Tri-metallic phytate in situ electrodeposited on 3D Ni foam as a highly efficient electrocatalyst for enhanced overall water splitting
Tri-metallic phytate in situ electrodeposited on 3D Ni foam as a highly efficient electrocatalyst for enhanced overall water splitting
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DOI：
10.1039/c7ta05386j
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发表时间：
2017-09
影响因子：
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通讯作者：
Xiaojuan Chen;Panpan Li;Zhaoyu Jin;Yan Meng;Hongyan Yuan;D. Xiao
中科院分区：
文献类型：
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作者：
Xiaojuan Chen;Panpan Li;Zhaoyu Jin;Yan Meng;Hongyan Yuan;D. Xiao
通过在含有Co和Fe金属离子的植酸钠中的电化学腐蚀，在泡沫镍上原位制备了一种互联催化剂结构。在N-PHY体系中引入Co和Fe，使植酸根离子与更多的活性金属离子相连，形成丰富的催化中心，从而提高了水氧化性能，同时也提高了整体的裂水活性。结果表明，这种自支撑的C6FN-PHY电极具有高电流密度200 mA cm−2，在1M KOH中制氧的过电位为285 mV，析氢过电位为327 mV，超过了最近报道的大多数催化剂。此外，其电催化活性可保持至少45h，且电势略有增加，具有广泛的工业应用前景。此外，采用C6FN-PHY作为阴极和阳极，在1.91V下获得了100 mA cm−_2的电流密度，与铂/碳和RuO_2的综合性能相当。最重要的是，C6FN-PHY作为OER和HER催化剂的多次交替计时电势测试也验证了该电极作为真正的双功能电催化剂的高效性和坚固的耐用性。
An interconnected catalyst architecture has been in situ fabricated on Ni foam through facile electrochemical corrosion in sodium phytate containing Co and Fe metal ions. The introduction of Co and Fe in the N-phy system enables the phytate ions to link more active metal ions and then creates abundant catalytic sites to enhance the water oxidation performance and simultaneously to improve the overall water splitting activity. As a result, this self-supported C6FN-phy electrode delivers a high current density of 200 mA cm−2 at an overpotential of 285 mV for oxygen production and at 327 mV for hydrogen evolution in 1 M KOH, surpassing most catalysts recently reported. Besides, the electrocatalytic activity can be maintained for at least 45 h with a subtle potential increase, illustrating the versatile and practical application in industry. What's more, we achieve a current density of 100 mA cm−2 at 1.91 V by using C6FN-phy as the cathode and anode for overall water splitting, which is well comparable to the integrated performance of Pt/C and RuO2. Most importantly, multiple alternating chronopotentiometric tests of C6FN-phy as both the OER and the HER catalyst also verify the high availability and robust durability of the electrode as a true bifunctional electrocatalyst.