Interfacial electric field regulates surface water environment in RuO2 coated Co3O4 for proton exchange membrane water electrolysis
Interfacial electric field regulates surface water environment in RuO2 coated Co3O4 for proton exchange membrane water electrolysis
研究概述
在Co3O4表面共形包覆RuO2，通过Ru—O—Co耦合调节Ru电子结构，抑制晶格氧参与，并利用界面电场改善表面水环境和*OH覆盖。催化剂酸性析氧质量活性376.6 A/g，为商用RuO2的27倍；PEM电解槽在0.15 mgRu/cm²负载下，以1.75 V达到500 mA/cm²。
谱图与表征信息
Figure 5 Interfacial electric field mediated EDL optimization. (a,b) Potential-dependent absorption strength of interfacial water through in situ ATR-SEIRAS in 0.5 M H2SO4 electrolyte for Com-RuO2 (a) and RuO2-Co3O4 (b) catalysts on the Au electrode. 4-HB-H2O, 2-HB-H2O, and free-H2O are shown in red, blue and green, respectively. (c) The proportions of different types of water for RuO2-Co3O4 catalysts, derived from (b). (d) The proportions of free-H2O at varied potentials of Com-RuO2, Co3O4 and RuO2-Co3O4 respectively. (e) Potential ratio (VOER/VMOR) for Com-RuO2 and RuO2-Co3O4 at different current densities. (f,g) In situ Co K-edge XANES (f) and corresponding EXAFS data (g) of RuO2-Co3O4, at OCV, 1.3 VRHE, 1.5 VRHE and Back to OCV, respectively.
Figure S3. Wavelet transform of Co K-edge EXAFS data for Co-foil (a), Co3O4 (b) and RuO2-Co3O4 (c).
Figure S4. EXAFS fitting results of Co-foil (a), Co3O4 (b) and RuO2-Co3O4 (c).
Figure S16. (a,b) In situ Co K-edge XANES (a) and corresponding EXAFS data (b) of Co3O4, at OCV, 1.3 VRHE, 1.5 VRHE and Back to