Abstract The activity and selectivity of the electrochemical CO 2 reduction reaction (CO RR) are often hindered by limited access to catalyst surface overtaken competing hydrogen evolution reaction. Herein, it is revealed that polymers used as binders can effectively modulate accessibility relative H O at vicinity thus performance RR. Three with different hydrophilicities (i.e., polyacrylic acid (PAA), Nafion, fluorinated ethylene propylene (FEP)) selected for Cu catalysts. At a thickness...

Metal complexes have shown impressive selectivity and activity as catalysts for electrochemical CO2 reduction (CO2RR), yet the nature of their active sites under operating conditions remains elusive. Herein, by using in situ Raman, X-ray photoelectron spectroscopy, advanced electron microscopy combination with density functional theory calculations, we reveal that copper phthalocyanine (CuPc) reconstructs during CO2RR, which proceeds through demetalation CuPc to Cu atoms followed...

Among the perovskites used to catalyze oxygen evolution reaction (OER), Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) exhibits excellent activity which is thought be related dynamic reconstruction at flexible perovskite surface due accommodation of large amount vacancies. By studying local structure and chemistry BSCF surfaces, in detail, via a range transmission electron microscopy (TEM) methods, we show that surfaces as-synthesized particles are Co/Fe rich, remarkably, adopt spinel-like with reduced...

CO-selective metals (e.g., Ag) on Cu catalysts improve the selectivity of multi-carbon (C2+) products in electrochemical CO2 reduction. However, origin improvement remains unclear due to convolution tandem and interface effects. Here, Ag@C@Cu core-shell were synthesized, which thin carbon interlayer inhibited direct interaction between Ag while still allowing reduction Ag, thus isolating effect from other This catalyst produced higher ratios ethanol ethylene relative monometallic catalyst,...

Cu-based bimetallic catalysts have attracted great attention for the reverse water gas shift (RWGS) reaction due to their high activity and selectivity. This work reports application of Cu–In RWGS demonstrates that promotion effect In on Cu is support sensitive. The Cu–In/ZrO2 catalyst exhibited significantly higher CO2 conversion than Cu/ZrO2 catalyst, whereas over Cu–In/CeO2 was much lower Cu/CeO2. reasons support-dependent revealed by systematic characterizations. On ZrO2 support, formed...

Abstract Direct borohydride fuel cells (DBFCs) operate with liquid H 2 O and a high‐energy‐density NaBH 4 solution. A facile, direct synthesis method using non‐noble nickel catalyst for the DBFC anode is shown. The complex reaction an anion‐exchange ionomer (AEI) cation‐exchange (CEI) evaluated in half‐cell single‐cell configurations. type produces high or low local pH at active site of configuration, generating different catalytic reactions. performance compared to that palladium catalyst....

Ni- and Co-based catalysts with added Fe demonstrate promising activity in the oxygen evolution reaction (OER) during alkaline water electrolysis, presence of a certain quantity being crucial for their enhanced performance. The mode incorporation, local placement, structure ions host catalyst, as well direct/indirect contribution to enhancing OER activity, remain under active investigation. Herein, mechanism incorporation into was investigated using an situ synthesized Co–Fe catalyst...

Platinum group metal-free catalysts (e.g., Fe–N–C and Co–N–C) are used as hydrogen peroxide reduction reaction (PRR) in direct borohydride fuel cells (DBFCs). is more active the PRR demonstrates high performance at beginning of DBFC test, whereas Co–N–C exhibits stability long-term operation. In DBFC-accelerated durability displays an activity decline 18.6%, a stable performance, with decrease only 6.7%. addition, site degrades rapidly than that terms demetalation central atom, revealed by...

A high content of acidic surface OFGs on a carbon support enables the fine dispersion Co-based nanocatalysts, enhancing its OER mass activity, while also inducing additional COOH groups that act as O 2 spillover sites.

Catalytic reduction of CO2 to valuable products is an attractive route for recycling. CeO2-supported Cu catalysts have shown high activity and selectivity the hydrogenation CO. To uncover origin their performance, we prepared a practical well-defined model Cu/CeO2–x with nanoparticles dispersed on CeO2–x support. We studied structure catalytic catalyst evolution active phase surface intermediates using near-ambient-pressure X-ray photoelectron spectroscopy (NAP-XPS) over under conditions....

Herein, a fluoropolymer bifunctional solid membrane interface (SMI) for an aqueous Al-air battery is proposed, which inhibits anodic self-corrosion, while concurrently reducing the accumulation of undesirable by-products. A using SMI exhibits remarkable anticorrosion efficiency 81.31% and achieves astonishing lifetime improvement rate 184.37% under condition 5 min intermittent discharge.

Cobalt phthalocyanine supported on carbon nanotubes (CoPcCNT) usually catalyzes the electroreduction of CO2 (CO2RR) to CO, although several reports have also indicated methanol formation. Herein, by analyzing effects of...

The atomically dispersed transition metal with nitrogen-doped carbon (M-N-C) has been studied as a possible replacement for platinum group (PGM) catalysts in fuel cell electrodes. In this work, the Fe-N-C and Co-N-C are used hydrogen peroxide reduction reaction (PRR) direct borohydride cells (DBFCs). Using half-cell membrane electrode assembly (MEA) configurations, PRR activity durability of M-N-C assessed. higher on than Co-N-C. is more stable under DBFC cathode, where sulfuric acid...

Methanation of CO 2 is an important reaction for reducing emissions in a power-to-gas system. Compared to cobalt supported on gamma-Al O 3 , graphene nanoplatelets (GNPs) showed significantly better performance methanation. Cobalt GNPs was capable 15% conversion CH 4 at temperatures below 250°C, compared 5% Al . In situ thermogravimetric analysis (TGA) demonstrated that the Co/GNP catalyst stable 400°C. The maximum mass-specific yield obtained Co loading 5 wt % GNPs; however, high...

Polymer Binders In article number 2103663, Wen Luo and co-workers develop powder catalysts coated with a polymer binder for enhanced electrochemical CO2 reduction to multi-carbon products, inspired by water-repulsive surfaces in nature. The use of hydrophobic binders increases the local concentration gas reactants reaction intermediates, enhancing reaction.

Borohyride Fuel Cells In article number 2103539, Andreas Züttel and co-workers develop a facile synthesis method for nickel catalyst ionomer composite replacing palladium catalysts in direct borohydride fuel cells (DBFCs). The DBFC operates with liquid (anode: sodium solution, cathode: hydrogen peroxide solution) to generate electricity.