Influence of Vanadate Structure on Electrochemical Surface Reconstruction and OER Performance of CoV2O6 and Co3V2O8,ACS Applied Energy Materials

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Influence of Vanadate Structure on Electrochemical Surface Reconstruction and OER Performance of CoV2O6 and Co3V2O8
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2021-05-17 , DOI: 10.1021/acsaem.1c00701
Ayan Mondal ₁ , Sagar Ganguli ₁ , Harish Reddy Inta ₁ , Venkataramanan Mahalingam ₁

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Underlying factors responsible for superior phase-dependent electrocatalytic OER activity of crystalline Co-vanadates are investigated. Previous reports on Co-vanadates ascribed activity differences to optimal metal–oxygen bond strength. In contrast, we found etching of vanadate from precatalyst during electrochemical activation to be the primary contributor. The resulting higher surface reconstruction exposes a higher number of catalytically active cobalt sites that otherwise lay inactive due to their position in bulk. Co-vanadates with polymeric vanadates (CoV₂O₆) showed better OER over monomeric orthovanadates (Co₃V₂O₈) due to higher vanadate etching. Further, this work validates that etching can happen even from lattice positions, where bonding between constituents is strong.

中文翻译：

钒酸盐结构对CoV ₂ O ₆和Co ₃ V ₂ O ₈电化学表面重建和OER性能的影响

研究了导致结晶钴钒酸盐具有优异的相依赖性电催化 OER 活性的潜在因素。先前关于钴钒酸盐的报告将活性差异归因于最佳金属-氧键强度。相比之下，我们发现电化学活化过程中从预催化剂蚀刻钒酸盐是主要贡献者。由此产生的更高的表面重建暴露了更多的催化活性钴位点，否则这些位点由于它们的位置而处于非活性状态。与聚合钒酸盐 (CoV ₂ O ₆ ) 的共钒酸盐比单体原钒酸盐(Co ₃ V ₂ O ₈ ) 表现出更好的 OER) 由于较高的钒酸盐蚀刻。此外，这项工作验证了蚀刻甚至可以从晶格位置发生，其中成分之间的结合很强。

更新日期：2021-06-28

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