Developing transition-metal-based electrocatalysts for the oxygen evolution reaction (OER) with enhanced activities is a feasible strategy to enable the renewable energy conversion. We report here an Fe-doped nickel telluride–nickel phosphide...

Efficient water oxidation using an Fe-doped nickel telluride–nickel phosphide electrocatalyst by partial phosphating

In situ electrochemical dehydrogenation of ultrathin Co(OH)2 nanosheets for enhanced hydrogen evolution

Ranging from structure to property, the design of reasonable structures leading to high-performance electrochemical properties has enabled metal–organic frameworks (MOFs) to have great achievement in energy conversion. Since Co(II) has multiple valence states and is especially abundant, CoMOFs have emerged as latent materials of electrocatalysts in overall water splitting. In fact, CoMOFs/carbon-based hybrid materials (Co/CHMs) exhibit all kinds of architectures, marvelous electrochemical capabilities, and synergistic effects, overcoming the relative insulation of CoMOFs and single structure carbon materials. The synergistic effect of CoMOFs-based materials and carbon materials forming a unique interface can increase the specific surface area and accelerate electron transfer rates, resulting in enhanced overall water splitting. In terms of this review, the various Co/CHMs (carbon = GO/RGO, CNT, and carbon black) are summarized. The relationship between the synergistic effect of Co/CHMs and the activity of overall water splitting is discussed. Finally, this review can supply a certain degree of reference for Co/CHMs as electrocatalysts in the field of overall water splitting and a number of helpful comments for prospective energy materials. 

Compositional Engineering of Co(II)MOF/Carbon-Based Overall Water Splitting Electrocatalysts: From Synergistic Effects to Structure–Activity Relationships

Controlled synthesis of Fe doped NiCoM (M=O, P, S and Se) as robust electrocatalyst for urea electrolysis

Recent progress of metal-organic framework-derived composites: Synthesis and their energy conversion applications

Porous N-doped carbon with confined Fe-doped CoP grown on CNTs for superefficient oxygen evolution electrocatalysis.

As the core of an electrocatalyst, the active site is critical to determine its catalytic performance in the hydrogen evolution reaction (HER). In this work, porous N-doped carbon-encapsulated CoP nanoparticles on both sides of graphene (CoP@NC/GR) are derived from a bimetallic metal-organic framework (MOF)@graphene oxide composite. Through active site engineering by tailoring the environment around CoP and engineering the structure, the HER activity of CoP@NC/GR heterostructures is significantly enhanced. Both X-ray photoelectron spectroscopy (XPS) results and density functional theory (DFT) calculations manifest that the electronic structure of CoP can be modulated by the carbon matrix of NC/GR, resulting in electron redistribution and a reduction in the adsorption energy of hydrogen (ΔGH*) from -0.53 to 0.04 eV. By engineering the sandwich-like structure, active sites in CoP@NC/GR are further increased by optimizing the Zn/Co ratio in the bimetallic MOF. Benefiting from this active site engineering, the CoP@NC/GR electrocatalyst exhibits small overpotentials of 105 mV in 0.5 M H2SO4 (or 125 mV in 1 M KOH) to 10 mA cm-2, accelerated HER kinetics with a low Tafel slope of 47.5 mV dec-1, and remarkable structural and HER stability.

Active Site Engineering in CoP@NC/Graphene Heterostructures Enabling Enhanced Hydrogen Evolution.

Enhanced Electrocatalytic Activity and Ultrasensitive Enzyme-Free Glucose Sensing Based on Heterogeneous Co(OH)2 Nanosheets/CuO Microcoral Arrays via Interface Engineering

To design multi-heterointerfaces for doping-type electrocatalysts is a promising strategy to synergistically balance the catalytic activity/durability. In this study, we report a dual-MOFs/MXene composite derivation strategy to construct porous N-doped carbon encapsulating Fe-doped CoSe2 on both sides of MXene (Fe-CoSe2@PNC/TC). Combining multi-characterizations and density functional theory calculations, the Fe doping and well-designed multi-interfaces can induce the internal Se vacancy and electronic structure modulation, increasing and enhancing the active sites and, thus, reducing energy barriers for oxygen evolution reaction (OER). Thereby, the OER activities of Fe-CoSe2@PNC/TC powder materials have been significantly improved, which exhibits an overpotential of only 244 mV to attain 10 mA cm−2 with the long-term durability and a ultra-small Tafel slope of 41.1 mV dec−1 in 1.0 M KOH electrolyte (No IR correction), far outperforming the benchmark of commercial IrO2. This work proposes a controllable route combining multi-interface design and heteroatom doping for ultra-efficient OER electrocatalysis.

Yuxi Yuan

Papers

Porous N-doped carbon with confined Fe-doped CoP grown on CNTs for superefficient oxygen evolution electrocatalysis.

Active Site Engineering in CoP@NC/Graphene Heterostructures Enabling Enhanced Hydrogen Evolution.

Enhanced Electrocatalytic Activity and Ultrasensitive Enzyme-Free Glucose Sensing Based on Heterogeneous Co(OH)2 Nanosheets/CuO Microcoral Arrays via Interface Engineering

Reducing energy barriers by multi-interface design on MXene with confined Fe-doped CoSe2 for ultra-efficient OER electrocatalysis