Constructing a Highly Active Amorphous WO3/Crystalline CoP Interface for Enhanced Hydrogen Evolution at Different pH Values,ACS Applied Energy Materials

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Constructing a Highly Active Amorphous WO3/Crystalline CoP Interface for Enhanced Hydrogen Evolution at Different pH Values
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2022-09-15 , DOI: 10.1021/acsaem.2c01489
Wenhao Liu ₁ , Huimin Zhang ₁ , Mengyao Ma ₁ , Dong Cao ₁ , Daojian Cheng ₁

Affiliation

Hydrogen evolution through electrolysis of water is an effective approach to the current energy shortage, attracting extensive research attention. Herein, we constructed an amorphous WO₃/crystalline CoP (WO₃/CoP) heterostructure electrocatalyst by a facile two-step hydrothermal method followed by low-temperature phosphatization. Results of the electrocatalytic performance test revealed that WO₃/CoP displays extraordinarily robust stability and efficient hydrogen evolution reaction (HER) activity, which only needs overpotentials of 49 and 69 mV to deliver a current density of 10 mA cm^–2 in alkaline and acid medium, respectively. Further studies confirmed that amorphous WO₃ is wrapped around crystalline CoP and the rich amorphous–crystalline heterojunction interfaces directly optimized the adsorption energy of the intermediate by the downshift of P 2p and upshift of Co 2p orbits. Moreover, the interface between the amorphous WO₃ and crystalline CoP is essential to boost the reaction kinetics because the amorphous phase with many unsaturated bonds directly facilitates the adsorption of reactants and crystalline CoP with superior conductivity accelerates the transfer of electrons. This study provides a facile and feasible approach for constructing a crystalline/amorphous heterojunction catalyst for hydrogen generation.

中文翻译：

构建高活性无定形 WO3/Crystalline CoP 界面以增强不同 pH 值下的氢析出

电解水制氢是解决当前能源短缺的有效途径，引起了广泛的研究关注。在此，我们通过简便的两步水热法随后低温磷化构建了无定形WO ₃ /结晶CoP（WO _{3 /CoP）异质结构电催化剂。}电催化性能测试结果表明，WO ₃ /CoP 表现出异常稳健的稳定性和高效的析氢反应 (HER) 活性，仅需要 49 和 69 mV 的过电位即可在碱性和酸性条件下提供 10 mA cm ^-2的电流密度中，分别。进一步的研究证实，无定形 WO ₃包裹在结晶CoP周围，丰富的非晶-结晶异质结界面通过P 2p 的下移和Co 2p 轨道的上移直接优化了中间体的吸附能。此外，无定形WO ₃和结晶CoP之间的界面对于提高反应动力学至关重要，因为具有许多不饱和键的无定形相直接促进了反应物的吸附，而具有优异电导率的结晶CoP加速了电子的转移。该研究为构建用于制氢的结晶/非晶异质结催化剂提供了一种简便可行的方法。

更新日期：2022-09-15

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