中文摘要：

nanostructured 转变金属 dichalcogenides (TMD ) 的开发材料作为氧的新奇 electrocatalyst 候选人，减小反应(ORR ) 是新策略支持非宝贵的金属 ORR 催化剂的开发。在这个工作，一三维(3D ) 像玫瑰花蕾的 MoSe ₂ nanostructures 的混血儿在减少的 graphene 上支持了氧化物(rGO ) nanosheets 成功地通过灵巧的热水的策略被综合。混合 nanostructure 显示出的准备 MoSe ₂@rGO 与纯 MoSe ₂, rGO ，和他们的简单物理混合的相比在碱的媒介为 ORR 提高了 electrocatalytic 活动，它能得益于 ultrathin MoSe ₂层的富有地暴露的活跃的边地点的优秀的氧吸附能力，传导性和 rGO 站台的限制聚集的效果，以及唯一的 3D 混合材料的像玫瑰花蕾的建筑学。向 ORR 的 MoSe ₂@rGO 混血儿的 electrocatalytic 活动比得上商业 Pt/C 催化剂的。并且支持的反应被揭示包含一将近，由获得的 Koutecky-Levich 的分析的 four-electron-dominated ORR 过程阴谋。扫描电气化学的显微镜学( SECM )技术与在一个单个实验与高空间的分辨率和不同催化剂的同时评估的活动样品的本地催化活动调查的优点，进一步被使用调查 MoSe ₂@rGO 的本地 ORR electrocatalytic 活动并且通过使用不同样品潜力另外的催化剂样品把它与那些作比较。优秀稳定性和对甲醇的 3D nanostructured MoSe ₂@rGO 混血儿的甲醇忍耐进一步在燃料房间和金属空气电池在潜在的应用程序的碱的答案作为有希望的 ORR electrocatalyst 证明 3D nanostructured MoSe ₂@rGO 混合。

英文摘要：

Developments of nanostructured transition metal dichalcogenides （TMDs） materials as novel electrocatalyst candidates for oxygen reduction reaction （ORR） is a new strategy to promote the developments of non-precious metal ORR catalysts. In this work, a three-dimensional （3D） hybrid of rosebud-like MoSe2 nanostructures supported on reduced graphene oxide （rGO） nanosheets was successfully synthesized through a facile hydrothermal strategy. The prepared MoSe2@rGO hybrid nanostructure showed enhanced electrocatalytic activity for the ORR in alkaline medium compared to that of the pure MoSe2, rGO, and their simple physical mixture, which could benefit from the excellent oxygen adsorption ability of the abundantly exposed active edge sites of the ultrathin MoSe2 layers, the conductivity and aggregation-limiting effect of the rGO platform, as well as the unique 3D rosebud-like architecture of the hybrid material. The electrocatalytic activity of the MoSe2@rGO hybrid towards ORR was comparable to that of com- inertial Pt/C catalysts. And the promoted reaction was revealed to involve a nearly four-electron-dominated ORR process by analysis of the obtained Koutecky- Levich plots. The scanning electrochemical microscopy （SECM） technique, with the advantages of investigating of the local catalytic activity of samples with high spatial resolution and simultaneously evaluating activities of different catalysts in a single experiment, was further applied to investigate the local ORR electrocatalytic activity of MoSe2@rGO and compare it with those of other catalyst samples through applying different sample potentials. The excellent stability and methanol tolerance of the 3D nanostructured MoSe2@rGO hybrid against methanol further prove the 3D nanostructured MoSe2@rGO hybrid as a promising ORR electrocatalyst in alkaline solution for potential applications in fuel cells and metal-air batteries.