理解催化剂-电解液界面水分子在酸性OER过程中的结构和动态变化对于发展质子交换膜电解水器件非常重要。 有鉴于此,武汉大学罗威教授等报道发展了一系列p区金属(Ga, In, Sn)掺杂RuO2催化剂,因此能够调控电子结构和Ru-O的共价化学键,研究了电化学界...
通过Co单原子调整Ru原子周围的电子结构,Co-SAC/RuO2中Co与Ru之间的相互作用能够有效降低HER和OER的活性势垒,不仅可以提升RuO2在碱性条件下催化OER的稳定性问题,而且能够显著增强Ru基电催化剂在酸性条件下的HER活性。 参考文献: Khadim Sha...
本研究制备了一种缺陷丰富的掺硒RuO2气凝胶(Se-RuO2气凝胶),作为酸性介质中优异的析氧反应(OER)电催化剂。在电流密度为10 mA cm-2时,Se-RuO2气凝胶的过电位为166 mV,长期稳定性长达48 h。同时,详细的原位实验表明,Se-RuO2气凝胶在OER过程中保持了良好的稳定性,其反应路径遵循更稳定的吸附演化机制。因此,...
d The active sites (yellow highlights) on RuO2-T-VRu, O for catalyzing OER. e, f Raman spectra for MD-RuO2-BN and C-RuO2 in ordinary 0.5 M H2SO4. g Normalized intensity of Raman band at 588 cm−1 to that at 430 cm−1 on the catalysts as a function of applied ...
其中,缓慢的氧还原/氧演化反应(ORR/OER)动力学和绝缘且不溶性的放电产物(Li2O2)是最棘手和紧迫的挑战。所以具有超高催化活性和耐久性的催化剂往往能显著提高锂-氧气电池的电化学性能。此外,理想的锂-氧气电池正极材料还应具有较高的比表面积和合适的孔隙结构,从而为离子/气体的输运和放电产物的积累提供足够的...
RuO2/D-Co3O4/CC是一种很有前途的酸性OER电催化剂。 Figure 1.Schematic diagram of the synthesis process for RuO2/D-Co3O4/CC. Figure 2.(a) XRD and (b) Raman spectra of the as-prepared samples. SEM images at different magnifications ofRuO2/D-Co3O4/CCin (c) and (d). ...
At the current stage, the acidic OER catalysts in PEMWE rely highly on the use of iridium (Ir)-based catalysts on account of their good stability7,8,9. However, the low abundance and high cost of Ir metal limit the wide application of PEMWE. Ruthenium dioxide (RuO2), with relatively ...
The higher content of low-valent Ru species on the surface of py-RuO2:Zn catalyst remained under the OER conditions, as confirmed by the Raman measurements (Supplementary Fig. 13). Since the TEM data in Fig. 1i confirmed the presence of the rutile phase in py-RuO2:Zn, a higher Ru3+...
Fig. 4: OER mechanism of Pb-RuO2. aTheiR-corrected polarization curves of Pb-RuO2and RuO2in 0.5 M H2SO4solution with (dashed lines) and without (solid lines) 1 M methanol.bIn situ Raman spectra of Pb-RuO2and RuO2obtained under various applied potentials.cSchematic illustration of...
总之,该研究开发了一种高效且稳定的双功能催化剂Co-SAC/RuO2,能够同时用于提升电催化HER和OER性能。该催化剂将Co单原子掺入RuO2球中,其中RuO2球中的Co单原子通过XAS、AC-STEM和DFT表征得到了证实。通过Co单原子调整Ru原子周围的电子结构,Co-SAC/RuO2中Co与Ru之间的相互作用能够有效降低HER和OER的活性势垒,不仅...