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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Direct Observation of Active Nickel Oxide Cluster in Nickel Borate Electrocatalyst for Water Oxidation by In Situ O K-Edge X-ray Absorption Spectroscopy
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Direct Observation of Active Nickel Oxide Cluster in Nickel Borate Electrocatalyst for Water Oxidation by In Situ O K-Edge X-ray Absorption Spectroscopy

机译：原位O K边缘X射线吸收光谱法直接观察硼酸镍电催化剂中活性氧化镍簇对水的氧化作用

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摘要

In situ 0 K-edge X-ray absorption fine structure (XAFS) spectroscopy was applied to investigate the electronic and structural change in the nickel borate (Ni-B-i) electrocatalyst during the oxygen evolution reaction (OER). An absorption peak was observed around 528.7 eV at 1.0 V versus Ag/AgCl in a potassium borate aqueous solution, which relates with the formation of nanoscale order domains of edge-sharing NiO6 octahedra in the Ni-B-i electrocatalyst. XAFS spectra were measured with variation of the electrode potential from 0.3 up to 1.0 V. The measured absorption peaks suggest that the quantity of NiO6 octahedra increased in correlation with the OER current; however, when the potential was changed downward, the XAFS absorption peak assigned to NiO6 octahedra remained constant, even at the electrode potential for no OER current. This difference implies that the water oxidation catalysis proceeds at the domain edge of NiO6 octahedra. The XAFS technique provides the first successful direct probing of the active species in the Ni-B-i electrocatalyst during electrochemical reaction.
机译：采用原位0 K边缘X射线吸收精细结构（XAFS）光谱研究了在氧释放反应（OER）过程中硼酸镍（Ni-B-i）电催化剂的电子和结构变化。在硼酸钾水溶液中，相对于Ag / AgCl，在1.0 V下观察到528.7 eV的吸收峰，这与在Ni-B-i电催化剂中边缘共享NiO6八面体的纳米级有序域的形成有关。 XAFS光谱是在电极电势从0.3到1.0 V的变化范围内测量的。测量的吸收峰表明NiO6八面体的数量与OER电流相关;但是，当电势向下变化时，即使在没有OER电流的电极电势下，分配给NiO6八面体的XAFS吸收峰也保持恒定。这种差异表明水氧化催化作用是在NiO6八面体的畴边缘处进行的。 XAFS技术在电化学反应过程中首次成功地对Ni-B-i电催化剂中的活性物质进行了直接探测。

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