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Heterointerface engineering of cobalt molybdenum suboxide for overall water splitting
Nanoscale ( IF 5.8 ) Pub Date : 2023-09-06 , DOI: 10.1039/d3nr02458j Renjith Nadarajan 1 , Anju V Gopinathan 1 , Naduvile Purayil Dileep 1 , Akshaya S Sidharthan 1 , Manikoth M Shaijumon 1
Nanoscale ( IF 5.8 ) Pub Date : 2023-09-06 , DOI: 10.1039/d3nr02458j Renjith Nadarajan 1 , Anju V Gopinathan 1 , Naduvile Purayil Dileep 1 , Akshaya S Sidharthan 1 , Manikoth M Shaijumon 1
Affiliation
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Highly active and earth-abundant electrocatalysts for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) are of great significance for sustainable hydrogen generation through alkaline water electrolysis. Here, with an aim to enhance the bifunctional electrocatalytic activity of cobalt molybdate towards overall water splitting, we demonstrate a simple method involving the modulation of the cobalt to molybdenum ratio and creation of phase-modulated heterointerfaces. Samples with varying Co/Mo molar ratios are obtained via a microwave-assisted synthesis method using appropriate starting precursors. The synthesis conditions are modified to create a heterointerface involving multiple phases of cobalt molybdenum suboxides (CoO/CoMoO3/Co2Mo3O8) supported on Ni foam (NF). Detailed electrochemical studies reveal that modulating the composition and hence the interface can tweak the bifunctional electrocatalytic activity of the material for HER and OER and thus improve the overall water splitting efficiency with very high durability over 500 h. To further evaluate the practical applicability of the studied catalyst in water splitting, an alkaline electrolyser is fabricated with the optimized cobalt molybdenum suboxide material (CMO-1.25) as a bifunctional electrocatalyst. A current density of 220 mA cm−2 @1.6 V and 670 mA cm−2 @1.8 V was obtained, and the device showed very good long-term durability.
中文翻译：
用于整体水分解的低氧化钴钼异质界面工程
用于析氢反应（HER）和析氧反应（OER）的高活性且地球丰富的电催化剂对于通过碱性水电解可持续制氢具有重要意义。在这里，为了增强钼酸钴对整体水分解的双功能电催化活性，我们展示了一种简单的方法，包括调节钴与钼的比例和创建相调制异质界面。使用适当的起始前体通过微波辅助合成方法获得具有不同 Co/Mo 摩尔比的样品。修改合成条件以创建涉及负载在泡沫镍（NF）上的钴钼低氧化物（CoO/CoMoO 3 /Co 2 Mo 3 O 8 ）多相的异质界面。详细的电化学研究表明，调节成分和界面可以调整材料对 HER 和 OER 的双功能电催化活性，从而提高整体水分解效率，并具有超过 500 小时的极高耐久性。为了进一步评估所研究的催化剂在水分解中的实际适用性，用优化的钴钼低氧化物材料（CMO-1.25）作为双功能电催化剂制造了碱性电解槽。获得了220mA cm -2 @1.6 V和670 mA cm -2 @1.8 V的电流密度，并且该器件表现出非常好的长期耐久性。
更新日期：2023-09-07
中文翻译：
用于整体水分解的低氧化钴钼异质界面工程
用于析氢反应（HER）和析氧反应（OER）的高活性且地球丰富的电催化剂对于通过碱性水电解可持续制氢具有重要意义。在这里，为了增强钼酸钴对整体水分解的双功能电催化活性，我们展示了一种简单的方法，包括调节钴与钼的比例和创建相调制异质界面。使用适当的起始前体通过微波辅助合成方法获得具有不同 Co/Mo 摩尔比的样品。修改合成条件以创建涉及负载在泡沫镍（NF）上的钴钼低氧化物（CoO/CoMoO 3 /Co 2 Mo 3 O 8 ）多相的异质界面。详细的电化学研究表明，调节成分和界面可以调整材料对 HER 和 OER 的双功能电催化活性，从而提高整体水分解效率，并具有超过 500 小时的极高耐久性。为了进一步评估所研究的催化剂在水分解中的实际适用性，用优化的钴钼低氧化物材料（CMO-1.25）作为双功能电催化剂制造了碱性电解槽。获得了220mA cm -2 @1.6 V和670 mA cm -2 @1.8 V的电流密度，并且该器件表现出非常好的长期耐久性。
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