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A Stable Graphitic, Nanocarbon‐Encapsulated, Cobalt‐Rich Core–Shell Electrocatalyst as an Oxygen Electrode in a Water Electrolyzer
Advanced Energy Materials ( IF 27.8 ) Pub Date : 2018-01-11 , DOI: 10.1002/aenm.201702838
Arumugam Sivanantham 1 , Pandian Ganesan 1 , Luis Estevez 2 , B. Peter McGrail 2 , Radha Kishan Motkuri 2 , Sangaraju Shanmugam 1
Affiliation  

The oxygen electrode plays a vital role in the successful commercialization of renewable energy technologies, such as fuel cells and water electrolyzers. In this study, the Prussian blue analogue‐derived nitrogen‐doped nanocarbon (NC) layer‐trapped, cobalt‐rich, core–shell nanostructured electrocatalysts (core–shell Co@NC) are reported. The electrode exhibits an improved oxygen evolution activity and stability compared to that of the commercial noble electrodes. The core–shell Co@NC‐loaded nickel foam exhibits a lower overpotential of 330 mV than that of IrO2 on nickel foam at 10 mA cm−2 and has a durability of over 400 h. The commercial Pt/C cathode‐assisted, core–shell Co@NC–anode water electrolyzer delivers 10 mA cm−2 at a cell voltage of 1.59 V, which is 70 mV lower than that of the IrO2–anode water electrolyzer. Over the long‐term chronopotentiometry durability testing, the IrO2–anode water electrolyzer shows a cell voltage loss of 230 mV (14%) at 95 h, but the loss of the core–shell Co@NC–anode electrolyzer is only 60 mV (4%) even after 350 h cell‐operation. The findings indicate that the Prussian blue analogue is a class of inorganic nanoporous materials that can be used to derive metal‐rich, core–shell electrocatalysts with enriched active centers.

中文翻译:

稳定的石墨,纳米碳包裹,富钴核壳电催化剂作为水电解槽中的氧电极

氧电极在可再生能源技术(例如燃料电池和水电解器)的成功商业化中起着至关重要的作用。在这项研究中,报道了普鲁士蓝类似物衍生的氮掺杂纳米碳(NC)层捕获的富钴核壳纳米结构电催化剂(核壳Co @ NC)。与市售贵金属电极相比,该电极具有改进的氧释放活性和稳定性。核壳型Co @ NC负载镍泡沫在10 mA cm -2的镍泡沫上比IrO 2具有330 mV的低电势,并且具有超过400 h的耐久性。商用Pt / C阴极辅助,核壳型Co @ NC-阳极水电解槽可提供10 mA cm -2的电流电池电压为1.59 V,比IrO 2阳极水电解槽低70 mV 。在长期计时电位器耐久性测试中,IrO 2阳极水电解器在95 h时显示出230 mV的电池电压损失(14%),但核壳型Co @ NC阳极电解器的损失仅为60 mV (3%)即使在350小时的电池操作后也是如此。研究结果表明,普鲁士蓝类似物是一类无机纳米多孔材料,可用于衍生具有丰富活性中心的富金属,核壳型电催化剂。
更新日期:2018-01-11
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