A hierarchical oxygen vacancy-rich WO3 with “nanowire-array-on-nanosheet-array” structure for highly efficient oxygen evolution reaction†,Journal of Materials Chemistry A

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A hierarchical oxygen vacancy-rich WO3 with “nanowire-array-on-nanosheet-array” structure for highly efficient oxygen evolution reaction†
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2019-02-16 00:00:00 , DOI: 10.1039/c9ta01044k
Jinxiang Diao _{1,

2,

3,

4,

5} , Wenyu Yuan _{4,

5,

6,

7,

8} , Yu Qiu _{1,

2,

3,

4,

5} , Laifei Cheng _{4,

5,

6,

7} , Xiaohui Guo _{1,

2,

3,

4,

5}

Affiliation

The search for highly efficient non-noble metal-based catalysts for the oxygen evolution reaction (OER) has received growing attention. Herein, we demonstrate a hierarchical oxygen vacancy-rich WO₃ with “nanowire array on nanosheet array” (WO₃ NWA-NSA) structure as a highly efficient catalyst for the OER. The vertical structure can not only highly improve the mass loading of WO₃ catalysts on Ni foam, but also provide efficient paths and channels for electron and mass transfer, leading to superior catalytic activity. Besides, the oxygen vacancies in WO₃ further promote the OER activity. The as-prepared WO₃ NWA-NSA catalyst requires an extremely low overpotential of 0.23 V to achieve a benchmark of 10 mA cm⁻², with a Tafel slope of only 33 mV dec⁻¹, superior to most reported state-of-the-art nonprecious metal-based catalysts and noble oxide catalysts. Further theoretical modeling calculations indicate that the electronic structure of WO₃ with oxygen vacancies fits extremely well with the requirements of OER catalysts. This facile strategy provides a new avenue toward the hierarchical design of electrocatalysts, and our research opens a brand-new field for the applications of WO₃.

中文翻译：

具有“纳米线阵列在纳米片阵列上”结构的分级富氧空缺WO ₃，可实现高效的氧气逸出反应†

寻找用于氧气析出反应（OER）的高效非贵金属基催化剂的问题已引起越来越多的关注。在这里，我们展示了具有“ Nanowire array on nanosheet array”（WO ₃ NWA-NSA）结构的分层富氧空缺WO ₃，作为OER的高效催化剂。垂直结构不仅可以极大地提高Ni泡沫上WO ₃催化剂的质量负载，而且还提供了有效的电子和质量转移途径和通道，从而实现了出色的催化活性。此外，WO _3中的氧空位进一步促进了OER活性。所制备的WO ₃ NWA-NSA催化剂需要极低的0.23 V过电势才能达到10 mA cm的基准^－2的Tafel斜率仅为decm-^1的33 mV，优于大多数报道的最先进的非贵金属基催化剂和贵金属氧化物催化剂。进一步的理论模型计算表明，具有氧空位的WO₃的电子结构非常符合OER催化剂的要求。这种简便的策略为电催化剂的分层设计提供了新途径，我们的研究为WO₃的应用开辟了一个崭新的领域。

更新日期：2019-02-16

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