Laser synthesis of amorphous CoS_xnanospheres for efficient hydrogen evolution and nitrogen reduction reactions

Abstract

Transition metal sulfides (TMSs) have been demonstrated excellent electrode materials for various applications of electrochemical energy conversion and storage due to their tunable composition and multifunctionality. However, the synthesis of...

Sulfur Vacancy-Rich CuS for Improved Surface-Enhanced Raman Spectroscopy and Full-Spectrum Photocatalysis

“…Moreover, the shoulder at 934.9 eV is presumably originated from slight oxidation of CuS, which is ascribed to CuSO 4 [ 44 ]. The S 2p XPS spectra can be deconvoluted into peaks located at 162.1 and 163.2, corresponding to S 2p 3/2 and S 2p 1/2 of CuS, and peaks at 164.0 and 164.9 eV, originating from S-S 2p 3/2 and S-S 2p 1/2 of CuS, respectively [ 44 , 45 , 46 ]. In addition, broad BE bands at around 169.0 and 170.2 eV indicate the presence of sulfate species (e.g., SO 4 2− ), resulted from the partly oxidization of S 2− during hydrothermal synthesis [ 44 , 47 ].…”

Strategies to achieve effective nitrogen activation

“…Meanwhile, introducing nitrides obscures the nitrogen traceability of NH 3 synthesis, and the corresponding NRR mechanisms are too complex to achieve clear investigation. 113,114 Herein, Zhao et al 106,107 used highenergy physics methods such as magnetron sputtering and laser to accurately control the surface vacancy of TMOs and sulfides, thus improving the NRR activity. The introduction of magnetron sputtering synchronously realizes the regulation of the metal valence state and oxygen vacancy (Figure 6B).…”

“…Defect and interface engineering are efficient strategies for promoting the intrinsic and extrinsic catalytic activity of metal sulfides. Zhao et al 107 achieved promoted NRR activity on CoS x with a yield of 12.2 μg h −1 cm −2 by via laser to tune the sulfur vacancies on the material surface Reproduced with permission: Copyright 2022, Elsevier. 108 (Figure 6C).…”

Green and large‐scale production of ammonia: Laser‐driven pyrolysis of nitrogen‐enriched biomass

“…Especially, NH 3 is an energy storage intermediate and a carbon‐free energy carrier, with high energy density and no CO 2 emissions from combustion, popping up as a candidate green energy vector 2 . In view of this, to achieve highly efficient ammonia synthesis, researchers have invested a lot of attempts on technical routes such as thermocatalysis, photocatalysis, and electrocatalysis 3–6 . The industrial Haber‐Bosch process, converting the reaction mixture into ammonia, is considered the greatest chemical invention of the 20th century and is the main way to artificially fix nitrogen.…”

“…2 In view of this, to achieve highly efficient ammonia synthesis, researchers have invested a lot of attempts on technical routes such as thermocatalysis, photocatalysis, and electrocatalysis. [3][4][5][6] The industrial Haber-Bosch process, converting the reaction mixture into ammonia, is considered the greatest chemical invention of the 20th century and is the main way to artificially fix nitrogen. However, Haber-Bosch process takes place under austere conditions (high temperatures over 400 • C and high pressures of 200-300 bar), consuming large amounts of energy and produces large CO 2 emissions (1.6% of the global total) 7 .…”