Construction of Efficient 3D Gas Evolution Electrocatalyst for Hydrogen Evolution: Porous FeP Nanowire Arrays on Graphene Sheets

Yan, Ya; Thia, Larissa; Xia, Bao Yu; Ge, Xiaoming; Liu, Zhaolin; Fisher, Adrian C.; Wang, Xin

doi:10.1002/advs.201500120

Cited by 167 publications

(95 citation statements)

References 64 publications

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“…That is to say, the PC/PG may be the minor active phase while the mixed‐phase CoP‐Co 2 P is the main active component. Except for contributing a certain activity, the main role of PC/PG may be as follows: (1) enhancing the conductivity of CoP‐Co 2 P due to good conductivity of carbon‐based materials; (2) alleviating or depleting the redox stress during the electrochemical cycles helps to improve the catalytic stability of the NHs . Strictly speaking, the observed excellent catalytic performance of CoP‐Co 2 P@PC/PG NHs may result from the synergistic catalysis of mixed‐phase CoP‐Co 2 P and PC/PG.…”

Section: Resultsmentioning

confidence: 99%

Cobalt Phosphides Nanocrystals Encapsulated by P‐Doped Carbon and Married with P‐Doped Graphene for Overall Water Splitting

Yang

Guo

Zhao

et al. 2019

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123

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As one class of important functional materials, transition metal phosphides (TMPs) nanostructures show promising applications in catalysis and energy storage fields. Although great progress has been achieved, phase‐controlled synthesis of cobalt phosphides nanocrystals or related nanohybrids remains a challenge, and their use in overall water splitting (OWS) is not systematically studied. Herein, three kinds of cobalt phosphides nanocrystals encapsulated by P‐doped carbon (PC) and married with P‐doped graphene (PG) nanohybrids, including CoP@PC/PG, CoP‐Co2P@PC/PG, and Co2P@PC/PG, are obtained through controllable thermal conversion of presynthesized supramolecular gels that contain cobalt salt, phytic acid, and graphene oxides at proper temperature under Ar/H2 atmosphere. Among them, the mixed‐phase CoP‐Co2P@PC/PG nanohybrids manifest high electrocatalytic activity toward both hydrogen and oxygen evolution in alkaline media. Remarkably, using them as bifunctional catalysts, the fabricated CoP‐Co2P@PC/PG||CoP‐Co2P@PC/PG electrolyzer only needs a cell voltage of 1.567 V for driving OWS to reach the current density at 10 mA cm−2, superior to their pure‐phase counterparts and recently reported bifunctional catalysts based devices. Also, such a CoP‐Co2P@PC/PG||CoP‐Co2P@PC/PG device exhibits outstanding stability for OWS. This work may shed some light on optimizing TMPs nanostructures based on phase engineering, and promote their applications in OWS or other renewable energy options.

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Section: Resultsmentioning

confidence: 99%

Cobalt Phosphides Nanocrystals Encapsulated by P‐Doped Carbon and Married with P‐Doped Graphene for Overall Water Splitting

Yang

Guo

Zhao

et al. 2019

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123

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“…Figure 5b demonstrates a representative SEM image of FeP nanowire arrays vertically supported on reduced graphene oxide (rGO) fabricated by pseudomorphoic transformation of hydrothermally synthesized FeO(OH) NWs/GO precursors. [90] Owing to the improved electrode/electrolyte interaction and the efficient utilization of the catalysts, the 3D FeP NWs/rGO electrocatalyst exhibits the enhanced HER performance and better stability than FeP NWs assemblies and FeP nanoparticles on reduced graphene oxide (NPs/rGO). In addition to nanoscale 1D and 2D substrates, conductive microporous substrates such carbon fiber papers (CFP) and nickel foam (NF) have also been frequently utilized to fabricate binder-free, monolithic and 3D hierarchical architectures for electrocatalytic applications.…”

Section: Support/templated Synthesismentioning

confidence: 99%

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

284

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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“…There are three general approaches to construct pores in electrodes. [33][34][35][36] Zhao and coworkers electrodeposited NiFe thin films on nickel foam by a potentiostatic technique. There are typicallyt wo general strategies for the preparation of materials with constructionalvoids.…”

Section: Porous Materials As Electrocatalystsmentioning

confidence: 99%

Porous Materials as Highly Efficient Electrocatalysts for the Oxygen Evolution Reaction

Zhang

Cao

2018

ChemCatChem

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Carbon‐neutral hydrogen has potential to alleviate the energy crisis and ease environmental problems. Water electrolysis is a sustainable way for large‐scale hydrogen production when electricity is generated from renewable energy resources. The key challenge in water splitting is the sluggish kinetics of the oxygen evolution reaction (OER). Thus, it is important and necessary to develop highly efficient electrocatalysts in a cost‐effective way for OER. Porous materials have proven to be versatile in catalysis due to their large surface area, the fast mass diffusion, and the buffer ability of volume change. Herein, we summarize the recent progress of representative methodologies for the synthesis of porous materials toward electrocatalytic OER. The materials discussed in this Review include the cheap transition‐metal‐based (Co, Ni, and Fe) and metal‐free porous materials. This Review sheds light on the different strategies to construct catalysts with porous structures to facilitate OER.

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Construction of Efficient 3D Gas Evolution Electrocatalyst for Hydrogen Evolution: Porous FeP Nanowire Arrays on Graphene Sheets

Cited by 167 publications

References 64 publications

Cobalt Phosphides Nanocrystals Encapsulated by P‐Doped Carbon and Married with P‐Doped Graphene for Overall Water Splitting

Cobalt Phosphides Nanocrystals Encapsulated by P‐Doped Carbon and Married with P‐Doped Graphene for Overall Water Splitting

Hierarchical Nanostructures: Design for Sustainable Water Splitting

Porous Materials as Highly Efficient Electrocatalysts for the Oxygen Evolution Reaction

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