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Composition‐Dependent Effect of the Calcination of Cobalt‐, Nickel‐, and Gallium‐Based Layered Double Hydroxides to Mixed Metal Oxides in the Oxygen Evolution Reaction
ChemElectroChem ( IF 3.5 ) Pub Date : 2017-11-07 , DOI: 10.1002/celc.201700936 Kalapu Chakrapani 1 , Fatih Özcan 1, 2 , Klaus Friedel Ortega 1 , Thomas Machowski 1 , Malte Behrens 1, 3
ChemElectroChem ( IF 3.5 ) Pub Date : 2017-11-07 , DOI: 10.1002/celc.201700936 Kalapu Chakrapani 1 , Fatih Özcan 1, 2 , Klaus Friedel Ortega 1 , Thomas Machowski 1 , Malte Behrens 1, 3
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Mixed cobalt and nickel based layered double hydroxides (LDHs) with Ga as the third cation and the mixed metal oxides (MMOs) resulting from their thermal decomposition were synthesized in various compositions through constant pH co‐precipitation and calcination. The structural and textural properties of the catalysts with variable Co/Ni ratios were assessed by N2 physisorption, powder X‐ray diffraction, and electron microscopy. The obtained materials exhibit electrocatalytic activity for the oxygen evolution reaction in alkaline solution. The highest activity was found for catalysts containing both transition‐metal cations, Co and Ni. However, comparison of the LDH precursors and the calcined MMOs revealed a composition‐dependent effect of calcination. Co‐rich LDH tends to lose activity when calcined, whereas Ni‐rich LDH gains activity. The optimal cation composition of the LDH was Co1.5Ni0.5Ga with an overpotential of 382 mV. The highest performance among the MMOs, on the other hand, has been encountered for the Co0.5Ni1.5Ga composition, reaching a similar overpotential.
中文翻译：
析氧反应中钴，镍和镓基层状双氢氧化物煅烧成混合金属氧化物的成分依赖性效应
通过恒定的pH共沉淀和煅烧，以各种成分合成了以Ga为第三阳离子的钴和镍基混合层状双氢氧化物（LDHs）和由其热分解产生的混合金属氧化物（MMOs）。用N 2评估具有可变Co / Ni比的催化剂的结构和织构性质物理吸附，粉末X射线衍射和电子显微镜。所获得的材料对碱性溶液中的氧释放反应具有电催化活性。对于同时含有过渡金属阳离子，Co和Ni的催化剂，发现其活性最高。然而，LDH前体和煅烧的MMO的比较显示了煅烧的成分依赖性效应。富含钴的LDH在煅烧时往往会失去活性，而富含镍的LDH则具有活性。LDH的最佳阳离子组成为Co 1.5 Ni 0.5 Ga，过电势为382 mV。另一方面，对于Co 0.5 Ni 1.5 Ga组合物，在MMO中表现出最高的性能，达到了类似的超电势。
更新日期：2017-11-07
中文翻译：
析氧反应中钴，镍和镓基层状双氢氧化物煅烧成混合金属氧化物的成分依赖性效应
通过恒定的pH共沉淀和煅烧，以各种成分合成了以Ga为第三阳离子的钴和镍基混合层状双氢氧化物（LDHs）和由其热分解产生的混合金属氧化物（MMOs）。用N 2评估具有可变Co / Ni比的催化剂的结构和织构性质物理吸附，粉末X射线衍射和电子显微镜。所获得的材料对碱性溶液中的氧释放反应具有电催化活性。对于同时含有过渡金属阳离子，Co和Ni的催化剂，发现其活性最高。然而，LDH前体和煅烧的MMO的比较显示了煅烧的成分依赖性效应。富含钴的LDH在煅烧时往往会失去活性，而富含镍的LDH则具有活性。LDH的最佳阳离子组成为Co 1.5 Ni 0.5 Ga，过电势为382 mV。另一方面，对于Co 0.5 Ni 1.5 Ga组合物，在MMO中表现出最高的性能，达到了类似的超电势。
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