Recent engineering advances in nanocatalysts for NH3-to-H2 conversion technologies

Tran, Duy Thanh; Nguyễn, Thanh Hải; Jeong, Hun; Tran, Phan Khanh Linh; Malhotra, Deepanshu; Jeong, Kwang Un; Kim, Nam Hoon; Lee, Joong Hee

doi:10.1016/j.nanoen.2022.106929

Cited by 24 publications

(11 citation statements)

References 206 publications

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“…This implied that adsorbed NH 3 species had been decomposed in the presence of Pt/Al 2 O 3 via eqn (13). 43 Accordingly, a peak at 450.2 °C could be observed in the N 2 production profile of the Pt/Al 2 O 3 catalyst. At this point, one could consider that, for the Pt/Al 2 O 3 catalyst, N 2 molecules formed at low temperature could mainly be ascribed to the NH 3 -SCO reaction (eqn (1)), while N 2 and H 2 formed at high temperature could be ascribed to the NH 3 decomposition reaction.…”

Section: Resultsmentioning

confidence: 89%

A mixed catalyst prepared by mechanically milling VW/TiO₂ and low content of Pt/Al₂O₃ for SCO of high-concentration NH₃

et al. 2022

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Section: Resultsmentioning

confidence: 89%

A mixed catalyst prepared by mechanically milling VW/TiO₂ and low content of Pt/Al₂O₃ for SCO of high-concentration NH₃

et al. 2022

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“…For PCET steps, the BDE of X−H (X=N or O) bonds are important. The gas‐phase BDEs of H 2 O molecules and NH 3 molecules are 111.0 and 99.5 kcal mol −1 , respectively [1a,10] . Taking solvent effects into consideration, the BDE X−H of H 2 O molecules and NH 3 molecules were still very high and calculated as 91.0 and 78.3 kcal mol −1 , causing the high energy barriers for the cleavage of X−H bonds.…”

Section: Resultsmentioning

confidence: 99%

Highly Selective Ammonia Oxidation on BiVO₄ Photoanodes Co‐catalyzed by Trace Amounts of Copper Ions

Wu,

Li,

Dang

et al. 2023

Angew Chem Int Ed

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High‐efficient photoelectrocatalytic direct ammonia oxidation reaction (AOR) conducted on semiconductor photoanodes remains a substantial challenge. Herein, we develop a strategy of simply introducing ppm levels of Cu ions (0.5–10 mg/L) into NH3 solutions to significantly improve the AOR photocurrent of bare BiVO4 photoanodes from 3.4 to 6.3 mA cm−2 at 1.23 VRHE, being close to the theoretical maximum photocurrent of BiVO4 (7.5 mA cm−2). The surface charge‐separation efficiency has reached 90 % under a low bias of 0.8 VRHE. This AOR exhibits a high Faradaic efficiency (FE) of 93.8 % with the water oxidation reaction (WOR) being greatly suppressed. N2 is the main AOR product with FEs of 71.1 % in aqueous solutions and FEs of 100 % in non‐aqueous solutions. Through mechanistic studies, we find that the formation of Cu−NH3 complexes possesses preferential adsorption on BiVO4 surfaces and efficiently competes with WOR. Meanwhile, the cooperation of BiVO4 surface effect and Cu‐induced coordination effect activates N−H bonds and accelerates the first rate‐limiting proton‐coupled electron transfer for AOR. This simple strategy is further extended to other photoanodes and electrocatalysts.

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“…(1) high energy density; (2) easy storage and transportation; (3) high safety; (4) mature large-scale production process [107]. It can also be directly used in fuel cells, especially solid oxide fuel cells (SOFCs).…”

Section: Exsolution For Power Generation From Ammonia (Nh 3 )mentioning

confidence: 99%

Roadmap on exsolution for energy applications

et al. 2023

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Over the last decade, exsolution has emerged as a powerful new method for decorating oxide supports with uniformly dispersed nanoparticles for energy and catalytic applications. Due to their exceptional anchorage, resilience to various degradation mechanisms, as well as numerous ways in which they can be produced, transformed and applied, exsolved nanoparticles have set new standards for nanoparticles in terms of activity, durability and functionality. In conjunction with multifunctional supports such as perovskite oxides, exsolution becomes a powerful platform for the design of advanced energy materials. In the following sections, we review the current status of the exsolution approach, seeking to facilitate transfer of ideas between different fields of application. We also explore future directions of research, particularly noting the multi-scale development required to take the concept forward, from fundamentals through operando studies to pilot scale demonstrations.

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Recent engineering advances in nanocatalysts for NH3-to-H2 conversion technologies

Cited by 24 publications

References 206 publications

A mixed catalyst prepared by mechanically milling VW/TiO₂ and low content of Pt/Al₂O₃ for SCO of high-concentration NH₃

A mixed catalyst prepared by mechanically milling VW/TiO₂ and low content of Pt/Al₂O₃ for SCO of high-concentration NH₃

Highly Selective Ammonia Oxidation on BiVO₄ Photoanodes Co‐catalyzed by Trace Amounts of Copper Ions

Roadmap on exsolution for energy applications

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Recent engineering advances in nanocatalysts for NH3-to-H2 conversion technologies

Cited by 24 publications

References 206 publications

A mixed catalyst prepared by mechanically milling VW/TiO2 and low content of Pt/Al2O3 for SCO of high-concentration NH3

A mixed catalyst prepared by mechanically milling VW/TiO2 and low content of Pt/Al2O3 for SCO of high-concentration NH3

Highly Selective Ammonia Oxidation on BiVO4 Photoanodes Co‐catalyzed by Trace Amounts of Copper Ions

Roadmap on exsolution for energy applications

Contact Info

Product

Resources

About

A mixed catalyst prepared by mechanically milling VW/TiO₂ and low content of Pt/Al₂O₃ for SCO of high-concentration NH₃

A mixed catalyst prepared by mechanically milling VW/TiO₂ and low content of Pt/Al₂O₃ for SCO of high-concentration NH₃

Highly Selective Ammonia Oxidation on BiVO₄ Photoanodes Co‐catalyzed by Trace Amounts of Copper Ions