Superaerophobic Ultrathin Ni-Mo Alloy Nanosheet Array from In Situ Topotactic Reduction for Hydrogen Evolution Reaction
Superaerophobic Ultrathin Ni-Mo Alloy Nanosheet Array from In Situ Topotactic Reduction for Hydrogen Evolution Reaction
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用于析氢反应的原位拓扑还原超疏气超薄镍钼合金纳米片阵列
DOI：
10.1002/smll.201701648
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发表时间：
2017
期刊：
影响因子：
13.3
通讯作者：
Sun Xiaoming
中科院分区：
文献类型：
--
作者：
Zhang Qian;Li Pengsong;Zhou Daojin;Chang Zheng;Kuang Yun;Sun Xiaoming
析氢反应（HER）有成为清洁可再生制氢技术的前景，而Ni-Mo合金是碱性电解质中最好的析氢反应催化剂之一。本文报道了一种原位拓扑还原法制备用于电催化析氢的超薄二维Ni-Mo合金纳米片。由于其超薄结构和定制的成分，合成的Ni-Mo合金显示出35 mV的过电位，达到10 mA cm - 2的电流密度，以及45 mV 10 - 1的Tafel斜率，显示出与最先进的商业Pt/C催化剂相当的固有活性。此外，二维NiMo纳米片在导电衬底上的垂直排列组装结构使电极具有“超疏氧性”，从而导致HER过程中更快的气泡释放，因此在高电流密度下，与在相同衬底上滴干Pt/C催化剂相比，表现出更快的传质行为。这种原位拓扑转换为设计和制造低成本、富土的非贵金属超薄二维纳米结构提供了一种方法，用于电催化问题。
Hydrogen evolution reaction (HER) has prospect to becoming clean and renewable technology for hydrogen production and Ni–Mo alloy is among the best HER catalysts in alkaline electrolytes. Here, an in situ topotactic reduction method to synthesize ultrathin 2D Ni–Mo alloy nanosheets for electrocatalytic hydrogen evolution is reported. Due to its ultrathin structure and tailored composition, the as‐synthesized Ni–Mo alloy shows an overpotential of 35 mV to reach a current density of 10 mA cm−2, along with a Tafel slope of 45 mV decade−1, demonstrating a comparable intrinsic activity to state‐of‐art commercial Pt/C catalyst. Besides, the vertically aligned assemble structure of the 2D NiMo nanosheets on conductive substrate makes the electrode “superaerophobic,” thus leading to much faster bubble releasing during HER process and therefore shows faster mass transfer behavior at high current density as compared with drop drying Pt/C catalyst on the same substrate. Such in situ topotactic conversion finds a way to design and fabricate low‐cost, earth‐abundant non‐noble metal based ultrathin 2D nanostructures for electrocatalytic issues.