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Bifunctional Electrocatalytic Behavior of Sodium Cobalt Phosphates in Alkaline Solution
ChemElectroChem ( IF 3.5 ) Pub Date : 2017-10-18 , DOI: 10.1002/celc.201700873 Ritambhara Gond 1 , Krishnakanth Sada 1 , Baskar Senthilkumar 1 , Prabeer Barpanda 1
ChemElectroChem ( IF 3.5 ) Pub Date : 2017-10-18 , DOI: 10.1002/celc.201700873 Ritambhara Gond 1 , Krishnakanth Sada 1 , Baskar Senthilkumar 1 , Prabeer Barpanda 1
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Noble‐metal‐free, bifunctional catalysts are essential to develop high‐performance, cost‐effective water‐splitting systems. The current work explores the bifunctional electrocatalytic behavior of two sodium cobalt phosphate systems, namely, NaCoPO4 and Na2CoP2O7, prepared by solution combustion synthesis (SCS) for the first time. Formation of phase‐pure orthorhombic maricite NaCoPO4 (space group: Pnma) and orthorhombic Na2CoP2O7 (space group: Pna21) was confirmed by Rietveld refinement. The electrocatalytic activity of maricite NaCoPO4 and Na2CoP2O7 was investigated by using linear sweep voltammetry with a rotating disk electrode (RDE). The oxygen reduction reaction (ORR) activities of these sodium cobalt phosphates are comparable to Vulcan carbon black and Pt/C. Oxygen evolution reaction (OER) activity of Na2CoP2O7 is dominant compared to NaCoPO4 and Pt/C. The Tafel slope, electron‐transfer number, and stability of the sodium‐metal phosphates were calculated in different concentrations of Na+‐containing aqueous electrolyte. The bifunctional activity and good stability of the sodium cobalt phosphates stem from cobalt ions and stabilization of the catalytic centers by the phosphate frameworks. The present work demonstrates sodium cobalt phosphates as alternate cost‐effective, novel electrocatalysts for efficient OER/ORR activity in alkaline solution.
中文翻译：
磷酸钴钴在碱性溶液中的双功能电催化行为
不含贵金属的双功能催化剂对于开发高性能，经济高效的水分解系统至关重要。当前的工作探讨了首次通过溶液燃烧合成（SCS）制备的两个磷酸钠钴钴系统NaCoPO 4和Na 2 CoP 2 O 7的双功能电催化行为。Rietveld精炼证实了纯相的斜方晶的马氏体NaCoPO 4（空间群：Pnma）和斜方晶的Na 2 CoP 2 O 7（空间群：Pna2 1）的形成。马来石NaCoPO 4和Na的电催化活性。通过使用带有旋转圆盘电极（RDE）的线性扫描伏安法研究2 CoP 2 O 7。这些磷酸钴钴钠的氧还原反应（ORR）活性与Vulcan炭黑和Pt / C相当。与NaCoPO 4和Pt / C相比，Na 2 CoP 2 O 7的氧释放反应（OER）活性占主导地位。在不同的Na +浓度下计算了Tafel斜率，电子转移数和钠金属磷酸盐的稳定性含电解质水溶液。磷酸钴钴的双功能活性和良好的稳定性源于钴离子和磷酸盐骨架对催化中心的稳定作用。本工作证明了磷酸钴钴是一种可替代的具有成本效益的新型电催化剂，可在碱性溶液中有效地进行OER / ORR活性。
更新日期：2017-10-18
中文翻译：
磷酸钴钴在碱性溶液中的双功能电催化行为
不含贵金属的双功能催化剂对于开发高性能，经济高效的水分解系统至关重要。当前的工作探讨了首次通过溶液燃烧合成（SCS）制备的两个磷酸钠钴钴系统NaCoPO 4和Na 2 CoP 2 O 7的双功能电催化行为。Rietveld精炼证实了纯相的斜方晶的马氏体NaCoPO 4（空间群：Pnma）和斜方晶的Na 2 CoP 2 O 7（空间群：Pna2 1）的形成。马来石NaCoPO 4和Na的电催化活性。通过使用带有旋转圆盘电极（RDE）的线性扫描伏安法研究2 CoP 2 O 7。这些磷酸钴钴钠的氧还原反应（ORR）活性与Vulcan炭黑和Pt / C相当。与NaCoPO 4和Pt / C相比，Na 2 CoP 2 O 7的氧释放反应（OER）活性占主导地位。在不同的Na +浓度下计算了Tafel斜率，电子转移数和钠金属磷酸盐的稳定性含电解质水溶液。磷酸钴钴的双功能活性和良好的稳定性源于钴离子和磷酸盐骨架对催化中心的稳定作用。本工作证明了磷酸钴钴是一种可替代的具有成本效益的新型电催化剂，可在碱性溶液中有效地进行OER / ORR活性。
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