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...

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 We demonstrate the ability of tetraalkylammonium borohydrides to capture large amounts CO 2 , even at low concentrations, and reduce it formate under ambient conditions. These materials show absorption capacities up 30 mmol g −1 room temperature 1 bar . Every BH 4 − anion can react with three molecules form triformatoborohydride ([HB(OCHO) 3 ] ). The thermodynamics kinetics reaction were monitored by a magnetic suspension balance (MSB). Direct reduction from air was achieved...

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....

Abstract Boron doped graphene oxide (B‐GO) is a highly effective adsorbent for ammonia due to the high density of strong Lewis acid sites arising from boron. GO was by various amounts boron described as x B‐GO ( x= 1.0, 3.0, and 5.0). successfully synthesized doping confirmed X‐ray diffraction, Fourier transform infrared spectroscopy, photoelectron spectroscopy. The adsorption characteristics were investigated isotherm thermal desorption shows an increase with increasing concentration such...

The catalyst-free CO 2 reduction with ammonia borane in the solid state is reported. Close to 40 mmol of per gram can be reduced at 0.5 MPa and 60 °C formamide high yield, achieving a highly atom-economical process.

Supported aluminum-based complex hydrides (alanates) were investigated in view of their interaction at the interface. Nickel-containing porous carbon sheets (Ni-PCSs) combined with various alanates, resulting a decrease decomposition temperature and reduced volume expansion upon decomposition. The alanates Ni-PCS was observed via situ X-ray diffraction (XRD) found out that alanate expanded during thermolysis prevented layer changes by creating path for hydrogen to escape from liquid layer....

Electrochemical carbon dioxide reduction reaction (CO 2 RR) has the potential to adequately contribute addressing energy and environmental challenges faced by humanity today. The surplus of CO produced burning fossil fuels can be transformed into valuable products RR. An effective use this approach on a large scale requires active, selective, stable electrocatalysts. Additionally, insightful understanding interfacial behavior such as water wetting carbonate formation at electrode is required...

Climate change is an existential threat to humanity that calls for immediate reduction of CO 2 concentration in the atmosphere. While drastic green-house gas emissions needs remain primary objective, possible integration direct air capture (DAC) and electrocatalytic conversion represents a promising strategy aid averting climate catastrophe. In this presentation, we will summarize recent progress electrochemical value-added products at Los Alamos, which combine experimental modeling...

Electrochemical carbon dioxide reduction reaction (CO 2 RR) has the potential to play a key role in addressing major energy and environmental challenges via clean conversion of atmospheric CO from combusting fossil fuels into value-added products such as chemicals. The generated by RR vary depending on electrocatalyst used at electrolyzer cathode, 1 which calls for development more active, stable, selective electrocatalysts. Atomically dispersed Ni-N-C catalysts have attracted attention due...

수소가 청정 에너지 원으로서의 중요성이 증가하면서 수소의 생산원인 암모니아 기체가 큰 주목을 받고 있다. 그러나 암모니아가 금속을 잘 부식시키고 유독성을 가지고 있기 때문에 암모니아의 저장과 운반을 가능하게 하는 흡착제의 연구가 다각도로 진행되고 이 중 공유결합 유기구조 물질(covalent organic framework)의 하나인 COF-10은 붕소를 포함한 기공을 가진 물질이다. 흡착과정에서 COF-10의 구조 안에 있는 붕소는 루이스 산으로 작용하여 암모니아와 강한 결합을 한다. 본 논문에서는 이러한 COF-10을 합성하여 BET, XRD, FT-IR을 통해 구조를 확인한다. 또한 TPD와 등온 흡착 실험을 실제 흡착능력에 대한 분석을 진행하였다. COF-10는 9.79 mmol/g으로 우수한 능력을 보였으며 흡착제로서 활용 가능할 것으로 사료된다. Ammonia gas as a hydrogen source has received great attention since...

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...

Abstract We demonstrate the ability of tetraalkylammonium borohydrides to capture large amounts CO 2 , even at low concentrations, and reduce it formate under ambient conditions. These materials show absorption capacities up 30 mmol g −1 room temperature 1 bar . Every BH 4 − anion can react with three molecules form triformatoborohydride ([HB(OCHO) 3 ] ). The thermodynamics kinetics reaction were monitored by a magnetic suspension balance (MSB). Direct reduction from air was achieved...

In this study, SiO2@TiO2 core–shell nanoparticles were prepared under different pH's such as 5.0, 7.0, and 9.0. Under acidic neutral conditions, silica are more agglomerated, while less agglomeration occurs alkaline conditions. The latter case is attributed to repulsive forces between negatively charged because of the lack protons It was also observed that individual particle size hollow-structured TiO2 (HTiO2) significantly affected by pH. Below a pH larger than at 9.0 hydrolysis...