Tungsten Oxide/Reduced Graphene Oxide Aerogel with Low-Content Platinum as High-Performance Electrocatalyst for Hydrogen Evolution Reaction,Small

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Tungsten Oxide/Reduced Graphene Oxide Aerogel with Low-Content Platinum as High-Performance Electrocatalyst for Hydrogen Evolution Reaction
Small ( IF 13.0 ) Pub Date : 2021-07-30 , DOI: 10.1002/smll.202102159
Yi Li ₁ , Kaiyue Jiang ₂ , Jing Yang ₁ , Yuanyuan Zheng ₁ , René Hübner ₃ , Zhaowei Ou ₄ , Xin Dong ₄ , Lanqi He ₄ , Honglei Wang ₄ , Jian Li ₁ , Yujing Sun ₁ , Xubing Lu ₅ , Xiaodong Zhuang ₂ , Zhikun Zheng ₄ , Wei Liu ₁

Affiliation

Designing cost-effective, highly active, and durable platinum (Pt)-based electrocatalysts is a crucial endeavor in electrochemical hydrogen evolution reaction (HER). Herein, the low-content Pt (0.8 wt%)/tungsten oxide/reduced graphene oxide aerogel (LPWGA) electrocatalyst with excellent HER activity and durability is developed by employing a tungsten oxide/reduced graphene oxide aerogel (WGA) obtained from a facile solvothermal process as a support, followed by electrochemical deposition of Pt nanoparticles. The WGA support with abundant oxygen vacancies and hierarchical pores plays the roles of anchoring the Pt nanoparticles, supplying continuous mass transport and electron transfer channels, and modulating the surface electronic state of Pt, which endow the LPWGA with both high HER activity and durability. Even under a low loading of 0.81 μg_Pt cm⁻², the LPWGA exhibits a high HER activity with an overpotential of 42 mV at 10 mA cm⁻², an excellent stability under 10000-cycle cyclic voltammetry and 40 h chronopotentiometry at 10 mA cm⁻², a low Tafel slope (30 mV dec⁻¹), and a high turnover frequency of 29.05 s⁻¹ at η = 50 mV, which is much superior to the commercial Pt/C and the low-content Pt/reduced graphene oxide aerogel. This work provides a new strategy to design high-performance Pt-based electrocatalysts with greatly reduced use of Pt.

中文翻译：

具有低含量铂的氧化钨/还原氧化石墨烯气凝胶作为析氢反应的高性能电催化剂

设计具有成本效益、高活性和耐用的铂 (Pt) 基电催化剂是电化学析氢反应 (HER) 的一项关键工作。在此，通过使用从简便的溶剂热法获得的氧化钨/还原氧化石墨烯气凝胶（WGA），开发了具有优异 HER 活性和耐久性的低含量 Pt（0.8 wt%）/氧化钨/还原氧化石墨烯气凝胶（LPWGA）电催化剂。工艺作为载体，然后电化学沉积铂纳米颗粒。具有丰富氧空位和分级孔的 WGA 载体起到锚定 Pt 纳米粒子、提供连续传质和电子传递通道以及调节 Pt 表面电子状态的作用，这使 LPWGA 具有高 HER 活性和耐久性。即使在 0.81 μg 的低负载下_Pt cm ^-2，LPWGA 表现出高 HER 活性，在 10 mA cm ^-2下具有 42 mV 的过电位，在 10000 循环循环伏安法和 10 mA cm ^{-2 下的}40 h 计时电位下具有出色的稳定性，低 Tafel 斜率（ 30 mV dec ^-1 )，以及在 η = 50 mV时 29.05 s ^-1的高周转频率，这远优于商业 Pt/C 和低含量 Pt/还原氧化石墨烯气凝胶。这项工作为设计高性能 Pt 基电催化剂提供了一种新策略，大大减少了 Pt 的使用。

更新日期：2021-09-16

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