School of Chemistry and Materials Science, State Key Laboratory of Fire Science (SKLFS), iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), CAS Center for Excellence in Nanoscience and CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China.
Angew Chem Int Ed Engl. 2016 Feb 12;55(7):2488-92. doi: 10.1002/anie.201511032. Epub 2016 Jan 12.
Developing highly active catalysts for the oxygen evolution reaction (OER) is of paramount importance for designing various renewable energy storage and conversion devices. Herein, we report the synthesis of a category of Co-Pi analogue, namely cobalt-based borate (Co-Bi ) ultrathin nanosheets/graphene hybrid by a room-temperature synthesis approach. Benefiting from the high surface active sites exposure yield, enhanced electron transfer capacity, and strong synergetic coupled effect, this Co-Bi NS/G hybrid shows high catalytic activity with current density of 10 mA cm(-2) at overpotential of 290 mV and Tafel slope of 53 mV dec(-1) in alkaline medium. Moreover, Co-Bi NS/G electrocatalysts also exhibit promising performance under neutral conditions, with a low onset potential of 235 mV and high current density of 14.4 mA cm(-2) at 1.8 V, which is the best OER performance among well-developed Co-based OER electrocatalysts to date. Our finding paves a way to develop highly active OER electrocatalysts.
开发高效的氧气析出反应 (OER) 催化剂对于设计各种可再生能源存储和转换设备至关重要。在此，我们报告了一类钴-磷化物类似物，即通过室温合成方法合成的钴基硼酸盐 (Co-Bi ) 超薄纳米片/石墨烯杂化物。得益于高的表面活性位点暴露产率、增强的电子传递能力和强协同耦合效应，这种 Co-Bi NS/G 杂化物在碱性介质中具有高的催化活性，在 290 mV 的过电势下电流密度为 10 mA cm(-2)，塔菲尔斜率为 53 mV dec(-1)。此外，Co-Bi NS/G 电催化剂在中性条件下也表现出良好的性能，在 1.8 V 时具有低的起始电位 235 mV 和高的电流密度 14.4 mA cm(-2)，这是目前为止开发的最先进的基于 Co 的 OER 电催化剂中最好的 OER 性能。我们的发现为开发高效的 OER 电催化剂开辟了一条途径。
