3D multi-structural porous NiAg films with nanoarchitecture walls: high catalytic activity and stability for hydrogen evolution reaction

Yu, Xiangtao; Wang, Mingyong; Wang, Zhi; Gong, Xuzhong; Guo, Zhancheng

doi:10.1016/j.electacta.2016.06.062

Cited by 46 publications

(29 citation statements)

References 56 publications

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“…To understand the synergistic effect between Co 2 P and Co 3 O 4 phases on the enhanced catalytic activity for OER, the dual‐phase Co 2 P–Co 3 O 4 in the outer layer of CoP‐400‐IO film was analyzed by X‐ray photoelectron spectroscopy (XPS) (Figure S14, Supporting Information). Compared with the CoP‐DO film, the binding energy of Co 2p decreased in CoP‐400‐IO film (Figure S14a, Supporting Information), which was similar to the previous works . Co element in Co 2 P phase donated electrons to Co 3 O 4 phase, which led to the negative shift of Co binding energy and may improve the catalytic activity of CoP‐400‐IO films for OER .…”

Section: Resultssupporting

confidence: 85%

“…Compared with the CoP‐DO film, the binding energy of Co 2p decreased in CoP‐400‐IO film (Figure S14a, Supporting Information), which was similar to the previous works . Co element in Co 2 P phase donated electrons to Co 3 O 4 phase, which led to the negative shift of Co binding energy and may improve the catalytic activity of CoP‐400‐IO films for OER . In addition, two satellite peaks for the Co 2+ oxidation state appeared at about 786.3 and 802.9 eV for CoP‐400‐IO film.…”

Section: Resultssupporting

confidence: 84%

“…Furthermore, hierarchically porous structure should be well designed to create more active sites and improve the wettability . The activity can be enhanced due to rapid ion/electron transfer and bubble separation . Thus, the self‐supported electrocatalysts with hierarchically porous structure for overall water splitting must be developed to meet industrial application at a large current density (>400 mA cm −2 ).…”

Section: Introductionmentioning

confidence: 99%

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Self‐Supporting Porous CoP‐Based Films with Phase‐Separation Structure for Ultrastable Overall Water Electrolysis at Large Current Density

Wang

Gong

et al. 2018

Advanced Energy Materials

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126

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Stable non-noble metal electrocatalysts are of essential importance for industrial water electrolysis. Powdery electrocatalysts loaded on current collectors by binders are often designed, but easily fall off due to strong attack by bubbles at an industrial large current density (>400 mA cm −2 ). A novel strategy is developed to construct a self-supported dual-phase porous Co 2 P-Co 3 O 4 film for oxygen evolution reaction (OER) and micro-nanoporous Co 2 P film for hydrogen evolution reaction (HER) based on the electrodeposition of single-phase porous CoP film on gas-liquid-solid interface, phase separation to Co 2 P-Co, and selective oxidation/etching of the Co phase. The self-supported dual-phase Co 2 P-Co 3 O 4 catalyst exhibits good electrocatalytic activity for OER. The overpotentials are 265 and 405 mV at 20 and 200 mA cm −2 , respectively. In addition, the self-supported micro-nanoporous Co 2 P catalyst shows high catalytic activity for HER due to large active area and good wettability. Both dual-phase Co 2 P-Co 3 O 4 and micro-nanoporous Co 2 P possess ultrastability, even at a large current density of 500 mA cm −2 due to the self-supported structure. The cell voltage of water electrolysis using a self-supported Co 2 P-Co 3 O 4 ||Co 2 P electrolyzer at 500 mA cm −2 is only about 3.36 ± 0.01 V, which is much lower than that (4.31 ± 0.05 V) of the IrO 2 -Ta 2 O 5 ||Pt electrolyzer.

