Self-Activated Catalytic Sites on Nanoporous Dilute Alloy for High-Efficiency Electrochemical Hydrogen Evolution
Self-Activated Catalytic Sites on Nanoporous Dilute Alloy for High-Efficiency Electrochemical Hydrogen Evolution
复制标题
纳米多孔稀合金上的自激活催化位点用于高效电化学析氢
DOI：
10.1021/acsnano.0c10885
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发表时间：
2021
期刊：
影响因子：
17.1
通讯作者：
Tan Yongwen
中科院分区：
文献类型：
--
作者：
Yu Yaqian;Jiang Kang;Luo Min;Zhao Yang;Lan Jiao;Peng Ming;de Groot Frank M. F.;Tan Yongwen
设计和合成适用于宽pH环境的高效析氢电催化剂是降低水槽能量损失的关键。在这里，我们使用自活化策略，构建了一种原子镍(Ni)修饰的纳米多孔Ir(Ir)催化剂，它可以创造有利于反应的化学环境，并最大化电化学活性表面积(ECSA)，使其在较宽的pH范围内保持高效。通过X-射线吸收光谱和理论计算，确定了Ni原子是协同中心，它不仅在操作条件下加速了水的解离，而且还激活了表面Ir中心，从而有效地产生了H_2。这项工作突出了原子级修饰策略的重要性，它可以在可以忽略ECSA牺牲的情况下优化表面Ir原子的活性。
Design and synthesis of effective electrocatalysts for hydrogen evolution reaction (HER) in wide pH environments are critical to reduce energy losses in water electrolyzers. Here, by using a self-activation strategy, we construct an atomic nickel (Ni) decorated nanoporous iridium (Ir) catalyst, which can create the reaction-favorable chemical environment and maximize the electrochemical active surface area (ECSA), enabling efficient HER over a wide pH range. By usingoperandoX-ray absorption spectroscopy and theoretical calculations, the atomic Ni sites are identified as the synergistic sites, which not only accelerate the water dissociation under operation conditions but also activate the surface Ir sites thus leading to the efficient H2generation. This work highlights the significance of atomic-level decorating strategy which can optimize the activity of surface Ir atoms with negligible sacrifice of the ECSA.