Interfacial electronic structure modulation of CoP nanowires with FeP nanosheets for enhanced hydrogen evolution under alkaline water/seawater electrolytes

Yang

et al. 2023

J. Mater. Chem. A

Self Cite

Section: Resultsmentioning

confidence: 99%

Manipulating the interaction of Pt NPs with N-hollow carbon spheres by F-doping for boosting oxygen reduction/methanol oxidation reactions

Yang

et al. 2023

J. Mater. Chem. A

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“…Taking the previous work of FeP@CoP nanoarrays as an example, it displays enhanced HER catalytic compared with FeP and CoP. Bene ting from the controllable electronic state manipulation at interface region, the interfacial active center exhibits much smaller H* adsorption energy (-0.01 eV) than single-phased CoP (-1.28 eV) and FeP (-0.58 eV), as well as lower H 2 O dissolution energy barrier [10]. Therefore, the incorporation of appropriate agents to build TMPs heterogeneous interface is a worthy method to motivate HER electrocatalytic performance [11].…”

Section: Introductionmentioning

confidence: 99%

Construction of Interface-Engineered Coral-like Ni2P@CeO2 Hybrid Nanoarrays to Boost Electrocatalytic Hydrogen Evolution Performance in alkaline water/seawater electrolytes

Lyu

Wang

et al. 2023

Preprint

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Fabricating a functional heterogeneous interface to enhance the catalytic performance is quite significant for developing high-efficient electrocatalysts. Herein, we designed a coral-like Ni2P@CeO2 hybrid nanoarrays on nickel foam via selective-phosphorization of Ni(OH)2@CeO2. Benefiting from CeO2 as the “electron pump”, it leads to electrons transfer from Ni2P to CeO2 side, and induces the electrons redistribution in interface boundary, thereby optimizing the H* adsorption free energy in HER process. As proposed, owing to the superior affinity to oxygen-containing species of CeO2, the H2O molecule will preferentially adsorb on CeO2 side, and easily decompose into OH* and H* with lower energy barrier. Subsequently, benefiting from the lower H* adsorption free energy of P sites, the generated H* will transfer to Ni2P side through spillover process. Contributing to the synergistic effect of double-active sites, the Ni2P@CeO2/NF electrode exhibits brilliant catalytic performance for HER with 62 mV to attain 10 mA/cm2 and exceptional durability over 100 h in 1 M KOH solution under ~ 100 mA/cm2. Meanwhile, attributing to the similar interface electrons redistribution effect, the precursor Ni(OH)2@CeO2/NF also displays excellent OER electrocatalytic performance, it only requires 229 mV to arrive 10 mA/cm2, even better than benchmark RuO2. Hence, the assembled Ni(OH)2@CeO2/NF||Ni2P@CeO2/NF system only needs 1.53 V to achieve 10 mA/cm2 in basic solution. Moreover, the electrolyzer also presents brilliant electrocatalytic activity and stability in natural seawater alkaline electrolyte with higher reserves on earth. This research offers a novel insight to enhance the catalytic properties of TMPs materials for hydrogen production.

“…12 Furthermore, nano-sized catalysts can often be anchored directly on the skeleton surface of NF through in situ growth, which avoids the usage of polymeric binders of poor conductivities. 42 In addition to the strong mechanical stability, direct anchoring of catalysts on NF not only improves the mechanical adhesion and electrical contact between the catalyst and NF but also drastically enhances the stability of the resulting electrode during the HER process to resist violent gas bubbling during high current operations. 43 Although a great deal of efforts have been devoted to develop electrocatalysts for HER, it remains a difficult task to design and prepare non-precious transition metal-based electrocatalysts with Pt-like pH-universal HER activities and promising long-term durability at commercially viable current densities (∼500 mA cm −2 ), considering the significantly lower durability of Pt-based electrocatalysts, especially at high current densities.…”

Section: Introductionmentioning

confidence: 99%

“…In this regard, nickel foam (NF) is an excellent choice for its good electrical conductivities, considerable HER activities, excellent stability in alkaline and neutral electrolytes, 3D porous structure, low cost, and high surface areas . Furthermore, nano-sized catalysts can often be anchored directly on the skeleton surface of NF through in situ growth, which avoids the usage of polymeric binders of poor conductivities . In addition to the strong mechanical stability, direct anchoring of catalysts on NF not only improves the mechanical adhesion and electrical contact between the catalyst and NF but also drastically enhances the stability of the resulting electrode during the HER process to resist violent gas bubbling during high current operations .…”

Section: Introductionmentioning

confidence: 99%

NiMo-MOF-Derived Carbon-Armored Ni₄Mo Alloy of an Interwoven Nanosheet Structure as an Outstanding pH-Universal Catalyst for Hydrogen Evolution Reaction at High Current Densities

Raja

ACS Appl. Mater. Interfaces

Ting

et al. 2023

Development of highly efficient and stable non-precious metal-based pH-universal catalysts for hydrogen evolution reaction (HER) at high current densities remains challenging for water electrolysis-based green hydrogen production. Herein, a simple solvothermal process was developed to synthesize a NiMo metal–organic framework (MOF), from which a carbon-armored Ni4Mo alloy of an interwoven nanosheet structure was derived with a two-stage thermal treatment, to serve as a high-performance pH-universal HER catalyst. It requires low overpotentials of 22, 48, and 98 mV to achieve a current density of −10 mA cm–2 and 192, 267, and 360 mV to deliver an ultrahigh current density of −500 mA cm–2 in alkaline, acidic, and neutral media, respectively, and exhibits remarkable operational stability at an ultrahigh initial current density of −500 mA cm–2 for over 50 h, making it promising for applications in large-scale green hydrogen production. The success can be attributed to the unique catalyst design of a carbon-armored, composition-optimized NiMo alloy of an advantageous nanostructure of interwoven nanosheets for enhanced utilization of active sites and mass transfer of electrolytes and gaseous products, made possible with a MOF-derivation fabrication approach.