wrapped IrCo Alloy Particles on Nitrogen‐doped Graphene Nanosheet for Highly Active and Stable Full Water Splitting

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