Tungsten Oxide/Reduced Graphene Oxide Aerogel with Low-Content Platinum as High-Performance Electrocatalyst for Hydrogen Evolution Reaction
Tungsten Oxide/Reduced Graphene Oxide Aerogel with Low-Content Platinum as High-Performance Electrocatalyst for Hydrogen Evolution Reaction
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低含量铂氧化钨/还原氧化石墨烯气凝胶作为析氢反应的高性能电催化剂
作者：
Li Yi;Jiang Kaiyue;Yang Jing;Zheng Yuanyuan;Huebner Rene;Ou Zhaowei;Dong Xin;He Lanqi;Wang Honglei;Li Jian;Sun Yujing;Lu Xubing;Zhuang Xiaodong;Zheng Zhikun;Liu Wei
设计高性价比、高活性、耐用的铂基电催化剂是电化学析氢反应（HER）研究的关键。本文采用简单溶剂热法获得的氧化钨/还原氧化石墨烯气凝胶（WGA）作为载体，然后电化学沉积Pt纳米颗粒，开发出具有优异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。WGA载体具有丰富的氧空位和分层孔隙，能够锚定Pt纳米粒子，提供连续的质量传递和电子传递通道，并调节Pt的表面电子态，从而使LPWGA具有较高的HER活性和耐久性。即使在0.81 μgPtcm−2的低负载下，LPWGA也表现出高的HER活性，在10 mA cm−2下的过电位为42 mV，在10 mA cm−2下的10000次循环伏安法和40 h时电位法下的优异稳定性，低Tafel斜率（30 mV dec−1），以及在η = 50 mV时的29.05 s−1的高周转频率，远远优于商用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的策略，大大减少了Pt的使用。
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 μgPtcm−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−1at 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.