Nanofibrillar hydrogels outperform Pt/C for hydrogen evolution reactions under high-current conditions

Abstract

To achieve efficient hydrogen production, researchers have focused on the development of various electrocatalysts using noble and certain transition metal elements; however, concerns regarding their sustainability are growing. Here, we...

Ligand-Exchange-Assisted Layer-by-Layer Assembly of Au–Pt Bimetallic Nanocomposite Films and Their Electrocatalytic Activities for Hydrogen Evolution Reaction

“…The XPS spectra showed reduction of Pt 2+ and N–C peaks for the samples after 2000 cycles (Figure S17c–e), also indicating coalescence and disintegration of the nanoparticles. , Such deterioration can be attributed to degradation of stability with partial dissolution for Au and Pt under acidic condition with prolonged electrochemical tests. − In the chronoamperometry test at −0.1 V, initial current density of the AuPt10 electrode was corresponded well to the value measured at LSV. However, the current densities got gradually decreased due to the deterioration and physical loss, accompanied by H 2 bubble detachment, of catalysts. − …”

Tailoring hydrophilic and hydrophobic microenvironments for gas–liquid–solid triphase electrochemical reactions

“…It is noteworthy that a smaller water contact angle ( θ w ) or a larger air contact angle ( θ a ) leads to a smaller F γ , promoting bubble detachment. Table 1 summarizes recent studies 42,43,54–67 reporting air contact angles and adhesion forces measured in gas-evolving systems. It is important to note that in most cases, electrodes exhibit superaerophobicity ( θ a > 150°) and low adhesion forces (<10 μN).…”

“…16a–e). 58,60,63 As a proof-of-concept demonstration, they prepared hydrogels by chemically crosslinking amine-rich M13 bacteriophage via Schiff-base condensation reactions with glutaraldehyde (Fig. 16a).…”

“…16f) and obtained greatly improved HER performance under alkaline conditions, demonstrating the versatility of the hydrogel strategy regardless of the electrode morphology and pHs. 63 Notably, the hydrogel-coated NiF (HG–NiF) electrodes without additional HER catalysts outperformed those modified with commercial Pt/C catalysts under practically meaningful high current conditions (Fig. 16g) due to the efficient removal of hydrogen bubbles (Fig.…”

Designing free-standing 3D lamellar/pillared RGO/CNTs aerogels with ultra-high conductivity and compressive strength for elastic energy devices

“…, hydrogels and aerogels) represent a type of promising materials for energy relative fields. 5–7 In this regard, three-dimensional (3D) porous reduced graphene oxide (RGO) aerogels were considered as promising compressible materials due to their building blocks of RGO with ultra-light density, high compressibility, and excellent physical and chemical properties. 8–10 To date, RGO aerogels have been widely investigated in the fields of energy conversion and storage, 11,12 wave absorption, 13 separation, 14 sensors, 15,16 and so on.…”