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利用工艺简单,成本低廉的共沉淀法制得CoOOH,并用作非水性锂-氧气电池阴极催化剂。通过恒流充放电、线性伏安扫描(LSV)和电化学阻抗(EIS)测试研究了电极的电化学性能。结果表明:由于CoOOH能够明显提高氧气还原反应(ORR)的催化活性,与未使用CoOOH的电极相比较,使用CoOOH为催化剂的电极首次放电容量高达5 093 mAh·g-1,提高了1.7倍。电池的充电过电压降低了约460 mV,充电可逆性得到增强,充放电可逆性提高,使得循环性能得到显著改善。 相似文献
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Activating CoOOH Porous Nanosheet Arrays by Partial Iron Substitution for Efficient Oxygen Evolution Reaction
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Sheng‐Hua Ye Zi‐Xiao Shi Jin‐Xian Feng Prof. Ye‐Xiang Tong Prof. Gao‐Ren Li 《Angewandte Chemie (International ed. in English)》2018,57(10):2672-2676
Iron‐substituted CoOOH porous nanosheet arrays grown on carbon fiber cloth (denoted as FexCo1?xOOH PNSAs/CFC, 0≤x≤0.33) with 3D hierarchical structures are synthesized by in situ anodic oxidation of α‐Co(OH)2 NSAs/CFC in solution of 0.01 m (NH4)2Fe(SO4)2. X‐ray absorption fine spectra (XAFS) demonstrate that CoO6 octahedral structure in CoOOH can be partially substituted by FeO6 octahedrons during the transformation from α‐Co(OH)2 to FexCo1?xOOH, and this is confirmed for the first time in this study. The content of Fe in FexCo1?xOOH, no more than 1/3 of Co, can be controlled by adjusting the in situ anodic oxidation time. Fe0.33Co0.67OOH PNSAs/CFC shows superior OER electrocatalytic performance, with a low overpotential of 266 mV at 10 mA cm?2, small Tafel slope of 30 mV dec?1, and high durability. 相似文献
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本文合成并分析了导电剂CoOOH的结构性质、形貌和电性能,着重研究了CoOOH的含量对K2FeO4电极放电性能的影响.研究结果表明,K2FeO4电极的放电性能随着CoOOH含量的增大而逐渐增强. 相似文献
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通过水热处理Co(NO3)2与(NH4)2S2O8合成了CoOOH多面体, 再经高温煅烧得到具有介孔结构的Co3O4多面体; 利用扫描电子显微镜(SEM)、 透射电子显微镜(TEM)、 X射线衍射(XRD)和N2吸附\|脱附实验等手段对其结构和组成进行了表征; 研究了反应时间、 反应温度及(NH4)2S2O8浓度等因素对CoOOH多面体形貌的影响, 分析了CoOOH多面体的形成机理. 性能测试结果表明, 该介孔Co3O4多面体具有良好的葡萄糖电化学检测活性, 检测线性范围为0.05~1.8 mmol/L, 响应灵敏度为148 μA·cm-2·mmol·L-1, 检出限为1 μmol/L. 相似文献
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Junheng Huang Junting Chen Dr. Tao Yao Dr. Jingfu He Shan Jiang Dr. Zhihu Sun Dr. Qinghua Liu Weiren Cheng Fengchun Hu Dr. Yong Jiang Dr. Zhiyun Pan Prof. Shiqiang Wei 《Angewandte Chemie (International ed. in English)》2015,54(30):8722-8727
Endowing transition‐metal oxide electrocatalysts with high water oxidation activity is greatly desired for production of clean and sustainable chemical fuels. Here, we present an atomically thin cobalt oxyhydroxide (γ‐CoOOH) nanosheet as an efficient electrocatalyst for water oxidation. The 1.4 nm thick γ‐CoOOH nanosheet electrocatalyst can effectively oxidize water with extraordinarily large mass activities of 66.6 A g?1, 20 times higher than that of γ‐CoOOH bulk and 2.4 times higher than that of the benchmarking IrO2 electrocatalyst. Experimental characterizations and first‐principles calculations provide solid evidence to the half‐metallic nature of the as‐prepared nanosheets with local structure distortion of the surface CoO6?x octahedron. This greatly enhances the electrophilicity of H2O and facilitates the interfacial electron transfer between Co ions and adsorbed ‐OOH species to form O2, resulting in the high electrocatalytic activity of layered CoOOH for water oxidation. 相似文献
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利用工艺简单,成本低廉的共沉淀法制得CoOOH,并用作非水性锂-氧气电池阴极催化剂。通过恒流充放电、线性伏安扫描(LSV)和电化学阻抗(EIS)测试研究了电极的电化学性能。结果表明:由于CoOOH能够明显提高氧气还原反应(ORR)的催化活性,与未使用CoOOH的电极相比较,使用CoOOH为催化剂的电极首次放电容量高达5 093 mAh·g-1,提高了1.7倍。电池的充电过电压降低了约460 mV,充电可逆性得到增强,充放电可逆性提高,使得循环性能得到显著改善。 相似文献
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Hongnan Jia Na Yao Can Yu Hengjiang Cong Prof. Dr. Wei Luo 《Angewandte Chemie (International ed. in English)》2023,62(49):e202313886
The electrolyte cations-dependent kinetics have been widely observed in many fields of electrocatalysis, however, the exact mechanism of the influence on catalytic performance is still a controversial topic of considerable discussion. Herein, combined with operando X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM), we verify that the electrolyte cations could intercalate into the layer of pristine CoOOH catalyst during the oxygen evolution reaction (OER) process, while the bigger cations lead to enlarged interlayer spacing and increased OER activity, following the order Cs+>K+>Na+>Li+. X-ray absorption spectroscopy (XAS), in situ Raman, in situ Ultraviolet-visible (UV/Vis) spectroscopy, in situ XAS spectroscopy, cyclic voltammetry (CV), and theoretical calculations reveal that the intercalation of electrolyte cations efficiently modify the oxidation states of Co by enlarging the Co−O bonds, which in turn enhance the d-band center of Co, optimize the adsorption strength of oxygen intermediates, facilitate the formation of OER active Co(IV) species, and reduce the energy barrier of the rate-determing step (RDS), thereby enhancing the OER activity. This work not only provides an informative picture to understand the complicated dependence of OER kinetics on electrolyte cations, but also sheds light on understanding the mechanism of other electrolyte cation-targeted electrocatalysis. 相似文献
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