采用简单的水热合成法制备了氧化钼(MoO_3)/石墨烯(GNS)/碳纳米管(CNT)复合材料。用扫描电子显微镜(SEM)和X射线衍射仪(XRD)表征了材料的形貌和结构。用循环伏安(CV)和线性扫描(LSV)测试了材料的氧还原催化性能,结果发现,复合材料的氧...采用简单的水热合成法制备了氧化钼(MoO_3)/石墨烯(GNS)/碳纳米管(CNT)复合材料。用扫描电子显微镜(SEM)和X射线衍射仪(XRD)表征了材料的形貌和结构。用循环伏安(CV)和线性扫描(LSV)测试了材料的氧还原催化性能,结果发现,复合材料的氧还原电流和起始电位均大大优于单一的MoO_3,表现出较好的催化性能。含有3mg·cm^(-2) MoO_3/GNS/CNT复合材料作为阴极催化剂的MFC最大功率密度为510 m W·m^(-2),达到商业铂碳的83%。因此,廉价的MoO_3/GNS/CNT复合材料作为MFC阴极氧还原催化剂具有巨大的应用潜力。展开更多
Noble metals, such as platinum, ruthenium and iridium‐group metals, are often used as oxygen reduction or evolution reaction (ORR/OER) electrocatalysts. To reduce the cost and provide an application of bifunctional...Noble metals, such as platinum, ruthenium and iridium‐group metals, are often used as oxygen reduction or evolution reaction (ORR/OER) electrocatalysts. To reduce the cost and provide an application of bifunctional catalysis, in this work, cobalt oxide supported on nitrogen and phospho‐rus co‐doped carbon (Co3O4/NPC) was fabricated and examined as a bifunctional electrocatalyst for OER and ORR. To prepare Co3O4/NPC, NPC was pyrolyzed from melamine and phytic acid support‐ed on carbon, followed by the solvothermal synthesis of Co3O4 on NPC. Linear sweep voltammetry was used to evaluate the activity for OER and ORR. For OER, Co3O4/NPC showed an onset potential of 0.54 V (versus the saturated calomel electrode) and a current density of 21.95 mA/cm2 at 0.80 V, which was better than both Co3O4/C and NPC. The high activity of Co3O4/NPC was attributed to a synergistic effect of the N, P co‐dopants and Co3O4. For ORR, Co3O4/NPC exhibited an activity close to commercial Pt/C in terms of the diffusion limited current density (–4.49 vs–4.76 mA/cm2 at–0.80 V), and Co3O4 played the key role for the catalysis. Chronoamperometry (current versus time) was used to evaluate the stability, which showed that Co3O4/NPC maintained 46%current after the chronoamperometry test for OER and 95% current for ORR. Overall, Co3O4/NPC exhibited high activity and improved stability for both OER and ORR.展开更多
文摘采用简单的水热合成法制备了氧化钼(MoO_3)/石墨烯(GNS)/碳纳米管(CNT)复合材料。用扫描电子显微镜(SEM)和X射线衍射仪(XRD)表征了材料的形貌和结构。用循环伏安(CV)和线性扫描(LSV)测试了材料的氧还原催化性能,结果发现,复合材料的氧还原电流和起始电位均大大优于单一的MoO_3,表现出较好的催化性能。含有3mg·cm^(-2) MoO_3/GNS/CNT复合材料作为阴极催化剂的MFC最大功率密度为510 m W·m^(-2),达到商业铂碳的83%。因此,廉价的MoO_3/GNS/CNT复合材料作为MFC阴极氧还原催化剂具有巨大的应用潜力。
基金supported by the National Natural Science Foundation of China (21375016,20475022 and 21505019)~~
文摘Noble metals, such as platinum, ruthenium and iridium‐group metals, are often used as oxygen reduction or evolution reaction (ORR/OER) electrocatalysts. To reduce the cost and provide an application of bifunctional catalysis, in this work, cobalt oxide supported on nitrogen and phospho‐rus co‐doped carbon (Co3O4/NPC) was fabricated and examined as a bifunctional electrocatalyst for OER and ORR. To prepare Co3O4/NPC, NPC was pyrolyzed from melamine and phytic acid support‐ed on carbon, followed by the solvothermal synthesis of Co3O4 on NPC. Linear sweep voltammetry was used to evaluate the activity for OER and ORR. For OER, Co3O4/NPC showed an onset potential of 0.54 V (versus the saturated calomel electrode) and a current density of 21.95 mA/cm2 at 0.80 V, which was better than both Co3O4/C and NPC. The high activity of Co3O4/NPC was attributed to a synergistic effect of the N, P co‐dopants and Co3O4. For ORR, Co3O4/NPC exhibited an activity close to commercial Pt/C in terms of the diffusion limited current density (–4.49 vs–4.76 mA/cm2 at–0.80 V), and Co3O4 played the key role for the catalysis. Chronoamperometry (current versus time) was used to evaluate the stability, which showed that Co3O4/NPC maintained 46%current after the chronoamperometry test for OER and 95% current for ORR. Overall, Co3O4/NPC exhibited high activity and improved stability for both OER and ORR.