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Crystalline Cobalt Oxide Films for Sustained Electrocatalytic Oxygen Evolution under Strongly Acidic Conditions
Chemistry of Materials ( IF 7.2 ) Pub Date : 2017-01-18 00:00:00 , DOI: 10.1021/acs.chemmater.6b02879 Jared S. Mondschein 1 , Juan F. Callejas 1 , Carlos G. Read 1 , Jamie Y. C. Chen 1 , Cameron F. Holder 1 , Catherine K. Badding 1 , Raymond E. Schaak 1
Chemistry of Materials ( IF 7.2 ) Pub Date : 2017-01-18 00:00:00 , DOI: 10.1021/acs.chemmater.6b02879 Jared S. Mondschein 1 , Juan F. Callejas 1 , Carlos G. Read 1 , Jamie Y. C. Chen 1 , Cameron F. Holder 1 , Catherine K. Badding 1 , Raymond E. Schaak 1
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Earth-abundant materials capable of catalyzing the electrochemical decomposition of water into molecular hydrogen and oxygen are necessary components of many affordable water-splitting technologies. However, water oxidation catalysts that facilitate sustained oxygen evolution at device-relevant current densities in strongly acidic electrolytes have been limited almost exclusively to precious metal oxides. Here, we show that nanostructured films of cobalt oxide (Co3O4) on fluorine-doped tin oxide (FTO) substrates, made by first depositing Co onto FTO and heating in air at 400 °C to produce films having a robust electrical and mechanical Co3O4/FTO interface, function as active electrocatalysts for the oxygen evolution reaction (OER) in 0.5 M H2SO4. The Co3O4/FTO electrodes evolve oxygen with near-quantitative Faradaic yields and maintain a current density of 10 mA/cm2 for over 12 h at a moderate overpotential of 570 mV. At lower current densities that require lower overpotentials, sustained oxygen production for several days and weeks can be achieved.
中文翻译：
结晶氧化钴膜在强酸性条件下持续电催化氧释放
能够催化水电化学分解成氢和氧的富地球物质是许多可负担的水分解技术的必要组成部分。然而，在强酸性电解质中促进与装置相关的电流密度下持续的氧气释放的水氧化催化剂几乎仅限于贵金属氧化物。在这里，我们显示了在掺杂氟的氧化锡（FTO）衬底上形成氧化钴（Co 3 O 4）的纳米结构膜，该方法是先将Co沉积到FTO上，然后在400°C的空气中加热，以生产出具有牢固的电学性能的薄膜。机械Co 3 O 4/ FTO界面在0.5 MH 2 SO 4中用作氧气析出反应（OER）的活性电催化剂。Co 3 O 4 / FTO电极以接近定量的法拉第产率释放氧气，并在570 mV的中等过电势下，在12 h内保持10 mA / cm 2的电流密度。在需要较低过电位的较低电流密度下，可以实现持续数天和数周的持续氧气生产。
更新日期：2017-01-18
中文翻译：
结晶氧化钴膜在强酸性条件下持续电催化氧释放
能够催化水电化学分解成氢和氧的富地球物质是许多可负担的水分解技术的必要组成部分。然而，在强酸性电解质中促进与装置相关的电流密度下持续的氧气释放的水氧化催化剂几乎仅限于贵金属氧化物。在这里，我们显示了在掺杂氟的氧化锡（FTO）衬底上形成氧化钴（Co 3 O 4）的纳米结构膜，该方法是先将Co沉积到FTO上，然后在400°C的空气中加热，以生产出具有牢固的电学性能的薄膜。机械Co 3 O 4/ FTO界面在0.5 MH 2 SO 4中用作氧气析出反应（OER）的活性电催化剂。Co 3 O 4 / FTO电极以接近定量的法拉第产率释放氧气，并在570 mV的中等过电势下，在12 h内保持10 mA / cm 2的电流密度。在需要较低过电位的较低电流密度下，可以实现持续数天和数周的持续氧气生产。
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