Vanadium carbide nanodots anchored on N doped carbon nanosheets fabricated by spatially confined synthesis as a high-efficient electrocatalyst for hydrogen evolution reaction

Entwined Co(OH)2 In Situ Anchoring on 3D Nickel Foam with Phenomenal Bifunctional Activity in Overall Water Splitting

“…In alkaline condition, the overall water-splitting reaction rate depends upon H + /H 2 O adsorption (Volmer) and H 2 desorption (Heyrovsky/Tafel). The hydrogen-bonding energy (Δ G H* ) can be employed to determine hydrogen evolution reaction (HER) activity. − A large Δ G H* is advantageous and unfavorable for hydrogen adsorption and H 2 evaluation, respectively; however, reverse is true for catalysts with a small Δ G H* . Therefore, an electrocatalyst with a moderate hydrogen-bonding energy is required for H 2 production: volcano plot reveals that the most efficient Pt and Pd are situated at the top because Δ G H* = 0 .…”

Greenly Reduced CoFe‐PBA/Nickel Foam: A Robust Dual Electrocatalyst for Solar‐Driven Alkaline Water Electrolysis with a Low Cell Voltage

“…Therefore, the electrocatalyst with moderate hydrogen bonding energy is required for H 2 production: [10] Volcano plot reveal that the most efficient Pt and Pd situated at top because ΔG H* =0 [8] . Since high cost as well as scarcity of Pt and Pd hindered their applications, [11,12] scientists and academicians are forced to develop earth abundant catalysts with excellent HER activity [6,13] . In view of more earth abundant, Co‐based composites with properties very nearer to state‐of‐art catalysts are the potential materials to change Pt/Pd‐based catalysts [14,15] …”

“…[3,4] Water electrolysis consist of two half-reactions namely, HER (E = 0 V vs. RHE) and OER (E = 1.23 V vs. RHE) for H 2 (cathode) and O 2 generation (anode), respectively. [5] In alkaline condition, the activated H* bound with electrocatalyst surface by dissociation of H 2 O (Volmer step) [6] which (H*) reacts with H 2 O and e À to evolve H 2 (Heyrovsky step) and two active H* atoms combined to form H 2 (Tafel reaction). [7] Hence, overall water splitting reaction rate depends upon H + / H 2 O adsorption (Volmer step) and H 2 desorption (Heyrovsky step/Tafel step).…”

“…[8] Since high cost as well as scarcity of Pt and Pd hindered their applications, [11,12] scientists and academicians are forced to develop earth abundant catalysts with excellent HER activity. [6,13] In view of more earth abundant, Co-based composites with properties very nearer to state-of-art catalysts are the potential materials to change Pt/Pd-based catalysts. [14,15] The OER (1.23 V) presents a severe bottleneck compared to HER (0 V) owing to sluggish kinetics originating from the multistep electron transfer process: [16,17] OER involved OH À breakage, another OH À adsorption and OÀ O formation.…”

Single-Step and Room-Temperature Synthesis of Laser-Induced Pt/VC Nanocomposites as Effective Bifunctional Electrocatalysts for Hydrogen Evolution and Oxygen Evolution Reactions

“…As can be clearly seen in HRTEM, the well-defined NPs with clear boundaries are homogeneously encapsulated in graphitic carbon layers, which greatly promotes the electrical conductivity of electrocatalysts. 1 In addition, the lattice spacing (0.240, 0.226, and 0.340 nm) are clearly shown, which can be indexed to the (111) plane of the cubic VC phase, 14,32 the (111) plane of cubic Pt phase, 33 and the (002) plane of the graphene layer, 34 respectively. Energy-dispersive X-ray spectroscopy (EDS) mapping images (Figure 1J) indicate that C (red), O (orange), V (green), and Pt (purple) elements are uniformly distributed in Pt/VC-2.84.…”