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Section: Resultssupporting

confidence: 85%

Section: Resultssupporting

confidence: 84%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Self‐Supporting Porous CoP‐Based Films with Phase‐Separation Structure for Ultrastable Overall Water Electrolysis at Large Current Density

Wang

Gong

et al. 2018

Advanced Energy Materials

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126

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“…At the same time, the initiation of hydrogen bubbles on the deposit side wall would contribute to the evolution of dendritic structures. Other metals, such as Ni, [100] Co, [101] Sn, [94] Ag, [102] Au, [103] Ru, [104] Pd, [105][106][107] and a series of bimetallic porous nanostructures have also been prepared by the HBDT method, including Cu-Ni, [108][109][110] Cu-Au, [111] Cu-Pd, [112] Cu-Ag, [111] Cu-Ru, [113] Cu-Pt, [114,115] Ni-Sn, [116,117] Ni-Co, [118] Ni-Mo, [119] Ni-Ag, [120] Pt-Ag, [121] and Pt-Pd. [115] Figure 6d gives a typical SEM image of the porous Ni 50 Sn 50 alloy with the tubelike dendritic structure, whose tube diameter is less than 100 nm and the length of dendritic branches is about 5 µm.…”

Section: Hydrogen Bubble Dynamic Template (Hbdt) Depositionmentioning

confidence: 99%

Hierarchical Nanostructures: Design for Sustainable Water Splitting

Fang

Dong

Wei

et al. 2017

Advanced Energy Materials

279

190

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Clean and sustainable hydrogen generation renders a magnificent prospect to fulfill the humans' dream of rebuilding energy supplying systems that work eternally and run without pollution. Water electrolysis driven by a renewable resource of energy, such as wind and solar, is a promising pathway to achieve this goal, which requires highly active and cost‐effective electrode materials to be developed. In this comprehensive review, we introduce the utilization of hierarchical nanostructures in electrocatalytic and photoelectrochemical applications. The unique emphasis is given on the synthetic strategies of attaining these hierarchical structures as well as to demonstrate their corresponding mechanisms for performance improvement. Rather than simply discussing all the methods that can be used in nanofabrication, we focus on extracting the rules for structural design based on highly accessible and reliable methods. Examples are given to illustrate the versatility of these methods in the synthesis and manipulation of hierarchical nanostructures, which are concentrated on nonprecious transition metals or their alloys/compounds. Through this study, we aim to establish valuable guidelines and provide further insights for researchers to facilitate their design of more efficient water splitting systems in the future.

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“…The alloying of Pt with some secondary metals offers a great opportunity to enhance the electro-catalytic performance due to the changes in the geometric and electronic structures of Pt. [13][14] On the other hand, the catalytic performance also depends on the surface area of catalysts, which could be improved by generating hollow or porous structures. 15 For instance, Pt3Ni nanocrystals with a porous feature were demonstrated very efficient for oxygen reduction reaction.…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis of Porous Pt-Cu Alloy with Enhanced Catalytic Activity

Li¹,

Su²,

Li³

et al. 2018

Preprint

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Cost-efficient catalyst for hydrogen evolution reaction (HER) and methanol oxidization reaction (MOR) is of great importance for industrial application. The alloying of platinum with cheap transition metal offers a great opportunity to reduce cost and enhance the electro-catalytic performance. Herein, we report a simple and green route to synthesize porous Pt-Cu catalysts, where Pt-Cu solid particles were first produced by using cuprous chloride (CuCl) nanoparticles as the template, followed by a dealloying treatment to obtain final porous product. The porous alloy nanoparticles show higher catalytic activity and superior stability for HER and methanol oxidation reaction, which is beneficial from the porous structure and synergetic effect between Pt and Cu.

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3D multi-structural porous NiAg films with nanoarchitecture walls: high catalytic activity and stability for hydrogen evolution reaction

Cited by 46 publications

References 56 publications

Self‐Supporting Porous CoP‐Based Films with Phase‐Separation Structure for Ultrastable Overall Water Electrolysis at Large Current Density

Self‐Supporting Porous CoP‐Based Films with Phase‐Separation Structure for Ultrastable Overall Water Electrolysis at Large Current Density

Hierarchical Nanostructures: Design for Sustainable Water Splitting

Facile Synthesis of Porous Pt-Cu Alloy with Enhanced Catalytic Activity

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