2021年4月15日 · Herein, a facile electrochemical-pyrolysis strategy is applied to synthesize NiS/C 3 N 4 composite with N-Ni-S coordination sites by in-situ crystallization on copper foam (CF). A detailed characterization, especially synchrotron-based X-ray absorption fine structure (XAFS) clearly unravels the N-Ni-S coordination mode is successfully formed.

2020年8月17日 · Using in situ X-ray absorption spectroscopy (XAS), we show that the dominant active site for HER is the Ni single atom in its intrinsic environment in an acidic electrolyte, while, in alkaline...

2022年5月25日 · Here, we perform anodic electrochemical oxidation of Ni-metalloids (NiP x, NiS x, and NiSe x) to in-situ construct different oxyanion-coordinated amorphous nickel oxyhydroxides (NiOOH-TO x),...

2020年5月8日 · EXAFS of leached samples (table S2) supports the hypothesis of internal NiS x reservoirs by showing a Ni-Ni contribution similar to that of bulk Ni sulfides. Having hypothesized that internal NiS x phases may be present after leaching, we are now in a position to estimate their proportion among the pool of Ni species (see Supplementary Methods ...

图2e中，在傅里叶变换(FT) Ni的K边扩展X射线吸收精细结构(EXAFS)光谱中观察到三个主要峰。1.5Å处的第一个峰归属于Ni-O配位，1.9Å处的第二个峰归属于Ni-S配位，第三个主峰位于2.5Å，对应于Ni-M配位。

2019年10月15日 · Owing to the weakly lattice distortion, electronic modulation and synergistic effect between NiS 2 and CoS 2 domains, that were characterized by HRTEM and EXAFS, the NiS 2 /CoS 2 catalyst exhibits efficiently bifunctional (OER and ORR) properties that are much superior to the corresponding individuals.

2011年7月1日 · The EXAFS signal generated within the first six coordination shells (up to ~ 6.5 Å) was successfully interpreted using classical molecular dynamics and ab initio multiple-scattering EXAFS theory. We found that simple rigid-ion force-field model is able to describe the structure relaxation and dynamics in both bulk and nano-NiO.

1992年5月15日 · Extended x-ray-absorption fine-structure (EXAFS) spectra of α-MnS, CoS, α-NiS, β-NiS, Ni 3 S 2, wurtzite ZnS, and GaS have been recorded at the S K edge. These temperature-dependent data together with Ni K-edge EXAFS from β-NiS are analyzed to investigate a breakdown of transferability in S-Ni EXAFS scattering phase shifts. A comparison of ...

2019年7月16日 · 中国科学技术大学吴宇恩教授、李震宇教授 (共同通讯作者) 等人利用新型的自上而下策略将负载的镍金属纳米颗粒转变成热稳定的镍单原子，其大多数位于载体的表面上，并在 Angew. Chem. Int. Ed. 上发表了题为“ In Situ Thermal Atomization to Convert Supported Nickel Nanoparticles into Surface-Bound Nickel Single-Atom Catalysts ”的研究论文。 在具有丰富缺陷的氮掺杂碳的辅助下，上述合成工艺不仅可将纳米颗粒转化为单原子，而且还产生许多孔隙以促 …

EXAFS results demonstrate that the nickel sulfide particles in 60℃ dried sample are present in a tetrahetral structure with an average Ni -- S coordination distance of 0. 221nm and a Ni - S...