In this work, cobalt glycerate (CoG@F127) nanosheets grown on the surface of graphene oxide (GO), i.e. CoG@F127/GO, have been synthesized with the assistance of nonionic surfactant Pluronic F127 via a hydrothermal method. After calcination, CoG@F127/GO is transformed into one derivative, Co nanoparticles coated with a trace amount of carbon (Co-C) on GO (Co-C/GO). The Co nanoparticles consist of an atypical core–shell structure, in which the core and the shell are both Co. Co-C anchored on GO can avoid the nanoparticles aggregation and expose more active sites for hydrogen evolution reaction (HER) to significantly improve the catalyst activity of HER. CoG@F127/GO is phosphatized to form the other derivate, cobalt pyrophosphate coated with a small amount of carbon (Co₂P₂O₇-C) on GO (Co₂P₂O₇-C/GO). Co₂P₂O₇-C/GO composite owns a large electrochemical active surface area (ECSA) and fast rate towards oxygen evolution reaction (OER). Furthermore, the two derivatives of CoG@F127/GO, i.e. Co-C/GO and Co₂P₂O₇-C/GO as twin flowers, are assembled into an overall water splitting electrolytic cell with a cell voltage of 1.56 V to deliver a current density of 10 mA cm⁻².

在这项工作中，借助于水热法在非离子表面活性剂Pluronic F127的帮助下合成了在氧化石墨烯（GO）表面生长的甘油酸钴（CoG @ F127）纳米片，即CoG @ F127 / GO。煅烧后，将CoG @ F127 / GO转化为一种衍生物，即在GO上涂有痕量碳（Co-C）的Co纳米颗粒（Co-C / GO）。Co纳米颗粒由非典型的核-壳结构组成，其中核和壳均为Co。Co-C锚固在GO上可避免纳米颗粒聚集并暴露更多的氢释放反应（HER）活性位点，从而显着改善氢HER的催化剂活性。CoG @ F127 / GO被磷酸化后形成另一种衍生物，焦磷酸钴涂有少量碳（Co ₂ P ₂ O ₇-C）转到GO（Co ₂ P ₂ O ₇ -C / GO）。Co ₂ P ₂ O ₇ -C / GO复合材料具有较大的电化学活性表面积（ECSA）和快速的析氧反应速率（OER）。此外，将CoG @ F127 / GO的两种衍生物，即Co-C / GO和Co ₂ P ₂ O ₇ -C / GO作为双花，组装到电池电压为1.56 V至提供10 mA cm ^-2的电流密度。