Parameters Affecting the Fuel Cell Reactions on Platinum Bimetallic Nanostructures

In Situ Generation of Pt2Co3 Nano‐Alloys in Porous N‐Doped Carbon for Highly Efficient Electrocatalytic Hydrogen Evolution

“…Compared to the CO stripping peak of Pt/C (0.79 V vs RHE) (Figure S9d), the CO stripping peaks of Pt 2 Co 3 /NC‐950 also shifted negatively. The dramatic shift of the peak at 0.55 V may be due to the formation of adsorbed OH on oxophilic Co of Pt 2 Co 3 alloy that promotes CO oxidation in alkaline media [23] . Additionally, the electrochemical surface areas (ECSAs) of Pt 2 Co 3 /NC‐950 are estimated to be 54.6 m 2 mg −1 Pt in 0.5 M H 2 SO 4 and 39.7 m 2 mg −1 Pt in 1 M KOH while the ECSAs of Pt/C are 31.9 m 2 mg −1 Pt in 0.5 M H 2 SO 4 and 30.8 m 2 mg −1 Pt in 1 M KOH.…”

“…The dramatic shift of the peak at 0.55 V may be due to the formation of adsorbed OH on oxophilic Co of Pt 2 Co 3 alloy that promotes CO oxidation in alkaline media. [23] Additionally, the electrochemical surface areas (ECSAs) of Pt 2 Co 3 /NC-950 are estimated to be 54.6 m 2 mg À 1 Pt in 0.5 M H 2 SO 4 and 39.7 m 2 mg À 1 Pt in 1 M KOH while the ECSAs of Pt/C are 31.9 m 2 mg À 1 Pt in 0.5 M H 2 SO 4 and 30.8 m 2 mg À 1 Pt in 1 M KOH. These results demonstrate that Pt 2 Co 3 /NC-950 possesses more active sites.…”

“…is one of the most efficient ways to increase the number of active sites and enhance the catalytic activity of the active sites via tuning the electronic structure of Pt and inducing lattice strain of Pt surface, [21] resulting in the overall enhancement of the catalytic activity of the Pt catalysts towards HER and HOR. [22,23] Moreover, the introduced transition metal sites are potential active sites to catalyse different elemental steps of multistep reactions and adsorb the multiple intermediates generated during the reactions. [24] However, metal NPs have high surface energy and agglomerate during long-term catalysis, resulting in hindrance of the catalytically active sites.…”

Hybrid Ascharite/Reduced Graphene Oxide with Polysulfide Adsorption Host for Advanced Lithium–Sulfur Batteries

“…Triggered by ever-increasing demands in the application market for new energy storage devices such as vehicles, portable electronic products, and aerospace power supplies, lithium–sulfur batteries (LSBs) are considered promising next-generation battery systems because of their high specific capacity, energy density, natural abundance, nontoxicity, and low cost. − However, the breakthroughs in LSBs are still impeded by the notorious “shuttling effect” caused by intermediate lithium polysulfides (LPSs, Li 2 S n , 4 ≤ n ≤ 8) and the insulating nature of sulfur species, thereby leading to the low Coulombic efficiency (CE), sluggish redox kinetics, inadequate sulfur utilization, and poor cycle performance. − To design and prepare high-performance LSBs, dispersing sulfur nanoparticles into nanostructured porous carbon-based materials has attracted particular interest, , which can stabilize various S species and accelerate electron transfer in the charge storage process. Nevertheless, the nonpolar carbon materials have limited adsorption or anchoring sites to strongly immobilize polar intermediate LPSs …”

Non-precious metal high-entropy alloys with d–d electron interactions for efficient and robust hydrogen oxidation reactions in alkaline media

“…However, the efficiency of PEMFCs is contingent upon the extensive utilization of platinum group metal (PGM) catalysts, crucial for catalyzing the sluggish cathodic oxygen reduction reaction (ORR). 1,2 Presently, the advent of anion exchange membrane fuel cells (AEMFCs) is proposed as a prospective alternative to PEMFCs owing to advancements in the development of abundant PGMfree catalysts exhibiting Pt-like activity and higher stability in alkaline media. 3,4 Simultaneously, the utilization of economical air loops, membranes, and bipolar plates in AEMFCs is envisaged.…”