Although extracting carbon atoms from carbides, as the reverse route to carbide derived carbon (CDC), may have more potentials for constructing advanced nanostructures, it has not been realized yet. As a proof of concept, in this work we realize the extraction of carbon atoms from carbide lattices by rationally controlling the reaction between carbides and Cl₂. Thus, a homologous metallic W layer adhered on a WC (W/WC) heterostructure is created. Based on experimental results, such a W/WC heterostructure can be used as an efficient catalyst for the photoelectrocatalytic hydrogen evolution reaction (HER), where the photocurrent density at 0 V can reach up to 16 mA cm⁻². Our theoretical calculations disclose that the Mott–Schottky effect accelerates electron flow across the interfaces and significantly decreases the work function of the W facet, which leads to excellent photoelectrocatalytic HER activity on the W facets. The presented results have broad implications since they demonstrate the generic capability to build homologous M/TMC heterostructures.

中文翻译：

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实现从WC中提取碳以有效形成光电化学氢并原位形成W / WC异质结构†

尽管从碳化物中提取碳原子作为与碳化物衍生的碳（CDC）的反向途径，可能具有更多的潜力来构建先进的纳米结构，但尚未实现。作为概念证明，在这项工作中，我们通过合理控制碳化物与Cl ₂之间的反应，实现了从碳化物晶格中提取碳原子。因此，产生了粘附在WC（W / WC）异质结构上的同源金属W层。根据实验结果，这种W / WC异质结构可以用作光催化氢放出反应（HER）的有效催化剂，其中0 V时的光电流密度可以达到16 mA cm ^-2。我们的理论计算表明，莫特-肖特基效应加速了电子在界面上的流动，并显着降低了W小平面的功函，从而导致W小平面具有出色的光电催化HER活性。提出的结果具有广泛的意义，因为它们证明了构建同源M / TMC异质结构的通用能力。