Journal ArticleDOI
Controllable Synthesis of Ordered Mesoporous Mo2C@Graphitic Carbon Core–Shell Nanowire Arrays for Efficient Electrocatalytic Hydrogen Evolution
Jiahui Zhu,Yan Yao,Zhi Chen,Aijian Zhang,Mengyuan Zhou,Jun Guo,Winston Duo Wu,Xiao Dong Chen,Yanguang Li,Zhangxiong Wu +9 more
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TLDR
Novel ordered mesoporous core-shell nanowires with Mo2C cores and ultrathin graphitic carbon (GC) shells are rationally synthesized and demonstrated to be excellent for HER.Abstract:
Mo2C is a possible substitute to Pt-group metals for electrocatalytic hydrogen evolution reaction (HER). Both support-free and carbon-supported Mo2C nanomaterials with improved HER performance have been developed. Herein, distinct from prior research, novel ordered mesoporous core-shell nanowires with Mo2C cores and ultrathin graphitic carbon (GC) shells are rationally synthesized and demonstrated to be excellent for HER. The synthesis is fulfilled via a hard-templating approach combining in situ carburization and localized carbon deposition. Phosphomolybdic acid confined in the SBA-15 template is first converted to MoO2, which is then in situ carburized to Mo2C nanowires with abundant surface defects. Simultaneously, GC layer (the thickness is down to ∼1.0 nm in most areas) is controlled to be locally deposited on the Mo2C surface because of its strong affinity with carbon and catalytic effect on graphitization. Removal of the template results in the Mo2C@GC core-shell nanowire arrays with the structural properties well-characterized. They exhibit excellent performance for HER with a low overpotential of 125 mV at 10 mA cm-2, a small Tafel slope of 66 mV dec-1, and an excellent stability in acidic electrolytes. The influences of several factors, especially the spatial configuration and relative contents of the GC and Mo2C components, on HER performance are elucidated with control experiments. The excellent HER performance of the mesoporous Mo2C@GC core-shell nanowire arrays originates from the rough Mo2C nanowires with diverse active sites and short charge-transfer paths and the ultrathin GC shells with improved surface area, electronic conductivity, and stabilizing effect on Mo2C.read more
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Journal ArticleDOI
Molybdenum Carbide-Oxide Heterostructures: In Situ Surface Reconfiguration toward Efficient Electrocatalytic Hydrogen Evolution.
TL;DR: Heterostructured Mo 2 C-MoO x on carbon cloth, as a model of easily oxidized electrocatalysts under ambient conditions, is investigated to uncover surface reconfiguration during hydrogen evolution reaction (HER), and consistent in-situ surface reconfigured and promotion are proved.
Journal ArticleDOI
Carbon-Encapsulated Electrocatalysts for the Hydrogen Evolution Reaction
TL;DR: A review of carbon-encapsulated materials for the hydrogen evolution reaction (HER) is presented in this paper, with a focus on the unique effects of carbon shells, and perspectives on the future development of carboncoated electrocatalysts for the HER are provided.
Journal ArticleDOI
Surface engineering by doping manganese into cobalt phosphide towards highly efficient bifunctional HER and OER electrocatalysis
Maosen Wang,Maosen Wang,Fu Wenying,Lei Du,Yong-Sheng Wei,Peng Rao,Lu Wei,Xinsheng Zhao,Yun Wang,Shuhui Sun +9 more
TL;DR: In this article, MnCoP nanosheets are designed and constructed by doping Mn into CoP via direct one-step electrodeposition on carbon cloth, which can not only modify the surface electronic structure of CoP, but also enhance electrochemical surface area (ECSA) to expose more accessible active sites, and increase the intrinsic activity for HER and OER.
Journal ArticleDOI
Phosphorized MXene-Phase Molybdenum Carbide as an Earth-Abundant Hydrogen Evolution Electrocatalyst
Guoxing Qu,Guoxing Qu,Yang Zhou,Yang Zhou,Tianli Wu,Tianli Wu,Guoliang Zhao,Fangfang Li,Yijin Kang,Yijin Kang,Chen Xu +10 more
TL;DR: In this article, a new family of potential electrocatalysts called MXenes with good conductivity and hydrophilicity is proposed. But pristine MXenes usually show unsatisfactory catalytic activi...
Journal ArticleDOI
Recent advances of porous transition metal-based nanomaterials for electrochemical energy conversion and storage applications
TL;DR: In this article, the authors systematically discuss the recent achievements in the typical oxides, sulfide, phosphide and carbrides of PTMNs for electrochemical energy storage and conversion.
References
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Journal ArticleDOI
Triblock copolymer syntheses of mesoporous silica with periodic 50 to 300 angstrom pores
Dongyuan Zhao,Jianglin Feng,Qisheng Huo,Nicholas A. Melosh,Glenn H. Fredrickson,Bradley F. Chmelka,Galen D. Stucky +6 more
TL;DR: Use of amphiphilic triblock copolymers to direct the organization of polymerizing silica species has resulted in the preparation of well-ordered hexagonal mesoporous silica structures (SBA-15) with uniform pore sizes up to approximately 300 angstroms.
Journal ArticleDOI
Identification of active edge sites for electrochemical H2 evolution from MoS2 nanocatalysts.
Thomas F. Jaramillo,Kristina Pilt Jørgensen,Jacob Lindner Bonde,Jane Hvolbæk Nielsen,Sebastian Horch,Ib Chorkendorff +5 more
TL;DR: The active site for hydrogen evolution, a reaction catalyzed by precious metals, on nanoparticulate molybdenum disulfide (MoS2) is determined by atomically resolving the surface of this catalyst before measuring electrochemical activity in solution.
Journal ArticleDOI
MoS2 Nanoparticles Grown on Graphene: An Advanced Catalyst for the Hydrogen Evolution Reaction
TL;DR: In this article, a selective solvothermal synthesis of MoS2 nanoparticles on reduced graphene oxide (RGO) sheets suspended in solution was developed, which exhibited superior electrocatalytic activity in the hydrogen evolution reaction (HER).
Journal ArticleDOI
Noble metal-free hydrogen evolution catalysts for water splitting
Xiaoxin Zou,Yu Zhang +1 more
TL;DR: This review highlights the recent research efforts toward the synthesis of noble metal-free electrocatalysts, especially at the nanoscale, and their catalytic properties for the hydrogen evolution reaction (HER), and summarizes some important examples showing that non-Pt HER electrocatsalysts could serve as efficient cocatalysts for promoting direct solar-to-hydrogen conversion in both photochemical and photoelectrochemical water splitting systems, when combined with suitable semiconductor photocatalyst.
Journal ArticleDOI
Computational high-throughput screening of electrocatalytic materials for hydrogen evolution
TL;DR: A density functional theory-based, high-throughput screening scheme that successfully uses these strategies to identify a new electrocatalyst for the hydrogen evolution reaction (HER), which is found to have a predicted activity comparable to, or even better than, pure Pt, the archetypical HER catalyst.