Yolk‐Shell Structured Zinc‐Cobalt‐Ruthenium Alloy Oxide Assembled with Ultra‐Small Nanoparticles: A Superior Cascade Catalyst toward Oxygen Evolution Reaction
Yolk‐Shell Structured Zinc‐Cobalt‐Ruthenium Alloy Oxide Assembled with Ultra‐Small Nanoparticles: A Superior Cascade Catalyst toward Oxygen Evolution Reaction
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DOI：
10.1002/adfm.202214529
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发表时间：
2023-05
影响因子：
19
通讯作者：
Bishan Zhang;Yan Luo;D. Xiang;Jundi Qin;Kanghua Miao;Xiufang Wang;Xiongwu Kang;Yong Tian
中科院分区：
文献类型：
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作者：
Bishan Zhang;Yan Luo;D. Xiang;Jundi Qin;Kanghua Miao;Xiufang Wang;Xiongwu Kang;Yong Tian
结构工程已被证明是一种有效的策略，用于改善氧化钌基催化剂的催化性能和降低成本，用于析氧反应（OER）。在此，通过利用Kirkendall效应制备由锌-钴-钌三元金属合金氧化物（ZnCo-RuO2/C）组成的多面体形状的蛋黄壳结构。蛋黄-壳框架和组装的金属氧化物纳米颗粒的直径分别为116.9 ± 25.9 nm和3.1 ± 0.7 nm。ZnCo-RuO2/C的多孔蛋黄壳结构暴露了丰富的活性位点，有利于OER的传质。理论计算表明，ZnCo-RuO2可以打破OER中间体的线性标度关系，并显著降低电位决定步骤的能垒，这可能是ZnCo-RuO2/C提高OER性能的原因之一。在1 m KOH水溶液电解质中，ZnCo-RuO2/C在10 mA cm − 2下的过电位仅为180 mV，塔菲尔斜率为63 mV dec − 1，上级优于单一金属掺杂的原始和商业RuO2。作为锌空气电池的阳极催化剂，ZnCo-RuO 2/C相对于商用RuO 2具有更高的功率密度和耐久性，具有很好的实际应用前景。
Structure engineering has proven to be an effective strategy for improving the catalytic performance and reducing the cost of ruthenium oxide‐based catalysts toward oxygen evolution reactions (OER). Herein, a polyhedron‐shaped yolk‐shell structure composed of zinc‐cobalt‐ruthenium ternary metal alloy oxide (ZnCo‐RuO2/C) is prepared, by taking advantage of the Kirkendall effect. The yolk‐shell frame and the ensembled metal oxide nanoparticles are 116.9 ± 25.9 nm and 3.1 ± 0.7 nm in diameter, respectively. The porous yolk‐shell structure of ZnCo‐RuO2/C exposes abundant active sites and facilitates mass transfer for OER. Theoretical calculations indicate that ZnCo‐RuO2 may break the linear scaling relationship for the OER intermediates and dramatically reduces the energy barrier of the potential determining step, which may be one of the factors that are responsible for the enhanced OER performance of ZnCo‐RuO2/C. In 1 m KOH aqueous electrolyte, ZnCo‐RuO2/C delivers an overpotential of only 180 mV at 10 mA cm−2 and a Tafel slope of 63 mV dec−1, superior to that of single metal‐doped, pristine and commercial RuO2. As an anode catalyst of zinc‐air batteries, ZnCo‐RuO2/C exhibits improved power density and durability relative to commercial RuO2, very promising for practical application.