Selective electrochemical production of hydrogen peroxide at zigzag edges of exfoliated molybdenum telluride nanoflakes.
Selective electrochemical production of hydrogen peroxide at zigzag edges of exfoliated molybdenum telluride nanoflakes.
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DOI：
10.1093/nsr/nwaa084
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发表时间：
2020-08
影响因子：
20.6
通讯作者：
Li Y
中科院分区：
文献类型：
--
作者：
Zhao X;Wang Y;Da Y;Wang X;Wang T;Xu M;He X;Zhou W;Li Y;Coleman JN;Li Y
分子氧的双电子还原是实现过氧化氢的绿色、温和和按需合成的有效策略。然而，其实际可行性取决于先进的电催化剂的开发，优选地由非贵元素组成，以选择性地加速该反应，特别是在酸性介质中。我们的研究首次将2 H-MoTe 2作为有效的非贵金属基电催化剂用于在酸中电化学生产过氧化氢。我们表明，剥离的2 H-MoTe 2纳米片具有高活性（起始过电位为140 mV，在0.4 V时与可逆氢电极相比具有27 A g−1的大质量活性），高选择性（H2 O2百分比高达93%）和在0.5 M H2SO 4中的良好稳定性。理论模拟表明，2 H-MoTe 2的高活性和高选择性是由于其锯齿形边缘处HOO* 和O* 的结合能合适，共同有利于分子氧的双电子还原而不是四电子还原。液相剥离法制备的2 H-MoTe 2纳米片对酸中氧还原为过氧化氢具有显著的电催化活性。
The two-electron reduction of molecular oxygen represents an effective strategy to enable the green, mild and on-demand synthesis of hydrogen peroxide. Its practical viability, however, hinges on the development of advanced electrocatalysts, preferably composed of non-precious elements, to selectively expedite this reaction, particularly in acidic medium. Our study here introduces 2H-MoTe2 for the first time as the efficient non-precious-metal-based electrocatalyst for the electrochemical production of hydrogen peroxide in acids. We show that exfoliated 2H-MoTe2 nanoflakes have high activity (onset overpotential ∼140 mV and large mass activity of 27 A g−1 at 0.4 V versus reversible hydrogen electrode), great selectivity (H2O2 percentage up to 93%) and decent stability in 0.5 M H2SO4. Theoretical simulations evidence that the high activity and selectivity of 2H-MoTe2 arise from the proper binding energies of HOO* and O* at its zigzag edges that jointly favor the two-electron reduction instead of the four-electron reduction of molecular oxygen. 2H-MoTe2 nanoflake prepared from liquid phase exfoliation exhibit remarkable electrocatalystic activity for oxygen reduction to hydrogen peroxide in acids.
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影响因子：
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作者：
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通讯作者：
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