Electric Strain in Dual Metal Janus Nanosheets Induces Structural Phase Transition for Efficient Hydrogen Evolution
Electric Strain in Dual Metal Janus Nanosheets Induces Structural Phase Transition for Efficient Hydrogen Evolution
复制标题
双金属 Janus 纳米片中的电应变诱导结构相变以有效析氢
DOI：
10.1016/j.joule.2019.09.006
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发表时间：
2019-12-18
期刊：
影响因子：
39.8
通讯作者：
Wu, Xinglong
中科院分区：
文献类型：
--
作者：
Fu, Yao;Shan, Yun;Wu, Xinglong
可持续能源供应的未来需要在设计廉价耐用的高效电化学水分解催化剂方面取得创新突破。与传统的掺杂、缺陷和纳米结构化策略不同，我们开发了一种简单可行的电应变方法，通过调节载流子分布来触发电催化剂的结构相变，实现优异的析氢反应（HER）性能。在此，由于我们设计的Janus MoReS 3纳米结构的固有非中心对称极化，大量载流子被有力地拉入催化剂的内部以产生电应变，导致带电MoReS 3纳米片变形并从T相转变为另一种可逆的原子构型电应变产生的T“-MoReS 3在大电流密度下显示出超过商业Pt/C电极的HER性能，在189 mV的过电位下达到150 mA cm-2的电流密度。
The future of sustainable energy supply demands innovative breakthroughs in the design of cheap and durable catalysts for efficient electrochemical water splitting. Distinct from the conventional doping, defecting, and nanostructuring strategy, we develop a simple and feasible electric-strain way to trigger electrocatalyst's structural phase transition via regulating carrier distribution, realizing an excellent hydrogen evolution reaction (HER) performance. Herein, thanks to the intrinsic noncentrosymmetric polarization of our designed Janus MoReS3 nanostructures, large numbers of carriers are energetically pulled into the catalyst's interior to generate electric strain, leading to the deformation of the charged MoReS3 nanosheets and transition from T phase to another reversible atomic configuration (T '' phase) with higher catalytic activity and faster carrier transfer- The electric-strain-generated T ''-MoReS3 shows HER performances in excess of a commercial Pt/C electrode at large current densities, reaching a current density of 150 mA cm(-2) at an overpotential of 189 mV.