Yiming Yang, Jia Xu, Yaxin Lai, Tao Wang, Lvlv Ji, Zhun Liu, Sheng Wang
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引用次数: 0
摘要
用热力学上有利的肼氧化反应（HzOR）取代氧进化反应是节能制氢（H）的有效策略，但电力输入仍然不可或缺。本文提出了一种不对称肼水燃料电池（HWFC），它将碱性肼氧化反应和酸性氢进化反应（HER）结合在一起，从而实现了氢气和电力的同时产生，并进一步获得了电化学中和能量。通过电纺丝辅助合成策略制备了嵌入碳纳米纤维的异质结构 RuTe-Ru 纳米粒子（RuTe-Ru@CNFs），显示出卓越的 HER 和 HzOR 催化性能。RuTe-Ru@CNFs||RuTe-Ru@CNFs 的不对称 HWFC 的开路电压为 0.95 V，在 48.7 mA cm 时的最大功率密度为 17.1 mW cm。理论研究阐明了 RuTe-Ru 异质界面上的莫特-肖特基效应，从而为内在催化增强提供了良好的调制电子结构。此外，整个合成策略还可用于制造其他过渡金属碲基和硒化钌基纳米纤维，以实现各种潜在应用。
Interfacial engineering of RuTe2-Ru for co-generation of hydrogen and electricity
Replacing oxygen evolution reaction with thermodynamic favored hydrazine oxidation reaction (HzOR) is an effective strategy for energy-saving hydrogen (H) production, although electricity input remains indispensable. Herein, an asymmetric hydrazine-water fuel cell (HWFC) is presented by coupling alkaline HzOR and acidic hydrogen evolution reaction (HER), thereby achieving co-generation of H and electricity output further reaping the electrochemical neutralization energy. Heterostructured RuTe-Ru nanoparticles embedded in carbon nanofibers (RuTe-Ru@CNFs) is fabricated by an electrospinning-assisted synthetic strategy, showing superior HER and HzOR catalytic performance. The asymmetric HWFC of RuTe-Ru@CNFs||RuTe-Ru@CNFs delivers an open-circuit voltage of 0.95 V with a maximum power density of 17.1 mW cm at 48.7 mA cm. Theoretical investigations elucidate the Mott-Schottky effect at the RuTe-Ru heterointerface, leading to the well-modulated electronic structure for the intrinsic catalytic enhancement. Moreover, the overall synthetic strategy is generalized to fabricate other transition metal tellurides-based and Ru selenides-based nanofibers for various potential applications.
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