Since the discovery of mechanically exfoliated graphene in 2004, research on ultrathin two-dimensional (2D) nanomaterials has grown exponentially in the fields of condensed matter physics, material science, chemistry, and nanotechnology. Highlighting their compelling physical, chemical, electronic, and optical properties, as well as their various potential applications, in this Review, we summarize the state-of-art progress on the ultrathin 2D nanomaterials with a particular emphasis on their recent advances. First, we introduce the unique advances on ultrathin 2D nanomaterials, followed by the description of their composition and crystal structures. The assortments of their synthetic methods are then summarized, including insights on their advantages and limitations, alongside some recommendations on suitable characterization techniques. We also discuss in detail the utilization of these ultrathin 2D nanomaterials for wide ranges of potential applications among the electronics/optoelectronics, electrocat...

Recent Advances in Ultrathin Two-Dimensional Nanomaterials

Recent progress in alkaline water electrolysis for hydrogen production and applications

We report new insights into the electrochemical reduction of CO2 on a metallic copper surface, enabled by the development of an experimental methodology with unprecedented sensitivity for the identification and quantification of CO2 electroreduction products. This involves a custom electrochemical cell designed to maximize product concentrations coupled to gas chromatography and nuclear magnetic resonance for the identification and quantification of gas and liquid products, respectively. We studied copper across a range of potentials and observed a total of 16 different CO2 reduction products, five of which are reported here for the first time, thus providing the most complete view of the reaction chemistry reported to date. Taking into account the chemical identities of the wide range of C1–C3 products generated and the potential-dependence of their turnover frequencies, mechanistic information is deduced. We discuss a scheme for the formation of multicarbon products involving enol-like surface intermediates as a possible pathway, accounting for the observed selectivity for eleven distinct C2+ oxygenated products including aldehydes, ketones, alcohols, and carboxylic acids.

New insights into the electrochemical reduction of carbon dioxide on metallic copper surfaces

Over the past few decades, the design and development of advanced electrocatalysts for efficient energy conversion technologies have been subjects of extensive study. With the discovery of graphene, two-dimensional (2D) nanomaterials have emerged as some of the most promising candidates for heterogeneous electrocatalysts due to their unique physical, chemical, and electronic properties. Here, we review 2D-nanomaterial-based electrocatalysts for selected electrocatalytic processes. We first discuss the unique advances in 2D electrocatalysts based on different compositions and functions followed by specific design principles. Following this overview, we discuss various 2D electrocatalysts for electrocatalytic processes involved in the water cycle, carbon cycle, and nitrogen cycle from their fundamental conception to their functional application. We place a significant emphasis on different engineering strategies for 2D nanomaterials and the influence these strategies have on intrinsic material performance, ...

Emerging Two-Dimensional Nanomaterials for Electrocatalysis

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Heterostructures for Electrochemical Hydrogen Evolution Reaction: A Review

On the kinetics of the hydrogen evolution reaction on nickel in alkaline solution. Part I. The mechanism

On the kinetics of the hydrogen evolution reaction on nickel in alkaline solution - Part II. Effect of temperature

The kinetics of the hydrogen evolution reaction on zinc in EDTA solutions in the pH 3 /10 range

The kinetics of the chemical polymerization of pyrrole by potassium hexacyanoferrate(III) in water at 0°C was studied. The order of the reaction with respect to both pyrrole and potassium hexacyanoferrate(III) was determined to be 1 and 2,6, respectively. The rate constant k of the polymerization reaction was found to be 2,25.10 -4 (dm 3 .mol -1 ) 2,6 .s -1

M. Vojnović

Papers

On the kinetics of the hydrogen evolution reaction on nickel in alkaline solution. Part I. The mechanism

On the kinetics of the hydrogen evolution reaction on nickel in alkaline solution - Part II. Effect of temperature

The kinetics of the hydrogen evolution reaction on zinc in EDTA solutions in the pH 3 /10 range

Kinetics of the chemical polymerization of pyrrole by potassium hexacyanoferrate(III)

Hydrogen Evolution Reaction from EDTA Solutions