Phase engineering of dual active 2D Bi2O3-based nanocatalysts for alkaline hydrogen evolution reaction electrocatalysis
Phase engineering of dual active 2D Bi2O3-based nanocatalysts for alkaline hydrogen evolution reaction electrocatalysis
复制标题
用于碱性析氢反应电催化的双活性二维 Bi2O3 纳米催化剂的相工程
DOI：
10.1039/d1ta09019d
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发表时间：
2022
影响因子：
11.9
通讯作者：
Sun Ziqi
中科院分区：
文献类型：
--
作者：
Wu Ziyang;Mei Jun;Liu Qiong;Wang Sen;Li Wei;Xing Shihui;Bai Juan;Yang Jianping;Luo Wei;Guselnikova Olga;O'Mullane Anthony P.;Gu Yuantong;Yamauchi Yusuke;Liao Ting;Sun Ziqi
在电化学水裂解中，水解离步骤和氢在催化剂上的吸附之间的平衡是一个持续的挑战。在此，Bi 2 O3，一种由于其不利的氢吸附吉布斯自由能（ΔGH*）而导致的用于析氢反应（HER）的非活性催化剂，通过原位相工程策略来活化，以在碱性介质中有效地进行HER电催化。通过这种方法，制备了Bi 2 O3纳米片（BixNi合金相和α-Bi 2 O3），并将其用于催化碱性HER反应中的水分解和氢生成，结合了Bi 2 O3纳米片和双活性中心的优点，该相工程催化剂具有更好的碱性HER反应性能.调制催化剂在1 M KOH中表现出127 mV的过电位（j = 10 mA cm-2）和92 mV dec-1的塔菲尔斜率，与其他Bi 2 O3基HER电催化剂相比是非常出色的。这项工作不仅提供了一种创新的方法来激活HER-劣势铋基催化剂，而且还为设计用于缓慢碱性HER催化的双活性催化剂提供了新的见解。
In electrochemical water splitting, the balance between water dissociation step and the hydrogen adsorption on the catalysts is an ongoing challenge. Herein, Bi2O3, an inactive catalyst for the hydrogen evolution reaction (HER) caused by its unfavourable hydrogen adsorption Gibbs free energy (ΔGH*), is activated by an in situ phase engineering strategy for efficient HER electrocatalysis in alkaline media. Through this strategy, two-dimensional (2D) dual active Bi2O3 nanosheets with both BixNi alloy phases and α-Bi2O3 were fabricated to simultaneously catalyse the water dissociation step and the hydrogen formation step during an alkaline HER. In combination with the advantages of 2D nanomaterials and dual active catalytic sites, this phase engineered Bi2O3-based catalyst exhibited much improved alkaline HER performance. The modulated catalyst demonstrated an overpotential of 127 mV (at j = 10 mA cm−2) and a Tafel slope of 92 mV dec−1 in 1 M KOH, and is exceptional compared with other Bi2O3-based HER electrocatalysts. This work not only provides an innovative way to activate HER-inferior bismuth-based catalysts, but also offers new insights into the design of dual active catalysts for sluggish alkaline HER catalysis.